Wavetek 75 Instruction 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 information in this
document may not be duplicated in any manner with­out 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

921 38

Tel

61 912792200

TWX

91 013352007

Manual Revision

2/89

Manual Part Number:

1300-00-0366

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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 81 92 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

.........................................

1.3.1 0 Parallel Operation 1-2

...................................

1.3.1 1 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 Rate and DTElDCE Selection 2-4

..............................

2.2.8 Connecting the RS-232 Interface 2-5

..............................

2.3 INITIAL CHECKOUT PROCEDURE 2-7

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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

......

.........

3.1 0 NORMALIZING

......

. 3-8

.....

3.11 DIGITAL OFFSET

.............................

3-8

........................................

3.1 2 POINT EDITING 3-8

.............................

3.1 3 START AND STOP ADDRESSES 3-11

............................

3.1 4 WAVEFORM PARAMETERS 3-11

............

3.1 4.1 Waveform Frequency, Period, and Sample Freq 3-11

3.1 4.2 External Reference

................................

3-12

3.1 4.3 Waveform Amplitude

..........................

...

3-12

............................

3.1 4.4 Waveform Offset

...

3-12

................................

3.1 5 OPERATIONAL MODES 3-12

3.1 5.1 Continuous Mode

...............................

. .

3-12

......................................

3.1 5.2 Triggered Mode 3-12

3.15.3 Gated Mode

.............................

........ 3-12

.........................................

3.1 5.4 Toggled Mode 3-12

.....

3.15.5 Burst Mode

.......................

. .

3-1 3

....

3.16 SETTING AND CLEARING BREAK POINTS

...........

3-13

.............................

3.1 7 SYNC ADDRESS AND PHASE 3-13

......

3.1 8 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

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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~gnal Path 4-1

4 2 2

T~m~ng And Tr~gger~ng 4-9
4 2 3 Instrument Control 4-1 2
4 2 4

Commun~cat~on Optlons 4-1 8
4 2 5 Power Supply 4-1 9

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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 FALL TIME

.................

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

l NDlVlDUAL 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

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viii

Model

75

Arbitrary Waveform Generator

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GENERAL DESCRIPTION

1.1 MODEL 75

The Model 75 is a versatile, yet easy to use arbitrary
waveform generator. It contains advanced waveform
editing features that allow the user to easily create and
edit complex waveforms.

1.2 WAVEFORM EDITING

The editing featuresare based on a pair of points called
"thumbtacks". These thumbtacks are placed at each
end of the portion of the waveform to be edited, then the

appropriate editing feature is invoked. The thumbtacks
will appear as bright dots on an oscilloscope using Z-axis
modulation.

1.2.1 Standard Waveforms

Standard waveforms are inserted between the thumb­tacks. Astandard waveform can be the entire waveform

or only part of it. The standard waveforms are sine,
cosine, inverse sine, haversine (inverse cosine), 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

Rubber band editing is analogous tostretching a rubber
band between two thumbtacks. A cursor is placed

between the thumbtacks which can be moved in either
theXor they direction.The waveform is then stretched
from each thumbtack to the cursor in real time.

1.2.3 Digital Amplitude and Digital Offset

The sectionof the waveform that is between the thumb­tacks can beadjusted in amplitude and offset in real time
without affecting the rest of the waveform.

1.2.4 Point Edit

Individual points of the waveform can also be adjusted
in real time.

1.3 STANDARD FEATURES

1.3.1 81 92 x 4095 Point Waveform Resolution

The waveforms have a vertical resolution of 4095 points
and a horizontal resolution adjustable from 2 to 8192
points. The waveform memory is broken up into four
blocks of 2048 horizontal points. This can be used as one
waveform of up to 8192 points or as four different
waveforms (one active and three stored) of up to 2048
points each.

1.3.2 Crystal Controlled Frequency

The waveform clock (sample frequency) is crystal con-

trolled and adjustable from 20

mHz to 2 MHz (500 ns to

50s), allowing a waveform periodof 1 ps to 11 3.8 hours.
The frequency is adjustable as either waveform fre­quency, waveform period, or sample frequency. An

external

TTL

level clock of up to 2 MHz can also be used

as the waveform clock (sample freq).

1.3.3 Operating Modes

The Model 75 can operate in continuous, triggered,
gated, toggled, or burst modes. All modes except con­tinuous are initiated (triggered) by either a front panel

pushbutton or an external signal. In these modes the
waveform stops at break points which can be inserted
anywhere in the waveform (by default one breakpoint will
be at the start address), then waits for another trigger.

In burst mode, a predetermined number of waveforms
(from

1

to 1,048,575) is generated before stopping.

1.3.4 Internal Waveform Counter

In gated, toggled, and burst modes an internal counter
can be used to display the number of complete
waveforms since the last trigger. This is particularly
useful for monitoring a 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 ramp is adjustable from

0 (instant return tostart) to

100 ms per vertical point.

