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.
Scans by ArtekMedia O 2006

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.
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1.4.9 Waveform Characteristics
Horizontal Resolution
Up to 8192 points.
Vertical Resolution
4095 bits
( - 2047 to + 2047).
RiselFallTime
<350 ns.
1.4.10 Communication Ports (Optional)
IEEE-488Port (Option 001)
Type: IEEE-488-1978compatible, non-isolated,double
buffered.
Address: 0-30, internal DIP switch selectable or front
panel selectable.
Subsets: SHl,AHl,T6, TEO, L4, SRl,RLI, PPO, DCl,
CO. El.
RS-232-CSerial Port (Option002)
Communication is full duplex (bi-directional) with
CTSIDTR or XONIXOFF handshaking.
Connector: Rear panel mounted DB-25 (female) with
DCE or DTE configuration.
Data Format: 8 bits, no parity, one stop bit
Data Rate: 14 steps internal switch selectable (50,75,
1 10,134.5,150,200,300,600,1200,1800,2400,4800,
9600, 19,200).
1.4.11 General
Environmental
Temperature Range: + 23°C + 5°C for specifiedopera-
tion,operates0to
+ 50°C, - 20to + 75°C for storage.
WarmupTime:20minutesfor specified(guaranteed for
1year) operation.
Vibration: 5 to 55 Hz with maximum of 29 at 55 Hz.
Shock: 309, 11 ms half sine.
Altitude: Sea level to 10,000ft.for operation. Sea level
to 40,000 ft. for storage.
Relative Humidity: 95% at 25°C and at sea level
(non-condensing).
Dimensions:21 cm(8.27in.)wide, 10cm(3.94in.)high,
32.3 cm (12.72 in.) deep.
Weight: 3.55 kg (7.8 Ib) net, 4.68 kg (10.3 Ib) shipping.
Power:90to 128,180to 256 rms;48 to66 Hz; 1phase;
<25 VA.
1.4.1 2 Options
001: IEEE-488(GPIB) Port
For instrument control or entering waveform data.
002: RS-232-CSerial Port
For instrument control or entering waveform data.
NOTE
Options
001 and 002 are mutually exclusive.
Scans by ArtekMedia O 2006

INITIAL PREPARATION
2.1 UNPACKING INSPECTION
Aftercarefullyunpackingtheinstrument,visuallyinspect
allexternalpartsforpossibledamagetoconnectors,sur-
faceareas,etc. Ifdamageisdiscovered,fileaclaimwith
the carrier who transported theunit.The shippingcon-
tainer and packing material should be saved in case
reshipment is required.
2.2 ELECTRICAL INSTALLATION
2.2.1 Power Connection
WARNING
Toprecludeinjuryordeathduetoshock,the
third wire earth ground must becontinuous
tothe facility power outlet. Beforeconnect-
ing to the facility power outlet, examine
extension cords, autotransformers, etc.,
betweentheinstrumentandthefacilitypower
outletforacontinuousearthgroundpath.The
earthgroundpathcanbeidentifiedattheplug
on the instrument power cord; of three ter-
minals,theearthgroundterminal isthe non-
matching shape, usually cylindrical.
CAUTION
Topreventdamagetothe instrument, check
for proper match of line and instrument
voltage and proper fuse type and rating.
Line Voltage
Referto table 2-1 to determine the proper selection of
the linevoltage connector. Unlessotherwise specified
atthetimeof purchase,thisinstrumentwas shippedfrom
the factory with the power transformer connected for
operation on a
11 5 Vac line supply and with a 318 amp
fuse. If the unit is shippedfor
11 5 Vac operation, there
will be no markings or tags on the unit. If the unit is
shipped for 220Vac operation, there will bea 220 Vac
tag on the rear panel of the unit and a 3/16 amp fuse
installed.
2.2.2 Verifying the Line Voltage
To verify the line voltage (or change the fuse), the
operator must first removethetop and bottomcovers.
Removethetopandbottomusingthefollowingstepsand
figure 2-1.
1. Remove two (2) screws holding top and bottom
covers to rear panel.
2. Slidebothcovers(togetherasaunit)totherearand
remove fromthe chassis assembly.
Figure2-1. Top and Bottom Cover Removal
After thecovershavebeenremoved,the linevoltagecan
be checked by viewing the voltage label through the
inspection hole as shown in figure 2-2.
