Használati útmutató SRS DS360

SRS generátor DS360

Olvassa el alább 📖 a magyar nyelvű használati útmutatót SRS DS360 (140 oldal) a generátor kategóriában. Ezt az útmutatót 7 ember találta hasznosnak és 2 felhasználó értékelte átlagosan 4.5 csillagra

Letöltés PDF

Oldal 1/140

DS360 Ultra Low Distortion Function Generator Revision 2.9 (09/2021)

Operating Manual and

Programming Reference

Model DS360

Ultra Low Distortion

Function Generator

1290-D Reamwood Avenue

Sunnyvale, CA 94089 U.S.A.

Phone: (408) 744-9040, Fax: (408) 744-9049

email: info@thinkSRS.com • www.thinkSRS.com

Certification

Stanford Research Systems certifies that this product met its published specifications at the time

of shipment. Stanford Research Systems further certifies that its calibration measurements are

traceable to the United States National Institute of Standards and Technology (NIST).

Warranty

This Stanford Research Systems product is warranted against defects in materials and

workmanship for a period of one (1) year from the date of shipment.

Service

For warranty service or repair, this product must be returned to a Stanford Research Systems

authorized service facility. Contact Stanford Research Systems or an authorized representative

before returning this product for repair.

Information in this document is subject to change without notice.

1999, 2007, 2008, 2011, 2012, 2013, 2016, 2018, 2020, 2021

Stanford Research Systems, Inc.

1290-D Reamwood Avenue

Sunnyvale, California 94089

Printed in USA

DS360 Ultra Low Distortion Function Generator

Safety and Preparation for Use

WARNING!

Dangerous voltages, capable of causing injury or death, are

present in this instrument. Use extreme caution whenever the

instrument is cover is removed. Do not remove the cover while

the unit is plugged in to a live outlet.

Caution

This instrument may be damaged if operated with the LINE VOLTAGE SELECTOR set

for the wrong AC line voltage, or if the wrong fuse is installed.

Line Voltage Selection

The DS360 operates from a 100, 120, 220 or 240 Vrms AC power source having a line

frequency of 50 or 60 Hz. Before connecting the power cord to a power source, verify

that the LINE VOLTAGE SELECTOR, located in the rear panel fuse holder, is set so

that the correct AC input voltage is visible.

Conversion to other AC input voltages requires a change in the fuse holder voltage card

position and fuse value. Disconnect the power cord, open the fuse holder cover door and

rotate the fuse-pull lever to remove the fuse. Remove the small printed circuit board and

select the appropriate operating voltage by orienting the printed circuit board so that the

desired voltage is visible when pushed firmly into its slot. Rotate the fuse-pull lever back

into its normal position and insert the correct fuse into the fuse holder.

Line Fuse

Verify that the correct fuse is installed before connecting the line cord. For 100/120

VAC, use two ½ Amp fuses and for 220/240 VAC use two ¼ Amp fuses.

Line Cord

The DS360 has a detachable, three-wire power cord for connection to the power source

and to a protective ground. The exposed metal parts of the instrument are connected to

the outlet ground to protect against electrical shock. Always use an outlet which has a

properly connected protective ground.

Power Switch

The power switch is located on the front panel of the unit, in the lower right hand corner.

Turn on the unit by pressing the switch in.

Fan

The fan in the DS360 is required to maintain proper operation. Do not block the vents in

the chassis or the unit may not operate properly.

DS360 Ultra Low Distortion Function Generator

Table of Contents iii

DS360 Ultra Low Distortion Function Generator

Table of Contents

Safety and Preparation For Use i

Table of Contents iii

Table of Figures v

Specifications vii

Abridged Command List xi

Chapter 1 Getting Started

Front Panel Operation 1-3

Continuous Waveforms 1-4

Frequency Sweeps 1-5

Tone Bursts 1-6

Chapter 2 Basics

Introduction 2-3

Front Panel Features 2-5

Rear Panel Features 2-12

Chapter 3 Operation

Power On 3-3

Setting Functions 3-4

Output Configuration 3-9

Modify Functions 3-11

Instrument Setup 3-18

Troubleshooting 3-21

Chapter 4 Programming

Index of Commands 4-2

Introduction 4-5

Command Syntax 4-8

Function Output Commands 4-9

Modify Function Commands 4-12

Setup Control Commands 4-15

Status Reporting Commands 4-16

Hardware Test and Calibration Commands 4-17

Status Byte Definition 4-19

Example Programs 4-21

Chapter 5 Testing

Getting Ready 5-3

Front Panel Test 5-7

Self Test 5-8

Frequency Test 5-9

Amplitude Test 5-10

Harmonic Distortion 5-13

Waveform Test 5-15

Sweep Test 5-17

Burst Test 5-18

iv Table of Contents

DS360 Ultra Low Distortion Function Generator

DC Offset Test 5-19

Output Impedance Test 5-21

DS360 Performance Test Record 5-23

Chapter 6 Circuitry

Overview 6-3

Digital Board Description 6-3

Analog Board Description 6-6

Front Panel Description 6-9

Programmable Resistor Board Description 6-9

Digital Board Parts List 6-11

Analog Board Parts List 6-15

Front Panel Parts List 6-27

Distortion Filter Parts List 6-31

Miscellaneous and Chassis Parts List 6-32

Digital Board Schematics DIG-1 to DIG-7

Analog Board Schematics ANA-1 to ANA-7

Front Panel Schematics FP-1 to FP-2

Programmable Resistor Board Schematics PROGR1

Table of Contents v

DS360 Ultra Low Distortion Function Generator

Table of Figures

Figure 2-1 Block Diagram 2-4

Figure 2-2 Front Panel 2-5

Figure 2-3 Keypad 2-6

Figure 2-4 Outputs 2-8

Figure 2-5 Indicators 2-9

Figure 2-6 Display 2-10

Figure 2-7 Rear Panel 2-12

Figure 2-8 Rear Outputs 2-13

Figure 5-1 Distortion Filter 5-5

vi Contents

DS360 Ultra Low Distortion Function Generator

Specifications vii

DS360 Ultra Low Distortion Function Generator

Specifications

Waveforms

Sine Frequency 0.01 Hz to 200.000 kHz

THD 1 VRMS Unbalanced, 2 VRMS Balanced

Frequency

Typical

Maxim

0.0

1 Hz

5.0 kHz

110 dB

106 dB

5.0 kHz

20.0 kHz

104 dB

20.0 kHz

40.0 kHz

100 dB

96 dB

40.0 kHz

100.0 kHz

90 dB

85 dB

100.0 kHz

200.0 kHz

76 dB

68 dB

THD 10 VRMS Unbalanced, 20 VRMS Balanced

Frequency

Typical

Max

imum

5.0 kHz

109 dB

105 dB

5.0 kHz

20.0 kHz

103 dB

20.0 kHz

40.0 kHz

98 dB

93 dB

40.0 kHz

100.0 kHz

88 dB

83 dB

100.0 kHz

200.0 kHz

76 dB

68 dB

Square Frequency 0.01 Hz to 200 kHz

Rise Time 1.3 s 

Even Harmonics <-60dBc (to 20 kHz)

White Noise Bandwidth DC to 200 kHz

Flatness < 1.0 dB pk-pk, 1 Hz to 100 kHz

Crest Factor 11 dB

Pink Noise Bandwidth 10 Hz to 200 kHz

Flatness < 3.0 dB pk-pk, 20 Hz - 20 kHz

(measured using 1/3 octave analysis)

Crest Factor 12 dB

Bandwidth Limited Noise Bandwidth 100 Hz, 200 Hz, 400 Hz, 800 Hz,

1.6 kHz, 3.2 kHz, 6.4 kHz, 12.8 kHz,

25.6 kHz, 51.2 kHz, 102.4 kHz

Center Frequency 0 Hz to 200.0 kHz, 200 Hz increments

Flatness (in band) < 1.0 dB pk-pk

Crest Factor Base Band (0 Hz Center Freq) 12 dB

Non Base Band 15 dB

Two-Tone Type Sine-Sine, Sine-Square

Sine Frequency 0.01 Hz to 200.000 kHz

Square Frequency 0.1 Hz to 5.0 kHz

Square Resolution 2 digits

SFDR >90 dB

viii Specifications

DS360 Ultra Low Distortion Function Generator

Sine or Square Burst ON Cycles 1/2, 1 to 65534 cycles

Repetition Rate 1 to 65535 cycles

Triggering Internal, External, Single, Externally Gated

OFF Level 0.0 % - 100.0 % (of ON Level)

OFF Resolution 0.1 %

Max OFF Attenuation 1 kHz -90 dBc

10 kHz -70 dBc

100 kHz -50 dBc

White or Pink Noise Bursts ON Time 10 s - 599.9s 

Repetition Time 20 s - 600s 

Triggering Internal, External, Single, Externally Gated

OFF Level 0.0% - 100.0% (of ON Level)

Resolution 0.1%

Sine or Square Sweeps Type Linear or Logarithmic

Range 0.01 Hz to 200.000 kHz

Rate 0.1 Hz to 3.1 kHz

Resolution 2 digits

Flatness 0.1 dB (1%) 

Frequency

Resolution (unless otherwise specified) 6 digits or 1 mHz, whichever is larger

Accuracy 25 ppm (0.0025%) + 4 mHz

from 20 to 40 C  

Amplitude

Unbalanced Output (+ output only)*

50 Load 5.0 Vpp - 14.4 Vpp  

600 Load 5.0 Vpp - 20.0 Vpp  

Hi-Z Load 10.0 Vpp - 40.0 Vpp 

Balanced Outputs

50 Load 10 Vpp - 28.8 Vpp  

150 Load 10 Vpp - 28.8 Vpp  

600 Load 10 Vpp - 40.0 Vpp  

Hi-Z Load 20 Vpp - 80.0 Vpp 

Resolution VPP or VRMS 4 digits or 1 V, whichever is greater 

dBm or dBV 0.1dB

Accuracy Sine, Square, 2-Tone 0.1 dB (1%) 

White Noise 0.175 dB (2%) 

Pink Noise 0.35 dB (4%) 

* - output amplitude is specified only in balanced mode.

Specifications ix

DS360 Ultra Low Distortion Function Generator

Noise

Broadband Noise (for a 1 kHz sine wave into a high impedance, at freq.> 1 kHz)

40 Vpp - 10 Vpp <500 nV Hz 

10 Vpp - 1.26 Vpp <100 nV Hz 

1.26 Vpp - 126 mVpp <15 nV Hz 

126 mVpp - 12.6 mVpp <7.5 nV Hz 

<12.6 mVpp <4 nV Hz 

(Note: 4 nV Hz is the measurement floor.) 

Offset

(specification for Offset Accuracy and Residual Offset applies to +Output only)

Unbalanced Output 50 Load 0 - 7.4 V  DC

600 Load 0 - 10.0 V  DC

Hi-Z Load 0 - 20.0 VDC

Balanced Output Not Active

Resolution 3 digits

Accuracy 1% of (Vpp/2+Offset) + Residual Offset

Residual Offset

(Sine, Square ≤ 120 KHz; White Noise & 2-Tone)

25 mV for Vpp/2+Offset > 0.63V

2.5 mV for 0.63V > Vpp/2+Offset > 0.063V

250 V for 63 mV > Vpp/2+Offset > 6.3 mV 

50 V for Vpp/2+Offset < 6.3 mV 

(all others)

300 mV for Vpp/2+Offset > 0.63V

20 mV for 0.63V > Vpp/2+Offset > 0.063V

2 mV for 63 mV > Vpp/2+Offset > 6.3 mV

200 V for Vpp/2+Offset < 6.3 mV 

Outputs

Configuration Balanced and Unbalanced

Connectors Floating BNCs, banana plugs and XLR Jack

Source Impedance Balanced 50 3%  

150 2%  

600 1%  

Hi-Z (50 3%)  

Unbalanced 50 3%  

600 1%  

Hi-Z (25 1 )   

Maximum Floating Voltage 40 VDC

x Specifications

DS360 Ultra Low Distortion Function Generator

Other Outputs

Sync TTL squarewave (same frequency and phase as output)

Burst Out TTL pulse marks burst (TTL high for ON time)

Trigger/Gate In TTL pulse starts sweep or burst. TTL hi activates gated burst.

Sweep TTL pulse marks beginning of sweep

General

Computer Interface GPIB and RS-232 standard. All instrument functions can be

controlled over the interfaces.

Size 17”W x 3.5”H x 16.25”D

Weight 17 lbs.

Warranty One year parts and labor on any defects in material or

workmanship.

Abridged Command List xi

DS360 Ultra Low Distortion Function Generator

Abridged Command List

Syntax

Commands which have a question mark in parentheses (?) after the mnemonic may be queried.

Commands that have a question mark without parentheses ‘? ‘ may be queried. Commands without a only

question mark be queried. Optional parameters are enclosed by {}. may not

Variables

i, j, k, n integers

x real numbers

Function Output Control Commands

FUNC (?) i

0=sin, 1=sqr, 2=wht noise, 3=pink noise, 4=2Tone.

FREQ (?) x

Set

Out

put Freq to x.

AMPL (?) x

Sets Ampl to x; must include VP, VR, dB, dV or dm.

OFFS (?) x

Sets Output Offset to x.

OUTE (?) i

Output Enable (i=1), Disable (i=0).

OUTM (?) i

Output Mode 0=unbal, 1=bal.

TERM (?) i 4-10

Source Impedanc

0=5



, 1=150



, 2=600



, 3=HiZ.

ELA (?) i

Sets Relative Amplitude Mode ON (i=1) or OFF (i=0).

STPE (?) i

Freq Step Enable (i=1) Disable (i=0).

FSTP (?) x

Sets Freq Step to x.

TTAA (?) x

Sets Tone A amp to x; must include VP, VR, dB

or dm.

TTBA (?) x

Sets

Tone B amp to x; must include VP, VR, dB, dV or dm.

TTAF (?) x

Sets Tone A frequency to x.

TTBF (?) x

Sets Tone B frequency to x.

TTMD (?) i

Sets 2

Tone Mode to sine (i=0) or square (i=1).

Modify Function Commands

*TRG

Triggers a si

ngle sweep or burst.

MENA (?) i

Modify Function Enable (i=1) or Disable (i=0).

MTYP (?) i 4-14 Sets the modify function type to Lin Swp, Log Swp, Burst, BWNoise

for i=0,1,2,3.

TSRC (?) i

Sets the trigger sourc

Int, Ext, Single or Gate for

i=0,1,2,3.

STFR (?) x

Sets Sweep Start Frequency to x.

SPFR (?) x

Sets Sweep Stop Frequency to x.

RATE (?) x

Sets Sweep Rate to x.

BCNT (?) x

Sets Burst Count to x (i=.5, 1

65534).

RCNT (?) i

Burst Rate to i (i=1

65535).

DPTH (?) x

Sets Burst Depth to x; must include DB or PR (%).

NBCT (?) x

Sets Noise Burst Count to x.

NRCT (?) x

Sets Noise Rate Count to x.

BNDW (?) x 4-16 Sets Noise BW to 100, 200, 400, 1.6k, 3.2k, 6.4k, 12.8k, 25.6k, 51.2k,

102.4k.

ENF (?) i

Sets BW Noise Center Frequency to i.

xii Abridged Command List

DS360 Ultra Low Distortion Function Generator

Setup Control Commands

*IDN?

Returns the DS360 device identification string.

*RCL i

Recalls stored setting number i (0 to 9).

*SAV i

Saves the current i

tru

ment setting as setting numbe

r i (1 to 9).

KEYS (?) i

Simulates the pressing of a front panel key.

Status Reporting Commands

*CLS

Clears all status registers.

*ESE (?) i

Sets/Reads the Standard Event Status Byte Enable register.

*ES

}

Reads the value of the

Standard Event Status register {or bit i only}.

*PSC (?) i

Sets the value of the power on status clear bit.

*SRE (?) i

Sets/Reads the Serial Poll Enable register.

*STB? {i}

Reads the value of the Serial

Byte {or bit i only}.

DENA (

?) i

Sets/Reads the value of the DDS enable register.

STAT? {i}

Reads the value of the DDS register {or bit i only}.

Hardware Test and Calibration Commands

*TST?

Starts self test and returns status when do

$FCL

Recalls the factory

calibration bytes.

$FIL (?) n

Sets the State variable Filter to the n

th filter.

$NOF (?) n

Sets the filter mode to n (0,1 or 2).

$PRE (?) n

Sets the DS360 pre

amplifier attenuators to range n (0 to 31).

$PS

T (?) n

Sets the DS360 p

ost

amplifier attenuators to range n (0 to3).

$WRD (?) j,k

Sets the value of calibration word j to k.

Getting Started 1-1

DS360 Ultra Low Distortion Function Generator

Chapter 1

Getting Started

These examples are designed to acquaint the first time user with the DS360 Ultra Low Distortion

Function Generator. The DS360 is a flexible generator, capable of producing continuous and modified

waveforms of exceptionally low noise and distortion, and high frequency accuracy and resolution. The

DS360 is also relatively easy to use; the following examples will lead you step-by-step through some

typical uses.

These examples require an oscilloscope to observe the output waveforms.

In this Chapter

Front Panel Operation 1-3

Keypad 1-3

Knob 1-3

Continuous Waveforms 1-4

Frequency Sweeps 1-5

Tone Bursts 1-6

1-2 Getting Started

DS360 Ultra Low Distortion Function Generator

Getting Started 1-3

DS360 Ultra Low Distortion Function Generator

Front Panel Operation

Parameters are set in the DS360 using the front panel keypad or the spin knob. Most parameters can be

set directly from the keypad, although it is often more convenient to use the spin knob. Keys are

referenced by brackets like this: [Key].

Keypad

Use the up and down arrow keys [∧], [∨] to change between functions. To set a

parameter, press the key with the desired parameter on it, ([FREQ] for example, to set

the frequency). The current value will be displayed. Most parameters are labeled on the

key itself; other parameters are labeled above the key in gray. To display these values,

first press the [SHIFT] key, then the desired key ([SHIFT] [TRIG SRC] to set the trigger

source). To change the value, press the appropriate numeric keys, followed by the correct

units key. If the value has no particular units, any of the units keys may be used. If an

error is made, press the [CLR] key to return to the current value. If the value entered is

outside the allowable limits the DS360 will beep and display an error message.

Knob

The spin knob can be used to modify most parameters. Display the current value as

described for the keypad and turn the knob to increment or decrement the parameter. The

decade that is being incremented (or decremented) will flash. To change the decade that

is being modified, use the left and right cursor keys [ ], [ < >].

Getting Started 1-4

DS360 Ultra Low Distortion Function Generator

Continuous Waveforms

This section discribes how to set up different continuous waveforms, like sinewaves, squarewave or

noise. Connect the PLUS (+) output to an oscilloscope to observe the waveforms.

1. Turn the unit on while holding down [CLR].

Wait until the power-on tests are completed.

When the power is turned on with the [CLR] key

depressed, the unit returns to its default settings.

This places the unit in a known state.

2. Press the [AMPL] [1][Vpp] key. Press .

Press the [FREQ] key. Press [2][kHz].

(Or turn the spin knob until the frequency reads

2.00 kHz)

Set the DS360 for a 1 Vpp, 2 kHz sinewave.

The oscilloscope should show a 2 kHz sinewave

with a 1 Vpp amplitude.

3. Press the left cursor [<] key several times until

the kHz position is flashing. Turn the spin knob

until the frequency reads 10.0000 kHz.

Press the function down [∨] key once.

Press the [OFFSET] key. Press [1][VDC].

Set the DS360 for a 1 Vpp, 10 kHz, squarewave.

The oscilloscope should show a 10 kHz, 1 Vpp

squarewave.

A 1 VDC offset should be added to the waveform.

4. Press the function down [∨] key once.

Press the [OFFSET] key. Press [0][VDC].

Press the [AMPL] key. Press [1][Vrms].

Set the DS360 for 1 Vrms white noise with no

offset.

The oscilloscope should show a noisy waveform of

about 7 Vpp.

Getting Started 1-5

DS360 Ultra Low Distortion Function Generator

Frequency Sweeps

This section discribes how to set up a linear or logarithmic frequency sweep. The DS360 can sweep the

output frequency of sine and square waves over any range of allowable frequencies. There are no

restrictions on minimum or maximum sweep span. The sweep rate may range from 0.1Hz (10 s) to

3.1kHz (0.32 ms). Sweeps can be triggered from the internal rate generator, an external rate, the front

panel or over the computer interface. The DS360 has a TTL sweep signal BNC on the rear panel that

marks the beginning of a sweep. Connect the SWEEP OUT BNC on the rear panel of the DS360 to the

second channel of the oscilloscope and set it to 2 V/div. The oscilloscope should be set to 0.2 ms/div and

to trigger on the rising edge of this signal.

1. Press [RCL][0].

This places the DS360 in its default state.

2. Press the modify function down [∨] key once.

Press the [ON/OFF] key in the MODIFY FUNC

area.

Set DS360 for a logarithmic, 1kHz sweep of a

sinewave.

The oscilloscope should show two periods of a 1

ms long log sweep.

3. Press the modify function up [∧] key once.

Press the [RATE][2][kHz] keys.

Press the [START][1][0][0][Hz] keys.

Press the [STOP][1][0][kHz] keys.

Set the DS360 for a 2kHz linear sweep, with a start

frequency of 100 Hz and a stop frequency of 10

kHz.

The oscilloscope should show 4 periods of a 0.5 ms

long linear sweep.

4. Press the function down [∨] key.

Change the output wave form to a square wave.

The oscilloscope should show the same frequency

sweep of a squarewave.

1-6 Getting Started

DS360 Ultra Low Distortion Function Generator

Tone Bursts

This section discribes how to set up tone bursts. The DS360 can produce a tone burst of between 1 and

65534 cycles of sine or square waves with a repetition rate of between 1 and 65535 cycles. It can also

produce bursts of noise. Bursts are generated by synchronously gating the output at zero crossings. The

“on” level of a burst may be any allowable output voltage; the “off” level can be set between 0 and 100%

of the “on” level in 0.1% increments. Bursts can be triggered from the internal rate generator, an external

rate, the front panel or over the computer interface. They can also be gated from an external source. The

DS360 has a TTL burst signal BNC on the rear panel that is high for the duration of the on level of a

burst and low otherwise. Connect the BURST OUT BNC on the rear panel of the DS360 to the second

channel of the oscilloscope and set it to 2 V/div. The oscilloscope should be set to 1 ms/div and to trigger

on the rising edge of this signal.

1. Press [RCL][0].

This places the DS360 in its default state.

2. Press the modify function down [∨] key twice.

Press the [RATE] key, then [8][units key].

Press the [SHIFT][RATE] [3][ keys, then units key]

Press the [SHIFT][DEPTH] keys, then [1][0][%].

Set the DS360 to generate a 3 cycle burst,

repeating every 8 cycles, with a 10% off level.

Any of the 4 units keys can be used.

3. Press the modify function [ON/OFF] key. The oscilloscope should show an 8 cycle burst,

with 3 on cycles and 5 off cycles at 10% of the

“on” level.

4. Press the [SHIFT][DEPTH] keys, then [0][%]. Set the DS360 to 0% “off” level.

Observe that the “off” level is now totally flat.

5. Press the [RATE] key, then [1][2][units key]. Observe that repetition rate is 12 cycles.

6. Press the [SHIFT][RATE] [5] keys, then

[units key].

Observe that the “on” time is now 5 cycles.

7. Press the [FREQ] [4][kHz]key, then key.

Observe that the frequency changed, however the

relative “on” and “off” times haven’t changed.

Basics 2-1

DS360 Ultra Low Distortion Function Generator

Chapter 2

Basics

In this Chapter

Introduction 2-3

Traditional Function Generators 2-3

DS360 Function Generator 2-3

Front Panel Features 2-5

Power Switch 2-5

Reset 2-5

Spin Knob 2-5

Keypad 2-6

Function Output 2-8

Auxiliary Outputs 2-8

Indicators 2-9

Display 2-11

Rear Panel Features 2-12

Power Entry Module 2-12

Auxiliary Outputs 2-13

Computer Interfaces 2-13

2-2 Basics

DS360 Ultra Low Distortion Function Generator

Basics 2-3

DS360 Ultra Low Distortion Function Generator

Introduction to Precision Waveform Synthesis

The DS360 uses Direct Digital Synthesis and analog signal processing to generate an extremely pure

sinewave with extraordinary frequency resolution and stability. Traditional function generators typically

use one of several methods to generate sinewaves, each having one or more major limitations.

Traditional Generators

Frequency synthesized function generators typically use a phase-locked loop (PLL) to

lock to a stable reference, and use wave shaping circuits to produce the desired function.

This solution often has limited frequency resolution. Typically frequency resolution is

limited to about 1:106 (some advanced PLL circuits have much higher resolution).