1.3.7 Stored Waveforms

Three additional waveforms may be stored (with their
parameter settings) in waveform memory. These may
later be recalled into, or exchanged with the active
waveform. This feature is only available with horizontal
resolutions of 2048 points or less.

1.3.8 Nonvolatile Instrument Setup

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

Several Model 75's can be connected in series, each one
producing a burst of waveforms, with their outputs

summed together (using the "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

Several Model 75's can be connected in parallel to create
phase coherent arbitrary waveforms. The phase relation­ship is completely adjustable with a resolution equal to
the horizontal resolution of the waveform. This feature
is useful in three axis mechanical testing and multi-phase
power applications.

1.3.1 1 Communications Options

Either an IEEE-488or RS232Ccommunication interface
is available to transfer 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 memory between thumbtacks automatically,
and then edited with the waveform editing functions if
desired.

1.4.2 Operational Modes

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 in the waveform with the default break point
at the beginning of the waveform.

Gated
Same as triggered mode except that the output is con­tinuous for the duration of the gate signal and until the
first break point encountered after the gate signal ends.

Burst

Same as in the triggered mode except that a program-

mable number of waveforms is counted before the

waveforms stop. The maximum burst is 1,048,575
waveforms.

Toggled
The output is quiescent until triggered. It then runs con­tinuously until another trigger stops the waveform at the
next break point.

1.4.3 Waveform Resolution

Normal Waveform
2048 points horizontal

x

4095 points vertical.

Chained Waveform
81 92 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 Period and Frequency
The actual waveform period is the number of horizontal
points (from start to stop address) times the sample time.
This can range from 1 microsecond for a square wave
to 11 3.8 hours for a waveform using all 81 92 points.

Frequency Resolution
4 digits

Frequency Accuracy

+

0.01 5

'10

Repeatability (24 Hr)

+

25 ppm

Temperature Coefficient

<5 ppml°C

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1.4.5

Output Signals Z-Axis Out

Amplitude

This signal is a pulse, adjustable in amplitude from 2 to

14 volts, that is used to modulate the Z-axis of an

Range:

+

0.005 to 5 Vp into 509 (0.01 to 10 VP-P into

oscilloscope when using the waveform editingfeatures.

509). + 0.01 to 1 OVp into an open circuit (0.02 to 20Vp-p

The logic polarity is also selectable.

into an open circuit).
Resolution: 3 digits.
Accuracy:

+

1.8% of setting and + 2.5 mVfor amplitude

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.

The signal at this input is added to the arbitrary waveform

+

1.8% of setting and + 25 pV for 50 mV > amplitude

to produce an output (at waveform out)of the sum of the

+

offset.

two. A peak input of

+

5V w~ll produce an output equal

Repeatability (24 Hr):

k

0.1

O/O

of setting.

to the amplitude setting. Input is fuse protected.

Tem~erature Coefficient: 61 50 ppml°C of setting.

Accuracy is

4% (2% if internal fuse is shorted).

Offset

Trig In (TTL)

lm~edance is 100 KR. Sianal is used to control the

Range:

+

5~ to - 5V into 50R

(-

10V to + 1 OV into an

ge"erator in the trigger, gaie, toggle, and burst 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.

lkpedanbe is 100 KR. A high input causes the waveform

Accuracy:

2% of setting and + 15 mV 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 1.5 mVfor 0.5V>amplitude + off-

parallel operation.

set 250

mV.

Ref In (TTL)

2% of setting and + 0.1 5 mV 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

+

5 Vp into 50R. Output is fuse protected.

Sync Out

(TTL)
Will drive up to 10 LSTTL loads.This is a pulse 1 sample
time wide that is usually used to sync an oscilloscope
or another ARB generator. Pulse position is adjustable
to any point in the waveform.

Burst Done Out (TTL)
Will drive up to 10 LSTrL loads. ATTL low indicates that
the waveform is running. TTL high indicates that the
instrument is waiting for a trigger in triggered, gated,
toggle, or burst modes. Used primarily 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 in series operation or
in parallel operation.

Hold In
Impedance is 100 KR. ATTL low or switch closure at this
input causes the generator to stop at the current output
level and remain there until released by a TTL high or

switch opening.

Return In
Impedance is 100 KR.

ATTLlowor switch closureat this

input causes the output level to ramp back to the start

value.

'The ramp rate is front panel selectable from 0 to

100 ms per point.

1.4.8

Trigger Sources

Manual
Use the Trigger pushbutton switch on front panel to
operate internal trigger circuitry. The slope polarity can
be set via the display menus.

External
Use the communication

ports(GPIB or RS-232C)or the

Trig In connector on front panel. Trig In connector fre­quency input can be up to 1 MHz. The slope polaritycan
be set via the display menus.