INSPECTION SLOT
GUARD PLATE
' REAR PANEL
Figure 2-2. Line Voltage InspectionHole
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2.2.3 Fuse and Voltage Selection
If the line voltage isnot correct according to table 2-1,
perform the following steps and refer to figure 2-3 for
steps1and2,andfigure 2-4for steps3thru6tochange
the line voltage and fuse.
1. Removethetwo screws holdingguardplatetothe
rear panel.
2. Remove the guard plate from the rear panel.
GUARD PLATE
SCREWS /
VOLTAGE SELECTOR
CONNECTOR
F U
AC PRIMARY
-
VOLTAGE
SELECTOR
Figure 2-3. Guard Plate Removal Figure 2-4. Fuse and Voltage Selection
3. Removethevoltageselector connector fromtheac
primaryboard. Rotatethe connector until the cor-
rect voltage selector indicator is on top.
4. Reinstall the voltage selector connector.
5. Removethe fuse and install new fuse as calledout
in table 2-1.
Connector Voltage
Position Range
90 to 128Vac 318 amp
Table 2-1. VoltagelFuse Selection
220V
WARNING
Because lethalvoltages are exposed, do
not apply ac power to the unit until the
guard plate isattached tothe unit.
Reassembly
Refer to figure 2-5 for step 1and figure 2-6for steps 2
thru 5.
1. Inserttheguardplateovertheac primaryboardand
voltage selector connector and align with screw
holes inthe rear panel. Secure with two screws.
180
to 256 Vac
BOARD
3116 amp
Figure 2-5. Rear Chassis Assembly
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Figure 2-6. Top and Bottom Cover Installation
2. Turn the instrument upside down, position the
bottomcover over the guardshieldand rear panel.
Slide the bottom cover forwardapproximately two
(2)incheswhile engagingthetopcover shieldslides
(seefigure 2-6,detail A) and the outside slide rails
(see figure 2-6,detail B).
3. Turntheinstrumentrightsideup.Installthetopcover
using the same procedure as in step 2.
4. Alignthe rearof boththetopandbottomcover with
each each other so that the cover interlocks are
properlymated.Oncemated,holdthecoversfirmly
together andslidethechassisassemblyintotopand
bottom covers.
CAUTION
When slidingonthe bottomcover, avoid
movingtheribboncables locatednearthe
power transformer.
5. Secure covers to unit using two screws as shown
in figure 2-1
.
2.2.4 Signal Connections
UseRG58U509coaxialcablesequippedwith BNCcon-
nectorstodistributesignalswhenconnectingthis instru-
ment to associated equipment.
NOTE
Signal ground may be floated up to
_t 42V
withrespecttochassisground.Beawarethat
all signal grounds arecommonandmust all
be floated together.
2.2.5 Interface Connections
The GPlB (Option 001) 110 rear panel connector is an
Amphenol 57-10240 or equivalent and connects to a
GPlB bus cable connector (available from Wavetek in
1 and 2 meter lengths).
NOTE
Theterms "GP1B"and "IEEE-488"are used
synonymously in this manual.
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2.2.6 GPlB Address
For Option 001 instruments on the General Purpose
Interface Bus(GPIB), ensure that the instrument GPlB
address is correct. The GPlB default address can be
changedbyresettingtheinternalDIPswitch(foraccess,
removethe top cover,see paragraphs 2.2.2 and 2.2.3)
orchangedtemporarilybypressingthefrontpanelADRS
soft key and rotatingthe Control knob when the GPlB
address is displayed.
The switchsections are labeledfrom 1thru 5andtheir
OPENpositionnoted(OPEN
= Binary "0" intable 2-2).
To verify the address, pressADRS soft keyonthe front
panel.
Table 2-2. GPlB Address Code
Device / Listen I Talk 1 1 2 3 4 5 Listen 1 Talk
2.2.7 The RS-2324 Connectors
The RS-232C110 rear panelpinconnections andsignal
names aregiven intable 2-3.The panel connector is a
DB-25 female connector (see figure 2-7) and will con-
nect to a standard RS-232C cable (interface type
E).
The data format is an 8-bit, no parity,one stop bit.The
baudrate isselectablefrom those listedintable2-5using
dip switch S1 (figure 2-8).
