Wavetek 75 User manual

INSTRUCTION MANUAL
Model 75
Arbitrary
Waveform Generator
0 1986 Wavetek
This document contains information proprietary to
Wavetek and is provided solely for instrument
operation and maintenance.The informationin this
documentmay not beduplicatedinany mannerwith-
out the prior approval in writing from Wavetek.
WAVETEIQ
WAVETEK SAN DIEGO, INC.
9045 Balboa Ave.. San Diego, CA 92123
P. 0. Box 85265. San Diego. CA 92138
Tel [phone] TWX 91013352007
Manual Revision 2/89
Manual Part Number: 1300-00-0366
Scans by ArtekMedia O 2006

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CONTENTS
SECTION 1 GENERAL DESCRIPTION
1.1 MODEL 75 ................................................. 1-1
........................................
1.2 WAVEFORM EDITING 1-1
.......................................
1.2.1 Standard Waveforms 1-1
......................................
1.2.2 Rubber Band Editing 1-1
............................
1.2.3 Digital Amplitude and Digital Offset 1-1
1.2.4 Point Edit
................................................ 1-1
......................................
1.3 STANDARD FEATURES 1-1
........................
1.3.1 8192 x 4095 Point Waveform Resolution 1-1
................................
1.3.2 Crystal Controlled Frequency 1-1
..........................................
1.3.3 Operating Modes 1-1
..................................
1.3.4 Internal Waveform Counter 1-1
1.3.5 Hold Function
............................................. 1-1
...........................................
1.3.6 Return Function 1-2
.........................................
1.3.7 Stored Waveforms 1-2
...............................
1.3.8 Non-Volatile Instrument Set-Up 1-2
...........................................
1.3.9 Series Operation 1-2
.........................................
1.3.10 Parallel Operation 1-2
...................................
1.3.11 Communications Options 1-2
...........................................
1.4 SPECIFICATIONS 1-2
.......................................
1.4.1 Standard Waveforms 1-2
..........................................
1.4.2 Operational Mode 1-2
.......................................
1.4.3 Waveform Resolution 1-2
..............................................
1.4.4 Sample Rate 1-2
............................................
1.4.5 Output Signals 1-3
......................................
1.4.6 Output Characteristics 1-3
...................................................
1.4.7 Inputs 1-3
1.4.8 Trigger Sources
........................................... 1-3
..............................
1.4.9 Communication Ports (Optional) 1-4
................................................
1.4.10 General 1-4
1.4.11 Options
................................................. 1-4
SECTION 2 INITIAL PREPARATION
....................................
2.1 UNPACKING INSPECTION 2-1
..................................
2.2 ELECTRICAL INSTALLATION 2-1
.........................................
2.2.1 Power Connection 2-1
...................................
2.2.2 Verifying the Line Voltage 2-1
..................................
2.2.3 Fuse and Voltage Selection 2-2
.......................................
2.2.4 Signal Connections 2-3
......................................
2.2.5 Interface Connections 2-3
.............................................
2.2.6 GPlB Address 2-4
......................
2.2.7 RS-232 Baud Rateand DTElDCESelection 2-4
..............................
2.2.8 Connecting the RS-232 Interface 2-5
..............................
2.3 INITIAL CHECKOUT PROCEDURE 2-7
Scans by Artekhledia O 2006

CONTENTS (Continued)
SECTION 3 OPERATION
... ......
3.1 INTRODUCTION ......... ........... 3-1
....
3.2 CONTROLS,CONNECTORS. AND INDICATORS .......... 3-1
.................................
3.3 OPERATION ...... 3-7
.......
3.4 INITIAL SETUP ...... ................... 3-7
................................
3.5 EDITING WAVEFORMS 3-7
...........................
3.6 THUMBTACKS AND CURSOR 3-8
...........................
3.7 RUBBER BAND EDITING 3-8
3.8 INSERTING STANDARD WAVEFORMS................ 3-8
3.9 DIGITAL AMPLITUDE
............................... . . 3-8
...... ......... 3.10 NORMALIZING ...... . 3-8
.....
3.11 DIGITAL OFFSET ............................. 3-8
........................................
3.12 POINT EDITING 3-8
.............................
3.13 START AND STOP ADDRESSES 3-11
............................
3.14 WAVEFORM PARAMETERS 3-11
............
3.14.1 Waveform Frequency, Period, and Sample Freq 3-11
3.14.2 External Reference
................................ 3-12
3.14.3 Waveform Amplitude
.......................... ... 3-12
............................