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1.4.9 Waveform Characteristics

Horizontal Resolution
Up to 81 92 points.

Vertical Resolution
4095 bits

(

-

2047 to + 2047).

RiselFall Time

<350 ns.

1.4.10 Communication Ports (Optional)

IEEE-488 Port (Option 001)

Type:

IEEE-488-1978 compatible, 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-C Serial Port (Option 002)

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).

1.4.1 1 General
Environmental

Temperature Range: + 23°C + 5°C for specified opera­tion, operates

0 to + 50°C, - 20 to + 75°C for storage.

WarmupTime: 20 minutes for specified(guaranteed for
1 year) operation.

Vibration: 5 to 55 Hz with maximum of

29 at 55 Hz.

Shock:

309, 11 ms half sine.

Altitude: Sea level to 10,000 ft. 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 (8.27 in.) wide,

10 cm (3.94 in.) high,

32.3 cm (1 2.72 in.) deep.

Weight: 3.55 kg (7.8 Ib) net, 4.68 kg (1 0.3 Ib) shipping.

Power: 90 to 128,180 to 256 rms; 48 to 66 Hz; 1 phase;

<25 VA.

1.4.1 2 Options

001: IEEE-488 (GPIB) Port

For instrument control or entering waveform data.

002:

RS-232-C Serial Port

For instrument control or entering waveform data.

NOTE

Options

001

and

002

are mutually exclusive.

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INITIAL PREPARATION

2.1 UNPACKING INSPECTION

After carefully unpacking the instrument, visually inspect
all external parts for possibledamage toconnectors, sur­face areas, etc. If damage is discovered, filea claim with
the carrier who transported the unit. The shipping con­tainer and packing material should be saved in case
reshipment is required.

2.2 ELECTRICAL INSTALLATION

2.2.1 Power Connection

WARNING

To preclude injury

ordeath due toshock, the

third wire earth ground must be continuous
to the facility power outlet. Before connect-

ing to the facility power outlet, examine
extension cords, autotransformers, etc.,
between the instrument and the facility power
outlet for acontinuous earth ground

path.The
earth ground path can be identified at the plug
on the instrument power cord; of three ter­minals, the earth ground terminal is the non­matching shape, usually cylindrical.

CAUTION

To prevent damage to the instrument, check
for proper match of line and instrument
voltage and proper fuse type and rating.

Line Voltage

Refer to table 2-1 to determine the proper selection of
the line voltage connector. Unless otherwise specified
at the time of purchase, this instrument was shipped from
the factory with the power transformer connected for
operation on a

1 1

5

Vac line supply and with a 318 amp

fuse. If the unit is shipped for

11

5

Vac operation, there

will be no markings or tags on the unit. If the unit is

shipped for 220

Vac operation, there will be a 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 remove the top and bottom covers.

Remove the top and bottom using the following steps and
figure 2-1.

1. Remove two (2) screws holding top and bottom
covers to rear panel.

2. Slide both covers (together as a unit) to the rear and
remove from the chassis assembly.

Figure 2-1. Top and Bottom Cover Removal

After the covers have been removed, the line voltage can
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 Inspection Hole

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2.2.3 Fuse and Voltage Selection

If

the line voltage is not correct according to table 2-1,

perform the following steps and refer to figure 2-3 for
steps 1 and 2, and figure 2-4 for steps 3 thru 6

tochange

the line voltage and fuse.

1. Remove the two screws holding guard plate to the
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. Remove the voltage selector connector from the ac

primary board. Rotate the connector until the cor­rect voltage selector indicator is on top.

4. Reinstall the voltage selector connector.

5. Remove the fuse and install new fuse as called out
in table

2-1.

Connector Voltage

Position Range

90

to 128 Vac 318 amp

Table 2-1. VoltagelFuse Selection

220V

WARNING

Because lethal voltages are exposed, do
not apply ac power to the unit until the
guard plate is attached to the unit.

Reassembly

Refer to figure 2-5 for step 1 and figure 2-6 for steps 2
thru 5.

1. Insert the guard plate over the ac primary board and
voltage selector connector and align with screw
holes in the rear panel. Secure with two screws.

180

to

256 Vac

BOARD

311 6 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
bottom cover over the guard shield and rear panel.

Slide the bottom cover forward approximately two

(2) inches while engaging the

topcover shield slides
(see figure 2-6, detail A) and the outside slide rails
(see figure 2-6, detail B).

3.

Turn the instrument right side up. Install the topcover
using the same procedure as in step

2.

4. Align the rear of both the topand bottom cover with
each each other so that the cover interlocks are
properly mated. Once mated, hold the covers firmly
together and slide the chassis assembly into top and

bottom covers.