Table 2-3. RS-232-C Data InlOut
40
4 1
42 (Remaining Pins Not Connected)
43 'Transmit Data
'Receive Data
3~equestto Send
4~learto Send
'Data Set Ready
'Receive Line Signal Detect
7~ataTerminal Ready
Pin
2
3
4
5
6
7
8
20
-
/
RS-232-CConnector
Name
TXD'
RXD~
RTS3
CTS~
DSR5
SIG GRD
RLSD'
DTR~
Direction(DCE
Configuration)
IN
OUT
NIC
OUT
OUT
-
OUT
IN
Z-AXIS
out
I60011 1
Ref Ref Hold
In Out In In
ITTLI ITTL) lTTLl ITTLI
Direction(DTE
Configuration)
OUT
IN
OUT
IN
IN
-
IN
OUT
nnnnnnnnn
Figure 2-7. RS-232-C Connector Pinouts
NOTE: Address 31 is not allowed
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The following is a description of pin functions. Actual
installation is covered in paragraph 2.2.8.
Inthe DCEconfiguration,pins2and3aredatainputand
output respectivelyandmustbeused.Pin5maybeused
to indicate that the Model 75 is ready to receive data.
Pin20 tells the Model 75 that the connecteddevice is
readyto receivedata, but maybeconnectedtopin6of
the Model 75 if the other device is always ready. Pin 7
is signalground and must be used. Pins 6and8 will be
positive (asserted)when the Model 75 is on.
Inthe DTE configuration, pins 2 and 3 are data output
and input respectively and must be used. Pin 4 will be
positive whenever the Model 75 is On. Pin 5 tells the
Model75 that the connecteddevice is readyto receive
data.
If the other device is always ready, pins 4 and 5
of theModel75 maybeconnectedtogether. Pins6and
8 are properly terminated inputs but have no function.
Pin
20 will be positive when the Model 75 is ready to
receive data. Pin7 is signal ground and must be used.
1. Determine if the other device isa DCE device or a
DTE device. If this is not explicitly spelled out you
will needto look at the pinout for its connector. If
pin 2 isthe data output, the device is a DTE (most
computers). If pin 3 is the data output, the device
is a DCE (most modems).Configure the Model 75
as the opposite type of device by connecting the
internaloptioncabletotheappropriate header(see
figure 2-8).
Inmostcasesastraight through cable canbeused
toconnect the Model75 with the other device. The
Model75 only requirestheconnectionof pins2, 3,
5,7,and20butthe other devicemay require more.
Examplesof typicalcableassembliesareshownin
figure2-9.However,thereare manyinterpretations
of theRS-232Cstandardandeither of thefollowing
procedures (aor b)should be used to ensure that
the control and handshake signals are properly
connected.
The handshaking method is front panel selectable as a. If the Model 75 is configuredas a DCE then;
CTSIDTR (hardware)or XONIXOFF(seeparagraph3-32
for more information). (1) Pin 7 (signal ground) is always connected
straight through.
2.2.8 Connectingthe RS-232-C Interface
Before connecting the Model 75 using the RS-232C
interface,thecorrect configuration(DCEor DTE)must
beselected andthe internal ribboncable connectedto
either the DCE or DTE location (see figure 2-8)on the
RS-232-Coption board.To determine which configura-
tion iscorrect,you will needthe manualfor the device
towhich you are connecting the Model 75. The follow-
ing assumes that the other device has a DB-25,
RS-232-Cconnector.
DCE HEADER
Figure 2-8. Baud Rate Switch and DTElDCE
Connections
(2) Pins 2 and3areconnectedstraightthrough
if DCEIDTE configuration is correct.
(3) Pin 5 of the Model 75 will needto be con-
nectedto an input of the other device that
will enable and disable the character
transmission from that device. If the other
device does not support this, XONIXOFF
handshakingwill be requiredandpin5can
be left disconnected.
(4) Pin20of the Model75shouldbeconnected
to an output pin on the other device that
indicateswhen it is ready to accept data.
Iftheotherdevicedoesnothavesuchapin
but is not always ready,it cansendXOFFs
and XONs to indicate readiness. When
usingthis method, or if the other device is
alwaysreadytoacceptdata,thispincanbe
connectedtoanalwayspositive pinonthe
otherdeviceortopin60r8ontheModel75.
(5) Pins6 and 8 are always positive when the
power is on and can be connected to any
pinsonthe other devicethat requirebeing
held positive.
b. If the Model 75 is configured as a DTE then;
(1) Pin 7 (signal ground) is always connected
straight through.
(2) Pins2and3areconnectedstraightthrough
if DCEIDTE configuration is correct.
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(3) Pin20 of the Model 75 will needto be con-
nectedto an input of the other device that
willenable(positive) anddisable(negative)
the character transmission from that
device. Iftheother devicedoes notsupport
this, XONIXOFF handshaking will be
required and pin 20 can be left dis-
connected.