Distortion performance is limited due to the wave shaping circuits, often to as low as

-40dB.

Arbitrary function generators eliminate the need for wave-shaping circuitry. Normally a

PLL is used to create a variable clock that increments an address counter. This counter

addresses memory location in a waveform RAM that produces data for a DAC. This

waveform RAM can be filled with any data, to create “arbitrary” waveforms, as well as

sines, squares or other common waveforms. Since this is a sampled data system, it

requires an anti-imaging filter to create an accurate waveform. Sampling theory states

that a waveform can be accurately reproduced, as long as it is sampled more than twice

as fast as its highest frequency component. Since arbitrary function generators vary their

clock frequency, they must also modify their output anti-imaging filter.

Direct digital synthesis, a relatively new technique, overcomes many of these problems.

DDS works by generating addresses to a waveform RAM to produce data for a DAC.

Unlike PLL based techniques, the clock is a fixed frequency reference. Instead of using a

counter to generate addresses, an adder is used. On each clock cycle, the contents of a

Phase Increment Register is added to the contents of the Phase Accumulator. The output

of the Phase Accumulator is the address to the waveform RAM. By changing the value

of the Phase Increment, the number of cycles required to step through the entire

waveform RAM changes, thus changing the output frequency. Since a fixed frequency

clock is used, only one anti-imaging filter is required. This technique features excellent

frequency resolution, as good as 1:1014 and reasonable distortion performance, down to

-70dB.

Low distortion oscillators normally use some variety of R-C circuit in a Wein Bridge

configuration to generate a pure, low distortion sinewave. This solution suffers from

poor frequency accuracy, resolution and stability, due to component aging and drift.

Frequency stability and accuracy for these oscillators is normally measured in 100’s to

1000’s of PPM. Frequency resolution is typically between 0.1% to 1%. This technique

features excellent distortion performance, as low as -100 dB or better.

2-4 Basics

DS360 Ultra Low Distortion Function Generator

DDS with Advanced Signal Processing

A block diagram for the DS360 is shown in Figure 1. The DS360 utilizes direct digital

synthesis to generate its basic waveform. A Motorola DSP56002 advanced 24 bit digital

signal processor (DSP) acts as the phase accumulator and contains the internal waveform

RAM. The DSP chip gives the DS360 exceptional flexibility for generation of different

waveforms. A 32.333 MHz, 25 PPM crystal provides all clocking information for the

DS360, giving it exceptional frequency stability.

The DSP waveform RAM feeds an ultra low distortion 20 bit DAC, which is followed by

a 7th order Cauer anti-imaging filter to accurately reconstruct the sampled waveforms.

For sinewave generation, this is followed by a distortion reduction filter, that removes

nearly all of the remaining distortion components of the waveform. The output of this

filter passes through the fine amplitude control and to the low distortion balanced /

unbalanced power amplifier. The power amplifier is capable of generating a 40 Vpp

sinewave, with about -100dB of distortion in the unbalanced configuration and superior

performance at lower amplitudes. Finally the signal passes through output attenuators,

capable of 0, -20, -40 or -60 dB of attenuation.

Other waveforms follow slightly different paths. White noise skips the distortion

reduction filters, while pink noise adds the pink noise filter. Squarewaves and the

waveform sync signal are generated by discriminating the function with a high speed

comparitor. Burst signals are generated by passing any of the waveforms through the

burst DACs.

Power

Amplifier

Source

Resistors

Burst Level

Fine Amplitude

Control

Burst

Normal

Burst Control

Logic

Sine

Square

Distortion

Reduction

Filters

Sync

Comparator

Anti

Imaging

Filter

20 bit D/A

56002

DSP Chip

Main CPU

Display

Keys

Interfaces Course

Attenuators

Attenuator

Figure 2-1 DS360 Block Diagram

Basics 2-5

DS360 Ultra Low Distortion Function Generator

Front Panel Features

–

WHT NOISE

DIGITAL

BAL

UNBAL LIN SWP

SHIFT

ON/STBY

40V max.

DEPTH

TRIG SRC

BURST CNT

50 150 600

AMPL

FREQ

OFFST

ON/OFF

START

CENTER

SHIFT STO RCL CLR Vrms

Vpp/DC

dBm

kHz

dBV

REL

+/-

PINK NOISE

2-TONE

LOG SWP

BURST

BW NOISE

STOP

RATE

ON/OFF

–

COMMON

40 VDC MAX.

GROUND

Hz dB

kHz dBV

% dBm

REM SRQ

ACT ERR

STATUS FREQ AMPL

STP/BWSTR/C

Vp-p

Vrms

VDC

TRIGRCOUNT

OFFSET

OUTPUT

OFF

TRIG'D

IMPEDANCE

600

150

TRIGGER

INT

EXT

GATE

SINGLE

TTL

REL

TONE 2TONE1

RATE

SWP/BURST

FUNCTION

TRIGGER/GATE IN

SYNC OUT

OUTPUT

SECONDARY MODIFYENTRY

POWER

XLR OUTPUT BNC OUTPUT JACK OUTPUT

GPIB RS232

STANFORD RESEARCH SYSTEMS

SRS

MODEL DS360 ULTRA LOW DISTORTION FUNCTION GENERATOR

DEPTH

CAL SRQ

T2 MODE

LOCAL

HI Z

TRIGR

T1/T2

HI Z

DIG 1 DIG 2 DIG 3

F STEP F STEP ENA DIG FREQ # BITS

DIG 0

DIG MODE

DISP REL

Figure 2-2 Front Panel

Power Switch

The power for the DS360 is turned on by depressing the power button. After turning the

power on the LED display will display the units serial number for about 2 seconds,

perform the internal self tests and begin operation.

Caution

This instrument may be damaged if operated with the LINE VOLTAGE SELECTOR set

for the wrong AC line voltage or if the wrong fuse is installed.

Reset

Turn on the power while holding down the clear [CLR] key and continue to hold it for at

least 2 seconds to reset the unit. The unit will perform power on tests and assume the

default settings. Any stored settings will be lost.

Spin Knob

The spin knob is used to modify the parameter currently displayed on the DS360 display.

The flashing digit indicates which digit is being incremented. The knob will modify all

numeric parameters, as well as parameters which have a list of choices.

2-6 Basics

DS360 Ultra Low Distortion Function Generator

Keypad

Figure 2-3 Keypad

Function Keys

These keys control the main function output. The [∧] up and [ ] down function keys ∨

select between the main output functions. [FREQ], [AMPL] and [OFFST] select the

output frequency, amplitude and DC offset voltage. [ON/OFF] turns the output on and

off.

Output Selection Key

The [∨] key changes the output configuration from one of the three choices: unbalanced,

balanced and digital. Pressing the [∨] once moves one entry down the list; pressing the

[SHIFT](∧) moves one entry up the list.

Trigger Key

The [TRIGR] key begins singly triggered modified functions, like single sweeps or

bursts.

Modify Function Keys

These keys control the function output modification commands for sweeps, bursts or

bandwidth limited noise. The [∧] up arrow and [∨] down arrow keys select the

modification type. The [SWP/BURST] key turns the modification function on and off.

The other keys select different function modification parameters (start frequency, burst

depth).

Only modify functions that are allowable for the current function type (sine, square,

noise...) can be selected (i.e. sweep can be selected for sine or square, but not white

noise). Only modify parameters (START FREQ, STOP FREQ ...) that are valid for the

selected modify function can be changed. If a currently invalid modify parameter is

selected, the unit will beep and display “not APPL” (not applicable). If a function type

WHT NOISE

DIGITAL

BAL

UNBAL LIN SWP

SHIFT

DEPTH

TRIG SRC

BURST CNT

50 150 600

AMPL

FREQ

OFFST

ON/OFF

START

CENTER

SHIFT STO RCL CLR Vrms

Vpp/DC

dBm

kHz

dBV

REL

+/-

PINK NOISE

2-TONE

LOG SWP

BURST

BW NOISE

STOP

RATE

ON/OFF

SWP/BURST

FUNCTION

OUTPUT

SECONDARY MODIFYENTRY

GPIB RS232 CAL SRQ

T2 MODE

LOCAL

TRIGR

T1/T2

HI Z

DIG 1 DIG 2 DIG 3

F STEP F STEP ENA DIG FREQ # BITS

DIG 0

DIG MODE

DISP REL(SHIFT)

Basics 2-7

DS360 Ultra Low Distortion Function Generator

change causes the currently displayed modify function to become invalid, the display

will revert to the frequency [FREQ] display.

Shift Key

The [SHIFT] key is used to select functions printed above the keys. Press the [SHIFT]

followed by the [function] key to select the desired function. When the shift key is

pressed, the shift LED will light. This indicates that the keypad is in “shifted” mode.

Pressing [SHIFT] a second time will deactivate shift mode. Note that in the manual,

whenever [SHIFT] is indicated, the desired function is printed above the key, not on

the key itself.

Numeric Keys

The numeric keypad allows for direct entry of the DS360’s parameters. To change a

parameter value, type the new value, followed by one of the [units] keys. A typing error

may be corrected by pressing the [CLR] key, which recalls the old value. The [+/-] key

may be selected at any time during numeric entry.

Units Keys

The units are used to terminate numeric entries. Press the key with the desired units to

enter the typed value. Some parameters have no particular units and of the units keys any

may be used. When the amplitude is displayed, pressing one of the units keys will cause

the display to change the units to the type pressed. This means that the amplitude display

can changed from Vpp, Vrms, dBm and dBV without entering a new value.

Cursor Keys

The [>] cursor right and [<] cursor left keys move the flashing digit to the right and left

of the display. They also switch between parameters which have a list of choices.

Rel Key

The [REL] key changes the amplitude display to the relative display mode. The

amplitude is displayed in dB relative to the value when [REL] was pressed. Pressing

[REL] a second time changes the amplitude display back to normal. Pressing

[SHIFT][REL] shows the Vpp amplitude that the display is rel’d to.

2-8 Basics

DS360 Ultra Low Distortion Function Generator

Outputs

–

40V max.

–

COMMON

40 VDC MAX.

GROUND

TTL

TRIGGER/GATE IN

SYNC OUTXLR OUTPUT

BNC OUTPUT JACK OUTPUT

Figure 2-4 Outputs

Function Output

The three output types are connected in parallel. There are three separate sets of output

connectors: BNC, XLR and banana plugs. The different output signals are the positive

output, negative output, common and chassis ground. The connectors are configured as

listed below.

Function Output Connections

Output Signal BNC Connection XLR Connection Banana Plug

Positive Output + BNC Center contact Pin 2 + (red) jack

Negative Output - BNC Center contact Pin 3 - (white) jack

Common Both BNC Shields Pin 1 Common (black) jack

Ground Pin 4 Ground (green) jack

The positive and negative outputs are both referenced to the common, which may be

floated +/-40 VDC from the chassis ground. The output impedance of the outputs is

selectable. If the output is terminated into an incorrect impedance the output amplitude

will be incorrect and may exhibit increased distortion.

Sync Output BNC

This output is a squarewave synchronized to the main function output. Its shield is

connected to chassis ground and cannot be floated.

Trigger / Gate In BNC

A low to high TTL signal on this input begins externally triggered bursts and sweeps.

For gated output, a TTL high gates the output on and a TTL low gates the output off. The

BNC shield is connected to chassis ground and cannot be floated.

Basics 2-9

DS360 Ultra Low Distortion Function Generator

Indicators

REM SRQ

ACT ERR

STATUS FREQ AMPL

STP/BWSTR/C

TRIGRCOUNT

OFFSET

OUTPUT

OFF

TRIG'D

IMPEDANCE

600

150

TRIGGER

INT

EXT

GATE

SINGLE

REL

TONE 2TONE1

RATE

DEPTH

HI Z

Figure 2-5 Indicator LED’s

Status LEDs

These 4 LEDs indicate the DS360’s status.

Status LEDs

Name Function

REM The DS360 is in GPIB remote status. The [>] cursor right key returns local control.

SRQ The DS360 has requested service on the GPIB.

ACT Flashes for RS232 or GPIB activity.

ERR Flashes on error in a command.

Configuration LEDs

These LEDs indicate the output configuration, source impedance and triggering mode of

the DS360.

Configuration LEDs

Heading Display LED Parameter

OUTPUT ON

OFF

TRIG’ D

Output On

Output Off

Sweep or Burst Triggered

IMPEDANCE 50

150

600

Hi-Z

50 Ω Output Impedance

150 Ω Output Impedance

600 Ω Output Impedance

Hi-Z Output Impedance

TRIGGER INT

EXT

SINGLE

GATE

Internal Trigger for Sweeps or bursts

External Trigger for Sweeps or Bursts

Single Trigger for Sweeps or Bursts

External Gate for Bursts only

2-10 Basics

DS360 Ultra Low Distortion Function Generator

Parameter LEDs

These LEDs indicate which parameter is currently displayed in the parameter display.

Parameter LEDs

Display LED Parameter

FREQ Output Frequency

AMPL Output Amplitude

OFFSET Output Offset

STARTF Start Frequency for Sweeps

Center Frequency for Bandwidth Limited Noise

STOPF Stop Frequency for Sweeps

Cutoff Frequency for Bandwidth Limited Noise

REL Indicates that the amplitude display is in REL mode. Does not indicate a specific

display.

TONE1 Indicates that Amplitude and Frequency Displays refer to TONE 1. Does not

indicate a specific display.

TONE2 Indicates that Amplitude and Frequency Displays refer to TONE 2. Does not

indicate a specific display.

DEPTH Off Level Depth for Bursts

COUNT Burst Count for Bursts

TRIGR Trigger Source for Sweeps and Bursts

RATE Burst Rate for Bursts

Basics 2-11

DS360 Ultra Low Distortion Function Generator

Display

Hz dB

kHz dBV

% dBm

Vp-p

Vrms

VDC

Figure 2-6 Display

Parameter Display

This 8 digit display shows the value of the currently displayed parameter. Error, status

messages and configuration information may also appear on the display.

Units LEDs

These LEDs indicate the units of the displayed value. If no LED is lit the number

displayed has no units or is seconds (for noise bursts).

Units LEDs

Display LED Meaning

Hz Hertz

dB dB relative to preset value

VP-P Volts Peak-to-Peak

kHz Kilohertz

dBV dB relative to 1 VRMS into selected source impedance

VDC Volts DC

% % (used with BURST DEPTH)

dBm dB relative to 1mW into selected source impedance

Vrms V RMS

2-12 Basics

DS360 Ultra Low Distortion Function Generator

Rear Panel Features

FUSE

PULL

RS232 (DCE)

SWEEP OUT BURST TRIG OUT

IEEE-488 STD PORT

CHASSIS

GROUND

No user serviceable parts inside. Refer to user

manual for safety notice. Service by qualified

personnel only.

SRS

STANFORD RESEARCH SYSTEMS

MODEL DS360 ULTRA LOW DISTORTION

FUNCTION GENERATOR. MADE IN U.S.A.

DIGITAL OUTPUT

LINE : 48-66 Hz

FUSE :

1/2 A @ 100/120V

1/4 A @ 220/240V

!WARNING

Verify that the LINE VOLTAGE SELECTOR card is set so the correct AC

input voltage value is visible. For continued protection against fire hazard

USE CORRECT FUSE.

!WARNING

COAX OPTICAL

AES/EBU

SPDIF

Figure 2-7 Rear Panel

Power Entry Module

The power entry module is used to fuse the AC line, select the line voltage and block

high frequency noise from entering or exiting the instrument. The DS360 uses a

detachable three wire power cord for connection to the power source and the protective

ground. All exposed metal parts of the unit are tied to the outlet ground to protect against

electrical shock. Always use an outlet which has a properly connected protective ground.

Caution

This instrument may be damaged if operated with the LINE VOLTAGE SELECTOR set

to the wrong AC line voltage, or if the wrong fuse is installed.

Do not attempt to service or adjust this instrument while it is plugged into a live outlet.

Line Voltage Selection

The DS360 operates from a 100, 120, 220 or 240 VRMS nominal AC power source

having a line frequency of 50 or 60 Hz. Before connecting the power cord to a power

source, verify that the LINE VOLTAGE SELECTOR card, located in the rear panel fuse

holder, is set so the correct AC input voltage is visible.

Conversion to other AC sources requires a change in the fuseholder voltage card position

and fuse value. Disconnect the power cord, open the fuse holder and rotate the fuse lever

to remove the fuse. Remove the small printed circuit board and select the operating

voltage by orienting it so the correct voltage is visible when pushed back into its slot.

Rotate the fuse-pull lever back to its normal position and insert the correct fuse into the

holder.

Line Fuse

Verify that the correct fuse is installed before connecting the line cord. For 100/120

VRMS use two ½ amp fuses. For 220/240 VRMS use two 1/4 amp fuses.

Basics 2-13

DS360 Ultra Low Distortion Function Generator

Outputs and Computer Interface

Figure 2-8 Outputs & Computer Interfaces

IEEE-488 Connector

The 24 pin IEEE-488 connector allows a host computer to control the DS360 via the

IEEE-488 (GPIB) instrument bus. The GPIB address of the unit is accessed by pressing

[SHIFT][GPIB]. The [>] cursor right key is the instrument “local” key.

Serial RS232 Connector

The RS232 interface connector is configured as a DCE (transmit on pin 3, receive on pin

2). The Baud Rate is accessed by pressing [SHIFT][RS232]. The interface parameters

are: word length 8 bits, no parity and 2 stop bits.

Sweep Out

This output generates a short TTL pulse at the beginning of each sweep. It can be used to

synchronize an external device to a sweep. Its shield is connected to chassis ground and

cannot be floated.

Burst Out

This TTL output goes high for the “ON” portion of a burst and low for the “OFF”

portion. It can be used to synchronize an external device to a burst. Its shield is

connected to chassis ground and cannot be floated.

2-14 Basics

DS360 Ultra Low Distortion Function Generator

Operation 3-1

DS360 Ultra Low Distortion Function Generator

Chapter 3

Operation

The following sections describe the operation of the DS360. The first section describes the basics of

setting a function, including setting the function type, amplitude, frequency and offset. The second

section explains setting the output configuration, including the output type and source impedance. The

third section explains sweeps, bursts and bandwidth limited noise. The final section explains storing and

recalling setups, running self tests and setting up the computer interfaces.

In this Chapter

Power On 3-3

Caution 3-3

Reset 3-3

Setting Functions 3-4

Function Type 3-4

Frequency 3-4

Amplitude 3-5

Unbalanced Amplitude Ranges 3-6

Balanced Amplitude Ranges 3-7

Offset 3-8

Function On/Off 3-8

Output Configuration

3-9

Output Type 3-9

Source Impedance 3-10

Modify Function 3-11

Modify Function Type 3-11

Modify Function On/Off 3-11

Modify Function Parameters 3-11

Sweeps 3-11

Bursts 3-13

Bandwidth Limited Noise 3-16

Instrument Setup 3-18

Default Settings 3-18

Storing and Recalling Settings 3-18

GPIB Setup 3-19

SRQ 3-19

RS-232 Setup 3-19

Self Tests 3-20

3-2 Operation

DS360 Ultra Low Distortion Function Generator

Troubleshooting 3-21

GPIB Problems 3-21

RS232 Problems 3-21

Error Messages 3-22

Operational Messages 3-23

Operation 3-3

DS360 Ultra Low Distortion Function Generator

Power On

When power is first applied to the DS360 the unit will display its serial number and

ROM version. Next the DS360 will initiate a series of self-tests of the internal circuitry

and stored data. The test should take about 3 seconds and end with the message “TEST

PASS”. If the self-test fails the DS360 will display an error message indicating the

nature of the fault (see the TROUBLESHOOTING section at the end of this chapter for

more details). The unit will attempt to operate normally after a self test failure; press any

key to clear the error message.

Caution

This instrument may be damaged if operated with the LINE VOLTAGE SELECTOR set

for the wrong AC line voltage or if the wrong fuse is installed.

Reset

Turn the power on while holding down the [CLR] key and continue to hold it down for at

least 1 second to reset the unit. The unit will perform its self-tests and assume its default

settings.

Attention

The DS360 has two distinct modes: analog and digital. These are selected as described in

the output configuration section. When the unit is in one mode (digital or analog),

parameters of the other mode cannot be selected or quarried from either the front panel

or the computer interface. This chapter describes the operation of the analog mode; for

information on the digital mode, see Chapter 5.

3-4 Operation

DS360 Ultra Low Distortion Function Generator

Setting Functions

The following section describes how to set the parameters for the basic functions of the DS360, including

function type, frequency, amplitude, offset and function on/off.

Function Type

The DS360 output function type is selected using the [∧] up and [ ] down function ∨

arrow keys. Press the appropriate key until the desired function LED is lit. The peak-to-

peak amplitude will remain the same between different functions. If the amplitude is

displayed in any other units, they will be adjusted to reflect a constant peak-to-peak

voltage. If the modify function is enabled and the type is incompatible with the new

function, the modify function will be changed to a legal value (the parameters will

remain unchanged).

The available functions are sinewaves, squarewaves, white noise, pink noise and two-

tones. Sinewaves and squarewaves are self explanatory. White Noise is a Gaussian

weighted distribution, filtered to 200 kHz and is flat in amplitude over that region. Pink

Noise extends from 10 Hz to 200 kHz with a -3 dB/octave amplitude response. There are

two types of 2-Tones; sine-sine 2-tones and sine-square 2-tones. To display the current

mode, press [SHIFT][T2 MODE]. To change modes, press the [>] right or [<] cursor

key, or turn the spin knob. When in 2-Tone, only one set of parameters (amplitude,

frequency) are available at a time. To toggle between displaying Tone 1 and Tone 2

parameters, press [SHIFT][T1/T2].

Frequency

To display the current output frequency, press the [FREQ] key. The frequency is

displayed in Hz or kHz, depending on which unit LED is lit. The DS360 has 6 digits of

frequency resolution or 10 mHz, whichever is greater. Any non displayed digits are

zeroed to avoid having slightly different output frequencies for a given display value.

The frequency ranges and resolution are shown in the table below.

Frequency Range of Functions

Function Frequency Range Frequency Resolution

Sinewaves 0.01 Hz - 200.000 kHz 0.01 Hz or 6 digits

Squarewaves 0.01 Hz - 200.000 kHz 0.01 Hz or 6 digits

White Noise 200 kHz White Noise (fixed)

Pink Noise 200 kHz Pink Noise (fixed)

Sine-Sine Two-Tone

Tone1 & Tone2

0.01 Hz - 200.000 kHz

0.01 Hz or 6 digits

Sine-Square Two-Tone

Tone1 (Sine)

Tone2 (Square)

0.01 Hz - 200.000 kHz

0.1 Hz - 5.0 kHz

0.01 Hz or 6 digits

2 digits

Operation 3-5

DS360 Ultra Low Distortion Function Generator

If the function is set to White Noise or Pink Noise the character of the noise is fixed,

unless a modification function is active. The frequency is not adjustable and displays

“noise”.

The frequency of both Tone1 and Tone 2 may be set. For Sine-Sine 2-Tones, both

frequencies are set the same as for normal sines, as is Tone1 for Sine-Square 2-Tones.

The squarewave in sine-square two-tones has limited frequency range and resolution. It

can be set from 0.1 Hz to 5.0 kHz with 2 digits of resolution (i.e. 4.9 kHz or 110 Hz, not

104 Hz).

To set the frequency of a function, type the new value on the keypad and complete the

entry with the appropriate units (Hz, kHz). Or change the frequency by using the spin

knob. If too high a value is entered, the DS360 will beep and display “Range Err”. If a

value less than 0.01 Hz is entered, the frequency is set to 0.001 Hz.

For output frequency settings only, the spin knob increment can set to a value other than

the normal single digit increment (set by the [>] right and [<] left cursor keys). To

display the step size mode, press [SHIFT][FSTEP ENA]. To toggle between the normal

and the special step size mode, turn the spin knob or press either of the cursor keys. To

display the current special step size, press the [SHIFT] [F STEP] keys. To set the special

step size, type a new value and complete the entry with the appropriate units (Hz, kHz).

The spin knob cannot be used to enter the step size.

Amplitude

To display the current amplitude, press the [AMPL] key. The amplitude may be set and

displayed in Vpp, Vrms, dBm, dBV and dB from a relative value. The current units are

indicated by the LEDs at the right of the display. dBm is defined as dB relative to 1 mW

of power into the selected source impedance. dBV is defined as dB relative to 1 Vrms

into the selected source impedance. (See the section on setting impedance and output

configuration for more detail).The amplitude resolution is 4 digits or 1 µV, whichever is

greater for Vpp and Vrms. For dBm, dB and dBV it is 3 digits or 0.1 dB, whichever is

greater.