CAUTION

When sliding on the bottom cover, avoid

moving the ribbon cables located

nearthe

power transformer.

5. Secure covers to unit using two screws as shown
in figure 2-1

.

2.2.4

Signal Connections

Use RG58U 509 coaxial cables equipped with BNC con­nectors to distribute signals when connecting this instru­ment to associated equipment.

NOTE

Signal ground may be floated up to

_t

42V

with respect to chassisground. Bea ware that
all signal grounds are common and must 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

The terms

"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
changed by resetting the internal DIP switch (for access,

remove the top cover, see paragraphs 2.2.2 and 2.2.3)
or changed temporarily by pressing the front panel ADRS
soft key and rotating the Control knob when the GPlB
address is displayed.

The switch sections are labeled from 1 thru 5 and their
OPEN position noted (OPEN

=

Binary "0" in table 2-2).

To verify the address, press ADRS soft key on the 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-232C 110 rear panel pin connections and signal

names are given in table

2-3. The panel connector is a
DB-25 female connector (see figure 2-7) and will con­nect to a standard

RS-232C cable (interface type

E).

The data format is an 8-bit, no parity, one stop bit. The
baud rate is selectable from those listed in table 2-5 using
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~equest to Send
4~lear to Send
'Data Set Ready

'Receive Line Signal Detect

7~ata Terminal Ready

Pin

2

3

4

5

6

7
8

20

-

/

RS-232-C Connector

Name

TXD'
RXD~

RTS3
CTS~
DSR5
SIG GRD
RLSD'

DTR~

Direction (DCE
Configuration)

IN

OUT

N IC
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.
In the DCE configuration, pins 2 and 3 are data input and

output respectively and must be used. Pin 5 may be used

to indicate that the Model 75 is ready to receive data.

Pin 20 tells the Model 75 that the connected device is
ready to receive data, but may be connected to pin 6 of

the Model 75 if the other device is always ready. Pin 7

is signal ground and must be used. Pins 6 and 8 will be

positive (asserted) when the Model 75 is on.

In the 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

Model 75 that the connected device is ready to receive
data.

If

the other device is always ready, pins 4 and 5
of the Model 75 may be connected together. Pins 6 and
8 are properly terminated inputs but have no function.
Pin

20

will be positive when the Model 75 is ready to

receive data. Pin 7 is signal ground and must be used.

1. Determine if the other device is a DCE device or a
DTE device. If this is not explicitly spelled out you
will need to look at the pin out for its connector. If

pin 2 is the 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

internal optioncable to theappropriate

header(see

figure 2-8).

In most cases a straight through cable can be used

to connect the Model 75 with the other device. The

Model 75 only requires the connection of pins 2, 3,
5,7, and 20 but the other device may require more.
Examples of typical cable assemblies are shown in

figure

2-9. However, there are many interpretations

of the

RS-232Cstandard and either of the following
procedures (a or 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 configured as a DCE then;

CTSIDTR (hardware) or XONIXOFF (see paragraph 3-32
for more information).

(1) Pin 7 (signal ground) is always connected

straight through.

2.2.8 Connecting the RS-232-C Interface

Before connecting the Model 75 using the RS-232C

interface, the correct configuration (DCE or DTE) must
be selected and the internal ribbon cable connected to
either the DCE or DTE location (see figure 2-8) on the
RS-232-C option board. To determine which configura­tion is correct, you will need the manual for the device
to which you are connecting the Model 75. The follow­ing assumes that the other device has a DB-25,
RS-232-C connector.

DCE

HEADER

Figure 2-8. Baud Rate Switch and DTElDCE

Connections

(2) Pins 2 and 3 are connected straight through

if

DCEIDTE configuration is correct.

(3) Pin 5 of the Model 75 will need to be con-

nected to 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
handshaking will be required and pin 5 can
be left disconnected.

(4) Pin 20 of the Model 75 should be connected

to an output pin on the other device that

indicates when it is ready to accept data.
If the other device does not have such 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 is

always ready

toaccept data, this pin can be
connected to an always positive pin on the
other

deviceor topin 60r 8on the Model 75.

(5) Pins 6 and 8 are always positive when the

power is on and can be connected to any
pins on the other device that require being

held positive.

b. If the Model 75 is configured as a DTE then;

(1) Pin 7 (signal ground) is always connected

straight through.

(2) Pins 2 and 3 are connected straight through

if

DCEIDTE configuration is correct.

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(3) Pin 20 of the Model 75 will need to be con-

nected to an input of the other device that
will enable (positive) and disable (negative)
the character transmission from that
device. If the other device does not support
this,

XONIXOFF handshaking will be

required and pin

20 can be left dis-

connected.

