Wavetek 1395, 1395 Mate Operation And Maintenance Manual

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SM

View

Instra

OPLKATION

AND

MAIN

I

ENANCL

MANUAL

Model

l395/1395

Mate

50

MHz

VXIbus Arbitrary

Waveform

Synthesizer

O

1996 Wavetek

Ltd

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.

Wavetek

Ltd.

Hurricane

W'q,

Norwich Airp~)rt Industrial

Estatc

Nurwch
Nl~rfolk Nllh hJ13

I1K

Manual Revision

C,

6195

Manual Part Number 1006-00-0699

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WARRANTY

Wavetek warrants that all products manufactured by Wavetek conform to published Wavetek
specifications and are free from defects in materials and workmanship for a period of one

(1)

year from the date of delivery when used under normal conditions and within the service condi­tions for which they were furnished.

The obligation of Wavetek arising from a Warranty claim shall be limited to repairing, or at its
option, replacing without charge, any product which in Wavetek's sole opinion proves to be
defective within the scope of the Warranty. In the event Wavetek is not able to modify, repair or
replace non-conforming defective parts or components to a condition as warrantied within a
reasonable time after receipt thereof, Buyers shall be credited for their value at the original
purchase price.

Wavetek must be notified in writing of the defect or nonconformity within the Warranty period
and the affected product returned to Wavetek's factory or to an authorized service center within

(30)

days after discovery of such defect or nonconformity.

For product warranties requiring return to Wavetek, products must be returned to a service
facility designated by Wavetek. Buyer shall prepay shipping charges, taxes, duties and insurance
for products returned to Wavetek for warranty service. Except for products returned to Buyer

from another country, Wavetek shall pay for return of products to Buyer.

Wavetek shall have no responsibility hereunder for any defect or damage caused by improper
storage, improper installation, unauthorized modification, misuse, neglect, inadequate mainte­nance, accident or for any product which has been repaired or altered by anyone other than
Wavetek or its authorized representative and not in accordance with instructions furnished by
Wavetek.

Exclusion of Other Warranties

The Warranty described above is Buyer's sole and exclusive remedy and no other warranty,
whether written or oral, is expressed or implied. Wavetek specifically disclaims the implied
warranties of merchantability and fitness for a particular purpose. No statement, representation,

agreement, or understanding, oral or written, made by an agent, distributor, representative, or
employee of Wavetek, which is not contained in the foregoing Warranty will be binding upon
Wavetek, unless made in writing and executed by an authorized Wavetek employee. Under no

circumstances shall Wavetek be liable for any direct, indirect, special, incidental, or consequen-

tial damages, expenses, losses or delays (including loss of profits) based on contract, tort, or any

other legal theory.

This product complies with the requirements of the following European Community Directives:

Cf

89/33B/EEC

(Electromagnaic

Compatiblllty)

and

731231EEC

(Low

Voltage)

as amended

by

93/68/EEC (CE

Marking).

However, noisy or intense electromagnetic fields in the vicinity of the equipment can disturb the measurement
circuit.

Users should exercise caution and use appropriate connection and cabling configurations to avoid

misleading results when making precision measurements in the presence of electromagnetic interference.

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SAFETY

FIRST

PROTECT YOURSELF.

Follow these precautions:

Don't touch the outputs of the instrument or any exposed test wiring
carrying the output signals. This instrument can generate hazardous voltages and
currents.

.

Don't bypass the

VXI

chassis' power cord's ground lead with two-wire

extension cords or plug adaptors.

.

Don't disconnect the green and yellow safety-earth-ground wire that

connects the ground lug of the

VXI

chassis power receptacle to the chassis

ground terminal (marked with

@

or

a

).

Don't hold your eyes extremely close to an rf output for a long time. The

normally nonhazardous low-power rf energy generated by the instrument could

possibly cause eye

injury.

Don't energize the

VXI

chassis until directed to by the installation

instructions.

.

Don't repair the instrument unless you are a qualified electronics techni-

cian and know how to work with hazardous voltages.

.

Pay attention to the

WARNING

statements. They point out situations

that can cause injury or death.

.

Pay attention to the

CAUTION

statements. They point out situations that

can cause equipment damage.

CONTENTS

iii

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CONTENTS

SECTION 1 GENERAL

1.1 THE MODEL 1395

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

1-1

1.2 SPECIFICATIONS

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

1-1

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

1.2.1 Waveforms (Functions) 1-1

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

1.2.2 ARB Waveform Creation and Editing 1-1

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

.

1 2.3 Operational Modes 1-2

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

1.2.4 Input and Output Specifications 1-2

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

1.2.4.1 Outputs 1-2

1.2.4.2 Inputs

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

1-4

1.2.5 Waveform Characteristics

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

1-5

1.2.6 Frequency

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

1-6

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

1 .2. 6.1 Arb Clock and Waveform Timing: 1-6

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

1.2.7 Amplitude 1-6

1.2.8 Offset

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

1-6

1.2.9 Filtering

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

1-6

1.2.1

0

Linked SEQuence Operation

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

1-7

1.2.11 Sweep

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

1-7

1.2.1 2 Triggering

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

1-7

1.2.1 3 Modulation

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

1-8

1.2.1 4 Intermodule Operation

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

1-8

1.2.15 Frequency List

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

1-9

1.2.1 6 Option

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

1-9

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

1.2.1 7 AutoCal/Diagnostics 1-9
1

.

3 GENERAL

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

1-9

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

1.3.1 SCPl Programming 1-9

1.3.2 VXI Interface

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

1-10

1.3.3 Environmental-

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

1-11

1.3.4 Size

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

1-11

1.3.5 Power

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

1-11

1.3.6 Reliability

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

1-11

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

1.3.7 Cooling Requirement 1-11

1.3.8 Safety

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

1-11

1.3.9 EMC

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

1-11

SECTION

2

PREPARATION

2.1 RECEIVING INSPECTION

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

2-1

2.1.1 Unpacking Instructions

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

2-1

2.1.2 Returning Equipment

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

2-1

2.2 PREPARATION FOR STORAGE OR SHIPMENT

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

2-1

2.2.1 Packaging

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

2-1

2.2.2 Storage

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

2-1

2.3 PREPARATION FOR USE

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

2-1

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

2.3.1 Logical Address Selection 2-2

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

2.3.2 Data Transfer Bus Arbitration 2-2

2.4 INSTALLATION

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

2-4

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

2.5 INITIAL CHECKOUT AND OPERATION VERIFICATION

2-4

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CONTENTS (Continued)

SECTION 3 OPERATION

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

3.1 INTRODUCTION 3-1

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

3.2 CONNECTORS AND LED INDICATORS 3-1

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

3.3 MODEL 1395 PROGRAMMING 3-1

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

SCPl Command Table 3-1
Long and Short Form Keywords

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

3-4

Command Message Format

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

3-4

Program Message Unit

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

3-4

Program Message

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

3-4

Program Message Delimiters

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

3-4

Parameter Forms

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

3-4

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

Program Message Terminators 3-8

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

Queries 3-8
Model 1395 SCPl Commands

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

3-9

CALibration Subsystem

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

3-9

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

INlTiate Subsystem 3-11

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

OUTPut Subsystem 3-11

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

RESet Subsystem 3-13
SOURce Subsystem

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

3-13

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

STATUS Subsystem 3-18
SYSTem Subsystem

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

3-19

TEST Subsystem

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

3-19

Trace Subsystem

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

3-20

TRlGger Subsystem

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

3-22

High Speed Binary Waveform Transfer

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

3-22

IEEE-488.2 Common Commands

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

3-25

3.4 MODEL 1395 OPERATION

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

3-25

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

Output Terminations 3-25

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

Input/Output Protection 3-26

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

Power OnIReset Defaults 3-26

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

Standard Functions (CW) 3-29

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

Trace Operations and USER Function (RAST)

3-29

Trace Definition

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

3-29

Trace Data

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

3-31

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

Trace Copy. Resize. Rename. and Delete

3-32

Trace Limits

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

3-32

Trace Queries

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

3-33

Waveform Download Operations

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

3-34

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

Definite Length Arbitrary Block Transfer 3-34

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

WaveForm DSPTM Download 3-35

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

Shared Memory Transfer 3-37

Non-continuous Modes

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

3-38

Triggered Operation

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

3-39

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

Gated Operation 3-42

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

Sequence Operation 3-42

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

CONTinuous Sequencing 3-42
TRlGgered Mode Sequencing

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

3-45

AMISCM Operation

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

3-45

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CONTENTS (Continued)

SyncIPosition Markers

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

3-46

Frequency Sweep

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

3-47

Sweep Generator

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

3-48

Frequency List

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

3-49

SUMBUS Operation

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

3-49

Clock InpuWOutput Operation

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

3-51

Intermodule Operations

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

3-54

lntermodule Triggering

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

3-54

Intermodule Phase Lock

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

3-58

SECTION

4

CALIBRATION

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

4.1 FACTORY REPAIR 4-1

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

4.2 CALIBRATION 4-1

4.3 REQUIRED TEST EQUIPMENT

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

4-1

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

4.4 PERFORMANCE VERIFICATION PROCEDURE 4-1
Standard Test Equipment

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

4-2

Standard Test Conditions

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

4-2

Test Specifications

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

4-2

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

VXlbus Interface 4-2
Self Test

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

4-2

Function Output OnIOff

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

4-2

Trigger Count

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

4-2

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

Trigger Source 4-3

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

Sine Amplitude Accuracy 4-3

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

Square Amplitude Accuracy 4-4

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

Attenuator Accuracy 4-4

DC Offset Accuracy

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

4-4

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

Frequency Response 4-5

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

Square Waveform Quality 4-5

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

Squarewave Duty Cycle 4-5
Sync Marker Output

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

4-6

Position Marker Output

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

4-6

Clock Output

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

4-6

Clock Input

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

4-6

Frequency Sweep

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

4-6

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

4.5 ALIGNMENT PROCEDURE 4-7

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

4.5.1 Self Calibration 4-7

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

4.5.2 Semi-Automated Procedure 4-7

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

4.5.3 Preparation 4-7

4.5.4 Connector Termination

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

4-8

4.5.5 Alignment Procedure

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

4-8

4.5.5.1 Square Wave Symmetry

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

4-8

4.5.5.2 Square Wave Quality

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

4-8

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

4.5.5.3 SUMBUS Driver Zero 4-9

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

4.5.5.4 Self Calibration 4-9

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

4.5.5.5 SCM Null 4-9

4.5.5.6

Elliptic Filter Amplitude Flatness Correction

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

4-10

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CONTENTS (Continued)

SECTION

5

PARTS AND SCHEMATICS

5.1 DRAWINGS

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

5-1

5.2 ERRATA

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

5-1

5.3 ORDERING PARTS

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

5-1

APPENDIX

A

SELF CALIBRATION

A.l INTRODUCTION

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

A-1

A.2 CALIBRATION QUERY RESPONSE

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

A-1

APPENDIX

B

SELF TEST

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

B.l INTRODUCTION B-1
B.2 TEST QUERY RESPONSE

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

B-1

APPENDIX C SCPI CONFORMANCE INFORMATION

C.l INTRODUCTION ....................................................................................... C-1

C.2 REFERENCE INFORMATION

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

C-1

C.3 SCPl CONFORMANCE INFORMATION

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

C-2

(2.3.1 Model 1395 SCPl version

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

C-2

C.4 MODEL 1395 SCPl COMMAND SYNTAX

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

C-2

C.4.1 SCPl Confirmed Commands

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

C-2

C.4.2 SCPl Approved Commands

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

C-2

C.4.3 Commands not part of the SCPI Specification

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

C-2

C.4.4 Incomplete Command lnplementation

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

C-2

APPENDIX D SCPl COMMAND TREE

D.l COMMAND TREES

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

D-1

APPENDIX E SAMPLE PROGRAMS

E.l INTRODUCTION

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

E-1

E.l.l Example 1

....................................................................................... E-1

E.1.2 Example 2

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

E-2

E.1.3 Example

3

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

E-3

E.1.4 Example 4

........................................................................................... E-4

E.1.5 Example 5

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

E-5

APPENDIX F MATE INTERFACE SYNTAX

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

F.l INTRODUCTION F-1
F.2 GAL COMMAND

....................................................................................... F-1

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

F.3 ARB GENERATOR DOCUMENTATION F-1

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

F.4

ARB GENERATOR ERROR MESSAGES F-2

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

F.5 MlSC ARB GENERATOR DOCUMENTATION F-4

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Table 2-1

Table 3-1
Table 3-2
Table 3-4
Table

3-5

Table 3-6

Table

4-1

Table C-2

Test Equipment and Tools

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

2-4

Model

1395

Front Panel

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

3-3

Model 1395 Command Summary

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

3-5

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

Error Messages

3-24

IEEE

488.2 Common Commands

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

3-25

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

Input and Output Impedances 3-26

List of Test Equipment

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

4-1

Model 1395 Command Summary

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

C-3

viii

CONTENTS

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ILLUSTRATIONS

Figure 1-1

Figure 2-1
Figure 2-2

Figure 3-1
Figure 3-3
Figure 3-4
Figure

3-5

Figure 3-6
Figure 3-7

Figure 3-8
Figure 3-3
Figure

3-10

Figure 3-1 1

Figure 3-1

2

Figure 3-1 3
Figure 3-14

Figure

D-1
Figure D-2
Figure D-3

Figure D-4

Figure D-5

Figure D-6
Figure D-7
Figure D-8

Figure

F-1
Figure F-2
Figure F-3
Figure F-4
Figure F-5

Model 1395 50 MHz Arbitrary Waveform Synthesizer

......,....