3.14.4 Waveform Offset ... 3-12
................................
3.15 OPERATIONAL MODES 3-12
3.15.1 Continuous Mode
............................... . . 3-12
......................................
3.15.2 Triggered Mode 3-12
3.15.3 Gated Mode
............................. ........ 3-12
.........................................
3.15.4 Toggled Mode 3-12
..... 3.15.5 Burst Mode ....................... . . 3-13
....
3.16 SETTING AND CLEARING BREAK POINTS ........... 3-13
.............................
3.17 SYNC ADDRESS AND PHASE 3-13
......
3.18 STORllVG AND RECALLING WAVEFORMS ....... 3-13
3.19 CHAINED OPERATION
............................... 3-13
................................
3.20 WAVEFORM COUNTER 3-13
..................................
3.21 WAVEFORM HOLD 3-13
....................................
3.22 RETURN TO START 3-13
................................
3.23 LOW BATTERY INDICATOR 3-14
3.24 SERIES OPERATION
...............................
. 3-14
3.25 PARALLEL OPERATION
.................... ... 3-14
.....................
3.26 GPlB CONTROLS (Option 001 Only) 3-15
...........................
3.26.1 GPlB Address DIP Switches 3-15
.........................................
3.26.2 Setup Menu Key 3-15
.........................................
3.26.3 BLIFFR Soft Key 3-15
........................................
3.26.4 ADRS Soft Key 3-15
.....................................
3.26.5 LOCAL Soft Key 3-15
.........................................
3.26.6 Control Knob 3-15
.................
3.27 GENERAL PLIRPOSE INTERFACE BUS (GPIB) 3-16
.................................
3.27.1 Bus Line Definitions 3-17
...................................
3.27.2 Handshake Sequence 3-18
..........................................
3.27.3 Commands 3-18
........................................
3.27.4 Listen Address 3-18
............................................
3.27.5 Talk Address 3-18
.................... ..... ...
3.27.6 Secondary Address .. .. 3-18
....................................
3.27.7 Universal Commands 3-18
Scans by ArtekMedia O 2006

CONTENTS (Continued)
3.27.8 Addressed Commands .................................. 3-19
3.27.9 Data Transfer
....................................... 3-19
3.28 MODEL 75 GPlB PROGRAMMIIVG
....................... 3-19
3.28.1 General Programming Information
.................. 3-19
3.28.2 Characters
..................................... . . 3-19
3.28.3 Action and Parameter Commands
............... ... 3-20
3.28.4 Action Commands
..................... ....... 3-20
..... 3.28.5 Programming Parameters ...................... 3-20
3.28.6 Sending Waveforms to the Model 75
....... ........... 3-20
3.28.7 High Speed Binary Waveform Transfer
......... 3-21
...
3.28.8 Reading Waveforms From the Model 75 ... 3-21
..............................
3.28.9 Programming Reference Guide 3-21
...........
3.29 ERRORS - GPlB REPORTING ........... 3-26
............................................
3.29.1 Class 1 Errors 3-26
.........................................
3.29.2 Class 2 Errors 3-27
......................................
3.29.3 Class 3 Errors 3-27
3.30 RS-2326 CONTROLS
..... . . . . 3-27
....
3.30.1 Setup Menu Key 3-27
3.30.2 BUFFR Soft Key
. . . . 3-28
....................................
3.30.3 LOCAL Soft Key 3-28
... 3.30.4 HAND Soft Key . . . . 3-28
..................................
3.30.5 Control Knob 3-28
.........................................
3.30.6 Baud Rate Switch 3-28
... ......
3.31 GENERAL RS-2326 INFORMATION ..... 3-28
......
3.31.1 Characters ...... ... . . 3-29
......... 3.31.2 RS-2326 Terminators ..... 3-29
............................
3.31.3 Action and Parameter Commands 3-30
..... 3.31.4 Action Commands . . ....... . . 3-30
... ....
3.31.5 Programming Parameters ........... 3-30
.........................
3.31.6 Sending Waveforms to the Model 75 3-31
3.31.7 Reading Waveforms from the Model 75
..................... 3-31
3.31.8 Programming Reference Guide
........................... 3-31
...
3.32 ERRORS - RS-232-C REPORTING .................... 3-31
3.32.1 Class 1 Errors
........................................ 3-31
....