(4)

Pin 5 of the Model 75 should be connected
to an output pin on the other device that

indicates whether or not it is ready to accept
data. If the other devicedoes not have such
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 is always ready to accept data, this

IBM-PC

APPLE

II

WITH SUPER SERIAL CARD

IBM-PC IN COMMUNICATIONS 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)

D 6-25
MALE

D 6-25 DE-9

MALE MALE

Figure

2-9.

Typical Examples

of

Serial Cables

DB-25
MALE

2-6

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pin can be connected to an always positive
pin on the other device or to pin 4 on the
Model 75.

(5) Pin 4 is always positive when the power is

on and can be connected to any pin on the
other device that requires being held
positive.

(6) Pins 6and 8are properly terminated inputs

but have no function.

NOTE

Anypins not mentioned in the previous list are

not connected in the Model

75and therefore
can be connected to anything if the connec­tions are already present in the cable.

3. The handshaking method is front panel selectable
as

CTSIDTR (hardware) or XONIXOFF (see para-

graph 3.31 for more information).

4. Set the baud

rateon the Model 75 to the highest rate
that is available on both the Model 75 and the other
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 the ARB Out connector that can
be modified at will using the front panel controls. In order
toverify the operation of the controls and the functions1
modeslvalues that they control, the generator must first
be set up to produce an output and then the effect of the
controls on the output and the display indications noted.
While this procedure verifies functional operation of this

instrument, it does not verify the

calibration.Thevalues
shown are typical values and should only be used as a
guide. Required tools and test equipment are shown 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

Dual channel. 20 MHz rnin band­width with external trigger and Z­axis capability.

2% accuracy, 2W

1 male to 2 female

RG58U, Q 3 ft. length (4 each)

1 MHz capability with square
wave (1 0 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.

*A second Model 75 can be used as the signal source.

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, 10 Vp-p
signal, use the STOP soft key to set the stop address
to 1999, use the FREQ soft key to set 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 in table

2-6.
Refer to the referenced figures and tables for appropriate
test equipment connections and settings. Refer to figure
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.

--

-

-

This step verifies the "Reset" functions of the Model 75.

Press three times

Press once
Press once

2

Display indicates "RESET Ver

x.xx".

Display indicates "RESET Ver x.xx

X".

Setup
F2 (Reset)
F3 (Exec)

This step 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".

Rotate CCW 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.

Display indicates "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-going pulses. Leave Setting at "ZLEVEL
2V".

This step sets the "Z-Axis Out" voltage level and polarity.

Control knob Rotate CW or CCW

to set acceptable
contrast between
trace and thumb-

tacks. Adjust oscillo­scope intensity if

required.

Connect the Model 75 as shown in figure 2-1 1. Set
equipment controls as indicated in table

2-8.

If thumbtack intensity is too bright at + 2V, terminate
the Z-axis cable with a 50Q load. If the thumbtacks are
dimmed instead of intensified, set ZLOGIC to POS.

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Table 2-6. Checkout Procedure (Continued)

This step verifies the "Waveform Memory'' functions of the Model 75.

Store
F2 (CHAIN)

Control knob

ObservationlComments

F3 (EXEC)
Edit
F1 (FUNC)
Control knob

PositionlOperation Step

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)

Press two 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
Rotate CW

Rotate CCW

Press once
Rotate CCW

Rotate CW

Press two times
Press once
Rotate until display

indicates "CHAIN
2K".

Press once
Press two times
Press once

Press once

Reset the oscilloscope horizontal sweep to 1

msIDIV.

Oscilloscope will indicate slightly more than one cycle
of the sine wave at approximately 10 Vp-p.

Display will indicate

">ST = 0000 SP = 8191

".

Oscilloscope waveform start point will move from left
to right until waveform disappears. Display will now

indicate

">ST = 81 91 SP = 81 91

".

Oscilloscope waveform start point will move from right
to left until waveform is complete. Display will now

indicate

">ST = 0000 SP = 81 91

".

Display will indicate "ST = 0000 >SP = 81 91.

Oscilloscope waveform stop point will move from right
to left until the waveform disappears. The display will

now indicate "ST

=

0000 >SP = 0000".

Oscilloscope waveform stop point will move from left
to right until the waveform is complete. The display

will

now indicate "ST = 0000 >SP = 81 91

".

Display indicates "CHAIN 8K"

Display indicates "FUNC SINE".

Set the oscilloscope sweep to

.5

mslDIV.

Display will indicate "FUNC SINE X". Oscilloscope
will display less than 3 cycles of a sine wave of approx­imately 10 Vp-p.

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Table

2-6.

Checkout Procedure (Continued)

This step verifies the "Amplitude Control" functions of the Model

75.

Step

This step verifies the "Offset" functions of the Model

75.

ControllSwitch

Display will indicate "AMPL 5.000 Vp".

Oscilloscope amplitude decreases smoothly to
minimum of approximately

10 mVp-p. Display will now

indicate "AMPL 5.00

mVp".