1-0

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

Set the Logical Address

2-2

Bus Arbitration Level Jumpers

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

2-3

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

Model 1395 Front Panel 3-2

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

Output Termination 3-26

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

Model 1395 Basic Operating Setup

3-27

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

Continuous Waveform Characteristics 3-28
Definite Length Arbitrary Block Data Format

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

3-33

VXlbus System Using "External Host" GPlB Controller

.........

3-36

Triggered Waveform Characteristics. Count

=

1

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

3-38

GateIBurst Waveform Characteristics

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

3-40

CONTinuous Sequence State Diagram

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

3-41

TRlGgered Sequence State Diagram

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

3-44

Sweep Mode Characteristics

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

3-47

Intermodule Triggering Backplane Connections

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

3-51

Intermodule Triggering Command References

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

3-52

Subsystems (Root Node)

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

D-1

INITiate. STATUS. TEST. and RESet Subsystems

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

D-2

SOURce Subsystem

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

D-3

TRACe Subsystem

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

D-4

TRlGger Subsystem

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

D-5

OUTPut System

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

D-6

SYSTem Subsystem

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

D-7

CALibrator Subsystem

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

D-8

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

Common Command Format F-4

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

Sine and Triangle Format F-5

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

Square and Ramp Format F-6

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

User Defined Waveform Format F-7
DC Function Format

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

F-8

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-

50

MHz

Arbitrar)

Waveform Synthesiz

model

1395

RUN

0

FAIL

@

CLK

INIOUT

TRIG IN

MAIN OUT

model

1395

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Specificalions

Section

1

1.1

THE

MODEL

1395

The MODEL 1395 is a high performance Synthe­sized Arbitrary Waveform Generator (ARB) with
the following main features:

Up to 50 MHz Sampling Frequency

12 Bit Vertical Resolution
32K points (128K optional) Horizontal Reso-

lution
Intermodule Triggering, Summing and

Phase Control
Waveform Linking and Looping
64K bytes Shared Memory for fast data

transfer
SCPI Compatible Command Language
Single Slot, C-Size VXIbus Module

The waveform synthesizer can be programmed to
produce standard waveforms in the frequency
range of 1

pHz to 25 MHz; or arbitrary waveforms
from 5 points minimum to 32K (128K) maximum
sampled at frequencies from 125 mHz to 50 MHz.
Additionally, a Clock Output is provided from 125
mHz to 100 MHz.

Waveforms can be created by selection of the stan­dard waveforms, drawing waveforms by defining
straight line segments, or downloading of binary
images. The A24 Shared Memory may be used for
significantly faster downloads than by using the
word-serial protocol.

The main waveform output provides up to 15 Vp­p into 50R (30 Vp-p, open circuit). Waveform dc
offset or dc output

is

also provided up to k7.5 V

into 50R (k15 V into open circuit).
The control language adheres to the SCPI (Stan-

dard Commands for Programmable Instruments)

format Version 1992.0, February 1992 (refer to the
SCPI manual for further information). SCPI is an
industry standard language for remote instrument
programming. The Wavetek Model 1395 wave-

form synthesizer is a single-slot "C" size VXIbus
module. Using any manufacturer's VXIbus chas­sis, the Model 1395 can be controlled using the
SCPI language and the appropriate controller.

Multiple

ARBS may be linked and operated togeth­er inside one VXIbus chassis. Series operation is
provided by full support of the VXIbus SUMBUS
protocol. A signal programmed at the output may
be sent to the SUMBUS, or signal present at the
SUMBUS may be summed into the model 1395 out-

put. In parallel operation, model 1395's may be
slaved to a master clock/trigger bus on the VXIbus
backplane to create a multichannel waveform syn­thesizer with phase control between channels.

The model 1395 has extensive self-adjustment util­ities built in. Calibration constants are maintained
in non-volatile memory (contains no battery).

1.2

SPECIFICATIONS

1.2.1

Waveforms

(Functions)

Programmable standard functions include sine, tri­angle, square, positive ramp, negative ramp, posi­tive haversine, negative haversine, random
(noise), sinc (sin x/x) and dc. (The function

"WTST"

is a reserved function name used for fac-

tory maintenance, and it should not be selected as

a

function or used to name an arbitrary wave­form.) One to fifty arbitrary waveforms (traces)
may be stored by name in volatile 32,768 point

(optionally 131,072 point) RAM memory. Each

trace has 12 bits vertical resolution, and from

5

points to the maximum number of points in the
waveform memory horizontal resolution.

1.2.2

ARB

Waveform Craatlon

and

Edltlng

The Arb has a variety of ways to create a wave-

form. Binary data may be down-loaded from a
computer. Internal "standard waveform" algo­rithms will create exactly one cycle of the wave­form requiring nothing more than a name and a
space set aside for it (random, sinc and dc,

obvi-

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ously, are not cyclical). Previously created wave­shapes residing in memory may be copied to a
new trace. Waveforms can be built using line seg­ments.

The Model

1395

Arb has several editing features.
After filling memory with data defining the wave­form, the user may select only a portion to be
"played back" using the

TRACe : LIMi

t

com­mand. The selected portion may be used for cre­ating a new waveshape using the

TRAC

e

:

DATA

command. A trace may also be overwritten with
new data with the

TRACe : DATA

command. Any
waveform may be stretched or shrunk by copying
it into a different size memory space; waveform
points are automatically added or removed to re­tain the integrity of the shape using the

TRACe : DATA

command.

By

copying waveshape
segments end to end, new waveshapes can be cre­ated with the

TRACe : DATA

command. A wave-

form may be resized using the

TRACe : POINt

s

command. A line segment of any size between

5

points and the maximum memory size can be cre­ated using the

TRACe : LINE

command. Any

waveform in the directory can be selected for

"play back" with the

FUNCt

i

on

:

USER

<trace-name> and

FUNC

t

i

on

:

SHAPe USER

commands. Individual waveshapes may be delet­ed by name or the entire memory can be erased

using the

TRAC

e

:

DELe

t

e

command.

1.2.8

Oparatlonal

Modes

CONTinuous:

The selected trace is output continuously at the
selected frequency, amplitude and offset. The
sync marker is output once per waveform (select­able as a pulse at the start of the waveform or as a
zero-crossing output of the waveform) and the

position marker is output at any selected points of
the waveform. Frequency is determined by the

TRACe : MODE (CW

or

RAST~~),

programmed

FREQuency

value

(CW

waveform frequency or

RASTer

sample clock frequency), and

ROSC

i

1

-

lator

:

SOURce (IN~ernal

125 mHz to

10

MHz, VXIbus

CLOCk,

or

EXTernal

clock
source). For details, see paragraph 1.2.6, Fre­quency.

TRIGgered:

Waveform output is quiescent at first data point

of selected trace until a triggering event (select­able by

TRIG^^^:

SOURce

as

INTernal,

EX-

Ternal,

VXIbus

TTLTrg

or VXIbus Local Bus

CHAin),

after which waveform cycle(s)

at

the
programmed frequency, amplitude and offset is
initiated. The waveform completes the number of
cycles set by the

Trigger

Count

and returns to its
quiescent baseline value for another triggering cy­cle. The triggering baseline is the level of the first
waveform address.

For details, see paragraph 1.2.12, Triggering.

GATE:

Same as Triggered except output is continuous for
duration of gate signal. Last waveform cycle is al­ways completed when gate signal is removed.

AMISCM:

Operates as in Continuous Made above, except
that the output can be Amplitude Modulated or
Suppressed Carrier Modulated by external sig­nals. For details, see paragraph 1.2.13, Modula­tion.

SWEep:

Operates as in Continuous Mode above, except
that the output frequency can be swept by an in­ternal sweep generator between programmed
start and stop frequencies.

Sweep capability is provided for standard wave-

.

forms and Arbitrary waveforms with a length that
is a multiple of

4096

points. A horizontal sweep

output voltage is also provided. For details, see

paragraph 1.2.11, Sweep.

Linked Sequence mode provides sophisticated
linking, looping and advancing of multiple wave­form segments. This allows the creation of long
and very complex waveform sequences. For de­tails, see paragraph 1.2.10, Linked Sequence

Op-

eration.

1

.2.4

Input

and

Output

8pedflcatlolu

1.2.4.1

Outputs

The Model 1395 Arb has four output signals on
the front panel: the function output, the position
marker, the sync marker, and the sample clock.
The Arb also provides a clock to the selected
VXIbus backplane ECLTRG line, and a trigger

output to the VXIbus Local Bus or to the selected
VXIbus TTLTRG line. The

ECL

Trigger lines can
be used to share waveform sample clocks. The
TTL Trigger lines can be used for intermodule
triggering.

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MAIN

OUT:

Front panel mounted female BNC, source of pro­grammed function at selected frequency, ampli­tude and offset. Source impedance is

50

Q.

Protected against short circuit to ground.

SYNC MARKER/H-SWEEP OUTPUT:

Front panel mounted female BNC. The SYNC
MARKER is a TTL compatible pulse into

50R

at
the waveform frequency. Sync generation tech­nique is selectable as

"ZCRO

s s"

or as

"BBI

TS

".

If

ZCROSS

is selected, the sync is generated from
zero-cross detecting the waveform. The sync
marker is a TTL high whenever the waveform is
positive. This is the preferred selection when

TRACe : MODE

is set to

cw

(phase accumulation).

This is because in

CW

a particular point may not

be used in every scan through the trace.
When

BBITS

is selected, the SYNC MARKER is a
TTL high for a variable number of samples (see
POSITION MARKER description for explanation)
starting at the first waveform memory location
used. When

TRACe :MODE

is

RASTer,

either
sync technique is applicable. Protected against
short circuit to ground.

Levels:

Low level < 0.4V

into > 508

High level > 2.OV

into > 508

Rise and Fall time:

<

5

ns into

50R

Configuration as a H-Sweep (Horizontal Sweep)

is made when the Frequency Mode is set to Sweep
or to List. A linear output ramp from

0

to

+10

volts

(f500

mV, open circuit) proportional to
sweep position between selected start and stop
limits is provided to drive the horizontal axis of a
display device. The output impedance is

600 R

f

5%.

POSITION MARKER OUTPUT:

Front panel mounted female BNC. TTL compati­ble pulse into

50 51.

User can clear the markers
low at all points or set the marker high at any
point in a trace. Protected against short circuit to
ground.

A marker set at address zero will be true during
the trigger quiescent baseline. If address

1

is set
(and zero is not), the POSITION MARKER output
follows the trigger event plus the pipeline delay.

The Position Marker is one trace point (not neces­sarily

1

clock) wide for each location selected. In
Raster mode, the trace point corresponds to a
clock cycle. In CW mode, for high frequency
waveforms, a trace point may not be accessed in

each pass through the waveform. For very low
frequencies, and in CW mode, each trace point
may be sampled for a number of clock cycles.

Levels:

Low level < 0.4V

into > 5052

High level > 2.OV

into > 50R

Rise and Fall time:

<8

ns into

50R

CLOCK INIOUT:

Front panel mounted BNC, selectable as either
TTL level clock input or TTL level clock output.
TTL Clock output is

0.1251

Hz to

50

MHz wave-

form sample clock in normal operation and

0.1251

Hz to

100

MHz in Clock mode. The output is pro-

tected against short circuits to ground.