3.32.2 Class 2 Errors .... 3-32
3.32.3 Class 3 Errors
. ..... ..................... 3-32
SECTION 4 CIRCUIT DESCRIPTION
4 1 INTRODUCTION 4-1
4 2 DETAILED CIRCUIT DESCRIPTION 4-1
4 2 1 S~gnalPath 4-1
4 2 2 T~m~ngAnd Tr~gger~ng 4-9
4 2 3 Instrument Control 4-12
4 2 4 Commun~cat~onOptlons 4-18
4 2 5 Power Supply 4-19
Scans by ArtekMedia O 2006

CONTENTS (Continued)
SECTION 5 CALIBRATION
SCOPE
................................ 5-1 ...........
..........................
FACTORY REPAIR .... ..... 5-1
REQUIRED TEST EQUIPMENT... .................. 5-1
CALIBRATION
. . ...... ........ .............. 5-1
AMPLITUDE
..................... ........... 5-3
OFFSET
.................................... ...... 5-4
FREQUENCY
.................................. .... 5-5
OUTPUT WAVEFORM RISE AND FALLTIME
................. 5-6
................ SUM IN ........................ 5-7
SECTION
6 TROUBLESHOOTING
6.1 FACTORY REPAIR ................................... 6-1
6.2 BEFORE YOU START
.................................. 6-1
6.2.1 Isolating a Problem
...................................... 6-1
6.2.2 Troubleshooting Dynamic Digital Circuits
.................... 6-3
6.3 TROUBLESHOOTING GUIDES............................... 6-3
6.3.1 Power Supply ........................................... 6-3
6.3.2 Microprocessor and Main Memory
......................... 6-16
6.4 TROUBLESHOOTING lNDlVlDUAL COMPONENTS
................. 6-20
6.4.1 Transistor
.......................................... 3-20
6.4.2 Diode
............................................ 6-20
6.4.3 Operational Amplifier
............................... 6-23
6.4.4 Field Effect Transistor (FET)
.............................. 6-20
................................
6.4.5 Capacitor .... 6-20
6.4.6 Logic Levels
........................................ 6-20
SECTION
7 PARTS LIST AND SCHEMATICS
7.1 DRAWINGS
....................................... 7-1
............................................. 7.2 ERRATA 7-1
7.3 ORDERING PARTS
................................. 7-1
APPENDIX
APPENDIX A AMERICAN STANDARD CODE FOR INFORMATION INTERCHANGE
(ASCII).................................................. A-1
APPENDIX B MODEL 75 QUICK REFERENCE GUIDE ............................. B-1
Scans by ArtekMedia O 2006

viii
Model 75 Arbitrary Waveform Generator
Scans by ArtekMedia O 2006

GENERAL DESCRIPTION
1.1 MODEL 75
The Model 75 is a versatile, yet easy to use arbitrary
waveform generator. It contains advanced waveform
editingfeatures that allowthe user toeasilycreateand
edit complex waveforms.
1.2 WAVEFORM EDITING
Theeditingfeaturesare basedonapairof pointscalled
"thumbtacks". These thumbtacks are placed at each
endof theportionof thewaveformtobeedited,thenthe
appropriateeditingfeature is invoked.Thethumbtacks
willappear as brightdotsonanoscilloscopeusingZ-axis
modulation.
1.2.1 Standard Waveforms
Standardwaveforms are inserted betweenthe thumb-
tacks.Astandardwaveformcanbetheentirewaveform
or only part of it. The standard waveforms are sine,
cosine,inversesine,haversine(inversecosine),triangle,
square, ramp up, ramp down, and dc. These standard
waveforms can then be edited using the other editing
features if desired.
1.2.2 Rubber Band Editing
Rubberbandeditingisanalogoustostretchingarubber
band between two thumbtacks. A cursor is placed
betweenthe thumbtackswhich canbemovedineither
theXor theydirection.Thewaveform isthenstretched
from each thumbtack to the cursor in real time.
1.2.3 Digital Amplitude and Digital Offset
Thesectionof thewaveformthat isbetweenthethumb-
tackscanbeadjustedinamplitudeandoffset inrealtime
without affecting the rest of the waveform.
1.2.4 Point Edit
Individualpointsof the waveform can alsobeadjusted
in real time.
1.3 STANDARD FEATURES
1.3.1 8192 x 4095 Point Waveform Resolution
Thewaveformshaveavertical resolutionof 4095points
and a horizontal resolution adjustable from 2 to 8192
points. The waveform memory is broken up into four
blocksof 2048horizontalpoints.Thiscanbeusedasone
waveform of up to 8192 points or as four different
waveforms(oneactiveandthree stored)of upto 2048
points each.