6

This step verifies the "Frequency" functions of the Model

75.

PositionlOperation

7

ObservationlComments

Parameter
F1 (AMPL)

Control knob

Press two times
Press once
Rotate CCW

F2 (OFFSET)

Control knob

Control knob

Control knob

F1 (AMPL)

Control knob

F3 (SAMPL)

Connect a coax cable from the Ref Out connector on
the Model 75 rear panel to the frequency counter input.
Set frequency counter to frequency mode.

Press once

Control knob

Display will indicate "SAMPL 1.0000 MHz'' and counter
will indicate approximately 1 MHz.

Press once

Rotate CW

Rotate CCW

Rotate CW until
display indicates
"OFFSET 0.0

mV".
Press once
Rotate CW until

display indicates

"AMPL 5.000 Vp".

Rotate CCW until

display indicates

"SAMPL 500.0
KHz".

Counter will indicate approximately 500 kHz.

Display will indicate "OFFSET 0.0

mV".

Reset oscilloscope vertical gain to 2VIDIV.

Oscilloscope will increase smoothly to approximately

5.1 OV. The display will now indicate

"OFFSET5.1 OV".

Oscilloscope level decreases smoothly to

approxi-

mately - 5.10V. Display will now indicate "OFFSET

-

5.10V".

Resolution near zero is much greater so that the level
will change slower as zero is approached and passed.

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Table

2-6.

Checkout Procedure (Continued)

This step verifies the "Hold" functions of the Model

75.

-

9

1

Hold

ObservationlComments

Counter will indicate approximately 300 kHz.

Counter will indicate approximately 100 kHz.

Counter will indicate approximately 10 kHz.

Counter will indicate approximately 1 kHz.

Counter will indicate approximately 100 Hz.

Set frequency counter to measure period.

Counter will indicate approximately 100 ms.

Counter will indicate approximately 1

sec.

Counter will indicate approximately 10 sec.

Oscilloscope will indicate a slow sine wave of

10Vp-p.

Press once

PositionlOperation

Rotate CCW until

display indicates

"SAMPL 300.0

KHz".
Rotate CCW until

display indicates
"SAMPL 1 00.00

KHZ".
Rotate CCW until

display indicates

"SAMPL 10.000
KHz".

Rotate CCW until
display indicates
"SAMPL 1.0000
KHz".

Rotate CCW until
display indicates
"SAMPL 100.00
HZ".

Rotate CCW until
display indicates

"SAMPL 10.000
HZ".

Rotate CCW until
display indicates

"SAMPL 1.0000
HZ".

Rotate CCW until
display indicates

"SAMPL 100.00

mHZ".
Rotate CW until

display indicates

"SAMPL 1.0000

KHz".

Step

8

(Cont)

Display indicates

"H0LD:ON". Oscilloscope indicates

that waveform stops at instantaneous dc level.

ControllSwitch

Control knob

Control knob

Control knob

Control knob

Control knob

Control knob

Control knob

Control knob

Control knob

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Table

2-6.

Checkout Procedure (Continued)

9

(Cont)

Hold

Step

Press once

ControllSwitch

PositionlOperation

Apply a 7TL low or
switch closure input
connector.

ObservationlComments

Remove the 7TL low

or switch closure

from the rear panel
connector.

Oscilloscope waveform starts again.
Connect a coax cable from the

7TL source output to

the Hold In connector on the Model

75

rear panel.

Oscilloscope indicates that waveform stops at
instantaneous dc level.

Oscilloscope indicates that waveform starts again.

Return

Hold

This step verifies the "Return" functions of the Model

75.

Press once

Press once

Apply a

7TL low or
switch closure input
to the rear panel
connector.

Oscilloscope indicates that waveform stops at instan­taneous dc level and moves slowly to approximately

0

Vdc. Display indicates "H0LD:ON

Y

=

0000".

OsciIloscope waveform starts again. Display indicates

"HOLD:OFFM.

Connect a coax cable from the TrL source output to
the Return In connector on the Model

75

rear panel.

Oscilloscope indicates that waveform stops at instan­taneous dc level and moves slowly to approximately

0

Vdc. Display indicates "H0LD:ON

Y

=

0000".

Remove the 7TL low or switch closure input from the
rear panel connector.

I

Hold press once Oscilloscope indicates that waveform starts again.

This step verifies the "Mode" functions of the Model

75.

I

Parameter

F1

(MODE)

Control knob

Trigger

Press two times

Press once

Rotate CW until dis-

play indicates

"MODE

TRIGGERED".

Press once

Oscilloscope trace level approximately

0

Vdc. Set

oscilloscope sweep to

.5

seclDIV.

Oscilloscope waveform runs for one cycle, then stops
at

0

Vdc.