Configured as an output:

Range:

0.1251

Hz to

100

MHz

Resolution/Accuracy:

Same as the frequency synthesizer.

Levels:

Low level < 0.5V

into

5062

High level > 2.1V

into

50R

Rise and Fall time:

<3

ns into

50R

TRIGGER OUTPUT (to

VXI

Backplane):

One of the eight VXIbus TTLTrigger lines can be

programmed as trigger output. The source of the

output trigger signal can be selected as "BIT",

"Loop COMplete", or "Burst COMplete". The

BIT

signal is set to be output during a specified
Trace or segment within a SEQuence, either at the
end (Trigger Marker) of the Trace or at selected
point(s) within the Trace (Position Marker).

LC OMP

1

e

t

e

indicates that a SEQuence segment

has completed its loop count.

BCOMp

1

e

t

e

indi­cates a Trace or a SEQuence has completed its
burst count.

When these sources are selected, the minimum

pulse width is

30

ns and maximum frequency

that can be applied to a VXIbus TTLTrigger line is

12.5

MHz (per VXIbus specification). Exceeding
these limits should be avoided by setting wave­form sample frequency below

33

MHz or by pro-

gramming

2

consecutive BITS when using the TTL

Trigger lines for a trigger output.

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CLOCK OUTPUT

(to

VXI

Backplane):

Either of the ECL Trigger lines can be pro-

grammed

as

a

clock output for intermodule tim­ing. The "master" module supplies its internal
clock to this output to be used by "slave" mod­ules as a clock reference for Phase Lock or for
tightly controlled trigger timing. When in
TRACe: MODE

CW

and internal clock is selected,

the internal clock is a fixed 50

MHz.

In
TRACe:MODE RASTer the internal clock's mantis­sa can range from 25 MHz to 50 MHz with 5 dig­its or 0.1

mHz of resolution under user control.

To set Phase Lock ON, the module selected as the
"master" drives the selected ECL Trigger line
(ECLTrg<n> ON) with its frequency synthesizer
clock signal. All modules, including the "mas­ter", get their Reference Oscillator (clock) from
the

ECLTrg line (R0SC:SOUR ECLT<n>) for opti­mum timing accuracy. When ECLTrg<n> is select­ed as an output by the "master":

Clock Frequency Range:

25 MHz to 50 MHz (Raster);

50 MHz

(CW).

Resolution/Accuracy:

Same as frequency synthesizer.

SUMBUS OUTPUT

(to

VXI Backplane):

Analog signals at the 1395's MAIN OUT may also
be summed into the VXIbus SUMBUS line with a

fixed scale factor (see Intermodule Analog Sum­ming, paragraph 1.2.14). A full amplitude 15 Vpp
signal at the MAIN OUT results in a

75

mApp sig­nal driving the 25R SUMBUS line. SUMBUS driv­er specifications are:

Scale Factor:

Accuracy:
Load Impedance:

Output Impedance:
Compliance:

Bandwidth:

5 mAN (5 mApp signal at the SUMBUS
line for each Vpp MAIN OUT).

*

(6%

+

2.5mA)

25Q

+_

2% (VXlbus specification)

>

10 kR in parallel with < 20 pF

f

1.2 V minimum

>

50

MHz

(limited by the backplane)

1.2.4.2

Inputs

The Model 1395 has two TTL signal inputs on the

front panel, clock and trigger. The external clock
frequency may range from dc to 50 MHz, the ex­ternal trigger may range from dc to 5 MHz. Addi­tionally, clock inputs can be accessed from the
selected VXIbus ECL Trigger line, and trigger in-

puts can be accessed through VXIbus Local Bus
or the selected TTL Trigger line. The clock and
trigger input lines from the backplane are limited

by the VXIbus specifications to a maximum of

62.5 MHz for clock and 12.5 MHz for trigger. See
VXIbus System Specification for usage.

TRIG IN:

Front panel mounted female BNC, accepts exter­nal TTL triggering signal. Input impedance is >1
kR. Protected to

f

15 Vdc.

Trigger Slope:

Positive or Negative selectable

Amplitude Range:

TTL levels, VinHmin = 2.1 V, VinLmax

=

0.8V

Min pulse width:

20 ns

Frequency:

dc to 5 MHz

AM IN:

Front panel mounted female BNC. Signal present
at this input amplitude modulates the Main Out­put signal. AM (amplitude modulation) and SCM
(suppressed carrier modulation) are supported.
Protected to k 20 Vdc. For details, see paragraph

1.2.13, Modulation.

Frequency Range:

dc to 500 kHz

Amplitude Range:

~t

15 V maximum

Input Impedance:

10 kR

CLOCK INIOUT:

Front panel mounted female BNC, selectable as
either TTL level clock input or TTL level clock
output. Clock input used as waveform sample
clock. Input impedance is

1

kR. Protected to k20

Vdc.

Configured

as an input:

Frequency:

dc to 50 MHz

Amplitude Range:

TTL levels, VinHrnin = 2.0 V, VinLmax

=

0.4V

Min Pulse Width:

10

ns

TRIGGER INPUT

(from

VXlbus Backplane):

One of the eight VXIbus TTL Trigger lines (TTL­TrgO-7) can be programmed as trigger input from
the VXIbus to the model 1395. The TTL Trigger

line has a VXI specification limit of 12.5 MHz
maximum and 30 ns minimum pulse width. Ad­ditionally, the 1395 module has a practical limit of

5

MHz maximum for a trigger input signal.

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If

another

1395

module is driving the TTL Trigger

line, the above limits must not be exceeded. See

"Trigger

Output (to

VXI

Backplane)"

in para-

graph 1.2.4.1.
See paragraph 1.2.12, Triggering, for examples of

VXIbus Backplane triggering.

CLOCK

INPUT (from VXI Backplane):

The ECL Trigger lines can be programmed as a
clock input from the VXIbus to the model 1395.
The "master" module supplies its internal clock to

this output to be used by "slave" channels as a
clock source for waveform generation. This al­lows tightly coupled intermodule operation in
Phase Lock or triggered modes.

The "slave" module(s) will receive the clock sig­nal on the selected

ECLTrigger line when the Ref-

erence Oscillator

Source(R0SC:SOUR) is ECLTrgO

or ECLTrgl:

Clock Frequency Range:

25 MHz

to

50 MHz

(Raster);

50 MHz

(CW).

Note

For Standard functions, Trace Mode is

CW,
and the waveform sample frequency (and thus
the Clock output from the Master) is

50

MHz

fixed. For the USER function, Trace Mode

is

Raster, sample frequency is selectable, and the
Master's clock output will vary between

25

MHz and

50

MHz with the mantissa of the

1SOURce:I FREQuency:RASTer parameter.

SUMBUS INPUT (from VXI Backplane):

Analog inputs on the VXIbus SUMBUS line may
be summed into a model 1395 MAIN OUT with a
selection of scale factors (see Intermodule Analog
Summing, paragraph 1.2.14). With no

SUMBUS
attenuation selected, a 1.875 Vpp (75 mA driving
25R) signal on the

SUMBUS line will drive the

MAIN out to its full-scale amplitude of

15

Vpp.

SUMBUS receiver specifications are:

Scale Factor (1:1 atten):

8 VIV (8 Vpp out at

MAIN OUT

for each

Vpp input at the

SUMBUS).

Accuracy:

+(6% t 200rnV t 2.5rnA)

Input Impedance:

>

10

kR

in parallel with < 20

pF

Bandwidth:

>

50 MHz

Local Bus lnputslOutputs (VXlbus Backplane)

The VXIbus Local Bus is used for triggering and
phase locking.

LBUSAOO, LBUSBOO

These pins are internally connected to as the
Phase Reset Bus. The Phase Reset signal is moni­tored by all phase locked modules. When this
signal is asserted all modules are reset and held at
the start address of the active trace. This signal
can be driven by any phase locked module. If is

driven whenever phase lock is enabled and a pro­gramming change is made.

LBUSAOP

This pin is used to receive the Chain Trigger sig­nal from the module to the left. The Chain Trig­ger signal is one of the trigger sources.

LBUSB02

This pin is used to drive the Chain Trigger signal
to the module to the right. The Chain Trigger sig­nal is always enabled and its source is the same as
that for the TTL Trigger Lines.

LBUSAO3, LBUSBO3

These pins are internally connected to form the

End Trigger Bus. The End Trigger Bus is used to
carry the End Trigger signal from the right-most
module back to the left-most module. Any mod­ule may be programmed to drive the End Trigger
signal. The End Trigger signal is one of the trig­ger sources.

1.2.5

Waveform Characterlstlcs

Square Transition Time:

For slOVp-p:

~9.0

ns

For > 10 Vp-p:

~9.5

ns

Square Aberrations:

~(5% t 20

mV)

Square Symmetry:

(0

"C

to

+50

"C)

r

10 MHz:

50%*2%

Sine Distortion: (Maximum Harmonic level, Elliptic filter
selected)

<I00 kHz, s 10 Vp-p:

-60

dBc

c100 kHz, I 15 Vp-p:

-55

dBc

<5

MHz, >10Vp-p:

-40

dBc

d0 MHz,

51

OVp-p:

-35

dBc

40 MHz,

>1

OVp-p:

-28 dBc

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Intermodulation Products: (Maximum Spur level, Elliptic

filter selected)

<5 MHz:

-

60 dBc

<I0 MHz:

-

50 dBc

120 MHz:

-

35 dBc

1.2.6

Frequency

Range:

Sine - 1pHz to 20 MHz.
Square

-

1pHz to 25 MHz

Haversines

-

1pHz to 20 MHz.

Other Standard Waveforms

-

lpHz to

2 MHz.

Resolution

-8 digits limited by 1 pHz, 5 digits when >20 MHz; 5
digits when in Triggered or Gated modes, or when the selected
function is

USER

vs. a Standard function.

Frequency Accuracy-

Determined by the selected clock source. When
internal source, frequency reference is provided by the VXlbus
ICLKIOI. Frequency accuracy is equal to the selected source
accuracy specification t200 nHz.

1.2.6.1

Arb Clock and Waveform Timing:

CW (Phase Accumulate) Mode:

The waveform is generated by a phase accumula­tor. "Standard" waveforms occupy a fixed 4k
block of points and are output in CW playback
mode. When standard waveforms are selected in
a triggered or gated mode of operation, the clock
frequency resolution is reduced from eight to five
digits.

Raster Mode:

User defined (arbitrary) waveforms are generated
by scanning through each point in the trace, one
clock cycle per point. User waveforms can have
horizontal resolution ranging from

5

points to

32K

(128K

optional) points. The internal raster

clock frequency is programmable from

125

mHz

to

50

MHz with 5 digits resolution, limited by

0.1

mHz. Waveform frequency is calculated by divid-

ing the clock frequency by the number of points
in the trace.

12.7

Arplltude

Range:

0.015 to 15Vp-p into 50R

0.03 to 30Vp-p into

>

10

kR

Resolution:

3.5 digits

Monotonicity:

0.2

90

Sinewave Flatness: ( relative to 1 kHz amplitude, Elliptic
filter selected, non-sweep modes)

c

5 MHz,

T,,, f 10°C

:

*2

96

<

5 MHz, 0 to 50°C:

*5

4b

<

20 MHz,

T,,,

_+

10°C:

+_

5

Oh

c

20 MHz, 0 to 50°C:

+lo

%

Accuracy: The greater of

+1%

of setting or the following

Limit:

Ampl(Vp)

+

ABS(0ffset)

>

2.500 & 17.500 V

>

1.250 & 12.500 V

>

0.625

&

1

1.250 V

>

312.5 & 1625 mV

>

156.3

&

5

312.5 mV

>

78.13

&

1

156.3 mV

>

39.06 & 178.13 mV

1

39.06 mV

1.2.8

Otlset

Range:

Resolution:
Accuracy:

Limit

*

7.5Vdc into 50R

k

l5Vdc into 210 kR

3.5 digits
The same as for Amplitude Accuracy.

1.2.9

FlIterlne

(user selectable):

20

MHZ-4 pole Bessel

20

MHz 7 pole, 6 zero Elliptic

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1.2.1 0 Unked

SEQuence

Opemvtlon

Number of Waveform Segments:

2

to

4

Segment Loop Count
Start Conditions:

Advance Conditions:

Advance Trigger Types.

Advance Types:

Sequence Modes.