The units of the amplitude display may be changed between Vpp, Vrms, dBm and dBV

without changing the amplitude by pressing the corresponding units key. When the

DS360 is switched from one function to another, the peak-to-peak amplitude remains the

same, but the values for other units will change to reflect the new function. To change

the amplitude, type a new value on the keypad, followed by the appropriate units (Vrms,

Vpp, dBm, dBV) key. Or use the spin knob to modify the current value. If the DS360s

attenuator setting changes, the output will briefly go to zero as the amplitude is changed.

2-Tone Amplitude

The amplitudes of Tone1 and Tone2 are maintained separately from the other function

amplitudes (i.e. when changing from another function to 2-Tone, the amplitudes will be

the last 2-Tone amplitudes set, not the value of the previous function). In addition to the

amplitude limits shown below, the amplitudes of Tone1 and Tone2 cannot differ by more

than 1:1000 or:

3-6 Operation

DS360 Ultra Low Distortion Function Generator

0 001

000. ≤ ≤

AmpTone

If the amplitude of either Tone1 or Tone 2 is set outside of these limits, the unit will

beep, display the message “Adj 2tA” (adjusting 2Tone Amplitude) and modify the other

Tone amplitude so it is within the allowable range.

Relative Amplitude

Amplitude may be set in dB relative to a user defined value for all functions except 2-

Tone. To make the currently displayed value the relative value, press [REL]. To set the

value in dB (relative to the previously entered rel’d value), type the new value, followed

by the [dB] key. The “rel’d” value can be displayed in Vrms, dBm or dBV, without

changing the amplitude, by pressing the appropriate key. To display the “rel’d” value in

Vpp, press [SHIFT][REL] which will display the Vpp value briefly. Pressing the [REL]

key a second time takes the amplitude out of relative mode, as does entering a value in

Vrms, dBm or dBV.

Unbalanced Output Amplitude

The amplitude range is limited by the DC offset, since

(VAC PEAK) + |VDC| ≤ 20 V |VDC| ≤ (200 * VAC PEAK)

For a DC offset of zero, the amplitude range for each function is shown in the tables

below for different source impedance’s.

Unbalanced Hi-Z Output Amplitude Ranges

Function Vpp Vrms dBm dBV

Sine 10 V - 40.00 V 4 V - 14.14 V µ µ -108 - 23.0

Square 10 V - 40.00 V 5 V - 20.00 V µ µ -106 - 26.0

White Noise # 10 µ µV - 40.00 V 1 V - 5.714 V -119 - 13.1

Pink Noise # 10 µ µV - 40.00 V 2 V - 5.000 V -120 - 11.5

2-Tone * 10 V - 40.00 V 3 V - 14.14 V µ µ -108 - 23.0

Unbalanced 50 Ω

ΩΩ

Ω Output Amplitude Ranges

Function Vpp Vrms dBm dBV

Sine 5 V - 14.40 V 2 V - 5.091 V µ µ -102 - 27.1 -115 - 14.1

Square 5 V - 14.40 V 3 V - 7.200 V µ µ -102 - 27.1 -112 - 17.1

White Noise # 5 µ µV - 14.40 V 1 V - 2.057 V -102 - 27.1 -125 - 4.2

Pink Noise # 5 µ µV - 14.40 V 1 V - 1.800 V -102 - 27.1 -126 - 2.7

2-Tone * 5 V - 14.40 V 2 V - 5.091 V µ µ -102 - 27.1 -115 - 14.1

Operation 3-7

DS360 Ultra Low Distortion Function Generator

Unbalanced 600 Ω

ΩΩ

Ω Output Amplitude Ranges

Function Vpp Vrms dBm dBV

Sine 5 V - 20.00 V 2 V - 7.071 V µ µ -112 - 19.2 -115 - 17.0

Square 5 V - 20.00 V 3 V - 10.00 V µ µ -112 - 19.2 -112 - 20.0

White Noise # 5 µ µV - 20.00 V 1 V - 2.857 V -112 - 19.2 -125 - 7.0

Pink Noise # 5 µ µV - 20.00 V 1 V - 2.500 V -112 - 19.2 -126 - 5.5

2-Tone * 5 V - 20.00 V 2 V - 7.071 V µ µ -112 -19.2 -115 - 17.0

Balanced Output Amplitude

Since there is no offset allowed for balanced output, the amplitude is only limited:

VAC PEAK ≤ 40 V

The amplitude range for each function is shown in the tables below for different source

impedance’s.

Balanced Hi-Z Output Amplitude Ranges

Function Vpp Vrms dBm dBV

Sine 20 V - 80.00 V 8 V - 28.28 V µ µ -103 - 29.0

Square 20 V - 80.00 V 10 V - 40.00 V µ µ -100 - 32.0

White Noise # 20 µ µV - 80.00 V 3 V - 11.43 V -113 - 19.1

Pink Noise # 20 µ µV - 80.00 V 3 V - 10.00 V -114 - 17.6

2-Tone * 20 V - 80.00 V 8 V - 28.28 V µ µ -103 - 29.0

Balanced 50 Ω

ΩΩ

Ω Ω and 150 ΩΩ

Ω Output Amplitude Ranges

Function Vpp Vrms dBm dBV

Sine 10 V - 28.80 V 4 V - 10.18 V µ µ -96 - 33.2 -109 - 20.2

Square 10 V - 28.80 V 6 V - 14.40 V µ µ -96 - 33.2 -106 - 23.2

White Noise # 10 µ µV - 28.80 V 2 V - 4.114 V -96 - 33.2 -119 - 10.2

Pink Noise # 10 µ µV - 28.80 V 2 V - 3.600 V -96 - 33.2 -120 - 8.70

2-Tone * 10 V - 28.80 V 4 V - 10.18 V µ µ -96 - 33.2 -109 - 20.2

Balanced 600 Ω

ΩΩ

Ω Output Amplitude Ranges

Function Vpp Vrms dBm dBV

Sine 10 V - 40.00 V 4 V - 14.14 V µ µ -106 - 25.2 -109 - 23.0

Square 10 V - 40.00 V 6 V - 20.00 V µ µ -106 - 25.2 -106 - 26.0

White Noise # 10 µ µV - 40.00 V 2 V - 5.714 V -106 - 25.2 -119 - 13.1

Pink Noise # 10 µ µV - 40.00 V 2 V - 5.000 V -106 - 25.2 -120 - 11.5

2-Tone * 10 V - 40.00 V 4 V - 14.14 V µ µ -106 - 25.2 -109 - 23.0

* The maximum amplitude for 2-Tones is based on the sum of the two signals. Additionally the

difference between the two signals is limited to 1000:1 (i.e. the smaller of the two can be no smaller

than 1000x less than the larger).

3-8 Operation

DS360 Ultra Low Distortion Function Generator

* The rms, dBm and dBV values for White & Pink Noise are based on the total power in the output

bandwidth (200 kHz) at a given peak-to-peak setting.

Offset

Press the [OFFST] key to display the DC offset. The DC offset range is limited by the

amplitude, since

|VAC PEAK| + |VDC| ≤ 20 V |Voffset| ≤ (200 * VAC PEAK).

The offset has three digits of resolution, however the smallest increment is determined

by the sum of the peak AC amplitude and the DC offset. The tables below show the

offset range and resolution for given amplitude settings. Offset is not active for balanced

outputs and is the same polarity for both unbalanced outputs (a +2 V

DC offset sets both

the positive and negative offsets to +2 V) for unbalanced outputs.

Unbalanced Hi-Z

|VAC PEAK| + |VDC| Offset Resolution (VDC)

0 to 12.59 mV 10 µV

12.60 mV to 125.9 mV 100 µV

126.0 mV to 1.259 V 1 mV

1.260 V to 20.00 V 10 mV

Unbalanced 50 Ω

ΩΩ

Ω

|VAC PEAK| + |VDC| Offset Resolution (VDC)

0 to 6.319 mV 10 µV

6.320 mV to 63.19 mV 100 µV

63.2 mV to 0.6319 V 1 mV

0.6320 V to 7.200 V 10 mV

Unbalanced 600 Ω

ΩΩ

Ω

|VAC PEAK| + |VDC| Offset Resolution (VDC)

0 to 6.319 mV 10 µV

6.320 mV to 63.19 mV 100 µV

63.20 mV to 0.6319 V 1 mV

0.6320 V to 10.00 V 10 mV

To set a new offset, type the desired value on the keypad, followed by the [V

DC] key. Or

use the spin knob to modify the currently displayed offset value.

Function On / Off

The output may be switched on or off by pressing the [ON/OFF] key. The output status

is indicated on the main display under the OUTPUT heading. When the output is off, the

output connectors are terminated into the select source impedance.

Operation 3-9

DS360 Ultra Low Distortion Function Generator

Output Configuration

This section describes how to configure the output type and source impedance of the DS360.

Output Type

The DS360 has two different output types: unbalanced and balanced. The currently

selected output type is indicated by the LED in the OUTPUT section. To change to the

other output selection, press [∨] output down key. The significance of the different

output types is listed below.

Unbalanced Output

An unbalanced output signal refers to a signal that is referenced to a common DC

potential. Peak-to-peak or RMS voltages are measured to that common level. Most

normal function generators use this configuration. Both the positive and negative outputs

of the DS360 have the selected source impedance and output voltage amplitude present.

The two signals are equivalent, the only difference being that the positive signal is 180°

out of phase with the negative signal.

When the unbalanced output is selected, the amplitude limits are set to the unbalanced

output values. The offset function is available. Offsets are the same polarity for both

outputs (a +2 VDC offset will offset both the positive and negative outputs by 2 volts).

Balanced Output

A balanced output signal refers to a signal that is measured to another signal, not a

common DC potential, although one may be present. Peak-to-Peak or RMS voltages are

measured from signal to signal instead of signal to common. This configuration is used

for many audio applications. Typically the measured voltage will be twice the voltage (or

+6 dB) from each signal to a common signal. The output voltage and source impedance

is measured between the positive and negative outputs on the DS360. The signals are the

same as for the unbalanced case (albeit a different amplitude), however their amplitude is

measured differently.

When the balanced output is selected, the amplitude limits are set to the balanced output

values. The offset function is not active, since offset has no meaning for a balanced

output.

Source Impedance

The source impedance of the DS360 can be set to different values. When the output of

the DS360 is terminated into the selected source impedance, the amplitude set on the

front panel will be the amplitude seen by the load. If the output is not terminated into the

selected load, the amplitude set on the front panel will be incorrect. If one of the source

impedance’s is selected (not Hi-Z), and the unit is terminated into a high impedance, the

amplitude will be double the set value. The Hi-Z should be used when the output is

terminated into a high impedance. The Hi-Z amplitude will be correct (<1% error) for all

load impedance’s larger than 5 kΩ.

3-10 Operation

DS360 Ultra Low Distortion Function Generator

The output impedance changes for unbalanced and balanced. Each output (positive and

negative) has the selected source impedance for unbalanced outputs. For balanced

outputs, each output has 1/2 the selected source impedance.

Source Impedance for + or - Output

Source Impedance Unbalanced Balanced

50 Ω 50Ω 25Ω

150 Ω 75 Ω

600 Ω 600Ω 300Ω

Hi-Z 25 Ω 25Ω

The selected source impedance is displayed under the IMPEDANCE heading to the left

of the display. To change the impedance, press [SHIFT][impedance], where impedance

is either 50Ω Ω Ω, 150 , 600 or Hi-Z. It is not necessary to press an entry key to select

source impedance’s.

If changing the source impedance from Hi-Z or 600Ω to 50Ω or 150 would cause an Ω

out of range amplitude or offset, the following will occur. The DS360 will beep, display

the message Adj volt and adjust the amplitude to 14.4V

PP and the offset to 0 VDC.

Operation 3-11

DS360 Ultra Low Distortion Function Generator

Modify Function

This section describes how to set the modify functions on the DS360, including sweeps, bursts and

bandwidth limited noise.

Modify Function Type

Modify functions are associated with the different output functions. Only the options

available for the currently selected function type are accessible in the MODIFY FUNC

list. Sweeps are available for sine and square waves; bursts are available for sines,

squares, white and pink noise; bandwidth limited noise is available for white noise only.

No modify functions are active for 2-Tones. Press the [∧] up or [∨] down keys in the

MODIFY FUNC area until the desired selection is lit. If you cannot select the desired

type of modify function, verify that the selected function type allows that modify

function type.

Modify Function On/Off

To activate or deactivate the currently selected modification, press the [ON/OFF] key in

the MODIFY FUNC area. The SWP/BURST LED is lit to indicate that the

modification function is active.

Modify Function Parameters

The parameters for modify functions can be entered whether the function is currently

active or not. Only modify parameters (START FREQ, STOP FREQ ...) that are valid for

the selected modify function can be changed. If a currently invalid modify parameter is

selected, the unit will beep and display “not APPL” (not applicable). If a function type

change causes the currently displayed modify function to become invalid, the display

will revert to the frequency display.

Sweeps

Frequency sweeps are active for sine and square waves. Sweeps are increasing in

frequency and can be linear or logarithmic in nature. Frequency changes during the

sweep are phase continuous, including the wrap around from stop to start frequency. The

rate can be set from 0.1 Hz to 3.1 kHz, with 2 digits of resolution. Sweeps can be

continuous, externally triggered or singly triggered. The DS360 has a Sweep output on

the rear panel that can be used to synchronize an oscilloscope or other external device to

the DS360 sweep output. Use the MODIFY FUNC [ON/OFF] key to begin or end

sweeping.

Note

Sweeps have an amplitude rise at the wrap around point (stop frequency to start

frequency transition) due to ringing in the reconstruction filter. The effect is minimal for

stop frequencies below about 130 kHz. If high stop frequencies and large output

amplitudes (>30 Vpp, unbalanced) are used, it is possible to cause the output to clip. To

3-12 Operation

DS360 Ultra Low Distortion Function Generator

minimize this, keep stop frequencies below 130 kHz when sweeping at maximum

amplitude.

Sweep Type

Press the [∧] up or [∨] down key in the MODIFY FUNC area until the LIN SWP or

LOG SWP LED is lit. The output frequency of a linear sweep changes linearly during

the sweep time. The output frequency of a log sweep changes exponentially during the

sweep time, spending equal time in each decade of frequency (for example, in a log

sweep from 1 kHz to 100 kHz, the sweep will spend half of the time in the 1 kHz to 10

kHz range and the other half in the 10 kHz to 100 kHz range).

Sweep Trigger Source

Sweeps can be continuously triggered, externally triggered or singly triggered. Internally

triggered sweeps use an internal sweep rate generator (see the SWEEP RATE described

below) to set the sweep repetition rate. Externally triggered sweeps begin on the rising

edge of a TTL signal supplied by the user to the TRIGGER/GATE IN BNC on the front

panel. Singly triggered sweeps begin by pressing the front panel [TRIGR] key or from

one of the computer interfaces.

The current trigger source is indicated by an LED under the TRIGGER heading next to

the frequency display. To view the current trigger source for modification, press the

[SHIFT][TRIG SRC] keys. To change the trigger source, use the spin knob or [>] right

or [<] left cursor keys.

While the DS360 is sweeping, the TRIG’D (triggered) LED is lit. It should be lit

continuously for internally triggered sweeps. For external or single triggered sweeps, it

will be lit for the duration of the sweep only. If a new trigger is received during an

external or single triggered sweep including the specified dead time (see SWEEP RATE

for details on dead time), the ERR LED will flash and any triggers will be ignored.

Sweep Rate

The sweep rate can be set continuously from 0.1 Hz (10 s) to 3.1 kHz ( 0.32 ms) with 2

digits of resolution (for example, you can set 1.1 kHz, but not 101 Hz). The period of a

sweep is simply 1/Sweep Rate.

To display the current sweep rate, press the [RATE] key. To change the sweep rate, type

a new value on the numeric keypad, followed by the appropriate units (Hz or kHz). Or

use the spin knob to modify the current value. If a non-valid rate is entered, (1.001 kHz

for example) the DS360 will round the value down to the nearest legal value. If an out of

range value is entered, the DS360 will beep, display “Rate Err” and flash the ERR LED.

Internal Trigger

There are no additional restrictions on internal sweep rates.

External or Single Trigger

The DS360 synchronizes the external (or single) trigger signal to its internal clock.

Because of this, there is an uncertainty of between 0 and 0.317 ms from the start signal

Operation 3-13

DS360 Ultra Low Distortion Function Generator

(from the TRIGGER IN, computer interface or front panel) and the actual beginning of

the sweep. The SWEEP OUT BNC signal, which goes high at the beginning of the

sweep, should be used if it is necessary to synchronize the DS360 with an external

device, instead of the triggering signal. In addition, there is a dead time of between 0 and

0.317 ms between successive sweeps. If a trigger comes during a sweep or during the

dead time following a sweep, it will be treated as an error and ignored. These factors

limit the maximum rate that a sweep can be triggered externally (or singly) to somewhat

less than for internally triggered sweeps. To never miss a trigger, the maximum external

(or single) trigger rate is given by: 1/(Ext Sweep Freq) = 1/(Sweep Rate) + 0.634 ms.

Sweeps can be triggered somewhat faster than this if it is permissible to skip triggers.

Trigger errors simply indicate that a trigger has been ignored, but do not effect the output

signal in any way.

Start and Stop Frequencies

The DS360 can sweep over any portion of its frequency range, from 0.001 Hz to 200.000

kHz. To display the current start or stop frequency, press the [START] or [STOP] key.

To change the start or stop frequency, type a new value using the numeric keypad,

followed by the appropriate units (Hz or kHz). If an out of range frequency is entered,

the DS360 will beep, display “FREQ Err” and flash the ERR LED.

Bursts

Bursts are active for sinewaves, squarewaves, white noise and pink noise. A burst of

sines or squares consists of a certain number of complete cycles at a particular level (the

“ON” level), followed by another number of cycles at a reduced level (the “OFF” level).

Time intervals (instead of number of cycles) are used for noise signals. This pattern can

be triggered, either internally, externally, or on a single-shot basis. Additionally the

output can be gated on and off by an external signal.

Bursts are programmed in # of counts for sine and square waves and in seconds for noise

signals. The “ON” time is entered as the Burst Count. The Burst Rate is the combination

of both the “ON” and “OFF” times as shown below.

BURST RATE = BURST COUNT + OFF CYCLES

The burst “OFF” level is set in percent or dB relative to the “ON” level and can range

from 0 to 100% in 0.1% increments or from 0dB to -60dB in 0.1dB increments. The

DS360 has a BURST output on the rear panel that can be used to synchronize an

oscilloscope or other external device to the DS360 burst output. This signal remains a

TTL high for the duration of the “ON” time and a TTL low for the “OFF” time. Use the

MODIFY FUNC [ON/OFF] key to begin or end bursting.

Burst Trigger Source

Bursts can be continuously triggered, externally triggered or singly triggered. Internally

triggered bursts use an internal burst rate generator (see the BURST RATE described

below) to set the repetition rate. Externally triggered bursts begin on the rising edge of a

TTL signal supplied by the user to the TRIGGER/GATE IN BNC on the front panel.

Singly triggered bursts begin by pressing the front panel [TRIGR] key or from one of the

3-14 Operation

DS360 Ultra Low Distortion Function Generator

computer interfaces. In addition, the output can be gated on and off from the

TRIGGER/GATE IN BNC, with TTL high setting the “ON” level and TTL low setting

the “OFF” level.

The current trigger source is indicated by an LED under the TRIGGER heading next to

the display. To view the current trigger source for modification, press the [SHIFT][TRIG

SRC] keys. To change the trigger source, use the spin knob or [>] right or [<] left cursor

keys.

During the “ON” time for bursts the TRIG’D (triggered) LED is lit. If a new trigger is

received during an external or single triggered burst the ERR LED will flash. Any

triggers received during an external or single triggered burst will be ignored. Trigger

errors only indicate that a trigger occurred during a burst; there is no effect on the output

waveform.

Sine and Square Wave Bursts

Internal Burst Rate

The burst rate is the total number of cycles in a burst, both the “ON” and “OFF” cycles,

when generating internally triggered bursts. It is set in integer number of cycles and can

range from 2 to 65535 (1 for the 1/2 cycle output. See below). In addition, it must be at

least one count greater than the Burst Count. To display the current burst rate, press the

[RATE] key. To modify the rate, type the new value in number of counts and press any

of the entry keys. Or use the spin knob to modify the displayed value. If an illegal value

is entered, the unit will beep, display “Range Er” and flash the ERR LED. If a value

that is less than the current burst count is entered, the unit will beep, flash the ERR LED,

display “AdjBur” (adjust burst), and adjust the Burst Count to one less than the Burst

Rate.

External Burst Rate

External or single triggered sine or square bursts are synchronized to the output zero

crossings. Because of this, there is an uncertainty of 0 to one cycle from the start signal

(from the TRIGGER IN, computer interface or front panel) and the actual beginning of

the burst. The BURST OUT BNC signal, which goes high at the beginning of the burst

should be used if it is necessary to synchronize the DS360 with an external device,

instead of the triggering signal. This limits the maximum rate that a burst can be

triggered externally (or singly) to somewhat less than for internally triggered bursts. To

never miss a trigger, the maximum external (or single) trigger rate is given by:

ExtTrigFreq

utputFreq

BurstCount

Bursts can be triggered somewhat faster than this if it is permissible to skip triggers.

Burst Count

The burst count is the number of “ON” cycles (or high level) in a burst. It is set in

integer number of cycles and can range from 1 to 65534. In addition it must be at least

one count less than the Count Rate. To display the current Burst Count, press the

[SHIFT][BURST CNT]. To modify the count, type the new value in number of counts

and press any of the entry keys. Or use the spin knob to modify the displayed value. If an

illegal value is entered, the unit will beep, display “Range Er” and flash the ERR LED.

Operation 3-15

DS360 Ultra Low Distortion Function Generator

If a value that is greater than or equal to the current burst rate is entered the unit will

beep, display “BurRatEr” ( burst rate error) and flash the ERR LED.

Noise Bursts

Internal Burst Rate

The burst rate for noise is set in seconds. Any entry key may be used and no units are

displayed. The rate can vary between 20 µs to 600.0 s, with 4 digits of resolution. In

addition, the rate must be greater than and within 4 digits of the Burst Count. To display

the current burst rate, press [RATE]. To modify the rate, type the new value (in seconds)

and press any entry key. Or use the spin knob to modify the displayed value. If an illegal

value is entered, the unit will beep, display “Range ER” and flash the ERR LED. If a

value less than the current burst count is entered, the unit will beep, flash the ERR LED,

display “AdjBur” and adjust the Burst Count to 1/10 of the current Burst Rate. If the

Burst Rate is adjusted to a value more than 4 digits above the current Burst Count, the

Burst Rate is adjusted to the lowest allowable value (i.e. if the initial Burst Count is

0.001s, setting the Burst Rate to 600s will adjust the Burst Count to 0.1s).

External Bursts Rate

External noise bursts are not synchronized to anything, so there isn’t the uncertainty

from the TRIGGER IN signal and the start of bursts that there is for sine or square

waves. To never miss a trigger, the maximum external (or single) trigger rate is given

by:

ExtTrigFreq BurstCount

when the burst count is expressed in seconds.

Burst Count

The burst count for noise is the “ON” time in a noise burst. Any entry key can be used

and no units are displayed. The burst count can vary between 10 µs to 599.9 s, with 4

digits of resolution. In addition, the burst count must be less than and within 4 orders of

magnitude of the Burst Rate. To display the current burst count, press [SHIFT][BURST

CNT]. To modify the count, type the new value (in seconds) and press any entry key. Or

use the spin knob to modify the displayed value. If an illegal value or a value greater than

or equal the current burst rate is entered, the unit will beep, display “Range Er” and

flash the ERR LED.

Burst Depth

The burst depth is the attenuation of the “OFF” level compared to the “ON” level. To

enter a specific “OFF” level it is necessary to enter an “ON” level and calculate the

required attenuation to generate the desired “OFF” level. The burst depth on the DS360

can vary from 0 to 100%, with a 0.1% resolution. It can also be displayed or entered in

dB. 0% depth (no output) can only be set in percent. If 0% is set and the units are

changed to dB, the display will show as an overflow value since it cannot be “-999”

displayed in dB.

To view the current depth, press [SHIFT][DEPTH]. To change the depth, type the new

value followed by the appropriate units key (% or dB). Or use the spin knob to modify

3-16 Operation

DS360 Ultra Low Distortion Function Generator

the current value. If an out of range value is entered, the unit will beep, display “Depth

Err” and flash the ERR LED.

Gated Output

When the DS360 is set to gated output mode (see Burst Trigger Source) the output is

gated on and off from the TRIGGER/GATE IN BNC. A TTL high level outputs the

“ON” level and TTL low the “OFF” level. For sine and square waves, level changing

occurs at zero crossings. Because of this there is an uncertainty of between 0 and one

cycle from the rising edge of the TRIGGER/GATE IN BNC and the actual level change

of the output. Similarly there is an uncertainty at the falling edge. The BURST OUT

BNC signal, which is high while the “ON” level is active should be used if it is necessary

to synchronize the DS360 with an external device instead of the external gating signal.