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Table

2-6.

Checkout Procedure (Continued)

This step verifies the "Burst Done Out" signal of the Model 75.

0

bservationlComments

Oscilloscope waveform runs continuously.
Oscilloscope waveform stops at

0 Vdc.

Oscilloscope waveform runs continuously.
Oscilloscope waveform stops at

0 Vdc.

Oscilloscope waveform runs for 3 cycles, then stops
at

0 Vdc.

Display will indicate "COLINTER

=

3".

This step verifies the "Trig In" functions of the Model 75.

PositionlOperation

Rotate CW until

display indicates

"MODE GATED".
Press and hold
Release
Rotate CW until

display indicates

"MODE TOGGLED".
Press once
Press once
Press once

Rotate CCW until
display indicates

"BURST CT

3".
Press once
Rotate CW until

display indicates

"MODE BURST".

Press once

Press once

Step

11

(Cont)

12

Connect the Model 75 as shown in figure 2-12. Set
equipment controls as indicated in table

2-9.

ControllSwitch

Control knob

Trigger
Trigger
Control knob

Trigger
Trigger

F3 (BLIRST)

Control knob

F1 (MODE)

Control knob

Trigger

Counter

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Trigger Press Once

Connect a cable from Burst Done Out connector to
oscilloscope CH 2 vertical input. Reset oscilloscope
vertical input to CHOPPED with

CHI and CH2 both

"On" and at

2VIDIV.

Oscilloscope Burst Done Out signal goes to OVdc while

waveform is running and then returns to

+

5V when

waveform stops.

Table

2-6.

Checkout Procedure (Continued)

This step verifies the "Trigger Slope" function of the Model

75.

7

Parameter

1

press two times

Step

13

(Cont)

PositionlOperation

Press once
Rotate CW until

display indicates

"MODE

TRIGGERED".
Press once
Press once
Rotate CW until

display indicates
"FREQ

900.00

HZ".

ControllSwitch

F1 (MODE)

Control knob

Parameter
F1 (FREQ)

Control knob

1

Control knob

)

Rotate CW until

ObservationlComments

Oscilloscope displays one cycle of sine wave whose
start is coincident with rising edge of the trigger signal.

I

F2(TRSLP)

Oscilloscope displays one cycle of sine wave whose

Press once

This step verifies the "Sync In" functions of the Model

75

display indicates
"TRIG SLOPE NEG".

start is coincident with falling edge of the trigger signal.

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Move the cable from the Trig In connector to the Sync

In connector.

Oscilloscope waveform runs continuously when the
Sync In signal is low. Waveform goes to

0

Vdc when

Sync In is high.

15

This step verifies the "Ref In" functions of the Model

75.

F1 (MODE)

Control knob

16

Press once
Rotate CCW until

display indicates
"MODE

CONTINUOUS".

Press two times

Parameter

Connect the Model

75

as shown in figure 2-13. Set

equipment controls as indicated in table 2-1

0.

Table 2-6. Checkout Procedure (Continued)

F3 (REF)
Control knob

TTL

Signal

source

ObservationlComments

Press once

Rotate CW until

PositionlOperation

Step

display indicates

"REF EXTERNAL".

ControllSwitch

Vary the frequency

up and down.

Oscilloscope waveform frequency varies with the
TTL frequency.

Control knob

Edit
F1 (FLINC)

Control knob

This step verifies the "Sum In" functions of the Model

75.

Rotate CW until

display indicates

"REF INTERNAL"
Press two times
Press once

Rotate CW until
display indicates

"FUIVC DC".

1

F3 (EXEC)

I

Press once

Connect the Model

75

as shown in figure 2-14. Set

equipment controls as indicated in table 2-1 1.

Oscilloscope

(CHI) waveform is the same frequency

and approximately the same amplitude as the

(CH2)

waveform.

Z-AXIS

OUT

I

MODEL

75

I

OSCILLOSCOPE

Figure 2-10. Equipment Interconnection #1

Table 2-7. Test Equipment Control Setup#l

Oscilloscope

CHI Vert Input

5

VIDIV

Horiz Sweep

.5

mslDlV

Trigger Source

CHI
Trigger Mode Auto
Remaining Controls As Required

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Figure 2-1 1.

Equipment lnterconnection

#2

Table 2-8. Test Equipment Control Setup #2 Table 2-9. Equipment Control Setup #3

Oscilloscope

CHI Vert Input 2 VlDlV

Horiz Sweep

.5

mslDlV

Trigger Source

Ext

(

-

10 if available)

Trigger Mode

Auto

Trigger Slope

Positive

Trigger Coupling

AC

Remaining Controls As Required

TTL SIGNAL SOURCE MODEL

75

OSCILLOSCOPE

50Q

00000000

..@ @ @ @

@

0

TRIG

ARB

IN

OUT

TTL Signal Source

Frequency 200 Hz
Function

TTL

Figure 2-12. Equipment lnterconnection #3

Oscilloscope

CHI Vert Input

2

VIDIV

CH2 Vert Input

2

VIDIV

Vert Mode Alt
Horiz Sweep

.5

ms1DIV

Trigger Source CH2

Trigger Mode Auto
Trigger Slope Positive

Trigger Coupling AC

Remaining Controls As Required

2-1

6

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Figure 2-1

3.