(4) Pin5of the Model75shouldbe connected
to an output pin on the other device that
indicateswhetheror not itisreadytoaccept
data.Iftheotherdevicedoesnot havesuch
a pin but is not always ready, it can send
XOFFs and XONs to indicate readiness.
When using this method, or if the other
device isalways ready to accept data, this
IBM-PC
APPLE II WITH SUPER SERIAL CARD
IBM-PC INCOMMUNICATIONS MODE
MODEL 75 MODEL 75
(DCE) APPLE II
DB-25
FEMALE DB-25 DB-25
MALE MALE DB-25
MALE
WAVETEK MODEL 6000 APPLE MACINTOSH
6000
MODEL 75 MODEL 75
(DCE) MACINTOSH (DTE)
D6-25
MALE D6-25 DE-9
MALE MALE
Figure 2-9. Typical Examples of Serial Cables
DB-25
MALE
2-6
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pincanbeconnectedtoanalwayspositive
pin on the other device or to pin 4 on the
Model 75.
(5) Pin 4 is always positive when the power is
onand canbeconnectedtoany pinon the
other device that requires being held
positive.
(6) Pins6and8areproperlyterminatedinputs
but have no function.
NOTE
Anypins notmentionedinthepreviouslist are
not connectedin theModel 75andtherefore
canbe connectedtoanything if theconnec-
tions are already present in the cable.
3. The handshaking methodis front panel selectable
as CTSIDTR (hardware) or XONIXOFF (see para-
graph 3.31 for more information).
4. Setthebaudrateonthe Model75tothehighest rate
that isavailable onboththe Model75andtheother
device by setting the dip switches (figure 2-8)
according to table 2-4.
5. Configure the other device for the same baud rate
as in step 4, 1 stop bit, 8 data bits, and no parity.
Table 2-4. RS-232-C DIP Switch Settings
Baud Rate SW1-4 SW1-3 SW1-2 SW1-1
Closed
Open
Open
Closed
Open
Open
Closed
Open
Closed
Open
Open
Closed
Open
Closed
Open
Open
Closed
Closed
Open
Closed
Closed
Closed
Open
Open
Closed
Open
1 Open I Closed
Closed
1 (3;:; I Closed
Open Open
Closed
Closed
Closed
Open
Closed
Closed
Open
*This is the factory set position
NOTE 1. SW1-5 should always be OPEN
2. Factory connector configuration is DCE
Closed
Closed
Closed
Open
Open
Open
Open
Open
Open
Closed
Closed
2.3 INITIAL CHECKOUT PROCEDURE
The Model 75 ARB waveform generator will supply a
variety of waveforms at theARBOut connector that can
bemodifiedat will usingthefront panelcontrols.Inorder
toverifytheoperationof thecontrolsandthefunctions1
modeslvaluesthat they control,thegenerator must first
beset uptoproduceanoutputandthentheeffectof the
controlsontheoutput andthedisplay indicationsnoted.
While this procedureverifiesfunctionaloperationof this
instrument,itdoes notverify thecalibration.Thevalues
shown are typical values and should only be usedas a
guide. Requiredtools and test equipment areshown in
table 2-5.
Closed
Open
Open
Open
Table 2-5. Test Equipment and Tools
Instrument Comments
Oscilloscope *
50R Feedthrough
BNC Tee
BNC Coax Cable
Signal Source*
Frequency
Counter
Dualchannel. 20 MHz rninband-
width with external trigger andZ-
axis capability.
2% accuracy, 2W
1 male to 2 female
RG58U, Q 3 ft. length(4 each)
1 MHz capability with square
wave (10 Vp-p into 50R) and TTL
output.
Capable of both frequency and
period measurements.
*Check the oscilloscope manual to determine the
maximum allowable Z-axis input voltage. Do not
exceed that voltage.
*AsecondModel75canbeusedasthesignalsource.
For the TTL signal requirements, use the Ref Out
connector on the rear panel and use the SAMPL
soft key to set the frequency. For the 1 kHz, 10Vp-p
signal, usetheSTOPsoft keytoset thestop address
to 1999,usethe FREQsoft key toset the frequency,
and use the FUNC and EXEC soft keys to select a
square wave. See section 3 for more detail.
To verify the overall operation of the Model 75 ARB
waveform generator,follow the procedure intable 2-6.