This is not a problem for gated noise signals, since it isn’t synchronized to anything.

1/2 Cycle Burst

The DS360 has a special mode where it can output a 1/2 cycle burst of a sine or square

waves. The polarity is fixed (positive for the positive output; negative for the negative

output). To use the 1/2 cycle burst count, type .5, followed by an entry key. The spin

knob cannot be used to enter this value. The burst rate can be set to any legal value and

all triggering modes are valid.

Bandwidth Limited Noise

Bandwidth limited noise is active for white noise only. The purpose of bandwidth limited

noise is to maximize the noise power in the frequency of interest. The bandwidth limited

white noise in the DS360 maintains a constant RMS voltage over nearly all bandwidths

and center frequencies (see information in the CENTER FREQUENCY section below

for more information). The bandwidth limiting is accomplished using a 3-Pole

Butterworth Filter, for both the high and low pass filters. Use the MODIFY FUNC

[ON/OFF] key to begin or end bandwidth limited noise.

Bandwidth

The Bandwidth of the bandwidth limited noise can be set to any of the following values:

100 Hz, 200 Hz, 400 Hz, 800 Hz, 1.60 kHz, 3.20 kHz, 6.40 kHz, 12.8 kHz, 25.6 kHz,

51.2 kHz or 102.4 kHz. These correspond to 1/2 bandwidth frequency spans, starting

from the full bandwidth of the white noise.

To display the current bandwidth, press the [BW] key. To enter a new value, type the

value followed by the appropriate units key (Hz or kHz). Or use spin knob to modify the

current value. If the bandwidth is not entered exactly, the DS360 will round down to the

next legal value for all values above 100 Hz; below 100 Hz will round to 100 Hz. If an

out of range value is entered, the DS360 will beep, display “Freq Err” and flash the ERR

LED.

Operation 3-17

DS360 Ultra Low Distortion Function Generator

Center Frequency

The center frequency can vary from 0 Hz to 200.000 kHz in 200 Hz increments. To

display the current center frequency, press the [CENTER] key. To change the center

frequency, type a new value using the numeric keypad, followed by the appropriate units

(Hz or kHz). If an out of range frequency is entered, the DS360 will beep, display “Freq

Err” and flash the ERR LED.

For bandwidth limited noise with high center frequencies and/or wide bandwidths there

can potentially be a reduction in noise power. When

CENTER FREQUENCY + 1/2 BANDWIDTH > 200 kHz

the amplitude will be slightly reduced. This is due to the fact that the white noise

generator has a bandwidth of 200 kHz, so any part of the noise bandwidth above 200 kHz

will be filtered.

3-18 Operation

DS360 Ultra Low Distortion Function Generator

Instrument Setup

This section describes the DS360’s default settings, storing and recalling settings, setting the computer

interfaces and running the self-tests.

Default Settings

Press [RCL][0] to recall the DS360’s default settings. This is a good place to begin

whenever you wish to start the instrument from a known state. The default settings are

listed below. See Chapter 5 for information on the default settings for the digital output.

Default Settings

Setting Default Value

Function Sine

Frequency 1.00000 kHz

Amplitude 1.000 Vrms

Offset 0.00 VDC

Output On/Off On

Output Type Unbalanced

Output Mode Analog

Output Impedance Hi-Z

Modify Function Linear Sweep

Modify Function On/Off Off

Start Frequency 1.000 Hz

Stop Frequency 100.000 kHz

Sweep Rate 1.0 kHz

Trigger Source Internal

Burst Depth 50%

Burst Count 1

Burst Rate 10

2-Tone Tone 1 Frequency 1.00000 kHz

2-Tone Tone 2 Frequency 10.0000 kHz

2-Tone Tone 1 Amplitude 1 Vrms

2-Tone Tone2 Amplitude 1 Vrms

2-Tone Mode Sine-Sine

Bandwidth Limited Noise Center Frequency 0 Hz

Bandwidth Limited Noise Bandwidth 3.2 kHz

GPIB Address As set

RS-232 Baud Rate As set

Storing and Recalling Settings

Storing Settings

The DS360 can store up to 9 independent instrument setups in non-volatile RAM,

separate from the default settings ([RCL][0]). To store the current instrument setup, press

[STO] followed by a location number (1-9). After any of the units keys are pressed, the

Operation 3-19

DS360 Ultra Low Distortion Function Generator

message “Store Done” will be displayed to indicate that the settings have been stored.

Memory location 0 is the location of the defaults and cannot be stored to. Storing to it

will generate a range error.

Recalling Settings

To recall a stored setting, press [RCL] followed by a location number (0-9). After

pressing any of the units keys to enter the location, the message “Rcl Done” will be

displayed to indicate that the settings have been recalled. If nothing had been stored in

the selected location or if the stored settings had been corrupted, the message “Rcl Err”

will be displayed. Note that [RCL][0] recalls the default settings.

GPIB Setup

Press [SHIFT][GPIB] to display the current GPIB address. Use the spin knob to modify

the address or enter the number directly from the keypad and one of the entry keys. The

GPIB address can be set from 0 to 30.

Pressing [SHIFT][GPIB] a second time will display the last 256 characters of data that

has been received by the DS360. This display is a scrollable 3 character window into the

DS360’s input data queue. The data is displayed in ASCII hex format, where each

character is represented by 2 hexadecimal digits. The most recently received character is

indicated by the decimal point to the right of the digit. Turning the spin knob to the left

moves the window earlier into the data queue; turning it to the right moves later into the

queue. The display window cannot be moved later than the last character received.

SRQ

The user may issue an user SRQ (service request) over the GPIB. Only one SRQ (user or

otherwise) can be active at a time; the host computer must acknowledge any pending

SRQ’s before a new one is sent. Note that the user SRQ is in addition to the usual service

requests based on the unit’s status.

To issue an user SRQ, press [SHIFT][SRQ], followed by any of the entry keys. The

message “Send SRQ” will appear prior to pressing the entry key. After the entry key is

pressed (assuming that no other SRQ is pending), the message” “Sent SRQ” will appear,

and the SRQ LED will appear. The SRQ LED will go off after the host computer does a

serial poll of the DS360.

See Chapter 4 on programming for additional information on the GPIB.

RS-232 Setup

Press [SHIFT][RS232] to display the RS-232 baud rate setting. Use the spin knob to

modify the baud rate. The baud rate cannot be entered directly from the keypad. Baud

rates supported are 300, 600, 1200, 2400, 4800, 9600 and 19.2 k.

Pressing [SHIFT][RS232] a second time will display the last 256 characters of data that

has been received by the DS360. This display is a scrollable 3 character window into the

3-20 Operation

DS360 Ultra Low Distortion Function Generator

DS360’s input data queue. The data is displayed in ASCII hex format, where each

character is represented by 2 hexadecimal digits. The most recently received character is

indicated by the decimal point to the right of the digit. Turning the spin knob to the left

moves the window earlier into the data queue; turning it to the right moves later into the

queue. The display window cannot be moved later than the last character received.

See Chapter 4 on programming for additional information on the RS-232.

Self-Tests

The self tests check out much of the internal circuitry, including the CPU, data memory,

ROM program memory, calibration constants integrity, stored settings integrity, DSP and

DSP memory. The self tests are executed on power-up and take about 3 seconds to run. If

all the self tests pass, the unit will display “tESt PASS” and operate normally. If they

fail, the unit will stop and display an error message. Pressing any key will cause the unit

to attempt to operate normally. Typically the user should power cycle the instrument to

attempt to clear the error. Some errors are transient in nature and will disappear. If the

problems continue, contact Stanford Research Systems for service information.

See the TROUBLESHOOTING section later in this chapter for a list and explanation of

error messages.

Operation 3-21

DS360 Ultra Low Distortion Function Generator

Troubleshooting

Nothing Happens on Power On

Make sure that the power entry module on the rear panel is set for the correct line

voltage, that the correct fuse is installed and that the line cord is inserted all the way into

the power entry module. The selected line voltage should be visible through the clear

window in the power entry module, just below the fuse, when the power cord is

removed.

Reset

If the unit becomes “hung” or inoperative, or displays no sensible message, a full reset

may fix the problem. To perform a full reset, hold down the [CLR] key while turning the

power on. This procedure initializes the RAM and recalls all factory calibration values. It

also distroys any stored settings. If you only want to return the instrument to it’s default

state, press [RCL][0], which doesn’t clear all stored data.

Unable to Set Parameters

Be certain that the unit is set for the correct mode (analog or digital) for the parameters

being adjusted (i.e. number of bits cannot be set in analog mode). This is true for both

front panel and computer operation. The output mode is indicated by the LED’s in the

OUTPUT section.

GPIB Problems

Make certain that the GPIB address of the DS360 matches what the controller expects.

The address can set to any address from 0 to 30, however the default address is 8. If

possible it is a good idea to use this address, unless you are otherwise constrained. To

display the address, press [GPIB], and use the keypad or spin knob to modify it.

The DS360 will ignore its front panel keypad when Remote Enable (REN) is asserted by

the GPIB. This “REMOTE” state is indicated by the REM LED. To return to LOCAL

operation (ie to return control to the front panel) press the key. Controlling [LOCAL]

programs may inhibit the ability to return to LOCAL operation by asserting the Local-

Lockout state (LLO). The only way to return from this state is to release it over the GPIB

or by performing a total reset.

A linefeed character is sent with an End Or Identify (EOI), to terminate strings from the

DS360. Be certain that your controller has been configured to accept this sequence.

RS-232 Problems

Make certain that the baud rate of the controller and the DS360 agree. The baud rate can

be set from 300 to 19.2 k; the default is 9600. If it is practical, it is a good idea to use this

value. To display the baud rate press [RS232], and use the keypad or knob to modify the

3-22 Operation

DS360 Ultra Low Distortion Function Generator

value.The DS360 is configured to send or receive: 2 stop bits, 8 data bits and no parity

bits.When data is being recieved by the DS360, the ACT LED will flash. If this LED is

not flashing there is no data being recieved by the DS360.

When connecting the DS360 to a PC use a standard PC serial cable, not a “null modem”

cable. The DS360 is a DCE (Data Communications Equipment) device, and should be

connected with a straight cable to a DTE device (Data Terminal Equipment). The

“minimum” cable needs pins 2, 3 and 7. For hardware handshaking, pins 5 and 20 (CTS

and DTR) should also be passed. Occasionally pins 6 and 8 (DSR and CD) will be

needed; these lines are always asserted by the DS360.

Error Messages

The DS360 has two types of error messages, operational error messages and self test

error messages. Operational errors include entering out of range values or incorrect units.

Self test error messages only occur when the unit is running its internal self tests.

Operational Errors

Message Meaning

AC-DC ER The Vac+|Vdc| value exceeded the limit for the current setting.

AC ERR The amplitude entered is out of the allowable range.

BUR.RAT.ER Burst Rate Error. Burst Count > Rate Count.

NO.Cal.JPR No Cal jumper. Calbyte cannot be written without setting the calibration jumper.

NOT APPL The parameter is not applicable to the current instrument setting.

OFF ERR The offset entered is out of the allowable range.

OUTQ ERR Output queue error. The output queue is full.

RANGE ER The value entered is out of the allowed range for the current parameter.

RCL ERR Memory error found on power up or when recalling a stored setting. (Also

occurs when recalling a setting that hasn’t been previously stored)

SYN ERR The command syntax is invalid.

TOUT ERR Time out error when writing DSP memory.

UNITS ER The units set with AMPL, T1AA, T2BA or DPTH commands are not allowable

or nonexistent.

Operation 3-23

DS360 Ultra Low Distortion Function Generator

Self-Test Errors

Message Meaning

CPU ERR The DS360 detected a problem with the CPU.

CODE ERR XX The DS360 detected a ROM checksum error. XX is the expected checksum

value.

SYSD ERR The DS360 failed its RAM read / write test.

CALD ERR The calibration data in RAM is corrupted. The factory calibration data will be

reloaded from PROM.

DSP 0 DSP not responding. The instrument must be power cycled.

DSP 1

followed by: xxxxxx

DSP data bus error. The message is followed by a six digit (hex) code,

corresonding to each data line (of 24) that is in error.

DSP 2

followed by: xxxxxx

DSP address bus and memory cell error. The message is followed by a six digit

(hex) code, made up of three words.

Bits 0-15 are DSP address lines 0-15.

Bits 16-18 are set if there is an error on the X, Y or P memory spaces.

Bits 19-21 are set if there is an error in the low (D0-7), middle (D8-15) or high

(D16-23) bytes of the memory space.

TST n This message displays an encoded version of the bits 0-3 of the test register (see

the *TST command).

Other Messages

The DS360 displays a number of messages to inform the user of its operational status or

of actions the unit has taken. All possible messages are listed below.

Operational Messages

Message Meaning

ADDR xx GPIB address. The value xx is the current GPIB address.

ADJ BUR The Burst count has been adjusted to be lower then the current Rate count.

ADJ DFR The digital output frequency has been adjusted to an allowable range after

changing the sampling frequency.

ADJ VOLT The amplitude and offset has been adjusted to an allowable value after changing

the source impedance.

ADJ 2TA The non-selected 2Tone amplitude has been adjusted to within a 1:1000 range of

the currently selected tone.

ADJ 2TAll Tone 1 and Tone 2 amplitudes and offset have been adjusted to an allowable

value after changing the source impedance.

ADJ 2TFR Tone 2 Frequency has been adjusted after the Tone 2 mode was changed to

squarewave.

BAUD xxxx RS232 baud rate. The value xxxx is the current baud rate.

CLEAR Second selection of the CAL menu. If the calibration jumper is set correctly,

pressing any unit key will recall the default calbytes from PROM.

3-24 Operation

DS360 Ultra Low Distortion Function Generator

LD DONE This message occurs after succesfully loading the DSP memory.

RECALL Recall menu. It should be followed by a number between 0-9.

RCL DONE This message will be displayed for about 1 second after a succesfull recall.

STORE Store menu. Should be followed by a number between 1-9. (Store 0 will generate

a Range Error).

STO DONE This message will be displayed for about 1 second after a succesfull store.

SEND SRQ SRQ menu. Pressing any units key will generate a GPIB SRQ, assuming no other

SRQ is pending.

SRQ SENT This message is displayed for about 1 second after a SRQ is successfully sent.

SRC.INT

SRC.ETN

SRC.SNGL

SRC.GATE

The Trigger Source for sweeps (int, ext, single) or bursts (int, ext, single, gate).

STEP OFF (/ON) Frequency Step Enable. (Valid for FREQ and 2Tone FREQ).

Remote Programming 4-1

DS360 Ultra Low Distortion Function Generator

Chapter 4

Remote Programming

In this Chapter

Index of Commands 4-2

Introduction 4-5

Communication with GPIB 4-5

Communication with RS-232 4-5

Status Indicators and Queues 4-5

Command Format 4-6

Interface Ready and Status 4-6

GET (Group Execute Trigger) 4-7

Command Syntax 4-8

Function Output Control Commands 4-9

Function 4-9

Frequency 4-9

Amplitude 4-9

Offset 4-9

Output Commands 4-9

Relative Mode 4-10

Frequency Step 4-10

2-Tone Commands 4-10

Modify Function Commands 4-12

Trigger 4-12

Modify Function 4-12

Trigger Source 4-12

Sweep Commands 4-12

Burst Commands 4-13

Bandwidth Limited Noise Commands 4-14

Setup Control Commands 4-15

System Commands 4-15

Front Panel Commands 4-15

4-2 Remote Programming

DS360 Ultra Low Distortion Function Generator

Status Reporting Commands 4-16

Hardware Test & Calibration Commands 4-17

Status Byte Definition 4-19

Example Programs 4-21

GPIB Communications in C 4-22

RS-232 Communications in BASIC 4-23

Remote Programming 4-3

DS360 Ultra Low Distortion Function Generator

Index of Commands

Variables

i, j, k, n integers

x real numbers

Function Output Control Commands

FUNC (?) i 4-9 0=sin, 1=sqr, 2=wht noise, 3=pink noise, 4=2Tone.

FREQ (?) x 4-9 Sets Output Freq to x.

AMPL (?) x 4-9 Sets Ampl to x; must include VP, VR, dB, dV or dm.

OFFS (?) x 4-9 Sets Output Offset to x.

OUTE (?) i 4-9 Output Enable (i=1), Disable (i=0).

OUTM (?) i 4-9 Output Mode 0=unbal, 1=bal.

TERM (?) i 4-10 Source Impedance 0=50Ω, 1=150 , 2=600 , 3=HiZ. Ω Ω

RELA (?) i 4-10 Sets Relative Amplitude Mode ON (i=1) or OFF (i=0).

STPE (?) i 4-10 Freq Step Enable (i=1) Disable (i=0).

FSTP (?) x 4-10 Sets Freq Step to x.

TTAA (?) x 4-10 Sets Tone A amp to x; must include VP, VR, dB, dV or dm.

TTBA (?) x 4-11 Sets Tone B amp to x; must include VP, VR, dB, dV or dm.

TTAF (?) x 4-11 Sets Tone A frequency to x.

TTBF (?) x 4-11 Sets Tone B frequency to x.

TTMD (?) i 4-11 Sets 2-Tone Mode to sine (i=0) or square (i=1).

Modify Function Commands

*TRG 4-14 Triggers a single sweep or burst.

MENA (?) i 4-14 Modify Function Enable (i=1) or Disable (i=0).

MTYP (?) i 4-14 Sets the modify function type to Lin Swp, Log Swp, Burst, BWNoise

for i=0,1,2,3.

TSRC (?) i 4-14 Sets the trigger source to Int, Ext, Single or Gate for i=0,1,2,3.

STFR (?) x 4-14 Sets Sweep Start Frequency to x.

SPFR (?) x 4-14 Sets Sweep Stop Frequency to x.

RATE (?) x 4-14 Sets Sweep Rate to x.

BCNT (?) x 4-15 Sets Burst Count to x (i=.5, 1-65534).

RCNT (?) i 4-15 Sets Burst Rate to x (i=1-65535).

DPTH (?) x 4-15 Sets Burst Depth to x; must include DB or PR (%).

NBCT (?) x 4-15 Sets Noise Burst Count to x.

NRCT (?) x 4-15 Sets Noise Rate Count to x.

BNDW (?) x 4-16 Sets Noise BW to 100, 200, 400, 1.6k, 3.2k, 6.4k, 12.8k, 25.6k, 51.2k,

102.4k.

CENF (?) i 4-16 Sets BW Noise Center Frequency to x.

4-4 Remote Programming

DS360 Ultra Low Distortion Function Generator

Setup Control Commands

*IDN? 4-17 Returns the DS360 device identification string.

*RCL i 4-17 Recalls stored setting number i (0 to 9).

*SAV i 4-17 Saves the current instrument setting as setting number i (1 to 9).

KEYS (?) i 4-17 Simulates the pressing of a front pannel key.

Status Reporting Commands

*CLS 4-18 Clears all status registers.

*ESE (?) i 4-18 Sets/Reads the Standard Event Status Byte Enable register.

*ESR? {i} 4-18 Reads the value of the Standard Event Status register {or bit i only}.

*PSC (?) i 4-18 Sets the value of the power on status clear bit.

*SRE (?) i 4-18 Sets/Reads the Serial Poll Enable register.

*STB? {i} 4-18 Reads the value of the Serial Poll Byte {or bit i only}.

DENA (?) i 4-18 Sets/Reads the value of the DDS enable register.

STAT? {i} 4-18 Reads the value of the DDS register {or bit i only}.

Hardware Test and Calibration Commands

*TST? 4-19 Starts self test and returns status when done.

$FCL 4-19 Recalls the factory calibration bytes.

$FIL (?) n 4-19 Sets the State variable Filter to the n-th filter.

$NOF (?) n 4-19 Sets the filter mode to n (0,1 or 2).

$PRE (?) n 4-19 Sets the DS360 pre-amplifier attenuators to range n (0 to 31).

$PST (?) n 4-20 Sets the DS360 post-amplifier attenuators to range n (0 to3).

$WRD (?) j,k 4-20 Sets the value of calibration word j to k.

Remote Programming 4-5

DS360 Ultra Low Distortion Function Generator

Introduction

The DS360 Ultra Low Distortion Function Generator may be remotely programmed via

either the RS232 or GPIB (IEEE-488) interfaces. Any computer supporting these

interfaces may be used to program the DS360. Both interfaces are receiving at all times;

the DS360 will respond to the interface that sent the query.

Communicating with GPIB

The DS360 supports the IEEE-488.1 (1978) interface standard. It also supports the

required common commands of the IEEE-488.2 (1987) standard. Before attempting to

communicate with the DS360 over the GPIB interface, the DS360’s device address must

be set. To display the present address, press [SHIFT][GPIB]. The new address can be

modified by using the keypad, followed by an entry key, or by using the spin knob.

Communicating with RS232

The DS360 is configured as a DCE (transmit on pin 3, receive on pin 2) device and

supports CTS/DTR hardware handshaking. The CTS signal (pin 5) is an output indicating

that the DS360 is ready, while the DTR signal (pin 20) is an input that is used to control

the DS360’s data transmission. If desired, the handshaking pins can be ignored and a

simple 3 wire interface (pins 2, 3 and 7) may be used. The RS232 baud rate is displayed

by pressing [SHIFT][RS232]. A new baud rate can be entered using the spin knob only;

the baud rate cannot be entered using the numeric keys. The word length, parity and

number of stop bits are fixed and cannot be modified. They are configured as follows: 2

stop bits, 8 data bits and no parity.

Status Indicators and Queues

To assist in programming, the DS360 has 4 interface status indicators which are located

at the left side of the display. The REM LED is on when the DS360 is in a remote state

(front panel locked out). The ACT LED is on whenever data is being received by the

DS360. The ERR LED flashes when an error, such as an illegal command or out of range

parameter, has been detected. The SRQ LED is on when the DS360 generates a service

request. SRQ remains on until a GPIB serial poll is completed.

To help find programming errors, the DS360 can display the interface buffers on the

display. The GPIB queue is accessed by pressing [SHIFT][GPIB] twice in succession.

The RS232 queue is accessed by pressing [SHIFT][RS232] twice in succession. The last

256 characters received by each interface can be displayed in a scrollable 3 character

window. The data is displayed in ASCII hex format, where each character is represented

by 2 hexadecimal digits. The most recently received character is indicated by a decimal

point to the right of the digit. Turning the knob counterclockwise moves the data window

earlier into the data queue; turning the knob clockwise moves the data window later into

the queue. The window cannot be moved later than the last character received.

4-6 Remote Programming

DS360 Ultra Low Distortion Function Generator

Command Format

Communication with the DS360 uses ASCII characters. Commands may be in either

UPPER or lower case. A command to the DS360 consists of a four character command

mnemonic with an optional ?, arguments if necessary and a command terminator. The

terminator must be a linefeed <lf> or carriage return <cr> on RS232, or a linefeed <lf> or

EOI on GPIB. No command processing occurs until a terminator is received. Commands

function identically on RS232 and GPIB whenever possible. Command mnemonics

beginning with an asterisk (*) are IEEE-488.2 (1987) defined common commands. These

also function identically on RS232. Commands may require one or more parameters.

Multiple parameters are separated by a comma (,). Multiple commands may be sent on

the same line by separating them with semicolons (;).

There is no need to wait between commands. The DS360 has a 256 character buffer and

processes commands in the order received. If the buffer fills, the DS360 will hold off

handshaking on the GPIB and attempt to hold off handshaking on RS232. Similarly the

DS360 has a 256 character output buffer to store output until the host computer is ready

to receive it. If either buffer overflows, both buffers are cleared and an error is reported.

The present value of a particular parameter may be determined by querying the DS360

for its value. A query is formed by spending a question mark (?) with the command

mnemonic and omitting the desired parameter from the command. Values returned from

the DS360 are sent as a string of ASCII characters terminated with a carriage return <cr>

on RS232 and by a linefeed <lf> on GPIB. If multiple query commands are sent on one

command line (separated by semicolons), the answers will be sent individually, each with

a terminator.

Examples of Commands:

FREQ 1000 <lf> Set the Output Frequency to 1.0 kHz

*TRG <lf> Trigger a sweep or burst

FUNC? <lf> Query the output function.

Interface Ready and Status

The No Command bit in the Serial Poll Status Byte signals that the DS360 is ready to

receive and execute commands. When a command is received, this bit is cleared,

indicating that command execution is in process. No other commands will be processed

until this command is complete. Commands received during this time are stored in the

buffer to be processed later. Only GPIB serial polling will generate a response while a

command is in progress. When all pending commands have executed, the No Command

bit is set again. By checking the No Command bit, a host computer can ensure that all

previously sent commands have finished before sending a new command.