1 to

65,535

or continuous.

Requires a trigger to Start a SEQuence.
Uses the Word Serial command or any
selected start trigger event.

Segment Loop Count complete;

Loop continuously until selected
advance trigger event true;

Loop done and advance trigger true

Event -Trigger must transition to the
true state to qualify as an event Tr~gger
event is latched

Level

-

Trigger must be in the true state
to initiate an advance. Trigger is not
latched

Synchronous

-

Current segment is

completed before next segment starts
Asynchronous

-

When advance

conditions

are met, next segrnent is

slarted Immediately Current segment

1s

not completed.

Continuous

or Triggered; Trigger Count

selectable (1 to 524,287).

Notes

Ifadvance condition from last segment to first
segment is "advance trigger true" or "Loop
done and advance trigger true", the sequence
must be run in continuous mode.

The trace limits of each trace taken from each

block in the sequence are determined by the

trace selected by the

TRACe:SELect command

previous to selecting the

SEQuence Mode.

1.2.11

Sweep

Sweep Time:

30 ms to 1000 s (15 frequency points at
30 ms) with (11512) s resolution and an
accuracy of 0.1% +(1/512) s.

Sweep Modes:

Continuous up

or

down

-

Output frequency sweeps from start
frequency to stop frequency, or stop to start if direction is
down, with selected characteristic (linear or log).

Continuous up/down

-

Output frequency sweeps from start frequency
to stop frequency, then back to start frequency with selected
characteristic.

Triggered

up

or down

-

Same as Continuous except output holds at

start frequency (or stop

if

down selected) until receipt of
trigger. Programmed number of sweeps, set by Sweep Count,
are completed for each trigger signal.

Triggered up/down

-

Same as Continuous upldown except output

holds at start frequency until receipt

of

trigger. Programmed

number of sweeps are completed for each trigger signal.

Triggered Sweep & Hold

-

Same as Triggered up or down except

frequency is held at end of each sweep. An additional trigger

is required to return to beginning of sweep.

Triggered Sweep & Hold with Reverse

-

Same as Triggered upldown

except frequency

IS

held at stop frequency. An additional

trigger is required to initiate a sweep back to start frequency.

Sweep Spacing.

Linear or Log

Sweep Count:

1

to 1,000,000

Minimum sweep trfgger pulse width:

>

500

p

1.2.1

2

Wiggering

Trigger Sources:

BUS Trlgger ('TRG or GET; TR1Gger:IMMEOiate)
VXlbus Word Serlal Tr~gger Command
Trlgger Input Connector(s)
Internal Trigger Generator(s)
VXI TTL Trigger line driven by another module
Chained Trigger, receive trigger signal on the VXlbus Local Bus driven

from adjacent module.

Linked Sequence Advance Condition:

derived from:

Trigger Count Complete

Loop Complete from any or all segments

of a linked sequence.

Waveform Complete from an arbitrary
waveform or any or all segments of a
linked sequence.

Trigger Destinations:

Start Trigger:

Initiates gated or trigger modes and
starts sequences.

Advance Trigger:

Conditions advances between segments
of

a

linked sequence.

Internal Trigger Generator(s):

Period:

200 ns to 1000 s

Resolution:

200 ns

Accuracy:

Same as VXlbus ICLKI 01

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Trigger Delays and Jitter: (Specified for Trigger lnput
connectors with

TTL

input signal)

Delay:

With Standard Functions:

<250

ns

With User Waveforms:

~400

ns

Jitter: With Standard Functions:

<20

ns

With User Waveforms:

<40

ns

Note

Trigger delays and jitter specified with inter­nal sample clock only.

If

external clock is

used:

Delay:
Jitter:

Trigger Count:

7

clock periods

+

400

ns

+

1

clock period

For waveforms:

1

to

1,048,575

For sequences:

1

to

524,287

Note

Triggered modes

of

operation are limited to

10

MHz waveform frequency with 5 digits of

frequency resolution.

1.2.1

8

Modulation

Types:

AM

(Double sideband

with

carrier)
SCM (Double sideband suppressed carrier)
B3nd width:

>

500

kHz

Carrier Suppression (SCM):

>

-40

dB

Modulation Distortion:

Modulation Freq

I

100

kHz:No

harmonic

>

-50

d8c

Modulation Freq

I

I

MHz: No harmonic

>

-30

dBc

SCM Scale Factor:

5

VN

AM

Scale Factor: Proportional to programmed amplitude, as

follows:

Scale Factor Accuracy:

Carrier

2

5

MHz:

t5

%;

Carrier

>

5

MHz:

+20

Oh

Ampl(Vp) + ABS(0ffset)

>

2.500

&

5

7.500 V

>1.250& 12.500V

>

0.625 & 11.250

V

>

312.5 & 1625

mV

>

156.3

&

2

312.5

mV

>

78.13

&

5

156.3

mV

>

39.06

&

5

78.13

mV

5

39.06

mV

Note

Ratio of Vout to

Vin

re-

quired for

I00

%

AM

1O:l

5:l

2.5:l

1.25:l

0.625:l

0.3125:l

0.1563:l

0.07813:l

All scale factors assume Main Output termi-

nated into

500

load.

Intermodule Analog Summing:

The waveform from the

1395

module can be driv-

en onto the VXIbus Backplane SUMBUS. The

1395

can also receive the VXI backplane SUMBUS
signal, and sum it with the MAIN OUT output
signal. To extend the dynamic range of the SUM­BUS signal, the

1395

provides eight input attenua-

tors selectable from the following:

Attenuation,

dB:

I

Division, ratio:

-42

I

111

28

Note

For SUMBUS Driver/Receiver specifications (Scale Factor,
bandwidth, etc.) refer to paragraph

1.2.4.1,

SUMBUS

Output (driver) and Paragraph

1.2.4.2,

SUMBUS lnput

(receiver).

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Intermodule Phase Control

Two

adjacent modules can be assigned a fixed
phase relationship. The "Slave" module must be
driven by the "Master's" clock generator and the
waveforms must

be

of the same length and fre­quency. Any change in phase angle between
channels will require one waveform

cycle

to re-ac­quire phase lock. Phase control signals use the
VXIbus Local Bus.

Note

Phase lock operates with adjacent model

1395's

using the VXlhus Local

Bus.

Frequency Range.

1

pHz

to

SO

MHz

Phase

Resolution

360°14096 points, standard

functior;~,

360°/polnts, User def~ne~i

~aveforms

Phase

Accuracy

+

(tfl x 360")

where

t

=

1

cloc~

perwd

t

10

ns

and

T

--

waveform

oeriod

Intermodule

Triggering

Adjacent modules can also use the

VXI

Lo;

<i!

Bus

to "daisy chain" a trlgger signal from the "<tartf'
module, through a number of adjacent

rr:~~ci:iles

~r,

the "Chain"

to

the "End" module. Each

module

receives the triggering signal on the Local Bus
CHAin line from the module to its left, and dr~ves
the CHAin line with its selected Trigger Source

to

the module on its right. The "End" module can
be set up to drive a selected TTL Trigger line with

its selected Trigger Source back to the "Start"

module, ciosing the loop.

In this fashion, complex and versatile intermod­ule triggering schemes may be set up. Each mod­ule can have its Trigger Source (the signal that it
uses to drive the CHAin line) and its output

waveform set up independently. Trigger Sources

include BIT (pulse occurring at the end of or in a
selected position within a trace), Burst

COMplete,

or Loop COMplete.

1.2.1

5

Frequency

List

Fast frequency changes are possible using

[Source:] Frequency:Mode List. In this mode of
operation the output frequency is determined by
the contents of the Frequency List. The Frequency
List is a user programmable list of up to

1024

fre-

quency values.

A

trigger event causes a transition to the next fre­quency in the list. When the last frequency in the
list

is

reached the next trigger returns

to

the

first

frequency in the list. The effective size of the list
is programmable from

1

to 1024 using the

[Source:)List:Points command.

The maximum effective trigger rate in this mode

is approximately

2

kHz.

1.2.1

6

Option

Expanded Waveform

RAM

Quadruples waveform data storage volatile RAM
from

32

I(

to

128

K

points.

1.2.1

7

AutoCallDlagnostics

Each

1395

AKB Module contains time and

DC
voltage measurement capability. This feature pro­vides the ability to conduct a limited AutoCal and

self

didgnostic.

Some

parts of the calibration

(e.g., amplifier flatness) require the use of exter­nal measurement equipment. The calibration data
is stored in

EEPROhl.

The

Processor accesses the

data and uses

it

to

correct the output as required

to maintain the specified performance.

Performancr specifications apply within the
specified environmental conditions after a

20

minute warm up prriod. Specifications are
subject to change without notice.

The

"T,,,"

nomenclature used in this specifi­cation refers to the ambient temperature at
which the last full Calibration was performed.
This temperature

musf be within the range of

10

to

40

"C.

1.3

GENERAL

1.8.1

8CPI

Programming

The Model

1395

Arb adheres to the Standard
Commands for Programmable Instruments (SCPI)
remote programming format Version 1992.0, Feb­ruary 1992 (refer to the SCPI manual for further
information). SCPI is an industry standard lan­guage for remote instrument programming. It ad­dresses a variety of test and measurement
instrument requirements.

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The Wavetek Model

1395

Arbitrary Waveform

Generator is a single slot,

C

size VXIbus module.
Using any manufacturer's VXIbus chassis, the
Model

1395

Arb can be controlled using the SCPI
language and the appropriate controller. Root
level commands include:

MODE

OUTPut SOURce

STATUS

SY

STem TRlGger

CALibration lNlTiate RESet

TEST TRACe

The model 1395 supports all Word Serial Com­mands specified in the VXIbus System Specifica­tion (Rev. 1.3) Tables E.l and E.2 for the above
subset/protocol classification. It also supports all
IEEE-488.2 Common Commands mandated for
use with SCPI.

1.8.2

VXl

Interface

The internal frequency synthesizer and internal

trigger timer utilize the CLKlO signal.

TTLTrigger Lines

Trigger signals can be sourced and received on

any one of the eight TT'L Trigger Lines.

ECL

Trigger

Lines

Thc ECL Trigger L1ne5 can be used to share

the

output of one module's mternal frequency synthe-

sizes

~imong mult~ple module5 This allows

muti-

ules

to

share a clock

wlth

the same phase

I'h~s

1s

~mportant in order

to

phase link multiple mod-

ules

Local Bus

The Local Bus is us&

ti:

transfer high speed trig­ger and synchronizat~on signals between sdjdcent
modules in a VXIbus chassis.

ECL

level signals

appear on LBUSAOO, LBUSCOO, LBUS A01 and

LBUSCOI. TTL level signals appear on LBUSAOZ,
LBUSC02, LBUS A03 and LBUSC03. These signals
are always enabled.

The CHAIN trigger signal is driven onto
LBUSCO2 and received from LBUSA02. This sig­nal is used to trigger adjacent modules. Multiple
adjacent modules can propagate the CHAIN trig­ger down the chain.

The

END

CHAIN trigger is bussed between
LBUSA03 and LBUSC03. Any module can be pro­grammed to drive or receive this signal. Typically
the last module in the chain is programmed to

drive the

END

CHAIN

trigger signal while the
first module in the chain is programmed to re­ceive it. This allows the loop to be closed

in

the

chain.

Shared Memory

64k bytes of A24/D16 Shared Memory are avail­able to be used for the high speed transfer of trace
data. Data transfer rates using Shared Memory
are much higher than what is possible using Word
Serial Data Transfer Protocol.

VXlbus Interface Card

The VXIbus Interface Card contains a Message Based
Device interface (MBD) which supports the following
subsets/protocols:

A16/A24 Dl6 Slave
A16/A24 Dl6 Master
VXIbus Instrument Protocol (I)
VXIbus IEEE-488.2 Instrument Protocol

(14)
Event Generator

Response Generator

211

Ward Srrml Commands specified in the

VXlbus

System Specificat~on

(Rev

1.7)

Tables

F

1

317d

E

2

tor

the abnve qubiet/protc!ci~l clas51flca

tlon are supported

Processor & Memory

*

64

kB

of

local

Static RAM

*

128

k13

of EPROM

*

Renl Time Clock generates system tick and
adds time and event capability to applica­tion code.

VXlbus Interface

VXIbus P1 and P2 connector
A16/A24 Dl6 Bus Master capability
64 kB A24 Dl6 Shared Memory
Implements the complete Message Based

Device interface.