Refertothe referencedfigures andtablesfor appropriate
test equipmentconnectionsandsettings. Refertofigure
3-1 and paragraph 3.2 for control and connector
locations.
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Table 2-6. Checkout Procedure
Step
1
ControllSwitch
Power
PositionlOperation
Press On
ObservationlComments
Display indicates "WAVETEK MODEL 75".
I I
Adjust the LCD viewing control for best contrast.
-- -
-
Thisstep verifies the "Reset" functions of the Model 75.
Pressthree times
Press once
Pressonce
2
Display indicates "RESET Ver x.xx".
Display indicates "RESET Ver x.xx X".
Setup
F2(Reset)
F3(Exec)
Thisstep verifies the "Z-Axis" functions of the Model 75.
Setup
F2(ZLOGIC)
Control knob
Control knob
F1 (ZLEVL)
Control knob
Control knob
Press once
Press once
Rotate until display
indicates "ZLOGIC
POS".
Rotate until display
indicates "ZLOGIC
NEG".
Press once
Rotate CW until
display indicates
"ZLEVEL 14V".
RotateCCW to step
display through the
selectable settings.
Connect the Model 75 as shown in figure 2-10. Set
equipment controls as indicated in table 2-7.
Displayindicates "ZLOGIC NEG" or "ZLOGIC POS".
Oscilloscope will indicate a dc level of
0 Vdc + 1V
with positive-going pulses.
Oscilloscope will indicate a dc level of
2, 4, 6, 8, 10,
12, or 14 Vdc with negative-going pulses.
Oscilloscope will indicate a dc level of
+ 14V +_ 1V
with negative-going pulses.
Oscilloscope will indicate the selected voltage
+_ 1V
with negative-goingpulses.LeaveSettingat "ZLEVEL
2V".
Thisstep sets the "Z-Axis Out" voltage level and polarity.
Control knob RotateCW or CCW
to set acceptable
contrast between
trace and thumb-
tacks. Adjust oscillo-
scope intensity if
required.
Connect the Model 75 as shown in figure 2-11. Set
equipment controls as indicated in table 2-8.
If thumbtack intensity is too bright at + 2V, terminate
theZ-axiscablewitha 50Qload.Ifthethumbtacks are
dimmed instead of intensified, set ZLOGIC to POS.
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Table 2-6. Checkout Procedure (Continued)
Thisstep verifies the "Waveform Memory'' functions of the Model 75.
Store
F2 (CHAIN)
Control knob
ObservationlComments
F3 (EXEC)
Edit
F1 (FUNC)
Control knob
PositionlOperationStep
F3 (EXEC)
ControllSwitch
Edit
F1 (START)
Control knob
Control knob
F2(STOP)
Control knob
Control knob
Store
F2 (CHAIN)
Control knob
F3 (EXEC)
Edit
F1 (FUNC)
F3 (EXEC)
Presstwo times
Press once
Rotate until display
indicates "CHAIN
8K".
Press once
Press two times
Press once
Rotate until display
indicates "FUNC
SINE"
Press once
Press two times
Press once
RotateCW
RotateCCW
Press once
RotateCCW
RotateCW
Press two times
Press once
Rotate until display
indicates "CHAIN
2K".
Press once
Presstwo times
Press once
Press once
Resetthe oscilloscope horizontal sweepto 1msIDIV.
Oscilloscopewill indicateslightly morethanonecycle
of the sine wave at approximately 10 Vp-p.
Displaywill indicate ">ST
= 0000 SP = 8191 ".
Oscilloscope waveform start pointwill movefrom left
to right until waveform disappears. Display will now
indicate ">ST
= 8191 SP = 8191 ".
Oscilloscopewaveform start pointwill movefromright
to left until waveform is complete. Display will now
indicate ">ST
= 0000 SP = 8191 ".
Display will indicate "ST = 0000 >SP = 8191.
Oscilloscopewaveform stoppointwill movefrom right
to left untilthe waveform disappears.The displaywill
now indicate "ST
= 0000 >SP = 0000".
Oscilloscopewaveform stop pointwill movefrom left
to rightuntilthewaveform iscomplete.Thedisplaywill
now indicate "ST = 0000 >SP = 8191 ".
Display indicates "CHAIN 8K"
Display indicates "FUNC SINE".
Set the oscilloscope sweep to
.5 mslDIV.
Display will indicate "FUNC SINE X". Oscilloscope
willdisplaylessthan3cyclesof asinewaveof approx-
imately 10Vp-p.
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