Since most commands execute very quickly, the host computer does not need to

continually check the No Command bit. Commands can be sent one after another and

they will process immediately. However some commands, such as self tests, may require

a long time to execute. In addition, the host computer may need to check that these

commands executed without error. In these cases, the status should be queried.

Remote Programming 4-7

DS360 Ultra Low Distortion Function Generator

When using the GPIB interface, serial polling may be used to check the No Command bit

while operation is in progress. After the bit becomes set, the ERR bit may be checked to

verify successful completion of the command.

If the RS232 interface is used, or serial polling is not available, then the *STB ? and

*ESR ? status query commands may be used to query the Status Bytes. Since the DS360

processes one command at a time, the status query will not be processed until the

previous command is complete. Thus a response to the status query itself signals that the

previous operation is finished. The query response may then be checked for various

errors.

SRQ

The user may issue an user SRQ (service request) over the GPIB. Only one SRQ (user or

otherwise) can be active at a time; the host computer must acknowledge any pending

SRQ’s before a new one is sent. Note that the user SRQ is in addition to the usual service

requests based on the unit’s status. See the section on status bytes later in this chapter for

more information.

GET (Group Execute Trigger)

The GPIB command GET will have the same effect as a *TRG command. If the DS360 is

configured for a single triggered sweep or burst, then the GET bus command will trigger

a sweep or burst. If the DS360 is not configured for one these, the command will be

ignored.

4-8 Remote Programming

DS360 Ultra Low Distortion Function Generator

Command Syntax

The four letter mnemonic in each command sequence specifies the command. The rest of

the sequence consists of parameters. Parameters shown in { } are not always required.

Generally, parameters in { } are required to set a value in the DS360. Multiple parameters

are separated by commas. Multiple commands may be sent on one command line by

separating them with semicolons (;).

The present value of a parameter may be determined by sending a query command.

Commands that may be queried have a question mark in parentheses (?) after the

mnemonic. Commands that may ONLY be queried have a ? after the mnemonic.

Commands that MAY NOT be queried have no ?. A query is formed by including the

question mark ? after the command mnemonic and omitting the queried parameter from

the command. The query parameters shown in { } are NOT sent with a query. The query

returns the value of these parameters. Values are returned as a string of ASCII characters.

NOTE: Do NOT send ( ) or { } as part of the command.

Variables are defined as follows:

i, j, k, n integers

x real numbers

All numeric variables may be expressed in integer, floating point or exponential formats

(i.e. the number five can be either 5, 5.0 or 05E1). Strings are sent as a sequence of

ASCII characters.

Remote Programming 4-9

DS360 Ultra Low Distortion Function Generator

Function Output Control Commands

Note: The analog output control commands may be selected only when the analog output type is selected.

If these commands are sent when the unit is in digital mode a “Not Appl” (not applicable)

message will be displayed on the screen and syntax error will occur. The command OUTD0

(analog output) should be sent at the beginning of any program that uses the analog output. Also

be aware that a couple of commands share common mnemonics and values with the digital output

(FUNC, STPE, FSTP).

FUNC (?) i

The FUNC command sets the output function type to i as shown below. The

FUNC? query returns the current function.

i Function

0 Sine

1 Square

2 White Noise

3 Pink Noise

4 2 Tone

FREQ (?) x

The FREQ command sets the frequency to x Hertz. The FREQ? query returns the

current output frequency. The frequency is set and returned with 10mHz

resolution. If the current waveform is NOISE , an error will be generated and the

frequency will not be affected. This command doesn’t set the frequencies for 2-

Tones. See TTAF and TTBF commands for 2-Tone frequencies.

AMPL (?) x

The AMPL command sets the output amplitude to x. The value x must consist of

the numerical value and a units indicator. The units may be VP (Vpp), VR (VRMS),

DB (dB in relative mode only, see RELA command below), DM (dBm) or DV

(dBV). For example, the command AMPL1.0DM will set the output to 1.0 dBm.

Setting the amplitude to 0 Volts will produce DC only, (no AC component), with

the output controlled by the OFFS command. For amplitude- offset limits, see

chapter 3.

The AMPL?x query, where x is the units indicator, will return the amplitude in

those units. For example, the AMPL?VR query will return 10.00VR. The

returned units will match the units indicator and the amplitude will be returned in

those units.

This command doesn’t set the amplitude for 2-Tones. See TTAA and TTBA

commands for 2-Tone amplitudes.

OFFS (?) x

The OFFS command sets the output DC offset to x volts. The OFFS? query

returns the current value of the DC offset. For amplitude-offset limits see chapter

4-10 Remote Programming

DS360 Ultra Low Distortion Function Generator

OUTE (?) i

The OUTE command disables the output for i=0 and enables the output for i=1.

The OUTE? query returns the current status of the output.

OUTM (?) i

The OUTM command selects the output mode of the instrument. For i=0 the

output is unbalanced and for i=1 it is balanced. The OUTM? query returns the

current output mode.

TERM (?) i

The TERM command sets the output source impedence as indicated in the table

below. The TERM? query returns the current source impedance setting. An error

will be generated if the output impedance selected is not valid for the current

output mode.

i Source Impedance

0 50 Ω

1 150 Ω

2 600 Ω

3 Hi-Z

RELA (?) i

The RELA command sets (queries) the relative mode for the output amplitude.

For i=1, the relative mode is active, with the current amplitude setting as the

relative amplitude. New values are set using dB relative to this value. For i=0 (or

when setting a value in units other than dB) the relative mode is inactive. This

command has no effect when 2Tone is selected.

STPE (?) i

The STPE command enables (i=1) or disables (i=0) the usage of the frequency

step, which is set by the FSTP command. The STPE? query returns the current

step enable mode.

FSTP (?) x

The FSTP command sets the frequency step to x Hertz. The FSTP? query returns

the current step frequency. The step is active only for the main frequency

(FREQ) and STPE (step enable) = 1. The value x may range between 10mHz and

200kHz.

When the frequency step is enabled, it becomes the knob increment value.

TTAA (?) x

The TTAA command sets the Tone 1 amplitude to x. The value x must consist of

the numerical value and a units indicator. The units may be VP (V pp), VR (VRMS)

DM (dBm) or DV (dBV). For example, the command TTAA1.0VP will set the

Tone 1 to 1.0Vpp. The maximum value for the sum of Tone 1 and Tone 2

amplitude, as well as the ratio of the two, is limited as described in chapter 3. If

the DS360 must modify the amplitude of either Tone 1 or 2, due to under or over

ranging, a message is sent on the front panel and bit 3 in the DDS register is set.

Remote Programming 4-11

DS360 Ultra Low Distortion Function Generator

The TTAA? query will return the amplitude in the currently displayed units. For

example, if the display shows 10.0 VRMS, the TTAA? query will return 10VR. If

the units indicator is sent along with the command (such as TTAA?VP), the

returned units will match the units indicator and the amplitude will be returned in

those units.

TTBA (?) x

The TTBA command sets the Tone 2 amplitude to x. The value x must consist of

the numerical value and a units indicator. The units may be VP (Vpp), VR (VRMS)

DM (dBm) or DV (dBV). For example, the command TTBA1.0VP will set the

Tone 2 to 1.0Vpp. The maximum value for the sum of Tone 1 and Tone 2

amplitude, as well as the ratio of the two, is limited as described in chapter 3. If

the DS360 must modify the amplitude of either Tone 1 or 2, due to under or over

ranging, a message is sent on the front panel and bit 3 in the DDS register is set.

The TTBA? query will return the amplitude in the currently displayed units. For

example, if the display shows 10.0 VRMS, the TTBA? query will return 10VR. If

the units indicator is sent along with the command (such as TTBA?VP), the

returned units will match the units indicator and the amplitude will be returned in

those units.

TTAF (?) x

The TTAF command sets the Tone1 frequency to x Hertz. The TTAF? query

returns the current Tone1 frequency. The frequency is set and returned with

10mHz resolution.

TTBF(?) x

The TTBF command sets the Tone 2 frequency to x Hertz. The TTBF? query

returns the current Tone 2 frequency. The Tone 2 frequency must be a legal value

for the 2-Tone type selected (see TTMD). If Tone 2 is a sinewave, the frequency

is set and returned with 10mHz resolution. If Tone 2 is a squarewave, the

frequency is set and returned with 2 digits of resolution (ie. 4.8kHz or 110Hz, but

not 101Hz).

TTMD (?) i

The TTMD command sets the Tone 2 mode to either sine (i=0) or square

(i=1).The TTMD? query returns the current Tone 2 mode.

4-12 Remote Programming

DS360 Ultra Low Distortion Function Generator

Modify Function Commands

Note: Most of the modify function parameters may be selected at any time that the unit is in analog

mode. To observe the changes effecting the output, be sure that the appropriate modifying type is

selected and the modify function is on. Some of the parameters cannot be modified for all settings. These

are indicated below. When this occurs, a “Not Appl” (not applicable) message will be displayed on the

screen and syntax error will occur.

If these commands are sent when the unit is in digital mode a “Not Appl” (not applicable) message will

be displayed on the screen and syntax error will occur. The command OUTD0 (analog output) should be

sent at the beginning of any program that uses the analog output.

*TRG

The *TRG command triggers a burst or a single sweep.The trigger source must

be set to SINGLE.

MENA (?) i

The MENA command enables the modify function for i=1 and disables it if i=0.

The MENA? query returns the current modify function status.

MTYP (?) i

The MTYP command sets the modify function type to i as described in the table

below. The MTYP? query returns the current type.

i Modify Function

0 LIN SWEEP

1 LOG SWEEP

2 BURST

3 BW NOISE

If the modify function is changed to a type which is incompatable with the

currently selected output waveform, a range error will be sent and the command

will be ignored.

If the parameter currently being displayed is undefined for the new MTYP (for

example: start freq and burst), the “Not Appl” message will appear, a range error

will be returned and the display will be changed to FREQ, regardless of what

was displayed previously.

TSRC (?) i

The TSRC command sets the trigger source for bursts and sweeps to i as

described in the table below. The TSRC? query returns the current trigger

source.

Remote Programming 4-13

DS360 Ultra Low Distortion Function Generator

i Source

0 INTERNAL

1 EXTERNAL

2 SINGLE

3 GATE (burst only)

If the trigger source is set to gate when the unit is in burst mode and the unit is

changed to sweep mode, the trigger source will change to internal.

STFR (?) x

The STFR (?) command sets (queries) the sweep start frequency to x Hertz. An

error will be generated if the start frequency is higher than the current stop

frequency.

SPFR (?) x

The SPFR (?) command sets (queries) the sweep stop frequency to x Hertz. An

error will be generated if the stop frequency is lower than the current start

frequency.

RATE (?) x

The RATE command sets the sweep rate to x Hz. The value x is rounded to 2

significant digits and may range from 0.1 Hz to 3.1 kHz. The RATE? query

returns the sweep rate in Hertz.

BCNT (?) x

The BCNT command sets the burst count to x (1 to 65534). The BCNT? query

returns the current burst count. The maximum value of x is limited to 1 less than

the value of RCNT (see below). If this is exceeded a range error will occur. The

burst count can also be set to .5, for a 1/2 cycle burst. The string “.5” must be

sent without a leading zero (do not send “0.5”!).

RCNT (?) i

The RCNT command sets the burst rate count to i (1 to 65535). The RCNT?

query returns the current burst rate count. Setting RCNT less than or equal to the

current BCNT will adjust BCNT to RCNT-1 (to .5 if RCNT is 1). An “ADJ

BUR” message will be displayed and bit 3 (parameter adjust) will be set in the

DDS status byte.

DPTH (?) x

The DPTH command sets the burst depth to x. The value x must consist of the

numerical value and a units indicator. The units must be DB (dB) or PR (%). If

a 0% value is set, a query of DB will return -999 as an overflow value. The range

for x is 0% to 100% or 0dB to -60dB. A query must be followed by one of the

units indicators, for example DPTH?DB.

NBCT (?) x

The NBCT command sets the Noise Burst Count to x. The NBCT? query the

Noise Burst Count. The minimum value of x must be within 4 digits of NRCT;

the maximum must be less than NRCT (i.e. for NRCT=3s, NBCT ranges from

1ms to 2.999s).

4-14 Remote Programming

DS360 Ultra Low Distortion Function Generator

NRCT (?) x

The NRCT command sets the Noise Rate Count to x. The NRCT? query returns

the current value of this parameter. x may range from 2 µs to 600 s.

If NRCT is set to a value lower than NBCT, NBCT is adjusted to NRCT/10; if

NRCT is set to a value more than 4 digits above NBCT, NBCT is adjusted to the

lowest allowable in that range (i.e. if NBCT=1ms, setting NRCT to 600s will

adjust NBCT to 100ms). An “ADJ BUR” message is displayed and bit 3 in the

DDS Status Byte is set in this case.

BNDW (?) i

The BNDW command sets the white noise bandwidth to one of the following

frequencies:100 Hz, 200 Hz, 400 Hz, 800 Hz, 1.6 kHz, 3.2 kHz, 6.4 kHz, 12.8

kHz, 25.6 kHz, 51.2 kHz, 102.4 kHz. The value i is always expressed in Hz.

Values lower then 100 Hz will set BNDW to 100 Hz; all other values will be

rounded down.

CENF (?) i

The CENF command sets the white noise center frequency to i , which ranges

from 0 to 200kHz. The resolution of i is 200 Hz; all settings will be adjusted to i

modulo 200. CENF? query returns the currently set value.

Remote Programming 4-15

DS360 Ultra Low Distortion Function Generator

Setup Control commands

*IDN?

The *IDN? common query returns the DS360 device identification string. This

string is in the format: “StanfordResearchSystems,DS360,sn,vn” where sn is the

five digit serial number of the particular unit and vn is a 3 digit firmware version

number.

*RCL i

The *RCL command recalls stored setting number i, where i may range from 0 to

9. If the stored setting is corrupt or has never had anything stored in it, an

execution error will be generated. RCL0 recalls the default setting of the

instrument (see Chapter 3 for the default settings).

*RST

The *RST common command resets the DS360 to its default configuration,

initializes the unit and runs the self tests. It behaves the same as cycling the

power off and on. The communication setup is not changed. All other modes and

settings are set to the default conditions and values. This command takes some

time to complete.

*SAV i

The *SAV command saves the current instrument settings as setting number i,

where i ranges from 1 to 9 (setting number 0 is the default setting). An error will

be generated if data is saved to setting 0.

KEYS (?) i

The KEYS command simulates the pressing of a front panel key. The KEYS?

query returns the keycode of the most recently pressed key. Keycodes are

assigned as follows:

Key Name Key Code

ey Name

Key Code

FUNCTION UP 1

FUNCTION DOWN

OUTPUT UP 3

TRIGGER 4

MODIFY FUNC UP

FREQ 6

AMPL 7

OFFS 8

FUNCTION ON/OFF

MODIFY FNC DOWN 10

SWP BURST ON/OFF 11

rms / %

START/CENTER

pp / Vdc / dB

STOP/BW 13

Hz / dBm

RATE 14

z / dBV

SHIFT 15

ot used

STO 16

ight arrow

RCL 17

eft arrow

CLR 18

+/- 19

ot used

(.) 20

ot used

4-16 Remote Programming

DS360 Ultra Low Distortion Function Generator

Status Reporting Commands

Note: See tables at the end of the programming section for Status Byte definitions.

*CLS

The *CLS common command clears all status registers. This command does not

affect the status registers.

*ESE (?) i

The *ESE command sets the standard event status byte enable register to

decimal value i.

*ESR? {i}

The *ESR common command reads the value of the Standard Event Status

Reading this register will clear it, while reading bit i will clear just bit i.

*PSC (?) i

The *PSC common command sets the value of the power-on status clear bit. If

i=1, the power-on status clear bit is set and all status registers and enabled

registers are cleared at power on. If i=0, the bit is cleared and the registers

maintain their values at power on.

*SRE (?) i

The *SRE common command sets the serial poll enable register to the decimal

value of parameter i.

*STB? {i}

The *STB common query reads the value of the serial poll byte. If i is present,

the value of bit i is returned (0 or 1). Reading this register has no effect on its

value as it is a summary of other status registers.

DENA (?) i

The DENA command sets the status enable register to the decimal value of

parameter i.

STAT? {i}

The STAT? query reads the value of the DDS status byte. If i is present, the

value of bit i is returned (0 or 1). Reading this register will clear it while reading

bit i will clear just bit i.

Remote Programming 4-17

DS360 Ultra Low Distortion Function Generator

Hardware Test and Calibration Commands

*TST?

The *TST? common query runs the DS360 internal self tests. After the tests are

complete, the test status is returned as a one byte decimal value. If the value is 0,

no errors have been detected, otherwise the returned value is the encoded value

of the status of the test register described below.

bit Meaning

0 CPU error detected

1 ROM checksum error

2 RAM error detected

3 CALD calibration data chksum err

4 DSP error detected

5 unused

6 unused

7 reserved

Note: The following commands are primarily intended for factory calibration of the DS360 and

should never be needed during normal operation. Incorrect use of some of these commands can

alter the calibration of the DS360. If this happens, perform a full reset, as described in chapter 3.

$FCL

The $FCL command recalls the factory calibration bytes. This command will

generate an error if the calibration jumper is not in the correct position.

$FIL (?) i

The $FIL command sets the State Variable Filter to the i-th filter, when a

previous $NOF1 or $NOF2 command has been sent. In the $NOF0 mode this

command is disabled and the filter number is selected as a function of frequency.

The $FIL? query returns the currently selected filter number. The range for i is 0

to 36, where 0 means no filter is selected.

$NOF (?) i

The $NOF command sets the filter mode to 0, 1 or 2. Mode 0 is normal, the Z80

sets the appropriate filter function of frequency and tells the DSP which filter is

set. In mode 1, the Z80 sets the filter function of $FIL command and tells the

DSP that filter 0 is set. In mode 2, the Z80 sets the filter function of $FIL

command and tells the DSP which filter is set. The $NOF query returns the

current mode.

$PRE (?) i

The $PRE command sets the DS360 pre-amplifier attenuators to range i. The

integer i is the attenuation range which takes values from 0 to 31. Each range

sets the pre-attenuators to -1.25*i dB. Setting the amplitude will return the

attenuators to their normal position. The $PRE? query returns the current

attenuator position.

4-18 Remote Programming

DS360 Ultra Low Distortion Function Generator

$PST (?) i

The $PST command sets the DS360 post-amplifier attenuators to range i. The

integer i is the attenuation range, which takes values from 0 to 3. Each range sets

the post-attenuators to -20*i dB. Setting the amplitude will return the attenuators

to their normal position. The $PST? query returns the current attenuator position.

$WRD (?) j, {k}

The $WRDj,k command sets the value of calibration word j to k. Parameter j

may have a value from 0 to 950, while k may range from - 3270 to 65535. This

command will generate an error if the calibration jumper is not enabled. NOTE:

This command will alter the calibration of the DS360. To recall the factory

calibration, use the $FCL command (Factory Calibration Calbytes). Calibration

bytes cannot be altered unless the warm-up bit has been set. NOTE: This is a

factory command only and is not available for customer use.

Remote Programming 4-19

DS360 Ultra Low Distortion Function Generator

Status Byte Definitions

The DS360 reports on its status by means of three status bytes: the Serial Poll

Byte, the Standard Status Byte and the DDS Status Byte.

Upon power on, the DS360 may either clear all of its status enable registers or

maintain them in the state they were in on power down . The *PSC command

determines which action will be taken.

The status bits are set to 1 when the event or state described in the tables below

has occured or is present.

Serial Poll Status Byte

Bit Name Set When

0 Mod Done No modify function in progress

1 Mod Enable Modify function enabled

2 User SRQ User sends a front panel SRQ

3 DDS An unmasked bit in DDS is set

4 MAV The gpib output queue non-empty

5 ESB An unmasked bit in ESB is set

6 RQS/MSS SRQ (service request) has occured

7 No Command

No unexecuted commands in the input queue

The DDS and ESB bits are set whenever any unmasked bit (a bit with the

corresponding bit in the byte enable register set) in their respective status

registers are set. Use DENA and *ESE commands to set the enable register bits.

The DDS and ESB bits are not cleared until ALL enabled status bits in DDS and

ESB status bytes are cleared (by reading the status bytes or using *CLS).

Using *STB? to Read the Serial Poll Status Byte

A bit in the Serial Poll Status Byte is NOT cleared by using *STB?. The bit stays

set as long as the status condition exists. This is true even for RQS. RQS will be

set whenever the same bit in the Serial Poll Status Byte AND Serial Poll enable

registers are set. This is independent of whether a serial poll has occured to clear

the service request.

Using Serial Poll

Except for SRQ, a bit in the Serial Poll Status Byte is NOT cleared by polling

the status byte.When reading the status byte using a serial poll, the RQS bit

signals that the DS360 is requesting service.The RQS bit will be set to 1 the first

time the DS360 is polled following the service request. The serial poll

automatically clears the service request. Subsequent serial polls will return RQS

cleared (0) until another service request occurs. Polling the status byte and

reading it with *STB? can return different values for RQS. When serial polled,

RQS indicates a service request has occured. When read with *STB?, RQS

indicates that an enabled status bit is set.

4-20 Remote Programming

DS360 Ultra Low Distortion Function Generator

Standard Event Status Byte

Bit Name Set When

0 Unused

1 Unused

2 Query Error Set on output queue overflow

3 Unused

4 Execution Error A command cannot be executed (Range Error)

(Parameter out of range, command not valid, etc.)

5 Command Error Command Syntax Error or unrecognized

command

6 URQ Set by any keypress

7 PON Set by Power ON

This status byte is defined by IEEE-488.2 (1987) and is used primarily to report

errors in commands received over the communications interface. The bits in this

the *CLS command.

DDS Status Byte

Bit Name Set When

0 Trig’d A burst or sweep is triggered

1 Trig Err A trigger rate error occurs

2 unused

3 Adjust Msg A 2-Tone or Burst parameter is adjusted

4 Warmup Warm-up period expired

5 Test Error A self test error occurs

6 Cal Enabled 1 = calibration enabled

7 Mem Error The stored settings where corrupt

The Warm-up bit will be set and remain set after the warm up period has

expired. The rest of the bits in this register are set when the corresponding event

occurs and remain set until cleared by reading this status byte (*ESR) or by the

*CLS command.

Remote Programming 4-21

DS360 Ultra Low Distortion Function Generator

Example Programs

Using Microsoft C with the National Instruments GPIB card on a PC

To succesfully interface the DS360 to a PC via the GPIB interface, the

instrument, interface card and interface drivers must all be configured properly.

To configure the DS360, the GPIB address must be set in the [SHIFT][GPIB]

menu.The default address is 8; use this address unless a conflict occurs with

other instruments in your system. The DS360 will be set to GPIB address 8

whenever a reset is performed (power on with the CLR key pressed).

Make sure that you follow all of the instructions for installing the GPIB card.

The National Instruments card cannot be simply unpacked and put into your

computer. To configure the card , you may need to set jumpers and switches on

the card to set the I/O address and the interrupt levels. You must run the program

“IBCONF” to configure the resident GPIB driver for your GPIB card. Please

refer to the National Instruments manual for more information. In these

examples, the following options must be set with IBCONF:

Device Name: DS360

Device Address: 8

EOS Character: 0Ah (linefeed)

Terminate Read on EOS: Yes

Once all the hardware and GPIB drivers are configured, use “IBIC”. This

terminal emulation program allows you to send commands to the DS360 directly

from the computer keyboard. If you cannot talk to the DS360 via “IBIC”, then

your programs will not run.

Use the simple commands provided by National Instruments. Use “IBWRT” and

“IBRD” to send and receive from the DS360. After you are familiar with these

simple commands, you can explore more complex programming commands.

4-22 Remote Programming

DS360 Ultra Low Distortion Function Generator

Example1: GPIB Communication in C language

C program to demonstrate communication with the DS360 via GPIB.

Written in Microsoft C and uses National Instruments GPIB card.

Assumes DS360 is installed as device name DS360.

Refer to National Instruments for Device Name setup.