Full A16/A24 register access qualification.
Drivers and Transceivers meet the high

VMEbus output drive requirements.
All optional A16 Registers provided.

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Application Interface

Access to all CPU address, data and con­trol lines

VXIbus TTL Trigger and Local Bus head­ers.

VXIbus

ECL

Trigger

and 10

MHz

clock

buffers.
SYSCLOCK, RESET" and

ACFAIL

lines

Power supplies +5, -5.2, -2,

+12,

+24

1.8.8 Environmental

Temperature Range:

Operating:
Storage:
Warm-up Time:

Altitude:

Operating:
Storage:

Temperature of last Self Calibration

ilO°C

for specified operation.

0°C

to

50°C.

-40°C

to

+71°C

(RH

not controlled).

30

minutes for specified operation,

except stability specifications require

60

minutes.

Sea level to

10,000

ft.

Sea level to

15,000

ft.

Relative Humidity (non-condensing):

0°C

to

+lO°C:

not controlled.

+I1

"C

to

+30°C:

95

k

5%

RH

max.

+3I0C

to

+40°C:

75

i

5%

RH

max.

+41°C

to

+50°C:

45

*

5%

RH

max.

Vibration:

Operates at a vibration level of

0.013

in.

from

5

to

55

Hz

(29

at

55

Hz).

1.8.6

Power

Total:

Voltage

+24

Vdc

t5

Vdc

-2

Vdc

-5.2

Vdc

-24

Vdc

+12

Vdc

-12

Vdc

1.8.8

Reliability

<

35Watts

Peak

Current

250

mA

2000

rnA

250

rnA

2200

mA

250

mA

200

mA

350

mA

Dynamic

Current

200

mA

100

mA

20

mA

100

mA

200

rnA

50

mA

50

mA

22,000 hours MTBF at 25"C, ground benign.
MIL-HDBK-217 calculation at 50% component

stress.

1.8.7 Cooling

Requirement

Within a VXIbus mainframe with cooling air. Min-

imum airflow requirement for 10°C rise is 0.20
mm (0.0075 in)

H,O

at 8.57 l/sec (18.15

CFM).

1.8.8 Safety

Designed to MIL-T-28800D, UL-1244, and the
VXIbus System Specification, Revision 1.3.

1.8.8

EMC

MIL-STD-461C, Part 7, RE-02, and VXIbus System
Specification, Revision 1.3; RE, RS,

CE,

CS.

Shock:

Non-operating,

409, 9

ms half-sine

Bench Handling:

Non-operating. 4 in. or point of balance

drop, any face, solid wooden surface.

1.8.4 Size

Dimensions:

Single slot,

"C"

size

VXI

module.

(31

x

262 x 350

mm).

Weight:

t1.6

kg

(3.4

Ib).

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Section

2

2.1

RECEIVING INSPECTION

Check the shipment at the time of delivery and in­spect each box for damage. Describe any box
damage and list any shortages on the delivery in­voice.

2.1

.l

Unpacking

Instructlam

Unpack the boxes . Unpack the boxes in a
clean and dry environment. Save all the pack­ing material in case the instrument must be re­turned for repair.

Inspect the shipment for damage.

Inspect
the equipment carefully for any signs of me­chanical damage regardless of the condition of
the shipping boxes.

If necessary, file a claim. In the case of me­chanical damage, call the shipper immediately

and start the claim process.
Call Wavetek. Call Wavetek's Customer Ser-

vice representative (619 279-2200) to inform
them that the shipment arrived damaged.
Please be prepared to provide a detailed dam­age report.

2.1.2

Returning

Equipment

Please follow these steps when you return equip­ment to Wavetek:

1.

Save the packing material. Always return
equipment in its original packing material and

boxes. If you use inadequate material, you'll

have to pay to repair any shipping damage as
carriers won't pay claims on incorrectly
packed equipment.

2.

Call Wavetek Customer Service and ask for

a

return authorization. The Wavetek Customer
Service representative (619 279-2200) will ask

for your name, telephone number, company

name, equipment type, model number, serial

number, and a description of the problem.

If at all possible, always use the original shipping
container. However, when using packing materi­als other than the original, use the following
guidelines:

1.

Wrap the Model 1395 in ESD sensitive packing
material.

2.

Use a double-walled cardboard shipping con­tainer.

Protect all sides, including the top and bottom,
with shock absorbing material (minimum of

2
inch thick material) to prevent movement of the
Model 1395 within the container. Seal the ship­ping container with approved sealing tape. Mark

"FRAGILE" on all sides, top, and bottom of the

shipping container.

The Model 1395 should be stored in a clean, dry
environment. In high humidity environments,
protect the Model 1395 from temperature varia­tions that could cause internal condensation. The

following environmental conditions apply to both
shipping and storage;

Temperature:

-40°C

to

+71

OC

Relative Humidity:

not controlled,

non-condensing

Altitude:

<40000

ft.

(121

92

m)

Vibration:

<

29

Shock:

<

409

2.3

PREPARATION FOR USE

Paragraph 2.3 covers the following topics:

Logical Address Selection
Data Transfer Bus Arbitration
Installation

3.

Pack and ship the equipment.

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The VXIbus chassis Resource Manager identifies
units in the system by the unit's logical address.
The VXIbus logical address can range from

0

to

255. However, addresses

0

and 255 are reserved

for special functions. Address

0

identifies the Re­source Manager. Address 255 permits the Re­source Manager to dynamically address the unit
based on the units VXIbus chassis slot.

To change the Model 1395's logical address, use

the eight position

DIP

switch (figure 2-1) ac-

cessible from the side panel. The Model

1395

uses

binary values

(2O

to

Z7)

to set the address using the
active low address switch. This means the OFF
position represents a logical

1.

Conversely, an

ON position represents a logical

0.

Switch posi-

tion number one is the least significant bit of the

address. Insert

A

in figure 2-1 illustrates a switch

set to

a

logical address of 3.

Wavetek ships the Model 1395 with a logical ad­dress of

255

for Dynamic Configuration. Refer to

insert B in figure

2-1.

2.8.2

Data

Trarurler

Bw

Arbltraion

The Model 1395 has VMEbus Mastership capabili­ty. This means the Sweep/Function Generator,
when enabled, sends Responses and Events as
signals to its Commander. The Model 1395 cannot

drive the interrupt lines.

The Model 1395 is configured as

a

level 3 re-

questor

by

the factory. The level 3 Bus Request

and Bus Grant lines are used (BR3*, BG3IN*, and

BG30UT*).

The other Bus Grant lines are daisy­chained by jumpers. The VMEbus specifications
describe three priority schemes: Prioritized,
Round-robin, and Single level. The Prioritized ar­bitration assigns the bus according to a fixed pri­ority scheme where each of four bus lines has a

Figure

2-1.

Set the

Logical

Address

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4

PAN

HEAD

CONNECTORS

INTERBOARD
CONNECTORS

BUSREQUEST

ARBITRATION LEVEL

JUMPER BLOCK

Figure

2-2.

Bus Arbitration Level Jumpers

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priority from highest (BR3") to lowest (BRO*).

Round-robin arbitration assigns the bus on a ro­tating basis. Single level arbitration only accepts
requests on BR3*.

If a different requestor level is required, the jump-

ers must be changed. The following instructions

and figure 2-2 will aid in reconfiguring the Model

1395 to a new level. Refer to the

VMEbus specifi-

cation for more information on

'data transfer

bus

arbitration'.

CAUTION

The SweepIFunction Generator con­tains

CMOS

devices which are sen-

sitive to static electricity.

When

performing the bus arbitration level
change, static electricity discharge
straps should be worn.

Remove the four flat head screws on the Mod­el 1395 left side panel, remove the panel.

Remove the four pan head screws holding the
VXIbus Interface card to the main Sweep!
Function Generator board.

Slowly and gently lift the VXIbus Interface
card up from the Function Generator board.
Considerable force may be required as there
are four connectors between the two boards
with a total of 136 pins. Do not use a metallic
prying tool.

Change the data transfer bus arbitration
jumpers to the desired level. Refer to figure 2-

2.
Carefully install the VXIbus Interface card

onto the Sweep/Function Generator board.
Install the four pan head screws, the side pan­el and the four flat head screws.

2.4

INSTALLATION

The instrument will be installed in a VXIbus

mainframe in any slot except slot 0 (zero). When
inserting the instrument into the mainframe, it
should be gently rocked back and forth to seat the

connectors into the backplane receptacles. The

ejectors will be at right angles to the front panel
when the instrument is properly seated into the
backplane. The two captive screws above and be-

low the ejectors are used to secure the instrument
into the chassis.

This procedure provides the operator, service

technician, receiving inspector, etc. with a quick
method of verifying the functional operation of
the Model 1395. This procedure does not test the
unit's specifications. This procedure assumes the
Model 1395 is properly installed in

a

"C"

size
VXIbus chassis with a VXIbus controller in slot 0.
Required tools and test equipment are given in table
2-1.

Table

2-1.

Test Equipment

and

Tools

Equipment

Oscilloscope
Signal Source

BNC 50R Feed­through (2 ea.)

BNC Coax

Cable (2 ea.)

1

Comments

Bandwidth: 100

MHz

Frequency: 1 kHz to 5 MHz

Output: TTL

Accuracy: 0.5%

Power: 2W
RG58U, 3 ft. length

Because each step in the procedure is dependent
on the preceding step, start with step 1 and con­tinue through to the end. Do not send any com­mand unless specifically instructed to do so
within the procedure.

1) Verify proper LED operation during instru­ment power-up

2)

Send:

*tst?

If response = 0, continue
If response

+

0, decode error value

(see Appendix

B).

Note

If the test fails on a new or newly factory re-

paired unit, call Wavetek Customer Service at

619/279-2200

or

FAX

619/565-9558.

LED

Run
Fail
MODID

A16

A24

Normal Result

On

On, then Off after a second
Flashes very briefly
Flashes
Off

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Connect a coax cable between the MAIN

OUT

connector and oscilloscope through a

50R

ter-

minator.

Send:

outp on

Verify lVp, 1 kHz

sine wave at the MAIN

OUT

connector.

Move cable from the MAIN

OUT

connector to

the MARKER SYNC connector.

Send:

mark:sync on

Verify

TTL

level,

1

kHz

square wave from the

MARKER SYNC connector.

Send:

mark: sync: sour bbit

Verify sets of TTL level pulses at 1 ms inter­vals.

Move cable from the MARKER SYNC connec­tor to the MAIN OUT connector.

Send:

trac:def temp, 50;data

temp,tri;:func:shap user

Verify lVp,

1

MHz

triangle wave.

Move cable from the ARB OUT connector to
the MARKER POSITION connector.

Send:

mark:pos :poin temp, 1 ;poin

temp,3;poin temp,5

Verify three TTL level pulses, each with a

width of

20

ns separated by an interval of

20

Send:

mark:pos :aoff temp

Verify pulses disappear.

Move cable from the MARKER POSITION

connector to the ARB

OUT

connector.

Connect an external

100

kHz,

TTL

level signal

to the

TRIG

IN connector through a

5052

ter-

minator.

Send:

init:cont off; : trig:sour

ext;:trac:data temp,sin

Verify a lVp, 1 ps wide sine wave at 10 ps in­tervals.

10) Change the 100

kHz

external TTL signal to

5

MHz.

Move the external source cable from

the TRIG IN connector to the CLOCK IN con-

nector.

Send:

init: cont on; : rosc :sour

ext

Verify lVp, 100

kHz

sine wave.

ns.

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Operation

Section

3

8.1 Introduction

This section provides the Operator/Programmer
with the information needed to operate the Model

1395 Arbitrary Waveform Synthesizer in a VXI sys­tem. The unit resides in a VXI chassis and is sub­ject to all of the restrictions and benefits of that

environment.

Paragraph 3.2 describes the Model 1395 connec-

tors and

LED

indicators. Paragraph 3.3 defines
the Model 1395 programming messages. Para­graph 3.4 demonstrates how to operate the Model

1395 using the defined messages.

8.Z Connectors and

LED

Indicators

This paragraph describes the Model 1395 front
panel connectors and LED indicators. Figure 3-1
illustrates the front panel; bold numbers identify
the indicators and connectors. Table 3-1 describes
the function of each item shown in figure 3-1.