1.3.2 Crystal ControlledFrequency
Thewaveform clock(samplefrequency) is crystalcon-
trolled andadjustablefrom 20 mHzto2 MHz(500nsto
50s),allowingawaveformperiodof 1psto 113.8hours.
The frequency is adjustable as either waveform fre-
quency, waveform period, or sample frequency. An
external
TTL levelclockof upto2MHzcanalsobeused
as the waveform clock (samplefreq).
1.3.3 Operating Modes
The Model 75 can operate in continuous, triggered,
gated, toggled,or burst modes.All modesexcept con-
tinuous are initiated(triggered) by either a front panel
pushbutton or an external signal. In these modes the
waveform stops at break pointswhich canbe inserted
anywhereinthewaveform(bydefaultonebreakpointwill
beat the start address),then waits for another trigger.
Inburst mode, apredetermined number of waveforms
(from
1 to 1,048,575)is generated before stopping.
1.3.4 Internal Waveform Counter
Ingated, toggled, and burst modesan internal counter
can be used to display the number of complete
waveforms since the last trigger. This is particularly
usefulfor monitoringa burst of waveforms or counting
the number of waveforms for fatigue testing.
1.3.5 Hold Function
A front panel pushbutton or external signal will cause
the waveform to stop at the current output level and
remain there until the hold is released.
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1.3.6 Return Function
A front panel pushbutton or external signal will cause
the output to ramp back to the start value. The rate of
this rampisadjustablefrom0(instant returntostart)to
100 ms per vertical point.
1.3.7 Stored Waveforms
Three additional waveforms may be stored (with their
parameter settings) inwaveform memory.These may
later be recalled into, or exchanged with the active
waveform.Thisfeature isonlyavailablewith horizontal
resolutions of 2048 points or less.
1.3.8 Nonvolatile InstrumentSetup
The complete instrument setup is stored in battery
backed up memory so that it will not have to be reset
after the power has been turned off.
1.3.9 Series Operation
SeveralModel75'scanbeconnectedinseries,eachone
producing a burst of waveforms, with their outputs
summedtogether (usingthe "sum in" connector).This
can be used to produce long waveforms or unusual
sequences such as 50 "normal" waveforms and then
1 "abnormal" waveform.
1.3.1 0 Parallel Operation
SeveralModel75'scanbeconnectedinparalleltocreate
phasecoherentarbitrarywaveforms.Thephaserelation-
shipiscompletely adjustablewith a resolutionequalto
the horizontal resolution of thewaveform. This feature
isusefulinthreeaxismechanicaltestingandmulti-phase
power applications.
1.3.1 1 CommunicationsOptions
EitheranIEEE-488orRS232Ccommunicationinterface
is available totransfer waveform data and control the
Model 75 from a computer.
1.4 SPECIFICATIONS
1.4.1 Standard Waveforms
DC,square,triangle, up-ramp,down-ramp,sine,cosine,
inverse sine, and haversine waveforms are provided.
Each of these waveforms can be stored into the
waveform memorybetweenthumbtacksautomatically,
and then editedwith the waveform editing functions if
desired.
1.4.2 OperationalModes
Continuous
Output runs repetitively from the programmed start
address to the programmed stop address.
Triggered
Output quiescent until triggered by external signal or
front panel pushbutton, then runs until another break
point is encountered. Break points can be inserted
anywhere inthewaveform with thedefault break point
at the beginning of the waveform.
Gated
Sameastriggeredmodeexcept that the output iscon-
tinuous for the duration of the gate signal and untilthe
firstbreakpointencountered afterthegatesignalends.
Burst
Sameas inthe triggered modeexcept that a program-
mable number of waveforms is counted before the
waveforms stop. The maximum burst is 1,048,575
waveforms.
Toggled
Theoutput isquiescent untiltriggered.Itthenrunscon-
tinuouslyuntilanothertrigger stopsthewaveformatthe
next break point.
1.4.3 Waveform Resolution
NormalWaveform
2048 points horizontal
x 4095 points vertical.
Chained Waveform
8192 points horizontal
x 4095 points vertical. Stored
waveforms are not available with chained operation.
1.4.4 Sample Rate
Range
0.02 Hz to 2.0 MHz (50 s to 500 ns)
Waveform Periodand Frequency
Theactualwaveform periodisthe numberof horizontal
points(fromstarttostopaddress)timesthesampletime.