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#include <dos.h>

#include <decl.h> /* National Instruments header files */

void main(void);

int ds360;

void main()

{

char cmd[40];

char start[20];

char stop[20];

if ((ds360 = ibfind(“DS360”)) < 0) /* open National driver */

{

printf (“Cannot find DS360\n”);

exit(1);

}

/* Now that the driver is located, reset the DS360 */

sprintf (cmd,“*RST\n”);

ibwrt(ds360,cmd,strlen(cmd)); /* send command */

/* Setup the DS360 as follows:

50kHz,square wave,1.5Vpp, -1.0Volt offset,display offset */

sprintf (cmd, “FREQ50000”;FUNC1;AMPL1.5VP;OFFS-1.5;KEYS8\n”);

ibwrt(ds360,cmd,strlen(cmd)_; /* send command */

/* Now, query the DS360 for the sweep start and stop frequencies */

sprintf(cmd, “STFR?\n”); /* ask for start freq */

ibwrt(ds360,cmd,strlen(cm)); /* send query */

ibrd(ds360,start,20); /* read back start freq*/

sprintf(cmd, “SPFR?\n”); /* ask for stop freq */

ibwrt(ds360,cmd,strlen(cm)); /* send query */

ibrd(ds360,stop,20); /* read back start freq*/

printf(“\n\n\n\n **** DS360 Setup Demo ****”);

printf(“\n\nDS360 Sweep Start Frequency = %eHz\n\n”,atof(start));

printf(“\n\nDS360 Sweep Stop Frequency = %eHz\n\n”,atof(stop));

}

Remote Programming 4-23

DS360 Ultra Low Distortion Function Generator

Example 2: RS232 communication in BASIC language

BASIC program to demonstrate communication with the DS360 via RS232.

Program assumes the DS360 BAUD rate is set to 9600.

10 OPEN “com2:9600,n,8,2,cs,ds,cd” FOR RANDOM AS #1 ‘ Setup com2’

20 PRINT #1, “ ”

30 PRINT #1, “*RST” ‘ Reset the DS360’

40 GOSUB 190 ‘ Query DS360 and display result’

50 PRINT #1, “FREQ123456” ‘ Set new frequency to 123.456kHz’

60 GOSUB 190 ‘ Query DS360 and display result’

70 PRINT #1, “*RST” ‘ Reset the DS360’

80 FOR I=0 TO 4 ‘ Step through all functions ‘

90 PRINT #1, “FUNC”,I

100 GOSUB 190 ‘ Query DS360 and display result’

110 NEXT I

120 PRINT #1, “*RST” ‘ Reset the DS360’

130 PRINT #1, “AMPL0VP” ‘ Set amplitude to 0 volts’

140 FOR I=-5 TO 5 ‘ Set offset from -5V to 5v’

150 PRINT #1, “OFFS”,I ‘ and query each time’

160 GOSUB 190 ‘ Query DS360 and display result’

170 NEXT I

180 END

‘ Routine to query the DS360 frequency,’

190 PRINT #1, “FREQ?” ‘ amplitude and offset and display them’

200 INPUT #1, F

210 PRINT #1, “AMPL?VP”

220 INPUT #1, A

230 PRINT #1, “OFFS?”

240 INPUT #1, O

250 PRINT “Freq=“ ;F; “ Ampl=“; A; “ Offs=“; O

260 RETURN

4-24 Remote Programming

DS360 Ultra Low Distortion Function Generator

5-1

DS360 Ultra Low Distortion Function Generator

Chapter 5

Performance Tests

The performance tests described in this section are designed to verify with a high degree of confidence

that the unit is performing within the specifications.

The results of each test should be recorded on a of the test sheet located at the end of this section. copy

In this Chapter

Getting Ready 5-3

Keypad 5-3

Knob 5-3

Reset 5-3

Serial Number 5-3

Firmware Revision 5-3

Necessary Equipment 5-4

Warm-up 5-4

Test Record 5-4

Distortion Measurements 5-5

1. Front Panel Test 5-7

2. Self Tests 5-8

3. Frequency Test 5-9

4. Amplitude Test 5-10

5. Harmonic Distortion 5-13

6. Waveform Test 5-15

7. Sweep Test 5-17

8. Burst Test 5-18

9. DC Offset Test 5-19

10. Output Impedance 5-21

Performance Record 5-23

5-2 Performance Tests

DS360 Ultra Low Distortion Function Generator

Performance Tests 5-3

DS360 Ultra Low Distortion Function Generator

Getting Ready

Parameters are set in the DS360 using the front panel keypad or the spin knob. Most parameters can be set

directly from the keypad, although it is often more convenient to use the spin knob. Keys are referenced

by brackets like this [ ]. KEY

Keypad

Use the up and down arrow keys [ ], [ ] to change between functions. To set a parameter, press  

the the key with the desired parameter on it, ( for example, to set the frequency). The [FREQ]

current value will be displayed. Most major parameters are labeled on the key itself; minor

parameters are labeled above the key in grey. To display these values first press the key, [SHIFT]

then the desired key ( to set the trigger source). To change the value, press [SHIFT] [TRIG SRC]

the appropriate numeric keys, followed by the correct units key. If the value has no particular

units, any of the entry keys may be used. If an error is made, press the key to return to the [CLR]

current value. If the value entered is outside the allowable limits the DS360 will beep and display

an error message.

Knob

The spin knob can be used to modify most parameters. Display the current value as discribed for

the keypad and turn the knob to increment or decrement the parameter. The decade that is being

incremented (or decremented) will flash. To change the decade that is being modified, use the left

and right cursor keys [ ], [ ].  

Reset

Throughout this section, it will be necessary to reset the DS360 into a known state. To do this,

turn the power off, wait briefly and turn the power back on while holding down the key. [CLR]

The unit will perform its power-on self-tests and then assume the default settings. Each test

generally starts with a reset.

Serial Number

If you need to contact Stanford Research Systems, please have the serial number of your unit

available. The serial number is printed on a label affixed to the rear panel. It also appears on the

display when the unit is first powered on.

Firmware Revision.

The firmware revision code is displayed on the screen when the unit is first powered on.

Necessary Equipment

The following equipment is necessary to complete the tests. The suggested equipment or its

equivalent may be used.

5-4 Performance Tests

DS360 Ultra Low Distortion Function Generator

Instrument Critical Specification Recommended Model

Analog Oscilloscope 100 MHz Bandwidth Tektronix 2252

Time Interval Counter Time Interval Accuracy: 1 ns

Frequency Accuracy: <5ppm

SR620

FFT Spectrum Analyzer Frequency Range: DC to 100 kHz

Amplitude Accuracy +/- 0.1 dB

Distortion and Spurious: <80 dB

SR780

DC/AC Voltmeter 5 1/2 Digits DC Accuracy

0.1% AC Accuracy

True RMS AC to 100 kHz

HP3458A

Feedthrough Termination

50 +/- 0.2%, 1 Watt  Any

Notch Filters 100 Hz

1 kHz

20 kHz

Homemade (see the description

on Distortion Measurements

below)

Warm Up

The DS360 should be turned on and allowed to warm up for at least an hour before the

performance tests are preformed. The self tests and functional tests do not require any warm up

period.

It is necessary to turn the unit off and on to reset it. As long as the unit is turned back on within a

minute, this will not effect the tests results.

Test Record

Make a copy of the DS360 Performance Test Record at the end of this section. Fill in the results

of the tests on this record. The record will allow you to determine whether the unit passes or fails

the tests and preserves a record of the tests.

If a Test Fails

Check the settings and connections of any external equipment and, if possible, verify its operation

using an oscilloscope or other piece of test equipment.

After checking the setup, repeat the test from the beginning to make sure that the test was

performed correctly.

If a test continues to fail, contact Stanford Research Systems for further instructions. Make sure

that you have the unit serial number and firmware revision number handy. Have the test record on

hand as well.

Performance Tests 5-5

DS360 Ultra Low Distortion Function Generator

Distortion Measurements

The notch filters described here are used with a spectrum analyzer for verifying the distortion

performance of the DS360. Since there are few, if any, spectrum analyzers with a -120 dB

distortion floor, a pre-filter is necessary to attenuate the fundamental frequency and increase the

sensitivity to distortion signals. Since the pre-filter attenuates the fundamental component far

more than any of the harmonics, the distortion products can be viewed using a spectrum analyzer

with a more reasonable -80 dB distortion floor. The figure below shows a “twin-tee” notch filter.

Figure 5-1 Twin-Tee Notch Filter

Filter Component Values

Filter Center Frequency

Resistor “R” Value

Capacitor “C” Value

1.0 kHz

7.87 K



0.01



11.0 kHz

7.15 K



0.001



31.0 kHz

2.55 K



0.001



It is important to use high quality resistors and capacitors in the twin-tee notch filter, or distortion

measurements will be limited by its performance. Thin film resistors and npo ceramic, or

polystyrene capacitors should be used.

The “twin-tee” filter attenuates harmonic components as well as the fundamental, although not

nearly as much. The harmonics are attenuated by:

Harmonic

Attenuation

2nd

9 dB

3rd

5 dB

4th

3 dB

2 dB

>5th 

0 dB

To obtain the true harmonic distortion, these values must be added to the readings obtained from

the spectrum analyzer. In addition, the amplitude of the fundamental must be taken into account.

For example, if the 2nd harmonic of a 10 VRMS signal is measured at -112 dBVRMS , the true value

of the 2nd harmonic would be -123 dB (112 dB + 20 dB - 9 dB).

5-6 Performance Tests

DS360 Ultra Low Distortion Function Generator

Total harmonic distortion can be calculated from the following formula:

_________________________________________________

T.H.D. (dB) = 20 log (



(log-1(2nd))2 + (log-1(3rd))2 + (log -1(4th))2 + ... + (log -1(nth))2 )

where 2nd, 3rd, 4th, ... nth are the values of the corresponding harmonics in dB relative to the

fundamental.

Performance Tests 5-7

DS360 Ultra Low Distortion Function Generator

1. Front Panel Test

This test verifies the functionality of the front panel display, LED’s, keys and knob.

Setup

No external setup is required.

Procedure

1) Turn on the DS360 while holding down the [FREQ] key. A single segment of the display should

light.

2) Press the [ ] to light each segment (of 7) of the left 2 digits and decimal points. Only one segment 

should be on at a time. Pressing the [ ] key will go back to the previous segment. 

3) After lighting all seven segments and the decimal point of one digit, all segments and decimal

points will light .

4) Continue to press the [ ] to light each of the LED’s on the front panel.They should light one at a 

time, top to bottom, left to right.

5) After all of the LED’s have been lit, press each of the front panel keys. Each key will have a

unique keycode. Keycodes advance top to bottom, left to right.

6) Turn the DS360 off and back on again.

7) Turn the spin knob to verify that it modifies the frequency.

8) This completes the front panel test. Enter the results of the test oin the test record located at the

end of this section.

5-8 Performance Tests

DS360 Ultra Low Distortion Function Generator

2. Self Tests

This test verifies that the DS360’s memory and processors are functional.

Setup

No external setup is required.

Procedure

1) Turn on the DS360. The ROM firmware version number and the serial number should be

displayed for about 3 seconds. The self tests will execute and the message should “Tests Pass”

be displayed. If an error message appears, see the section in TROUBLESHOOTING Chapter 3

for a description of the error.

2) This completes the self tests. Enter the results of the test on the test record located at the end of

this section.

Performance Tests 5-9

DS360 Ultra Low Distortion Function Generator

3. Frequency

This test measures the frequency accuracy of the DS360.

Setup

Connect one of the DS360 BNC outputs to the Time Interval Counter. Set the Time Interval Counter to

measure frequency with a 1 second gate.

Procedure

1) Reset the DS360 (Turn power off, wait 2 seconds, then turn power on w/ pressed). [CLR]

2) Press

[AMPL][1][0][V

RMS ]

[FREQ][1][0][0][kHz]

3) The frequency value on the Time Interval Counter should read 100.000 kHz 2.5 Hz. 

4) This completes the frequency accuracy tests. Enter the results of the test on the test record located

at the end of this section.

5-10 Performance Tests

DS360 Ultra Low Distortion Function Generator

4. Amplitude

This test measures the amplitude accuracy of the DS360. For the sine, white noise and pink noise the

DVM will be used directly to measure the amplitude. The amplitude for balanced measurements is

defined as the voltage between the + and - BNC outputs. Due to the relatively slow rise time of the

squarewaves, the DVM cannot be used directly for higher frequency measurements. An initial

measurement of the squarewave is made at 100 Hz, where the rise and fall times are inconsequential to

the measurement. The amplitude is then measured using the scope to provide an accurate reference for

higher frequency measurements.

Setup

Connect the DS360 + BNC output to the DVM and the scope using a BNC tee. Set the DVM to Vrms,

with a long enough integration time to ensure 0.1% accuracy. Connect the DS360 SYNC OUT to the

DVM trigger input. Set the DVM to synchronous sub-sampled, external sync (for HP3458A).

Procedure

1) Reset the DS360 (Turn power off, wait 2 seconds, then turn power on w/ pressed). [CLR]

2) The sine amplitude accuracy is verified at 1.0 kHz and various amplitudes. For each amplitude,

perform steps 2b and 2c.

Voltage (Vrms) Voltage (Vrms)

14.0

0.4

12.0

0.04

10.0

0.004

7.0

0.00125

4.0

a) Press

[FREQ][1][kHz]

b) Press

[AMPL][ ] amplitude

c) Record the amplitude value from the DVM.

3) The balanced output amplitude is verified at 4 amplitudes. For each amplitude, perform steps 4c

and 4d.

Voltage (Vrms)

8.0

0.8

0.08

0.008

a) Connect the + (red) banana output to the + DVM input. Connect the - (white) banana output to

the DVM - input. Connect the common (black) banana to the DVM guard input (if available).

Performance Tests 5-11

DS360 Ultra Low Distortion Function Generator

b) Press

[ ] (output down) to select balanced output. 

c) Press

[AMPL][ ] amplitude

d) Record the amplitude value from the DVM.

4) The sine amplitude accuracy is verified at 1.0 VRMS and various frequencies. Reconnect the +

BNC to the DVM. For each frequency perform steps 5b through 5c.

Frequency

10 Hz

2.0 kHz

20 Hz

5.0 kHz

50 Hz

10 kHz

100 Hz

20 kHz

200 Hz

50 kHz

500 Hz

100 kHz

1.0 kHz

200 kHz

a) Press

[AMPL][1][V

RMS ]

b) Press

[FREQ][ ] frequency

c) Record the amplitude value from the DVM.

5) The anti-aliaising filter (used for sweeps) accuracy is verified at 1.0 VRMS. To do this, the DS360

is set for an externally triggered sweep, with no triggers provided. This causes the stop frequency

to be continuously output, which can be measured. For each frequency listed in step 5, perform

steps 6b and 6c.

a) Press

[SHIFT][TRG SRC]

Turn the spin knob until (external source) is displayed. Src. Etn

[START/CENTER][1][Hz]

b) Press

[STOP/BW][ ] frequency

c) Record the amplitude value from the DVM.

6) The square amplitude accuracy is verified at 2.0 VPP. For each frequency perform steps 7d through

7e, using the frequencies listed in step 5.

a) Press [ ] to change the function to a squarewave. Set the scope to 0.5V / div. 

b) Press

[AMPL][2][V

PP ]

[FREQ][100][Hz]

5-12 Performance Tests

DS360 Ultra Low Distortion Function Generator

c) Record the VRMS value from the DVM and the VPEAK-PEAK value from the scope.

d) Press

[FREQ][ ] frequency

e) Record the VPEAK-PEAK value from the scope.

f) Calculate the flatness using using the minimum (Min) and maximum (Max) values from the

peak to peak values.

(

)

( )

Max

Min

Max Min





100% ________ %

7) The white and pink noise amplitude accuracy is verified at a single amplitude level using the

DVM. Note that noise signals, especially the pink noise, will vary and require a very long

integration time for stable measurements. Set the DVM to analog (non synchronous, no external

sync) with an integration time of over 10 seconds.

a) Press

[RCL][0][entry key] to reset the the unit to its default state.

[ ][ ] to change the function to white noise.  

b) Press

[AMPL][1][V

RMS ]

c) Record the amplitude value from the DVM.

d) Press

[ ] to change the function to pink noise. 

e) Press

[AMPL][1][V

RMS ]

f) Record the amplitude value from the DVM.

8) This completes the amplitude accuracy tests. Enter the results of this test on the test record located

at the end of this section.

Performance Tests 5-13

DS360 Ultra Low Distortion Function Generator

5. Harmonic Distortion and Noise

These tests check the harmonic distortion for sine and square waves.

Setup

Set the spectrum analyzer input to shield grounded with AC coupling. Obtain the notch filters described

on page 5-5.

Procedure

1) Reset the DS360 (Turn power off, wait 2 seconds, then turn power on w/ pressed. [CLR]

2) The distortion is verified at 2 amplitudes and 3 frequencies. Set the spectrum analyzer to

exponential vector averaging, with 50 averages and dBVRMS units. For each frequency and

amplitude setting below, perform 2a through 2d.

Frequency Span Input Range (1V

RMS

) Input Range (10V

RMS

)

1.0 kHz

0 to 12.5 kHz

36 dBV

22 dBV

11 kHz

0 to 100 kHz

36 dBV

22 dBV

31 kHz

0 to 100 kHz

36 dBV

22 dBV

a) Connect the + output of the DS360 to the Spectrum analyzer through the appropriate filter.

b) Set the spectrum analyzer to the appropriate span and input range. Wait for the display to

settle.

c) Measure the 2nd through 5th harmonics values and calculate the THD (total harmonic

distortion) as described in the beginning of the section. Record the THD value on the test record.

d) Connect the - output to the notch filter and perform steps 2b and 2c for the - output.

3) The residual output noise is verified at the same 2 amplitudes and 3 frequencies as the distortion.

Set the spectrum analyzer to measure PSD (power spectrial density) with exponential RMS

averaging, 50 averages and VRMS units. For each frequency and amplitude setting in step 2,

perform 3a through 3d.

a) Connect the + output of the DS360 to the Spectrum analyzer through the appropriate filter.

b) Set the spectrum analyzer to the appropriate span and input range. Wait for the display to

settle.

c) Measure the noise at non harmonically related points. Avoid frequencies near the fundamental,

since they are effected by the notch filter. Record the noise value on the test record.

d) Connect the - output to the notch filter and perform steps 3b and 3c for the - output.

4) The even harmonics of the square wave are measured at 2 points, 1 kHz and 20 kHz.

Set the spectrum analyzer to measure spectrum with exponential RMS averaging, 10 averages, 6

dBV input range and dBVrms units.

5-14 Performance Tests

DS360 Ultra Low Distortion Function Generator

a) Connect the + output of the DS360 directly to the spectrum analyzers input. Set the spectrum

analyzer for a 0 to 12.5 kHz span.

b) Press

[ ] to select squarewave. 

[AMPL][1][V

RMS ]

c) Measure the amplitudes of the even harmonics (2f, 4f ...) relative to the fundamental. Record

the largest even harmonic on the test record.

d) Change the spectrum analyzer span to 0 to 100kHz.

e) Press

[FREQ][2][0][kHz]

f) Measure the amplitudes of the even harmonics relative to the fundamental. Record the largest

even harmonic on the test record.

5) This completes the harmonic distortion and noise tests.

Performance Tests 5-15

DS360 Ultra Low Distortion Function Generator

6. Waveforms

These procedures check the various output waveform characteristics.

Setup

The spectrum analyzer will be used to measure the waveform characteristicis of the noise and

2-Tone signals. The oscilloscope will be used to measure rise and fall times of the square wave.

Connect the + BNC output of the DS360 to the spectrum analyzer. Set the spectrum analyzer input to

shield grounded with AC coupling.

Procedure

1) Reset the DS360 (Turn power off, wait 2 seconds, then turn power on w/ pressed). [CLR]

2) Measure the frequency flatness of the white noise signal. Set the spectrum analyzer to exponential

RMS averaging with 500 averages at full span.

a) Press

[ ] (function down) three times to select white noise. 

[AMPL] [1] [V

RMS ]

b) Autorange the spectrum analyzer and expand the scale to 1dB.

c) Verify that the spectrum lies within 1dB. Record the results on the test record.

3) Measure the frequency flatness of the pink noise. Change the spectrum analyzer to octave

analysis.

a) Press

[ ] (function down) to select pink noise. 

[AMPL] [1] [V

RMS ]

b) Autorange the spectrum analyzer and expand the scale to 1dB.

c) Measure the amplitude for the bands from 20 Hz to 20 kHz. This will require several spans.

d) Verify that the amplitudes lie within 2dB. Record the results on the test record.

4) Measure the IMD (Inter Modulation Distortion) of the 2-Tone signal for 2 different 2-Tone

signals.

Tone 1 Tone 2 2T1 + T2 2T1 - T2 2T2 + T1 2T2 - T1

T1=1 kHz, 1V

RMS

T2=20 kHz, 0.1V

RMS

22 kHz

-----

41 kHz

39 kHz

T1=10 kHz, 1V

RMS

T2=12 kHz, 1V

RMS

32 kHz

8 kHz

34 kHz

a) Set the spectrum analyzer to measure spectrum, RMS averaging with 10 averages and dBVRMS

at full span.

5-16 Performance Tests

DS360 Ultra Low Distortion Function Generator

b) Press

[ ] (function down) to select 2-Tone. 

[FREQ] [1] [kHz]

[AMPL] [1] [V

RMS ]

[SHIFT] [T1/T2]

[FREQ] [2] [0] [kHz]

[AMPL] [.] [1] [V

RMS]

c) Span the spectrum analyzer down to measure the IMD products (2T1+T2...) for the first 2-

Tone, at the frequencies listed in the table. Record the results on the test record.

d) Press

[SHIFT] [T1/T2]

[FREQ] [1] [0] [kHz]

[AMPL] [1] [V

RMS ]

[SHIFT] [T1/T2]

[FREQ] [1] [2] [kHz]

[AMPL] [1] [V

RMS ]

d) Span the spectrum analyzer down to measure the IMD products (2T1+T2...) for the second 2-

Tone, at the frequencies listed in the table. Record the results on the test record.

5) The square wave rise time is measured using the scope.

a) Disconnect the DS360 from the spectrum analyzer. Connect the + BNC of the DS360 to CH A

of the scope. Set the scope CH A to 2 s/div, 5 V/div, with triggering on CH A. 

b) Press

[ ] (function up) until square wave is selected. 

[FREQ] [1] [0] [0] [kHz]

[AMPL] [1] [0] [V

RMS]

c) Measure the 10% - 90% rise time of the squarewave. Repeat for the fall time. Record the

results on the test record.

d) Connect the - BNC of the DS360 to the scope CH A and repeat step 5c) for the - channel.

6) This completes the waveform tests.

Performance Tests 5-17

DS360 Ultra Low Distortion Function Generator

7. Sweeps

These procedures test the flatness of frequency sweeps.

Setup

Connect the + BNC of the DS360 to CH A of the scope. Connect the SWEEP OUT BNC from the rear

panel of the DS360 to CH B of the scope. Set CH A to 1 V/div, CH B to 5V/div, the time base to 50 s/div 

and triggering on CH B.

Procedure

1) Reset the DS360 (Turn power off, wait 2 seconds, then turn power on w/ pressed). [CLR]

2) Measure the sweep flatness for a 1 Hz to 100 kHz sweep.

a) Press

[START/CENTER] [1] [Hz]

[STOP/BW] [1] [0] [0] [kHz]

[RATE] [2] [kHz]

[AMPL] [5] [V

PP ]

[SWP/BUR]

b) Expand CH A to 0.2 V/div and offset the waveform so the upper portion can be viewed.

Confirm that, excluding the first 10 s, the waveform is flat to within 50 mV PP (1/4 of a division).

Record the result on the test record located at the end of this section.

3) This completes the sweep test.

5-18 Performance Tests

DS360 Ultra Low Distortion Function Generator

8. Bursts

These tests measures the accuracy of the burst levels.

Setup

Connect the + BNC output of the DS360 the input of the spectrum analyzer. Set the spectrum analyzer to

measure spectrum with the input on AC coupling and the shield grounded. Set averaging to exponential

RMS with 10 averages. Select dBVRMS for units and set the span to 0-12.5 kHz.

Procedure

1) Reset the DS360 (Turn power off, wait 2 seconds, then turn power on w/ pressed). [CLR]

2) Press

[ ] (modify function down) until burst is selected. 

[SHIFT] [TRG SRC]

Select (external source) using the spin knob. Src. Etn

[ON/OFF] (SWP/BUR)

[AMPL] [1] [0] [V

rms ]

3) Measure the burst amplitude at depths of 100, 10, 1, 0.1 and 0%. At each depth, perform steps 3a)

and 3b).

a) Press

[SHIFT] [DEPTH] [ ] [%] depth

b) Measure and record the amplitude on the test record located at the end of this section.

4) This completes the waveform tests.

Performance Tests 5-19

DS360 Ultra Low Distortion Function Generator

9. DC Offset

These tests measure the offset accuracy of the function of the DS360.

Setup

Connect the positive output of the DS360 to the DVM. Set the DVM to DC volts, auto-ranging. Perform

any auto zeroing functions. Set the integration time long enough for 0.1% accuracy.

To make residual offset measurements it is necessary to trigger the DVM from the DS360 sync output to

average out the AC waveforms. For these measurements it is necessary to set the integration time longer

than that for normal measurements.