Equipment lnterconnection #4

TTL SIGNAL SOURCE

MODEL 75 OSCILLOSCOPE

SIG

OUT

Q

Table 2-10. Test Equipment Control Setup #4 Table 2-1 1. Test Equipment Control Setup #5

Frequency 1 .OO

KHz

Function Square

Wave

Amplitude 1 0 Vp-p

REF

IN

-

TTL Signal Source

Frequency 1 MHz
Function

lTL

Signal Source

CHI Vert Input 2 VIDIV

SYNC

OUT

Oscilloscope

CHI Vert Input 2 VIDIV
Trigger Source Ext (-10 if

avail)

Horiz Sweep

.5

ms1DIV

Trigger Mode

Auto

Trigger Slope

Positive
Trigger Coupling AC
Remaining Controls As Required

Oscilloscope

CH2 Vert Input 2 VIDIV

'rn-mo'

0

0

.

-

-

...

.

OOOOOOOO0

@

L@

@

69

@

..q

ARB

OUT

Vert Mode Alt

Horiz Sweep

.2 ms1DIV
Trigger Source CH2
Trigger Mode Auto
Trigger Slope Positive
Trigger Coupling AC
Remaining Controls As Required

50Q

cl

CH2

,;

-

0

Q

SIGNAL SOURCE MODEL 75 OSCILLOSCOPE

CH2

0

SUM

ARB

IN

OUT

Figure 2-14. Equipment lnterconnection #5

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r

WAMTCK:

1

San

Dleao

CA USA

-

I

MODEL

75

I

BEFOREOPENING UNPLUGPOWEO
CORD DANGEROUS

VOLTAGES

INSIDE SEE MANUAL FOO SAFETY

IY9TFtllCTIOII

Z

AXIS

out

IEEE-488

(600nI

Ref Ref

Hold

Return

In

Out

In In

(TTL)

(TTLI (TTL)

(TTL)

Figure

3-1.

Controls, Connectors, and Indicators

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3.1 INTRODUC'I'ION

This section describes the operation of the Model 75.

Paragraph 3.2 describes the controls and connectors

of the instrument. The following paragraphs describe

how to use the various features and modes of the Model

75.

3.2 CONTROLS, CONNECTORS, AND INDICATORS

The front panel controls are organized into four menu

selection keys, three soft keys, three real time keys, the
Counter key, and the Control knob. To change any instru­ment setting, the appropriate menu key is pressed

repeatedly until thedesiredsoft key labelappears in the
bottom line of the display (see Appendix B for menu
organization). Pressing the associated soft key will cause

the top line of the display to indicate the setting to be

changed. Rotating the Control knob will change the

setting. When the setting being changed has the

possibility of irreversibly changing a waveform, an

execute label (EXEC) will appear for the F3 soft key and

must be pressed before the change takes place. The

Trigger, Hold, and Return keys control the waveform in

real time and are not directly associated with the Con­trol knob. The Counter key causes the display to indicate
a waveform count as will be discussed below. The front
panel controls and connectors are shown in figure 3-1
and keyed (bold numbers) to the following descriptions.

W-TEK

Arbitrar, Waveform Generator

FFtEl;!

F;ER

;!;RplFL

1 Liquid Crystal Display

(See figure 3-2). The lower

row of this display will provide labels for the soft keys
that are located directly below the display. Each time
one of the menu keys is pressed the labels will be
updated to match the menu selection (see Appen­dix B). The upper row of the display will respond to
the soft keys and control knob by indicating the
setting or parameter value corresponding to the last
soft key that was pressed.

2

LCD Viewing Control.

This control allows the user
to adjust the intensity of the display to match the
viewing angle of the instrument.

3 Edit Key.

Each time the edit key is pressed the lower
line of the display will change to indicate three dif­ferent waveform editing options. There are a total
of five different sets of three editing options. Any of
these can be invoked by pressing the soft key

[Fl

(21), F2 (1

9),

or F3 (1 7)] below the corresponding

label on the display.

NOTE

Refer to appendix B for a summary of soft key
options.

'

WAVETEK

Arbitrary Waveform Generator

L

FREQ SELECTED FROM PARAMETER MENU

ADJX

SELECTED FROM EDIT MENU

Figure 3-2. Typical Display Indications

3-1

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