8.3 Model 1395 Programming

The Model 1395 communicates within the SCPI
(Standard Commands for Programmable Instru­ments) and IEEE 488.2 standards. Therefore, the
Model 1395 must respond to two types of com­mands: SCPI commands and IEEE 488.2 Common
Commands. The IEEE 488.2 Common Commands

support functions that are common to all instru­ments, such as reset, self test and status reporting.
Common Commands are non-hierarchical (can be

included within

SCPI

commands without disturb­ing their hierarchical relationships) and are easily
identified by their leading asterisk

(*).

SCPI com­mands support functions that are specific to the
instrument.

This paragraph provides the following informa­tion:
SCPI Command Table Paragraph 3.3.1.
Command Message Format Paragraph 3.3.2.
Model 1395 SCPI Commands Paragraph 3.3.3.

IEEE 488.2 Common Commands Paragraph 3.3.4.

8.8.1

8CPI

Command

Table

Table 3-2 lists the SCPI commands used in the
Model 1395 and indicates their hierarchical rela-

tionships. The IEEE 488.2 Common Commands
are listed in a separate table (Table 3-5). The SCPI
Command

able-is

organized as follows:

Keyword

[SOURce]

:FREQuency

I

:CWl

:MODE

STARt
STOP

Parameter

Form

Notes

The indentations of

keywords

indicates their hierar­chical relationships according to a tree system.
The left-most edge is called the

root node.

Key­words closer to the root node are higher in hierar­chy; lower nodes are to the right of their parent
node. To program or query a

settable parameter,
the full path must be defined to reach the keyword
appended with the required parameter form.

A

SCPI programming string typically starts at the
root node and proceeds to the right through
branch nodes to the

leaf node.

This string of key-

words, separated by colons and completely defin-

ing a single path, is defined as a Program Header.

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50

MHz

Arbitrary

Waveform Synthesizer

model

1395

RUN

FAIL

CLK IWUT

MAIN

OUT

I

Figure

8-1.

Model

1885

Front Panel

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Table

8-1.

Model

I885

Front

Panel

ltem Name

RUN LED Indicator

FAIL LED Indicator

MODID LED Indicator

A16 LED Indicator

A24 LED Indicator

CLK IN/OUT Connector

TRIG IN Connector

POSN Connector

SYNC/H-SWP Connector

AM IN Connector

MAIN OUT Connector

Function

When lit, indicates the VXIbus Interface Module microprocessor
is running.

When lit, indicates the VXIbus Interface Module registers are
not initialized.

This indicator turns on momentarily indicatin

the

Resource

Manager has detected the presence of the Mo

cf

el 1395.

When lit, indicates that devices on the VXIbus are accessing the

generator's A16 registers.

This indicator illuminates during a VMEbus access to the A24

shared memory.
This connector receives an external TTL level signal as a wave-

form sample time clock, or outputs a TTL signal in the range of
125

mHz to 100 MHz.

This connector receives the external trigger signal for the Model

1395's triggered, gated, and sequence modes.

This connector outputs TTL pulses which can be set as Position
Markers at specific address locations within arbitrary wave-

forms.
This connector outputs TTL pulses as waveform Synchroniza-

tion Markers; and when the generator is sweeping frequency,
outputs a horizontal sweep voltage to indicate position within
the sweep.

This connector is the in ut for external signals to Amplitude
Modulate the MAIN

OBT.

This connector su plies the generator's waveform output. Out­put level is 15 m

\p

pp to 15 Vpp into 50Q.

The two forms of Program Headers are commonly
referred to as "commands" (see paragraph 3.3.2)

or as "queries" (see paragraph 3.3.2.6). A Program
Header followed by Program Data is defined as a
Program Message Unit (paragraph 3.3.2.1).

In the example above, the left-most keyword,
[SOURce], is directly off the root node. Nodes in
this position are called Subsystems, and all key­words indented under [SOURce] are part of the
Source Subsystem. FREQuency is one of the main
parameters under the Source Subsystem. The
third level keywords under FREQuency set or que­ry the various frequency related parameters. The
brackets around the SOURce and CW keywords

indicate that they are

implied

nodes, and they may
be included in or omitted from the Program Head­er at the programmer's option. When included, do

not use the brackets in the command. Referring to
Table 3-2, [SOURce] is the only Model 1395 Sub­system which is implied (in brackets). This is the

default Subsystem, and is assumed unless another

Subsystem is specified at the start of a command.

The root node itself is an implied node and is not

directly programmed. A colon at the start of a

command resets the SCPI parser (included in in-

strument firmware) to the root node. A leading

colon at the root node location is unnecessary (see

paragraph 3.3.2.3).

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3.3.1.1 Long

and

Short Form Keywords

3.3.2.3 Program Message Delimiters

The Model 1395 recognizes specific keywords that
must be in the accepted long or short format. No
other form of the keyword is accepted. For exam­ple, to send 'frequency' as part of a message, the
short form keyword, shown in the table as upper

case letters

'FREQ',

or the long form of the same
keyword containing both upper and lower case
characters

'~REQuenc

y'

may be sent. Equal
weight is given to upper and lower case characters
when sending messages to the Model 1395.

8.8.2

Con#nW

Message

Format

The following paragraphs provide the program-

mer/ operator with an introduction to the general
rules that must be followed when sending messag­es to the Model 1395. For an understanding be­yond what is covered in this paragraph, refer to
the appropriate SCPI and IEEE 488.2 documents.

Operating the Model 1395 is easy, provided the
programmer/operator pays strict attention to the
message format, as shown in this manual. Each
character, including spaces, must be properly
placed or the Model 1395 will record any unrecog­nized parts of the command string as an error.

Table

3-2

shows the Model 1395 message structure
and message relationships. Refer to this while
working within this paragraph.

To piece together the Program Message, the Model

1395 expects commands and parameters in the cor­rect order (per Table 3-2), separated by defined de­limiters: colons

(:),

semicolons

(;),

and-spaces

(

).

Use the colon to separate keywords within a Pro­gram Message Unit, for example,

V0LT:LEV:IMM:AMPL

5

Do not insert spaces between keywords and co­lons. Placing the optional colon at the beginning
of a Program Message Unit ensures the parser
starts from the "root" or top level. For example, a
complete message with the leading colon is as fol­lows:

The leading colon at the beginning of any new
message is optional because the Program Message
Terminator

(<pmt>) at the end of the previous

message sets the parser to the "root" level. The

leading colon is not shown for most messages in
this section.

The semicolon is used as a Program Message Unit

Separator

(<prns>). It permits multiple Program
Message Units to be linked together into a single
message. The colon may follow the semicolon to
start the next message unit at the "root". For ex­ample,

Note

S0UR:FREQ:CW 1E4;:OUTP

ON

The Model

1395

records programming errors

Without the colon following the semicolon, the

in

its memory. The programmer/operator must

message must start within the same subsystem as

use the

'SYs~ern

:

ERRor

?'

query to review

the previous message. For example:

these errors.

S0UR:FUNC

S1N;FREQ:CW

1E4

A space separates the Program Header from its

3.3.2.1 Program Message Unit

data, as shown in the previous example.

The Program Header (command or query) has
been previously defined as a complete single path

3.3.2.4 Parameter Forms

from the root node to a leaf node. It consists of

one or more keywords separated by colons. It

For the Model 1395, parameters may be in the

may also have a leading colon used to explicitly

form of a decimal numeric value (numeric-data),

select the root node as the starting point.

A

Pro-

alpha characters (character-data), Boolean data, or

gram Message Unit (<pmu>) consists of a Program

Definite Length Arbitrary Block data (paragraph

Header followed (optionally) by Program Data.

3.3.3.11). Examples of the first three are:
FREQ

10 0

0

(numeric-data)

3.3.2.2 Program Message

FUNC

SIN

(character-data)

A

Program Message (message) consists of one or

OUTP ON

(Boolean-data)
more <pmu>'s delineated by semicolons and fol­lowed by a Program Message Terminator,

<pmt>.

Notice that in all cases, a space separates the head­er from data.

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Table

3-2.

Model

1395

Command Summary

KEYWORD

CALibration

[

:ALL]

?

:

DATA

:AFCorrection

:

AMPLi tude

[

:GAIN]

:OFFSet
:=Zero
:OFFSet

[

:

GAIN]

:

OFFSet

:PAZero

:

SCMZero

:

STORe

:

STATe

INITiate

[:IMMediate]
:CONTinuous

OUTPu t

:

CLOCk

:

FREQuency

:

SOURce

:ECLTrg<n>

[

:

STATe ]

:

FILTer

[

:

LPASs

I

:

SELec t

t

:

STATe]

[

:

STATe]

:

SUMBUS

[

:

STATe]

:

TRIGger

:

MARKer

:

SOURce

:

END

[

:

STATe]

:TTLTrg<n>

[

:

STATe]

RESet

[

SOURce]

:AM

[

:

STATe]

:

MODE

:

CLOCk

:

CONFigure

PARAMETER FORM NOTES

en>

=

0

to

1

VXlbus

ECLTrigger lines

en>

=

0

to

7

VXlbus

TLTrigger lines

<Boolean-data>

(OFF)

<AM>

)

<sCM>

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Table

3-2.

Model

1395

Command Summary (Continued)

KEYWORD

[

SOURcel (continued)

:

P'REQuency

[

:CW

I

FIXedl

:

MANual

:

MODE

:

RASTer

:

STARt

:

STOP

:

FUNCtion

[

:

SIIAPe]

:

USER

:

MODE

:

LIST

:FREQuency

:

POINts

:

MARKer

:Position

:

AOFF

:

POINt

:

SYNC

:

SOURce

[

:

STATel

:

TRIGger

[

:

STATel

:

PKASe

[

:ADJustl

:LOCK

:ROSCillator

:

SOURce

:

SEQuence

:

ADVance

:

DWEL1

:FUNCtion

:

LENGth

:

TRIGger

:

MODE

:

SENSe

:

SUMBUS

[

:

STATel

:ATTenuation

:

SWEep

:

COUNt

:DIRection

:

SPACing

:

TIME

:MODE

PARAMETER FORM

<numeric-value>
<numeric-value>

<m

(

SWEep ( LIST>

<numeric-value>

numeric-value>

<numeric-value>

<shape-name> (<SINusoid

I

TRIangle 1 SQUare

RFSQuare

I

IIC

I

mSine ( PHSsine

(

PRAMP

1

NRAMp

I

~~~oise

I

USER I SMEMory I WTST>)

<trace-name>

<FIXed

1

SEQuence>

<AUTOmatic

(

TRIGgered >,<list-index>

<numeric-~alue>,<list~index>

<tracegame>,<list-index>

<numeric-value>

<Boolean-data>

(OFF)

<numeric-value>

NOTES

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Table

3-2.

Model

1395

Command Summary (Continued)

KEYWORD

[SOURcel (continued)

:

VOLTage

[

:

LEVel

I

[

:

IMMediatel

[:AMPLitudel

:

OFFSet

STATUS

:OPERation

:

CONDition

:

ENABle

:

ENABle?

[

:

EVENt

1

:

PRESet

:QUEStionable

:CONDition

:

ENABle

:

ENABle?

[

:

EVENt]

SYSTem

:

ERRor

?

:

DATE

:

TIME

:

VERSion?

TEST

[

:ALL]

?

:

RAM?

TRACe

:

CATalog?

:

DEFine

:

DATA

:

LINE

:

POINt

:

DELe t e

[

:NAME1

:

ALL

:DIRectory?

:

FREE?

:

LIMi ts

:

MODE

:

POINtS

PARAMETER FORM

.(value is new trace size)
:arbitrary block data)

points available, in-use

(value is new trace size)

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Table

3-2.

Model

1395

Command Summary (Continued)

KEYWORD

TRIGger

:

COUNt

:

GATE

[

:

STATe

1

[

:

IMMediate]

:

POLari

ty

:

SOURce

[

:

STARt

I

:

ADVanc e

:

TIMer

PARAMETER FORM

<numeric-value>

<Boolean-data>

(OPP)

<Positive I NEGative>

<INTernal

(

EXTernal 1 C'n

TIZTrg<n.>

<INTernal

1

EXTernal 1 CHAin

cnumeric-value>

Numeric data values for most parameters may be
in the form of an integer, a fixed or floating point

value, or a special keyword as shown in the fol-

lowing:

integer;

FREQ

1000

fixed point;

FREQ

10.1

floating point;

FREQ

10E3

special

form

character;

FREQ

MIN

When any of the three special form decimal

<numer

i

c-va lue > keywords, 'MINimumf,
'M~~imum', or 'D~Faul t', are sent, the parame­ter being addressed is set to a predetermined

<numeric-value>. The

'M~~imurn' and

'MIN-

imum' <numeric-values> are the upper and

lower limit values of the parameter. The

'DE-

Fault' <numeric-value> is within the limits
of the parameter selected. Defaults values are list­ed in paragraph

3.4.3.

The Model

1395

uses several character data key-

words. These are shown in Table

3-2.

Boolean data expresses an enabled ("on" or

"1")

or

disabled ("off" or

"0")

state.

3.3.2.5

Program Message Terminators

The Model

1395

accepts New Line (NL

,

<LF>),

END, or

NL

with

END

as the Program Message Ter-

minator (<pmt>). However, the

END

(<EoI>) is

NOTES

en>

=

0

to

7

VXlbus

'ITLTrigger

lines

(2e-7,1

e3,l

e4)

the preferred

<pmt

>

because it initiates an imme­diate transfer from the input buffer to the Lan­guage Processor for parsing. The other
terminators may be delayed until the buffer fills.

3.3.2.6

Queries

Unless otherwise indicated, each header with a
parameter form also has a query form so that the
current setting may be reported back.

A

query is
programmed by following the leaf node keyword
with a question mark

(?),

no space. For example,

send:

or the reduced form:

FREQ?

to query the frequency setting. The response for
this query is a floating point numerical value
representing the frequency in Hertz. For example,
if the response is

1

kHz, the returned value is:

For queries that include parameters, the ques­tion mark and a space are inserted prior to the
parameter; for example:

FREQ?

MAX

Some commands may exist in query form only,
for example:

SY ST

:

ERR?

Some queries are mandated such as

*

E

s

E

?

,

*

SRE?, and *TST?; see paragraph

3.3.4.

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8.8.8

Model

1885

8CPI

Commands

This paragraph introduces the operator to the
Model 1395 Program Message Units. Paragraph

3.4 covers the relationship between these units.
For a description of message format, refer to para­graph 3.3.2. This paragraph uses only the short
form keyword recognized by the Model 1395 (refer
to Table 3-2). Program Message Terminators are
assumed, and therefore not shown in the examples.
However, most optional keywords are shown to
document the program flow.

3.3.3.1

CALibration Subsystem

The Calibration query causes an internal self cali­bration to be performed and a response to be
placed in the Output Queue. The response to the
*CAL? query is an ASCII string representing an in­teger value. The value of

"0"

is returned if the
auto calibration passed and a non-zero value in
the range of 32767 to -32768 is returned if the auto
calibration failed. The interpretation of the value
returned in the event of a failed self calibration is

defined in Appendix

A.

The *CAL? query invokes the same internal self

calibration functions and returns the same re-

sponse as the CALibration[:ALL]? query docu­mented below. Following is the CALibration
Subsystem excerpted from the Command Table:

CALibration

[

:ALL]

?

:

DATA <block>

:AFCorrection<point>,

<frequency>,<gain>

:AMPLitude

[

:GAIN] <numeric-value>

:OFFSet <numeric-value>
:AMZero <numeric-value>
:OFFSet

[

:

GAIN] <~~~itivel~~~ative>,

<numeric-value>

:PAZero <numeric-value>

:

SCMZero <numeric-value>

:

STORe

:STATe <boolean>

Performs a

DC

calibration of the output amplitude
and offset voltage levels and stores the calibration
data in nonvolatile memory. If the calibration is
successful, use of the data is enabled. If the cali­bration is unsuccessful for any reason, use of the
data is disabled and default correction factors are
used.

This query returns a value of

"0"

if the auto-cali­bration is successful and a non-zero positive inte­ger value if not. The response value will indicate
the nature of the failure.

The value of a 16-bit Self Calibration Status Word

is returned in response to the calibration query.
The format of the Self Calibration Status Word is
shown below:

Self

Calibration Status Word

Cal~bralm

Number

The Self Calibration Status Word is split into two
fields, one occupying the lower eight bits and the
other occupying the upper eight bits.

Ermr

Cods

The Calibration Number field contains the number
of the first sub-calibration in which a failure was
detected. Sub-calibration numbers range from

1

to

255. Sub-calibrations are performed in the same
sequence as they are numbered.

sd1514131211

10

9

8

7

6

5

4

3

2

10

The Error Code field contains a bit weighted code
that is unique to the sub-calibration. Refer to Ap­pendix A for more information.

Allows calibration data to be transferred directly
to and from the Trace Memory in the form of Arbi­trary Block Program Data. The

CALibrate: DATA: STORe

command must be
used if data is to be transferred to the EEPROM.
The format of this data will be documented in Sec­tion 5 of this manual.

Sending this program message sets the amplitude
gain correction for a specified frequency point.
The value of "point" is an index into a table of
gain corrections, and it should be an integer rang-

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ing from 0 to

5.

Associated with each gain correc­tion is the frequency at which the gain correction
was calculated. The default table is shown below:

Gain

7

MHz

1

.O

20 MHz

1

4

1

1.0

Internally the value of the gain parameter defaults
to 1.0. Programmed gains should not be too far
from this value. The gain and frequency parame­ters for points 0 and 5 should remain unchanged.

25

MHz

Between frequency points, linear interpolation is
used to calculate the gain correction of the ampli­tude. The frequency points chosen correspond to
the average position of the break points in the fre­quency response of the elliptic filter.

Allows the contents of the amplitude gain correc-

tion table to be queried. The response is in the
format:

5

Sending this program message directly sets the
gain of the amplitude control DAC. This value is
usually calculated by the self calibration, and has
a DEFault and MINimum value of 0.0 and a

MAX­imum value of 1000. This value may also be que­ried.

1

.O

Sending this program message directly sets the
offset of the amplitude control. Self calibration
usually calculates this value, which has a DEFault
value of 2048, a MIMimum value of 0, and a MAX-

imum value of 4095. This value is an integer and
may also be queried.

Sending this program message directly sets the
Amplitude Modulation Zero DAC. The numeric
value is an integer value between

0 and 4095 cor­responding to the range of the 12-bit DAC. This
value defaults to 2048. Self calibration usually de­termines this value. This value may also be que­ried.

Sending this program message directly sets the
gain of the output offset voltage control

DACs.
Self calibration usually calculates this value,
which has a DEFault and MINimum value of 0.0
and a MAXimum value of 1000. This value may
also be queried, as follows:

Sending this program message directly sets the
output offset voltage control offset. Self calibra­tion usually calculates this value, which has a

DE­Fault value of 2048, a MINimum value of 0, and a
MAXimum value of 4095. This value is an integer
and may also be queried using the query shown
below.

Sending this program message directly sets the
DAC controlling the preamplifier zero correction.
This parameter is an integer value between 0 and
4095 which corresponds to the range of the 12-bit
DAC. This value defaults to 2048. Self calibration
usually determines this value, which may also be
queried.

Sending this program message directly sets the
DAC controlling the Suppressed Carrier Modula­tion Zero. The parameter is an integer value be-

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tween 0 and

4095

corresponding to the range of
the 12-bit DAC. This value defaults to 2048, and
may be queried.

Sending this program message causes correction
data that has been downloaded using the program
messages in the

CALibrate:DATA subsystem to be

stored into non-volatile memory. This should be

done only after all correction data has been final­ized so as to minimize writes to the EEPROM.

Enables correction of the output amplitude and
offset voltage levels using the calibration data
stored in non-volatile memory. If the calibration
corrections are disabled then default corrections

are used.

3.3.3.2

INlTiate Subsystem

INITiate

[:IMMediate]
:CONTinuous <Boolean>

INITiate

[

:

IMMediate]

This command is included to support the SCPI
specification, but it does not alter the setup of the
Model 1395.

Sending this program message selects between
continuous mode of operation and a non-continu­ous mode of operation. In continuous, the select­ed trace or function is continuously output at the
module's Main Out, using the (default) command:

Non-continuous modes include Triggered and
Gated modes. Triggered mode outputs the select­ed trace or function for a number of cycles deter­mined by the trigger

COUNt once per triggering
event at the module's Main Out, using the com­mand:

1NIT:CONT 0FF;:TRIG:GATE OFF;

:TRIG:COUN <value>

Gated mode causes the selected function or trace

to be output while the trigger source is true, and
quiescent while the source is false.

3.3.3.3

OUTPut

Subsystem

OUTPut

:

CLOCk

:FREQuency <numeric-value>
:SOURce RASTer

I

SYNThesizer

:ECLTrg<n>

[

:

STATel <Boolean>

:

FILTer

[

:

LPASs

I

:

SELect BESSel I ELLiptic

[

:

STATe

I

<Boolean>

[

:

STATel <Boolean>

[

:

STATel <Boolean>

:

TRIGger

:MARKer TRIGger

1

Position

:SOURce

BIT

I

BCOMplete I LCOM-

plete

(

INTernal

:

END

[

:

STATe] <Boolean>

:TTLTrg<n>

[

:

STATel <Boolean>

0UTPut:CLOCk:FREQuency

<numeric-value>(le3)

Sets up the CLK IN/OUT BNC as an output sourc­ing a clock signal with the specified frequency.
The output clock frequency ranges from

le-1 to
le8 Hz, with le3 as the default value. This com­mand causes all other outputs to be turned off and
completely reconfigures the internal state of the
instrument to support this mode of operation.

Selects the source of the clock output to the CLK
IN/OUT BNC.

RASTer

Raster clock. When the trace mode

is set to raster using the program message:
TRACe:MODE RASTer
then the raster frequency can be pro-

grammed using the program message:

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The Trigger Marker is an internal signal generated
to condition selected trigger outputs. Selected by
0UTPut:TRIGger:MARKer as TRIGger (end of
trace). This command selects which trace(s) will
generate Trigger Markers, and thus trigger out­puts to the VXI Local Bus or TTL Trigger lines.
Queried with the following:

Controls the phase of the output waveform. The
parameter has units of degrees. The value de­faults at

0 degrees and ranges from -180 to +I80

degrees.

Enables phase locking between modules. Phase
locked modules must reside in adjacent slots in
the VXIbus chassis, because phase lock signals use
the VXIbus Local Bus. In order for two or more
modules to be phase locked they must have traces
of the same size running at the same frequency.

For tight coupling, all modules should be using

the same clock. This is done by having the "mas-

ter" module, usually the left-most module in the

group, output its clock to the backplane. The

Clock output is enabled with the command

OUT-

Put: ECLTrg<n>

[

:

STATel ON.

All modules,

including the Master, must source the master

module's clock output from the backplane. This is

done by using the command

[

S OURc e

:

I

R0SCillator:SOURce ECLTrg<n>.

Selects the source of the reference oscillator.

INTernal Selects the output of an internal

frequency synthesizer.

ECLTrgcn> Selects the signal from one of

the VXIbus ECL Trigger Lines on the back­plane.

EXTernal Selects the signal from the

CLOCK INIOUT BNC.

This

BNC

must be
configured as an input using the com­mand:

Selects the conditions under which the sequence
advances to the next trace.

AUTOmatic

Advances to the next trace in
the sequence automatically after the repeat
count.

TRIGgered Waits for a trigger after the re-

peat count before advancing to the next
trace in the sequence.

The index ranges from