Procedure

1) Reset the DS360 (Turn power off, wait 2 seconds, then turn power on w/ pressed). [CLR]

2) Verify the offset linearity (DC only) at various points. For each value in the table below, perform

2b) and 2c).

Offset Voltage



20 V



2.0 V



0.2 V



0.02 V



0.002 V

a) Press

[AMPL] [0] [V

DC]

b) Press [OFFST] [ ] [Voffset DC]

c) Measure the output voltage on the DVM. Record the results on the test record.

3) Measure the residual offset (0 V) for different amplitudes. For each amplitude listed in the table

below, perform steps 3c and 3d.

Test Amplitudes

10 V

RMS

1.0 V

RMS

0.1 V

RMS

0.01 V

RMS

0.001 V

RMS

a) Connect the SYNC BNC from the DS360 to the trigger input of the DVM. Set the integration

time to at least 1 second.

b) Press

[OFFST] [0] [VDC]

FREQ] [1] [0] [2] [0] [Hz][

c) Press

[AMPL] [ ] [Vamplitude RMS ]

5-20 Performance Tests

DS360 Ultra Low Distortion Function Generator

d) Measure the output voltage on the DVM. Record the results.

4) Measure the residule offset (0 VDC) for square waves, white noise and pink noise.

a) Press

[ ] (function down) to select square waves. 

[AMPL] [1] [V

RMS ]

b) Measure the output voltage on the DVM. Record the results.

c) Disconnect the sync signal from the DS360 to the DVM. Set the integration time to the longest

possible, to ensure accurate DC measurements of the noise signals.

d) Press

[ ] (function down) to select white noise. 

[AMPL] [1] [V

RMS ]

e) Measure the output voltage on the DVM. Average 10 readings. Record the results.

f) Press

[ ] (function down) to select pink noise. 

[AMPL] [1] [V

RMS ]

g) Measure the output voltage on the DVM. Average 10 readings. Record the results.

5) This completes the offset tests.

Performance Tests 5-21

DS360 Ultra Low Distortion Function Generator

10. Output Impedance

These tests confirms the output source resistors of the DS360.

Setup

Connect the + BNC output of the DS360 to the DVM through the 50 feed through terminator. Set the 

DVM to AC volts, auto-ranging.

Procedure

1) Reset the DS360 (Turn power off, wait 2 seconds, turn power on w/ pressed). [CLR]

2) Measure the output voltage for Hi-Z output impedance and record the results on the test record.

3) Measure the output voltage for 600 (unbalanced) output impedance. 

a) Press

[SHIFT] [600]

[AMPL] [1] [V

RMS ]

b) Measure and record the output voltage on the test record.

4) Measure the output voltage for 50 (unbalanced) output impedance. 

a) Press the following keys

[SHIFT] [50]

[AMPL][1][Vrms]

b) Measure and record the output voltage on the test record.

4) Measure the output voltage for 600 (balanced) output impedance. 

a) Press the following keys

[ ] (output down) for balanced impedance. 

[SHIFT][600]

[AMPL][1][Vrms]

b) Measure and record the output voltage on the test record.

5) Measure the output voltage for 150 (balanced) out with a 50 terminator.  

a) Press the following keys

[SHIFT][150]

[AMPL][1][Vrms]

b) Measure and record the output voltage on the test record.

5-22 Performance Tests

DS360 Ultra Low Distortion Function Generator

7) Disconnect the + BNC output from the DVM. Connect the - BNC output to the DVM. Repeat

steps 1 through 5.

8) Confirm the output on/off function operates

a) Press

(output on/off) [ON/OFF]

b) Confirm that the DVM reads 0 (or nearly zero).

9) This completes the offset tests.

Performance Tests 5-23

DS360 Ultra Low Distortion Function Generator

DS360 Performance Test Record Page 1 of 4

Serial Number _________________ Tested By _______________________

Firmware Revision _____________ Date ___________________________

Equipment Used ____________________________________________________________________

____________________________________________________________________

1. Front Panel

Test Pass Fail

Display ____ ____

Keypad ____ ____

Knob ____ ____

2. Self Test

Test Pass Fail

Self Tests ____ ____

3. Frequency

Set Value Lower Limit Frequency Upper Limit

100.000 kHz 99.9975 kHz ________ 100.0025 kHz

4. Amplitude Accuracy

Unbalanced Set Voltage Lower Limit + Output Upper Limit

Attenuator Test 14.0 VRMS 13.86 VRMS _______ 14.14 VRMS

12.0 VRMS 11.88 VRMS _______ 12.12 VRMS

10.0 VRMS 9.90 VRMS _______ 10.10 VRMS

7.0 VRMS 6.93 VRMS _______ 7.07 VRMS

4.0 VRMS 3.96 VRMS _______ 4.04 VRMS

0.40 VRMS 0.396 VRMS _______ 0.404 VRMS

0.04 VRMS 0.0396 VRMS _______ 0.0404 VRMS

0.004 VRMS 0.00396 VRMS _______ 0.00404 VRMS

0.00125 VRMS 0.001238 VRMS _______ 0.001263 VRMS

Balanced Attenuator Test Set Voltage Lower Limit Output Upper Limit

8.0 VRMS 7.92 VRMS _______ 8.08 VRMS

0.80 VRMS 0.792 VRMS _______ 0.808 VRMS

0.08 VRMS 0.0792 VRMS _______ 0.0808 VRMS

0.008 VRMS 0.00792 VRMS _______ 0.00808 VRMS

Sinewave Flatness Frequency Lower Limit Output Upper Limit

10 Hz 0.99 VRMS _______ 1.01 VRMS

20 Hz 0.99 VRMS _______ 1.01 VRMS

50 Hz 0.99 VRMS _______ 1.01 VRMS

100 Hz 0.99 VRMS _______ 1.01 VRMS

200 Hz 0.99 VRMS _______ 1.01 VRMS

500 Hz 0.99 VRMS _______ 1.01 VRMS

5-24 Performance Tests

DS360 Ultra Low Distortion Function Generator

DS360 Performance Test Record Page 2 of 4

4. Amplitude Accuracy (Continued)

1.0 kHz 0.99 VRMS _______ 1.01 VRMS

2.0 kHz 0.99 VRMS _______ 1.01 VRMS

5.0 kHz 0.99 VRMS _______ 1.01 VRMS

10 kHz 0.99 VRMS _______ 1.01 VRMS

20 kHz 0.99 VRMS _______ 1.01 VRMS

50 kHz 0.99 VRMS _______ 1.01 VRMS

100 kHz 0.99 VRMS _______ 1.01 VRMS

200 kHz 0.99 VRMS _______ 1.01 VRMS

Antialaising Filter Amplitude Frequency Lower Limit Output Upper Limit

10 Hz 0.99 VRMS _______ 1.01 VRMS

20 Hz 0.99 VRMS _______ 1.01 VRMS

50 Hz 0.99 VRMS _______ 1.01 VRMS

100 Hz 0.99 VRMS _______ 1.01 VRMS

200 Hz 0.99 VRMS _______ 1.01 VRMS

500 Hz 0.99 VRMS _______ 1.01 VRMS

1.0 kHz 0.99 VRMS _______ 1.01 VRMS

2.0 kHz 0.99 VRMS _______ 1.01 VRMS

5.0 kHz 0.99 VRMS _______ 1.01 VRMS

10 kHz 0.99 VRMS _______ 1.01 VRMS

20 kHz 0.99 VRMS _______ 1.01 VRMS

50 kHz 0.99 VRMS _______ 1.01 VRMS

100 kHz 0.99 VRMS _______ 1.01 VRMS

200 kHz 0.99 VRMS _______ 1.01 VRMS

Squarewave Amplitude Frequency Amplitude Lower Limit Output Upper Limit

100 Hz 2 VPP 1.98 VPP ______ 2.02 VPP

0.99 VRMS ______ 1.01 VRMS

Squarewave Flatness Frequency Output Frequency Output

10 Hz _______ 2.0 kHz _______

20 Hz _______ 5.0 kHz _______

50 Hz _______ 10 kHz _______

100 Hz _______ 20 kHz _______

200 Hz _______ 50 kHz _______

500 Hz _______ 100 kHz _______

1.0 kHz _______ 200 kHz _______

Flatness Calculation Min Outout ________ Max Output ________

Lower Limit Upper Limit

Flatness 99% ________ 101%

Noise Amplitude Amplitude Lower Limit Output Upper Limit

White Noise 1.00 VRMS 0.98 VRMS _________ 1.02 VRMS

Pink Noise 1.00 VRMS 0.96 VRMS _________ 1.04 VRMS

Performance Tests 5-25

DS360 Ultra Low Distortion Function Generator

DS360 Performance Test Record Page 3 of 4

5. Harmonic Distortion

Sine Wave Frequency Amplitude + Output - Output Upper Limit

Distortion 1 kHz 1.0 VRMS _______ _______ -106 dB

1 kHz 10.0 VRMS _______ _______ -105 dB

11 kHz 1.0 VRMS _______ _______ -98 dB

11 kHz 10.0 VRMS _______ _______ -98 dB

31 kHz 1.0 VRMS _______ _______ -96 dB

31 kHz 10.0 VRMS _______ _______ -93 dB

Sinewave Frequency Amplitude + Output - Output Upper Limit

Broad Band Noise 1 kHz 1.0 VRMS _______ _______ 150 nV Hz 

1 kHz 10.0 VRMS _______ _______ 150 nV Hz 

11 kHz 1.0 VRMS _______ _______ 150 nV Hz 

11 kHz 10.0 VRMS _______ _______ 150 nV Hz 

31 kHz 1.0 VRMS _______ _______ 150 nV Hz 

31 kHz 10.0 VRMS _______ _______ 150 nV Hz 

Square Wave Frequency Amplitude Max Even Upper Limit

Even Harmonics 1 kHz 1.0 VRMS _______ -60 dB

20 kHz 1.0 VRMS _______ -60 dB

6. Waveform

Noise Flatness Upper Limit

White Noise ________ 1 dB

Pink Noise ________ 2 dB

2-Tone IMD

T1 T2 2T1+T2 2T1-T2 2T2+T1 2T2-T1 Upper Limit

1k,1V 20k,1V ________ ----- ________ ________ -80dB

10k,1V 12k,1V ________ ________ ________ ________ -80dB

Square Wave Tr, Tf Frequency Amplitude Rise Time Fall Time Upper Limit

+ Output 100 kHz 10 VRMS ________ ________ 1.3 s 

- Output 100 kHz 10 VRMS ________ ________ 1.3 s 

7. Sweeps

Sweep Flatness Upper Limit

________ 50 mVPP

8. Bursts

Off Level Lower Limit Amplitude Upper Limit

100% 19.0 dBVRMS ________ 21.0 dBVRMS

10 % -1.0 dBVRMS ________ +1.0 dBVRMS

1 % -21.0 dBVRMS ________ -19.0 dBVRMS

0.1 % -42.0 dBVRMS ________ -38.0 dBVRMS

0.0 % ------ ________ -60 dBVRMS

5-26 Performance Tests

DS360 Ultra Low Distortion Function Generator

DS360 Performance Test Record Page 4 of 4

9. DC Offset

Offset Linearity Set Value |Lower Limit| Offset |Upper Limit|

+20 VDC 19.775 VDC ________ 20.225 VDC

+2.0 1.955 VDC ________ 2.045 VDC

+0.2 0.1955 VDC ________ 0.2045 VDC

+0.02 19.55 mVDC ________ 20.45 mVDC

+0.002 1.93 mVDC ________ 2.07 mVDC

-20 VDC -19.775 VDC ________ -20.225 VDC

-2.0 -1.955 VDC ________ -2.045 VDC

-0.2 -0.1955 VDC ________ -0.2045 VDC

-0.02 -19.55 mVDC ________ -20.45 mVDC

-0.002 -1.93 mVDC ________ -2.07 mVDC

Waveform Amplitude Lower Limit Offset Upper Limit

Sine 10 VRMS -25 mVDC ________ +25 mVDC

Sine 1.0 VRMS -25 mVDC ________ +25 mVDC

Sine 0.10 VRMS -2.5 mVDC ________ +2.5 mVDC

Sine 0.010 VRMS -250 µVDC ________ +250 µVDC

Sine 0.001 VRMS - 50 µVDC ________ +50 µVDC

Square 1.0 VRMS -25 mVDC ________ +25 mVDC

White Noise 1.0 VRMS -25 mVDC ________ +25 mVDC

Pink Noise 1.0 VRMS -300 mVDC ________ +300 mVDC

10. Output Impedance

Impedance Amplitude Lower Limit + Output Upper Limit

Hi-Z 1.0 VRMS 0.632 VRMS ________ 0.701 VRMS

600 Unbal 1.0 VRMS 0.151 VRMS ________ 0.157 VRMS

50 Unbal 1.0 VRMS 0.958 VRMS ________ 1.040 VRMS

600 Bal 1.0 VRMS 0.140 VRMS ________ 0.145 VRMS

150 Bal 1.0 VRMS 0.387 VRMS ________ 0.413 VRMS

Output On/Off Pass ________

Circuit Description 6-1

DS360 Ultra Low Distortion Function Generator

Chapter 6

Circuit Description

This chapter provides descriptions of the circuitry of the DS360. Each boards description and function is

discussed. The schematics and parts list are shown at the end of the chapter.

In this Chapter

Overview 6-3

Digital Board Description 6-3

DSP and Control Logic 6-3

Burst Control 6-3

Microprocessor and System Clocks 6-4

Front Panel Control 6-5

GPIB and RS232 6-5

Power Supply 6-5

Analog Board Description 7-6

Digital-Analog Interface 6-6

Waveform Generation 6-6

Distortion Reduction Filters 6-6

Amplitude and Offset Control 6-7

Output Amplifier 6-7

Attenuators and Source Resistors 6-8

Power Supply 6-8

Front Panel Description 6-9

Display Board 6-9

Output Board 6-9

Programmable Resistor Board 6-9

Digital Board Parts List 6-11

Analog Board Parts List 6-15

Front Panel Parts List 6-27

Distortion Filter Parts List 6-31

Miscellaneous and Chassis Parts List 6-32

Digital Board Schematics DIG-1 to DIG-7

Analog Board Schematics ANA-1 to ANA-7

Front Panel Schematics FP-1 and FP-2

Programmable Resistor Board Schematics PROGR1

Circuit Description

DS360 Ultra Low Distortion Function Generator

6-2

Circuit Description

DS360 Ultra Low Distortion Function Generator

6-3

Overview

The DS360’s circuitry is divided into two major sections: the digital section and the

analog section. The digital section contains the controlling microprocessor,

communications interfaces, front panel control and digital signal processor. The analog

section contains the analog to digital converter, waveform conditioning circuitry,

amplifiers and attenuators. In addition there are four other boards: the front panel display

board, the front panel output board and two switchable resistor boards.

Digital Board

This section covers schematics DIG-1 through DIG-7 at the end of this section.

The digital board contains the main CPU, system memory, external interfaces including

the front panel, RS-232 and GPIB, the digital signal processor and its memory, timing

and control logic and the digital power supply.

DSP and Control Logic

U101 is a Motorola DSP56002FC40, a 24 bit fixed point, digital signal processor. It is

capable of performing a multiply and two register moves in a single 53 ns cycle. The

DSP56002 has 512 words of internal data RAM, and 512 words of program RAM. There

is also two internal ROM tables, a 256 word sine table and a 256 word A/Mu Law table

(not used in the DS360). There is a single external data bus, which is multiplexed into

three sections, X and Y data memory and P program memory. U102, U103 and U104

(32k * 8) make up the DSP memory. U114 segments the memory into the X, Y, and P

sections.

The DSP56002 contains an internal PLL (phase lock loop) that multiplies the system

clock (see DIG-4) of 5.3 MHz up to 18.9 MHz internally. Communications with the main

processor take place via the Host Port (U101 H0-H7, HA0-HA2, HR/W, HEN).

Data is sent from the DSP to the D/A converter through parallel to serial converters

(U105-U107) (74HC597), on the DSP memory bus. These signals are synchronized to

the system clock before passing to the analog board through J101. U111 and U112

generate the data clocking and frame sync signals.

U109 generates output control signals from the DSP data and address lines. U115 and

U116 synchronize status information to the output data. U110 generates clocking and

sync signals for the digital output. Communications between the DSP56002 and digital

output are via the serial output (STD, SCK) and the U108 port.

Burst Control

U301 and U302 are PAL’s that generates the rate and width clocking signals for the

synchronous bursts. U303 (8254) is a triple 16 bit counter used to generate burst rates,

burst widths and clocking for noise signals. U306 and U307 (74HC74) are used to

synchronize external events to the burst clock. U308 contains all of the processor control

signals for bursts.

Circuit Description

DS360 Ultra Low Distortion Function Generator

6-4

Microprocessor and System Clocks

U401 is a Z80 general purpose microprocessor. It is clocked at 10.6 MHz, generated

from the main system clock. The 16 bit address space (A0-A15), is divided into ROM

(U402) and RAM (U403) by U413. The memory map for ROM and RAM is as follows:

ROM $0000 to $CFFF

RAM $D000 to $FFFF

U407 (74HC154) generates all chip selects for the system. U404 and U406 are system

status and control ports, respectively. U416 is the digital output control port (for U201).

U415-A or’s together all of interrupt signals to generate the maskable interrupt to the

Z80.

U405 (8254) is a triple 16 bit counter, used to generate the real time clock (1.67 ms), set

the RS232 baud rate (for U604) and speaker tones (for SP401). The baud rate can range

from 300 to 19.2k baud. D401, D402, and BT101 provide the battery backup to the

system RAM (U403). Q402, Q403 and associated resistors and capacitors generate the

power on reset and power fail shut down.

U408 is a 32.333 MHz 25 ppm oscillator. It is buffered by U411 to three different paths,

the system clocks, DSP control logic and D/A sync control. This is to avoid any signal

contamination due to reflections or load variations. The main clock is divided down by

U409 and U410 to provide the different system clocks.

Circuit Description

DS360 Ultra Low Distortion Function Generator

6-5

Front Panel Control

The front panel display board consists of eight 7 segment displays and 50 discrete LEDs.

They are arranged into eight groups, each driven by a strobe line. U501 and U502 are the

latch and drivers for the strobes. U503 and N501 are pull down latches and current

limiting resistors for the seven segment displays. U505, U506, N504, R502 and R503 are

latches, pull down transistors and current limiting resistors for the discrete LED’s. U507

is the keypad input. U508 and U509 decode the direction that the knob is turning and

generate the knob interrupt to the main processor. U504 (74HC4538) acts as a watchdog

timer, shutting off the LEDs if the processor stops working.

GPIB & RS232

The GPIB (IEEE-488) interface is provided by U601, a NAT9914 controller. U602

(75160A) and U603 (75161A) buffer the data and control lines to the GPIB connector.

U601 is programmed to provide an interrupt to the processor whenever there is bus

activity addressed to the unit.

The 8251 UART (U604) provides all the UART functions, except the baud rate

(generated by U405). U605 (MAX202) provides level shifting and buffering for

incoming and outgoing data. U604 generates an interrupt whenever there is activity over

the RS232 interface.

The RS232 port is a DCE and may be connected to a PC using a standard serial cable

(not a “null modem” cable).

Power Supply

CAUTION

Dangerous voltages are present on the printed circuit board when the instrument is

attached to the power source, even if the unit is turned off! Always wait at least one

minute after removing the power before opening the unit.

The power entry module provides a connection to the power source, fuses the line,

selects the line voltage and filters out high frequencies noise. SW701 switches the line

and neutral. Transformer T701 provides all low voltage power to both the digital and

analog boards.

D701 and D702 rectify the low AC voltage for the digital section. U701 (LM7805) is a

three terminal regulator that provides +5 VDC for most of the digital circuitry. U702

(LM7805) provides +5 VDC for the LEDs and displays. U703 (LM317L) provides +7 VDC

for the cooling fan.

Circuit Description

DS360 Ultra Low Distortion Function Generator

6-6

Analog Board

This section covers schematics ANA-1 through ANA-7 at the end of this chapter.

The analog board contains the interface logic to the digital board, the waveform DAC, all

signal conditioning circuitry, attenuators, amplifiers and analog power supplies.

Digital - Analog Interface

U101, U102 and U103 (HCPL-7100) are low jitter opto-isolators that transmit the serial

waveform data from the DSP to the waveform DAC. The interface consists of the data,

clock for the data, and a frame sync signal to load the DAC.

U106, U107 and U108 (6N137) are opto-isolators that transmit control signals from the

main processor to the analog board. 16 bits of data is clocked into shift registers U109

and U110 (74HC164) whenever any parameter is changed on the analog board. The three

highest bits (first 3 bits clocked in) go to U111 (74HC138), which provides chip selects

for the various devices.

U112 (6N137) is used to control the burst logic. U114 (HCPL-7100) is the sync signal

that is used on the digital board.

Waveform Generation

The waveform DAC is used to generate all output waveforms. To generate sine waves,

white noise, sweeps or 2-Tones, relay K201 selects the output of the anti-imaging filter

directly. For pink noise, the waveform DAC generates white noise, which is filtered into

pink noise by U207 (LF357) and its associated resistors and capacitors. Relay K201 then

selects the output of U207. Square waves are generated by using a comparator to sense

zero crossings of a sine wave. They are switched into the circuit on ANA-4.

The waveform DAC is an Analog Devices AD1862-J, a 20 bit, ultra low distortion DAC,

capable of generating a sinewave with < -100dBc THD (total harmonic distortion). U202

(AD797) is its associated current to voltage converter. They feed a seventh order Cauer

anti-imaging filter which filters out any out of band frequency components.

The heart of the square wave and sync generator is the high speed analog comparator,

U209 (LT1016). The sine wave is buffered and amplified by U208A (LF412) to ensure

that the comparator operates over all input signal levels. Low frequency hysteresis is

provided by U210 (LM311) and U113A. High frequency hysteresis is provided by C222.

The output of the LT1016 is raised to full TTL (0 to +5 V

DC) by U113B. When selected

by relay K202, this signal is amplified by U208B (LF412) to ±6.5 V

PP.

P201 is the low frequency square wave phase adjust that sets the square wave symmetry.

C225 controls the rise time of the square wave.

Distortion Reduction Filters

There are two cascaded programmable distortion reduction filters. These operate by

attenuating the distortion products (2 * F

o, 3 * Fo ...) without affecting the fundamental

Circuit Description

DS360 Ultra Low Distortion Function Generator

6-7

signal. Each filter is a second order, state variable, low pass filter. J301 and J302 are

connected to switchable resistor networks.

The filters are programmed within a decade by varying the resistors on J301 and J302.

There are 9 steps per decade, set by R0 - R5 (U309). Decades are set by changing

capacitors C301 - C304 and C317 - C320 with relays K301, K302, K304, K305. The

resistor and capacitor settings are always the same for both filters.

The filters can be bypassed for certain situations by relay K303. U308 provides

additional gain before the signal passes through the attenuators.

Amplitude and Offset Control

U401, U402, U403 and U404 is the burst circuitry. When bursts are active, the dual DAC

U401 (AD7549) sets the “on” and “off” levels for bursts. U403 A and B (OP-275) are

current to voltage converters for U401. U404 (DG444) selects between the two levels,

based on a signal from the digital board. U402 (OP-275) acts as input and output buffers.

P401 removes any DC offset voltage between the “on” and “off” levels.

Relay K407 selects either square waves or all other signals. Relay K405 switches the

burst DACs in or out.

Relays K401, K402, K403, K404, K406 and their associated resistors make up a 1 kΩ

pre-attenuator chain. All or none of the attenuators may be switched in, depending on the

output amplitude.

U405 (REF02) is a low drift +5.00 V

DC reference. Its output is filtered by L401 and C404

to reduce its output noise. DAC U406 (AD7542) and U407 (NE5532) set the offset

voltage from -5.00 to +5.00 V

DC.

Output Amplifiers

There are two independent output amplifiers. Each has a separate pre-amplifier. U501

(AD797) provides a gain of +1.6 to the upper amplifier. U504 (AD797) provides a gain

of -1.6 to the lower amplifier. P506 is used to balance the upper and lower amplifiers.

U502 and U505 (NE5534) provide a low frequency DC stabilization loop for the two

output amplifiers. They adjust the non-inverting inputs of the output amplifiers to

maintain the correct DC voltage at the outputs. P503 balances the DC output voltage

between the two.

Discrete Amplifiers

The two amplifiers are identical. For simplicity’s sake, only the upper amplifier will be

described.

The output amplifiers are essentially discrete op-amps. U503-5 is the inverting input,

U503-2 is the non-inverting input and the junction between R527 and R528 is the output.

The amplifiers are connected in an inverting configuration, with R507 the input resistor,

and R511 and P501 the feedback resistor. The non-inverting input is grounded through

R515. C503 provides feedback compensation, to prevent oscillations.