This can rangefrom 1microsecondfor a squarewave
to 113.8 hours for a waveform using all 8192 points.
Frequency Resolution
4 digits
Frequency Accuracy
+ 0.015 '10
Repeatability (24 Hr)
+ 25 ppm
Temperature Coefficient
<5 ppml°C
Scans by Artekhledia O 2006

1.4.5 Output Signals Z-Axis Out
Amplitude This signal is apulse,adjustable inamplitude from 2to
14 volts, that is used to modulate the Z-axis of an
Range:
+ 0.005 to 5 Vp into 509(0.01 to 10VP-Pinto oscilloscopewhen usingthewaveformeditingfeatures.
509). + 0.01to 1OVp intoanopencircuit(0.02to20Vp-p The logic polarity is also selectable.
into an open circuit).
Resolution: 3 digits.
Accuracy:
+ 1.8%of settingand + 2.5mVforamplitude
1.4.7 Inputs
+ offset 20.5V.
k 1.8%of setting and ? 0.25 mV for 0.5V > amplitude
sum In(509)
+ offset 250 mV. Thesignalat thisinputisaddedtothearbitrarywaveform
+ 1.8%ofsetting and + 25 pV for 50 mV > amplitude toproduceanoutput(atwaveform out)ofthesumofthe
+ offset. two.A peak input of
+ 5V w~llproducean output equal
Repeatability (24 Hr):
k 0.1 O/O of setting. to the amplitude setting. Input is fuse protected.
Tem~eratureCoefficient: 6150 ppml°C of setting. Accuracy is 4% (2% if internal fuse is shorted).
Offset Trig In(TTL)
lm~edanceis 100 KR. Sianal is used to control the
Range:
+ 5~to - 5V into 50R (- 10Vto + 1OV intoan ge"erator inthe trigger, gaie,toggle, andburst modes.
open circuit). Absolute amplitude
PIUS offset may not Slope polarity is selectable,
exceed + 5V into 50R (+ 10V into an open circuit). Svnc In(TTL)
Resolution: 3 digits. lkpedanbeis100KR.Ahighinputcausesthewaveform
Accuracy: 2%of settingand
+ 15mV for amplitude +
to restart at the start address. Primarily used for syn-
offset 20.5V. chronizing several arbitrary waveform generators in
2%of setting and k 1.5mVfor 0.5V>amplitude + off- parallel operation.
set 250 mV. Ref In (TTL)
2% ofsetting and + 0.15mV for 50 mV > amplitude +
Impedance is 100 KR.This signal input is used for the
offset. sample clock when the external ref is selected.
Repeatability (24 Hr):
+ 5 mV and + 0.1 O/O of setting.
Temperature Coefficient:
6(+ 1 mV + 150 ppm)l°C of
setting.
1.4.6 Outputs
ARB Out (50R)
Source of primary waveform output. Maximum
amplitude is
+ 5Vp into 50R.Output is fuse protected.
Sync Out (TTL)
Will drive upto 10LSTTLloads.Thisisapulse 1sample
time wide that is usually used to sync an oscilloscope
or another ARB generator. Pulsepositionis adjustable
to any point in the waveform.
Burst Done Out (TTL)
Willdriveupto 10LSTrLloads.ATTL low indicatesthat
the waveform is running. TTL high indicates that the
instrument is waiting for a trigger in triggered, gated,
toggle, or burst modes.Usedprimarily to start another
ARB generator in series operation.
Ref Out (TTL)
Will drive up to 10 LSTTL loads.This pulse train at the
sample frequency is used primarily as a reference
source for other ARB generators inseries operation or
in parallel operation.
Hold In
Impedanceis 100KR.ATTLlowor switchclosureat this
inputcausesthe generator tostopat the current output
level and remain there until released by a TTL high or
switch opening.
Return In
Impedanceis 100KR.
ATTLlowor switchclosureat this
input causes the output level to ramp back to the start
value.'The ramp rate is front panel selectable from 0 to
100ms per point.
1.4.8 Trigger Sources
Manual
Use the Trigger pushbutton switch on front panel to
operate internaltriggercircuitry.The slopepolaritycan
be set via the display menus.
External
Usethe communicationports(GPIBor RS-232C)orthe
Trig Inconnector on front panel. Trig Inconnector fre-
quency inputcanbeupto 1MHz.Theslopepolaritycan
be set via the display menus.
Scans by ArtekMedia O 2006