U503 (MAT-02) is a dual, low noise transistor, that is used as a differential amplifier.

Q505 is a current source, which draws a constant 1.6 mA (0.8 mA through each leg of

Circuit Description

DS360 Ultra Low Distortion Function Generator

6-8

U503). Q503, Q504 and Q506 are configured as a cascode, to maintain a constant

voltage across U503. Q501 and Q502 are active collector loads for U503 A and B. Q507

provides a low impedance source to Q508, which provides most of the voltage gain. It is

biased at 3.5 mA by Q509.

Output transistors Q512 and Q513 are configured as a class B amplifier (push-pull).

However, Q510 and Q511 bias them slightly on, to reduce crossover distortion. P502 sets

the bias current through Q512 and Q513.

Output Attenuators and Source Resistance

Relay K601 can select the + and - signals for normal operation, or ground for switching

the outputs off. Relays K602, K603 and K604 select output attenuation of 0dB, 20dB,

40dB or 60dB for both the + and - outputs. The attenuator chain has an output resistance

of 25Ω. Relays K605, K606 and K607 select an additional resistance, that together with

the attenuator output resistance, provides the desired source resistance.

U601, U603, U606, U608, U610 are latches for most of the relays in the analog section.

U602, U604, U605, U607, U609, Q601, Q602 and Q603 are drivers for all relays. All

relays are latching type, so the drivers output a brief +5 V pulse (~4 ms) to set or clear

each relay.

Power Supply

The analog board is floating relative to the chassis or the digital board. It is AC coupled

to ground through C790-C796 and R705 on the analog board. There is additional

coupling on the output board.

J701 brings power from the main transformer to the analog board. D701, D702 rectify

the AC voltages into unregulated DC voltages that are filtered by C703-C706 and C719-

C722. U701 (LM317) and U702 (LM337) are adjustable voltage regulators, programmed

for ±28 VDC. L701-L704 and C711-C718 provide high frequency filtering for the output

voltage. U703 (LM7815) and U704 (LM7915) are fixed ±15 V

DC voltage regulators.

Their outputs are filtered by L705-L708 and C725-C732.

U705 (LM7805) provides +5 V

DC to most of the logic circuitry on the analog board.

U709 (LM7805) and U707 (LM7905) provide ±5 V

DC to the square wave circuitry. R706

and R707 are dropping resistors, to minimize the power dissipated in U709 and U707.

U706 (LM78L12) and U708 (LM79L12) provide power to the waveform DAC.

C741-C749 are bypass capacitors for the +5 V logic (U705). C755-C759 are bypass for

the square wave +5 V (U709). C770-C775 are bypass for +28 V. C780-C785 are bypass

for -28 V. C776-C777 are bypass for +15 V. C786-C787 are bypass for -15 V.

Circuit Description 6-9

DS360 Ultra Low Distortion Function Generator

Front Panel

This section covers schematic FP-1 and FP-2 at the end of this chapter.

Display Board

The front panel display board consists of eight 7 segment displays, 50 discrete LEDs, the

keypad and the spin knob.

The front panel uses a a multiplexed scheme to minimize the number of conductors

required to drive it. The 7 segment displays and LEDs are divided into eight sections,

each driven by a strobe line. All of the displays share a common pull down (Da-Dg, Ddp)

and the LEDs have 7 shared pull downs (LED0-LED6). When a strobe line is hi, that

display is active, with the displayed segments detirmined by the display pulldowns. The

LEDs that share that strobe line are also active, controlled by the LED pulldowns. This is

repeated for each of the strobes in turn.

While a strobe line is high, the keyboard port (KEY0-KEY4) is able to read the keys on

that strobe.

The spin knob is an optical encoder. Each transition of its quadrature outputs is clocked

into circuitry on the digital board. The main processor keeps track of the knobs direction

and speed.

Output Board

The output board provides connections and filtering for the front panel outputs on the

DS360. The + output and - output are brought from the analog board on RG174 cable.

There is additional coupling from the analog board common to the chassis ground on this

board from R1 and C5-C8.

Programmable Resistor Board

This section covers schematic PROGR-1 at the end of this chapter.

This board is a dual programmable resistor. Individule resistors are selected by control

lines R0-R5. Any combination of resistors can be selected (32 possibilities), however

only nine of them are use in the DS360 (R5, R4, R3, R2, R1, R0, R0+R5, R1+R2+R3,

R1+R2+R3+R5). Each half of the circuit is always set to the same value. Two of the

programmable resistor boards are used in each unit.

Circuit Description

DS360 Ultra Low Distortion Function Generator

6-10

Parts List

DS360 Ultra Low Distortion Function Generator

6-11

Digital Board Parts List

This section covers schematics DIG-1 through DIG-7.

Digital Board Assembly

Ref No. SRS Part No. Value Component Description

BT401 6-00001-612 BR-2/3A 2PIN PC Battery

C 101 5-00017-501 47P Capacitor, Ceramic Disc, 50V, 10%, SL

C 102 5-00017-501 47P Capacitor, Ceramic Disc, 50V, 10%, SL

C 103 5-00017-501 47P Capacitor, Ceramic Disc, 50V, 10%, SL

C 104 5-00063-513 .0033U Capacitor, Mylar/Poly, 50V, 5%, Rad

C 204 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 205 5-00064-513 .0047U Capacitor, Mylar/Poly, 50V, 5%, Rad

C 206 5-00002-501 100P Capacitor, Ceramic Disc, 50V, 10%, SL

C 207 5-00002-501 100P Capacitor, Ceramic Disc, 50V, 10%, SL

C 208 5-00002-501 100P Capacitor, Ceramic Disc, 50V, 10%, SL

C 209 5-00062-513 .0022U Capacitor, Mylar/Poly, 50V, 5%, Rad

C 301 5-00061-513 .001U Capacitor, Mylar/Poly, 50V, 5%, Rad

C 401 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 402 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 403 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad

C 407 5-00040-509 1.0U Capacitor, Electrolytic, 50V, 20%, Rad

C 408 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U

C 409 5-00034-526 100U Capacitor, Electrolytic, 35V, 20%, Rad

C 501 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 601 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U

C 602 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U

C 603 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U

C 604 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 605 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U

C 701 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U

C 702 5-00258-520 15000U Capacitor, Electrolytic, 16V, 20%, Rad

C 703 5-00192-542 22U MIN Cap, Mini Electrolytic, 50V, 20% Radial

C 704 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad

C 705 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad

C 706 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 707 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 708 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 709 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 710 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 711 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 712 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 713 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 714 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 715 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 716 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 717 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 718 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 719 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 720 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 721 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

Parts List

DS360 Ultra Low Distortion Function Generator

6-12

C 722 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 723 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 724 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 725 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 726 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 727 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 728 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 729 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 730 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 731 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 732 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 733 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 734 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 735 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 736 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 737 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 738 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 739 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 740 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 741 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 742 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 743 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 744 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 745 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 746 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 747 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 748 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 749 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 750 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 770 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 771 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 772 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 773 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 774 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

D 401 3-00004-301 1N4148 Diode

D 402 3-00004-301 1N4148 Diode

D 403 3-00004-301 1N4148 Diode

D 701 3-00001-301 1N4001 Diode

D 702 3-00001-301 1N4001 Diode

J 201 0-00388-000 RCA PHONO Hardware, Misc.

J 204 1-00233-120 RT ANGLE Connector, BNC

J 205 1-00233-120 RT ANGLE Connector, BNC

J 401 1-00086-130 3 PIN SI Connector, Male

J 501 1-00171-130 34 PIN ELH Connector, Male

J 601 1-00160-162 IEEE488/STAND. Connector, IEEE488, Standard, R/A, Femal

J 602 1-00016-160 RS232 25 PIN D Connector, D-Sub, Right Angle PC, Female

J 701 1-00260-116 4 PIN, WHITE Header, Amp, MTA-156

JP401 1-00087-131 2 PIN JUMPER Connector, Female

L 401 6-00114-603 1.0MH Inductor, Axial

N 101 4-00878-421 82X3 Res. Network, SIP, 1/4W,2% (Isolated)

N 102 4-00878-421 82X3 Res. Network, SIP, 1/4W,2% (Isolated)

N 103 4-00334-425 10KX5 Resistor Network SIP 1/4W 2% (Common)

Parts List

DS360 Ultra Low Distortion Function Generator

6-13

N 104 4-00334-425 10KX5 Resistor Network SIP 1/4W 2% (Common)

N 501 4-00420-420 390X8 Resistor Network, DIP, 1/4W,2%,8 Ind

N 502 4-00468-420 300X8 Resistor Network, DIP, 1/4W,2%,8 Ind

N 503 4-00338-425 2.0KX5 Resistor Network SIP 1/4W 2% (Common)

N 504 4-00673-421 12X5 Res. Network, SIP, 1/4W,2% (Isolated)

P 201 4-00915-440 200 Trim Pot, Single Turn, In-Line Leads

PC1 7-00474-701 DS360 DIG Printed Circuit Board

Q 401 3-00140-325 2N2369A Transistor, TO-92 Package

Q 403 3-00021-325 2N3904 Transistor, TO-92 Package

R 101 4-00141-407 100 Resistor, Metal Film, 1/8W, 1%, 50PPM

R 203 4-00021-401 1.0K Resistor, Carbon Film, 1/4W, 5%

R 204 4-00034-401 10K Resistor, Carbon Film, 1/4W, 5%

R 205 4-00021-401 1.0K Resistor, Carbon Film, 1/4W, 5%

R 206 4-00053-401 200 Resistor, Carbon Film, 1/4W, 5%

R 207 4-00053-401 200 Resistor, Carbon Film, 1/4W, 5%

R 208 4-00053-401 200 Resistor, Carbon Film, 1/4W, 5%

R 301 4-00021-401 1.0K Resistor, Carbon Film, 1/4W, 5%

R 401 4-00021-401 1.0K Resistor, Carbon Film, 1/4W, 5%

R 402 4-00034-401 10K Resistor, Carbon Film, 1/4W, 5%

R 403 4-00079-401 4.7K Resistor, Carbon Film, 1/4W, 5%

R 406 4-00034-401 10K Resistor, Carbon Film, 1/4W, 5%

R 407 4-00054-401 200K Resistor, Carbon Film, 1/4W, 5%

R 408 4-00065-401 3.3K Resistor, Carbon Film, 1/4W, 5%

R 409 4-00080-401 47 Resistor, Carbon Film, 1/4W, 5%

R 410 4-00079-401 4.7K Resistor, Carbon Film, 1/4W, 5%

R 501 4-00032-401 100K Resistor, Carbon Film, 1/4W, 5%

R 502 4-00314-401 12 Resistor, Carbon Film, 1/4W, 5%

R 503 4-00314-401 12 Resistor, Carbon Film, 1/4W, 5%

R 601 4-00021-401 1.0K Resistor, Carbon Film, 1/4W, 5%

R 602 4-00034-401 10K Resistor, Carbon Film, 1/4W, 5%

R 603 4-00034-401 10K Resistor, Carbon Film, 1/4W, 5%

R 604 4-00034-401 10K Resistor, Carbon Film, 1/4W, 5%

R 701 4-00141-407 100 Resistor, Metal Film, 1/8W, 1%, 50PPM

R 702 4-00580-407 475 Resistor, Metal Film, 1/8W, 1%, 50PPM

SO402 1-00026-150 28 PIN 600 MIL Socket, THRU-HOLE

SP401 6-00096-600 MINI Misc. Components

SW701 2-00023-218 DPDT Switch, Panel Mount, Power, Rocker

U 101 3-00611-360 DSP56002FC-40 Integrated Circuit (Surface Mount Pkg)

U 102 3-01116-341 71256SA20TP STATIC RAM, I.C.

U 103 3-01116-341 71256SA20TP STATIC RAM, I.C.

U 104 3-01116-341 71256SA20TP STATIC RAM, I.C.

U 105 3-00488-340 74HC597 Integrated Circuit (Thru-hole Pkg)

U 106 3-00488-340 74HC597 Integrated Circuit (Thru-hole Pkg)

U 107 3-00488-340 74HC597 Integrated Circuit (Thru-hole Pkg)

U 109 3-00405-343 16V8-15 GAL/PAL, I.C.

U 111 3-00703-343 DS360/U111 GAL/PAL, I.C.

U 112 3-00707-343 DS360/U112 GAL/PAL, I.C.

U 113 3-00045-340 74HC32 Integrated Circuit (Thru-hole Pkg)

U 114 3-00704-343 DS360/U114 GAL/PAL, I.C.

U 115 3-00049-340 74HC74 Integrated Circuit (Thru-hole Pkg)

U 116 3-00049-340 74HC74 Integrated Circuit (Thru-hole Pkg)

U 117 3-00036-340 74HC00 Integrated Circuit (Thru-hole Pkg)

Parts List

DS360 Ultra Low Distortion Function Generator

6-14

U 118 3-00049-340 74HC74 Integrated Circuit (Thru-hole Pkg)

U 119 3-00274-340 74AC74 Integrated Circuit (Thru-hole Pkg)

U 207 3-00155-340 74HC04 Integrated Circuit (Thru-hole Pkg)

U 208 3-00039-340 74HC14 Integrated Circuit (Thru-hole Pkg)

U 210 3-00165-340 74HC08 Integrated Circuit (Thru-hole Pkg)

U 301 3-00705-343 DS360/U301A GAL/PAL, I.C.

U 302 3-00706-343 DS360/U302 GAL/PAL, I.C.

U 303 3-00492-340 UPD71054C-10 Integrated Circuit (Thru-hole Pkg)

U 304 3-00046-340 74HC374 Integrated Circuit (Thru-hole Pkg)

U 305 3-00049-340 74HC74 Integrated Circuit (Thru-hole Pkg)

U 306 3-00049-340 74HC74 Integrated Circuit (Thru-hole Pkg)

U 307 3-00199-340 74HC4538 Integrated Circuit (Thru-hole Pkg)

U 401 3-00298-340 Z84C0008PEC Integrated Circuit (Thru-hole Pkg)

U 403 3-00299-341 32KX8-70L STATIC RAM, I.C.

U 404 3-00044-340 74HC244 Integrated Circuit (Thru-hole Pkg)

U 405 3-00492-340 UPD71054C-10 Integrated Circuit (Thru-hole Pkg)

U 406 3-00046-340 74HC374 Integrated Circuit (Thru-hole Pkg)

U 407 3-00158-340 74HC154N Integrated Circuit (Thru-hole Pkg)

U 408 6-00191-621 32.333 MHZ Crystal Oscillator

U 409 3-00404-340 74HC107 Integrated Circuit (Thru-hole Pkg)

U 410 3-00049-340 74HC74 Integrated Circuit (Thru-hole Pkg)

U 411 3-00155-340 74HC04 Integrated Circuit (Thru-hole Pkg)

U 412 3-00039-340 74HC14 Integrated Circuit (Thru-hole Pkg)

U 413 3-00700-343 DS360/U413 GAL/PAL, I.C.

U 414 3-00155-340 74HC04 Integrated Circuit (Thru-hole Pkg)

U 415 3-00348-340 74HC20 Integrated Circuit (Thru-hole Pkg)

U 501 3-00046-340 74HC374 Integrated Circuit (Thru-hole Pkg)

U 502 3-00278-340 UDN2585A Integrated Circuit (Thru-hole Pkg)

U 503 3-00046-340 74HC374 Integrated Circuit (Thru-hole Pkg)

U 504 3-00199-340 74HC4538 Integrated Circuit (Thru-hole Pkg)

U 505 3-00046-340 74HC374 Integrated Circuit (Thru-hole Pkg)

U 506 3-00064-340 CA3081 Integrated Circuit (Thru-hole Pkg)

U 507 3-00044-340 74HC244 Integrated Circuit (Thru-hole Pkg)

U 508 3-00049-340 74HC74 Integrated Circuit (Thru-hole Pkg)

U 509 3-00049-340 74HC74 Integrated Circuit (Thru-hole Pkg)

U 510 3-00039-340 74HC14 Integrated Circuit (Thru-hole Pkg)

U 601 3-00645-340 NAT9914BPD Integrated Circuit (Thru-hole Pkg)

U 602 3-00078-340 DS75160A Integrated Circuit (Thru-hole Pkg)

U 603 3-00079-340 DS75161A Integrated Circuit (Thru-hole Pkg)

U 604 3-00493-340 UPD71051C Integrated Circuit (Thru-hole Pkg)

U 605 3-00605-340 MAX202 Integrated Circuit (Thru-hole Pkg)

U 703 3-00096-340 LM317L Integrated Circuit (Thru-hole Pkg)

UZ409 0-00772-000 1.5" WIRE Hardware, Misc.

Z 0 0-00089-033 4" Tie

Z 0 0-00165-003 TO-18 Insulators

Parts List

DS360 Ultra Low Distortion Function Generator

6-15

)Analog Board Parts List

This section covers schematics ANA-1 through ANA-7.

Analog Board Assembly

Ref No. SRS Part No. Value Component Description

C 101 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 102 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 103 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 104 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 105 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 106 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 111 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 112 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 117 5-00040-509 1.0U Capacitor, Electrolytic, 50V, 20%, Rad

C 201 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad

C 202 5-00098-517 10U Capacitor, Tantalum, 35V, 20%, Rad

C 203 5-00327-517 22U Capacitor, Tantalum, 35V, 20%, Rad

C 204 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad

C 205 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad

C 206 5-00098-517 10U Capacitor, Tantalum, 35V, 20%, Rad

C 207 5-00250-532 82P Capacitor, Ceramic Disc, 50V, 10% NPO

C 208 5-00148-545 1000P - 50V Capacitor, Monolythic Ceramic, COG, 1%

C 209 5-00326-525 .001U Capacitor, Polystyrene, 50V, 5%, Ax

C 210 5-00326-525 .001U Capacitor, Polystyrene, 50V, 5%, Ax

C 211 5-00326-525 .001U Capacitor, Polystyrene, 50V, 5%, Ax

C 212 5-00326-525 .001U Capacitor, Polystyrene, 50V, 5%, Ax

C 213 5-00326-525 .001U Capacitor, Polystyrene, 50V, 5%, Ax

C 214 5-00326-525 .001U Capacitor, Polystyrene, 50V, 5%, Ax

C 215 5-00326-525 .001U Capacitor, Polystyrene, 50V, 5%, Ax

C 216 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U

C 217 5-00053-512 .033U Cap, Stacked Metal Film 50V 5% -40/+85c

C 218 5-00052-512 .01U Cap, Stacked Metal Film 50V 5% -40/+85c

C 219 5-00050-566 .0033U Cap, Polyester Film 50V 5% -40/+85c Rad

C 220 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U

C 221 5-00002-501 100P Capacitor, Ceramic Disc, 50V, 10%, SL

C 222 5-00002-501 100P Capacitor, Ceramic Disc, 50V, 10%, SL

C 223 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 224 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad

C 225 5-00106-530 9.0-50P Capacitor, Variable, Misc.

C 226 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad

C 227 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad

C 228 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U

C 229 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U

C 230 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad

C 231 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad

C 232 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 233 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 234 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 235 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 236 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

Parts List

DS360 Ultra Low Distortion Function Generator

6-16

C 237 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 238 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 239 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 240 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 241 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 242 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 243 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 244 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 245 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 246 5-00148-545 1000P - 50V Capacitor, Monolythic Ceramic, COG, 1%

C 247 5-00003-501 10P Capacitor, Ceramic Disc, 50V, 10%, SL

C 301 5-00537-554 2.2U Capacitor, Polypropylene, Radial

C 302 5-00323-554 .22U Capacitor, Polypropylene, Radial

C 303 5-00324-554 .022U Capacitor, Polypropylene, Radial

C 304 5-00325-525 .0022U Capacitor, Polystyrene, 50V, 5%, Ax

C 305 5-00537-554 2.2U Capacitor, Polypropylene, Radial

C 306 5-00323-554 .22U Capacitor, Polypropylene, Radial

C 307 5-00324-554 .022U Capacitor, Polypropylene, Radial

C 308 5-00325-525 .0022U Capacitor, Polystyrene, 50V, 5%, Ax

C 309 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U

C 310 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 311 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 312 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 313 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 314 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 315 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad

C 316 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad

C 317 5-00537-554 2.2U Capacitor, Polypropylene, Radial

C 318 5-00323-554 .22U Capacitor, Polypropylene, Radial

C 319 5-00324-554 .022U Capacitor, Polypropylene, Radial

C 320 5-00325-525 .0022U Capacitor, Polystyrene, 50V, 5%, Ax

C 321 5-00537-554 2.2U Capacitor, Polypropylene, Radial

C 322 5-00323-554 .22U Capacitor, Polypropylene, Radial

C 323 5-00324-554 .022U Capacitor, Polypropylene, Radial

C 324 5-00325-525 .0022U Capacitor, Polystyrene, 50V, 5%, Ax

C 325 5-00238-523 4P Capacitor, Silver Mica, Miniature

C 326 5-00337-532 10P Capacitor, Ceramic Disc, 50V, 10% NPO

C 327 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U

C 328 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 329 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 330 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 331 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 332 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 333 5-00337-532 10P Capacitor, Ceramic Disc, 50V, 10% NPO

C 334 5-00337-532 10P Capacitor, Ceramic Disc, 50V, 10% NPO

C 335 5-00337-532 10P Capacitor, Ceramic Disc, 50V, 10% NPO

C 336 5-00337-532 10P Capacitor, Ceramic Disc, 50V, 10% NPO

C 337 5-00337-532 10P Capacitor, Ceramic Disc, 50V, 10% NPO

C 338 5-00337-532 10P Capacitor, Ceramic Disc, 50V, 10% NPO

C 339 5-00238-523 4P Capacitor, Silver Mica, Miniature

C 401 5-00215-532 20P Capacitor, Ceramic Disc, 50V, 10% NPO

C 402 5-00215-532 20P Capacitor, Ceramic Disc, 50V, 10% NPO

Parts List

DS360 Ultra Low Distortion Function Generator

6-17

C 403 5-00012-501 330P Capacitor, Ceramic Disc, 50V, 10%, SL

C 404 5-00034-526 100U Capacitor, Electrolytic, 35V, 20%, Rad

C 405 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad

C 406 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad

C 407 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U

C 408 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U

C 409 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U

C 410 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U

C 411 5-00002-501 100P Capacitor, Ceramic Disc, 50V, 10%, SL

C 412 5-00002-501 100P Capacitor, Ceramic Disc, 50V, 10%, SL

C 413 5-00148-545 1000P - 50V Capacitor, Monolythic Ceramic, COG, 1%

C 414 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad

C 415 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad

C 416 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 417 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U

C 418 5-00337-532 10P Capacitor, Ceramic Disc, 50V, 10% NPO

C 501 5-00337-532 10P Capacitor, Ceramic Disc, 50V, 10% NPO

C 502 5-00053-512 .033U Cap, Stacked Metal Film 50V 5% -40/+85c

C 503 5-00536-516 30P Capacitor, Silver Mica, 500V, 5%,

C 504 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 505 5-00270-532 51P Capacitor, Ceramic Disc, 50V, 10% NPO

C 506 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 507 5-00028-507 100P Capacitor, Ceramic Disc,250V, 10%, Y5P

C 508 5-00028-507 100P Capacitor, Ceramic Disc,250V, 10%, Y5P

C 509 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 510 5-00041-509 220U Capacitor, Electrolytic, 50V, 20%, Rad

C 511 5-00041-509 220U Capacitor, Electrolytic, 50V, 20%, Rad

C 512 5-00337-532 10P Capacitor, Ceramic Disc, 50V, 10% NPO

C 513 5-00053-512 .033U Cap, Stacked Metal Film 50V 5% -40/+85c

C 514 5-00536-516 30P Capacitor, Silver Mica, 500V, 5%,

C 515 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 516 5-00270-532 51P Capacitor, Ceramic Disc, 50V, 10% NPO

C 517 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 520 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 521 5-00041-509 220U Capacitor, Electrolytic, 50V, 20%, Rad

C 522 5-00041-509 220U Capacitor, Electrolytic, 50V, 20%, Rad

C 523 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U

C 524 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U

C 525 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad

C 526 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad

C 527 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U

C 528 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U

C 529 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad

C 530 5-00100-517 2.2U Capacitor, Tantalum, 35V, 20%, Rad

C 531 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 532 5-00023-529 .1U Cap, Monolythic Ceramic, 50V, 20%, Z5U

C 533 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 534 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 535 5-00238-523 4P Capacitor, Silver Mica, Miniature

C 536 5-00238-523 4P Capacitor, Silver Mica, Miniature

C 701 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

C 702 5-00225-548 .1U AXIAL Capacitor, Ceramic, 50V,+80/-20% Z5U AX

Termékspecifikációk

Márka:	SRS
Kategória:	generátor
Modell:	DS360

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