0

to 3 as the Sequence

Length ranges from

1

to

4.

The query form

SEQuence :AD-Vance? <index>

returns

AUTO

or

TRIG

for the segment selected by the in-

dex suffix.

Defines a list of user defined functions which are
to be sequenced through when the function mode
is set to Sequence with the command

[

s

OURC e

:

I

FUNC tion: MODE SEQuence.

In the Model

1395

the number of elements in this list is limited

to four. The index value is set from 0 to

3

as the

[SOURce: I SEQuence : LENG~~

command

ranges from

1

to

4.

The query form

SEQuence : FUNCtion? <index>

returns the
trace name for the segment selected by the index
suffix.

Defines the repeat count, the number of times to
cycle through the specified function in the func-

tion list. There is a one-to-one correspondence be­tween elements in the function list and elements
in the dwell list. Programming the dwell to

0

will
cause the function to be repeated indefinitely
(continuous dwell), so a TRIGgered ADVance con­dition should be set up so that advance to the next
segment will occur on a trigger. The index ranges
from

0 to

3

as the Sequence Length ranges from

1

to

4.

The query form

SEQuence : DWELl? <in-

dex>

returns the numeric dwell value for the seg-

ment selected by the index suffix.

Defines the number of traces in the sequence. The

maximum sequence length is

4.

[SOURce:lCLOCk:CONFigure

INPut

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3.3.3.4

RESet Subsystem

RESet

Resets all parameters to their default state (see
paragraph

3.4.3).

This command has no effect on

the Trace subsystem.

3.3.3.5

SOURce Subsystem

[

SOURce

I

:

AM

:STATe <Boolean>

OFF

:MODE <AM

I

SCM>

:

CLOCk

:CONFigure <INPutlo~~~ut>

:FREQuency

[:cwIFIx~~] <numeric-value>
:MANual <numeric-value>
:MODE <CW~SWE~~~LIST>
:RASTer <numeric-value>
:STARt <numeric-value>
:STOP <numeric-value>

:FUNCtion

[

:

SHAPel <shape-name>

:USER

<

trace-name>

:MODE <FIXedI~~~uence>

:LIST

:FREQuency <numeric-value>,

<list-index>

:POINts <numeric-value>

:

MARKer

:Position

:AOFF <trace-name>
:POINt<trace-name>,

<point-index>

:

SYNC

:

SOURce <ZCROSS~BBITS>

[

:

STATe ] <Boolean>

:

TRIGger

[

:

STATe

I

<trace-name>,

<Boolean>

:

PHASe

[:ADJust] <numeric-value>
:LOCK <Boolean>

:

SEQuence

:

ADVance <Au~~nIaticl

~~IGgered>,<list-index>

:

FUNCtion <trace-name>,

<listwindex>

:LENGth <numeric-value>

:

TRIGger

:MODE

<S~~~hronous~~~~~chronous~

[

:

STATe] <Boolean>

:

SWEep

Enables the amplitude modulation input

(AM

IN

BNC).

Selects the amplitude modulation mode.

AM

Standard 0 to

100

%

amplitude modu-

lation.

SCM Suppressed carrier amplitude modu-

lation (also referred to as Double-Sideband
Suppressed Carrier).

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[

SOURce

:

I

SWEep : TIME

3.3.3.6

STATUS

Subsystem

Sets the duration of the sweep in seconds. The

sweep time may range from 30 ms to 1000 s.

[SOURce:]VOLTage[:LEVel]

[:IMMediate]

[

:

AMPLi tude

I

<numeric-value>

(1)

Sets the absolute value of the maximum amplitude
voltage. Default is

1

Vp and allowable values

range from 0 to 7.5 Vp.
The amplitude voltage is at maximum when the

selected trace point is at its minimum or maxi­mum value. The value of a point in trace memory

affects the output amplitude in the manner shown
in the following diagram.

Point

V.IUe

CWh

-

-

-

-

----

+arnpHudeR

Trace Point Value

vs.

Amplitude Nomengraph

Each point in Trace Memory contains a value in
the range OOOh (0) to FFFh (4095). As Trace Memo­ry is scanned these values are converted to analog

voltages for output. The ARB is calibrated so that

the value 800h corresponds to

0 volts amplitude

and the values OOlh and FFFh correspond to the

negative and positive full scale amplitude voltag-

es.
All internally generated traces of a cyclical nature

(SINusoid, SQUare, TRIangle, etc.) are generated
such that their most negative point has a value of
OOlh and their most positive point has a value of
FFFh. This makes their amplitude voltages sym­metrical about

0 volts and the absolute value of
their peak voltages equal to the programmed am­plitude in Vp.

STATus

:

OPERation

:CONDition?

:ENABle <NRf>

[:EVENt]

?

:

PRESet

:QUEStionable

:

CONDition?

:ENABle

<NRf>

[:EVENt]?

Returns the contents of the Operation Condition
Register. The Model 1395 supports this query, but
will only return the value "0", indicating opera­tional condition.

Sets the enable mask of the Operation Event Reg­ister, which allows true conditions to be reported
in the summary bit. The Model 1395 supports the
command by saving the mask value and by not
generating an error, although the Status registers

do not exist.

The <NRf> notation indicates that SCPI's <numer-

ic- value> format is not used in this case. Refer to
the IEEE-488.2 <DECIMAL NUMERIC PROGRAM
DATA>, flexible Numeric Representation for more
information.

The

STATus : OPERation: ENABle?

query re­turns the enable mask of the Operation Event Reg­ister. The Model 1395 returns the value sent
previously with the command above using the
<NRl> format.

Returns the contents of the Operation Event Regis­ter. The Model 1395 supports this query, but will

only return the value "0", indicating operational

condition.

STATus:PRESet

Sets the enable registers to all 1's. The Model 1395
accepts the command without performing any ac-

tion.

Controls the level of the output offset voltage. Al­lowable values are from

-7.5

Vdc to +7.5 Vdc.

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HFSQuare High frequency square wave.

This square wave has faster rise and fall
times than the standard square wave. Its
maximum frequency is 25 MHz.

NHSine Negative haversine.

NRAMp Negative ramp.
PHSine Positive haversine.
PRAMp Positive ramp.

PRNoise Periodic random noise.
SINusoid A sinusoidal signal.
SMEMory Uses the data located in the first

8k bytes of the VXIbus A24 Shared Memo­ry. Data in Shared Memory is organized as
4096, 16-bit words. Each word is an inte­ger value between

1

and 4095.
SQUare A square wave signal.
WTST An alternating pattern of high and

low values. The values 4095 and

1

are al­ternately written to every point in the
trace. This pattern is used for factory
maintenance procedures.

TRIangle A triangle wave signal.

USER Selects the user defined function

specified by the

SOURC~:

FUNC~~O~:USER

command.
Selecting a user function automatically
switches the method of waveform genera­tion

to

raster scan.

Selects one of the user functions defined under the
Trace subsystem. The user function will be output
only if USER is selected by the

[

SOURce

:

I

FUNC t ion

[

:

SHAPe

I

command.

Controls the function sequence logic. If the func­tion mode is set

to

FIXed then the output function

is determined by

[

SOuRc e : ] FUNC t i on

[

:

SHAPe]

parameter. If the function mode is set
to SEQuence then the output function is deter­mined by the contents of the sequence table.

This command allows the elements in the Fre­quency List to be modified

by

the user. The Fre­quency List is a table of frequency values which is
utilized when

[

SOURce

:

1

FREQuency :MODE

LIST

is programmed. The frequency values in
the list may range from le-3 to 2e7. Each element
in the list has a default value of le3. The Frequen­cy List contains 1024 elements with indices from 0
to 1023. The number of "active" elements in the

list is set with the

[

SOURce

:

1

LIST : POINts

command. The query form of this command re­turns the frequency value at a specified index lo­cation, as follows:

[SOUr:]list:freq? <list-index>

This command allows the active length of the Fre­quency list to be modified by the user. This value
defaults to

1

and ranges from 1 to 1024.

Sets all POSITION marker bits to the inactive

state. There is no query form for this command.

[SOURce:]MARKer:POSition:POINt

~trace~name~,~point<trace_name>,<point_index>inde~>

Sets the POSITION marker at the specified point
within the specified trace to the active state.
There is no query form for this command. "Point
index" is an integer value.

[SOURce: ] MARKer : SYNC

[

:

STATel

<ON 1 OFF>

Enables the SYNC marker output. This command
will be accepted but will not perform any func­tion since there is no way to disable this output.

Selects the method used to generate the SYNC
marker output.

ZCROss

Selects the output of a comparator.
Comparator output is high if the instanta­neous signal is above mid-scale level and
low if the signal is below mid-scale level.

BBITs

The Marker signal is derived from a

bit in Trace RAM.

The bit is set so that the

marker is active for the first several points

of the trace.

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TEST:

RAM?

Performs a destructive test of the Trace Memory.
A

result of zero is returned if the test passed.

A

non-zero result is returned if the test failed. Inter­pretation of the 16-bit result code will indicate the
nature of the error. Bits

15

through

12

encode the
sub-test number on which the first failure was de­tected. The interpretation of the rest of the bits in
the response depends on the sub-test. Refer to the
Trace Memory test documentation in Appendix

B

for a full interpretation of the Error Code.

Test

Number

Error

Code

1

8'151413121110 8 8

7

6

5

4

3 2

10

Trace Memory Test Response Format

3.3.3.9

Trace Subsystem

TRACe

:CATalog?
:DEFine <trace-name>,

(<numeric-value>,

I

<trace-name>)

[

:

DATA1 <trace-name>, (<block>

I

<trace-name>)

:LINE <trace-name>,

<point-indexl>,
<point-valuel>,

Returns a string containing the names of all

de-

fined traces. Trace names are separated by com­mas.

Creates a new trace with the name specified by the
first parameter. The second parameter may be a
numeric value indicating the size of the new trace
or it may be the name of another trace which is to
be copied.

Initializes the contents of the trace whose name is

specified by the first parameter. The second pa-

rameter may be binary data in Definite Length Ar-

bitrary Block Data format**, the name of another

defined trace, or the name of one of the standard
functions. This command operates on the portion
of the destination trace within its "trace limits" as
set

by

the

TRACe : LIMi ts

command.

When another trace is specified as the data source

the source data is scaled horizontally to fit the
destination trace. Data is copied from the area of
the source trace specified by its trace limits to the
area of the destination trace specified by its trace
limits.

When a standard function is specified as the data
source it is scaled horizontally to fit the area of the
destination trace specified by its trace limits.

When the pseudo-standard function

SMEMory is
used as a source, data is copied from the base ad­dress of the A24 Shared Memory point by point up
to the number of points needed to fill the area of
the destination trace specified by its trace limits.

**See paragraph

3.3.3.11

for a description of

the

IEEE-488.2

Definite Length Arbitra

y

Block Data format.

Returns the contents of the trace whose name is
specified by the first parameter in Definite Length
Arbitrary Block Data format**. Only the data con-

tained in the portion of the trace set by the trace

limits is returned.

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Defines the transition mode from the current trace

to the next trace in the sequence after a trigger is
received.

SYNChronous

After advance conditions
are met, waits until end of current trace be­fore selecting next trace in sequence.

ASYNchronous After advance conditions

are met, selects next trace in sequence im­mediately.

Defines the active portion of the trigger signal.

EDGE

The rising edge of the trigger signal
initiates an action. When all other advance
conditions are met, the triggering signal
must make a false to true transition to de­fine a trigger event.

LEVel The level of the trigger signal ini-

tiates an action. If the other advance con­ditions become true, and the triggering
signal level is true, then the trigger event
occurs.

[

SOURce

:

]

SUMBus

[

:

STAT^]

<ON

(OFF>

Enables the analog sum input from the backplane.

Controls the level of attenuation in the path of the
analog sum input from the backplane. This com­mand accepts an integer value in the range

0

to 42
and rounds the value down to one of the following
attenuation levels:

0

dB (tl), 6 dB (+2), 12 dB (+4),

18 dB (-8),24 dB (+16),

30

dB (t32), 36 dB (t64), or

42 dB (e128).

Determines the number of sweeps which are en­abled by a single trigger event when Sweep is in a
non-continuous mode. Default value is 1. Allow­able values range from

1

to 1 million.

Controls the sweep direction. If UP is selected the
sweep is performed in ascending order from

STARt to STOP. If DOWN is selected the output
frequency is swept from STOP to STARt.

[SOURce:]SWEep:MODE

<CRES~~~TRES~~

~HRES~~~CREV~~S~~TREV~~S~

IHREV~~S~(MANU~~>

Sets the mode of the sweep. The sweep modes

have the following characteristics:

CRESet

Sweeps from the start frequency to
the stop frequency and then returns to the
start frequency in a continuous loop.

TRESet Waits for a trigger and then sweeps

from the start frequency to the stop fre­quency and then resets to the start fre­quency.

HRESet Waits for a trigger and then sweeps

from the start frequency to the stop fre­quency and then waits for another trigger
before returning to the start frequency.

CREVerse Sweeps from the start frequency

to the stop frequency and then sweeps
back to the start frequency in a continuous

loop.

TREVerse Waits for a trigger and then

sweeps from the start frequency to the stop
frequency and then sweeps back to the
start frequency.

HREVerse Waits for a trigger and then

sweeps from the start frequency to the stop
frequency and then waits for another trig­ger before sweeping back to the start fre­quency.

MANual Uses the frequency set by the

[

SOURce

:

I

FREQuency :MANual

com­mand if it is within the range of frequen­cies set by the

[

SOURce

:

I

FREQuency

:

STAR^

and

[

SOURce: I FREQuency: STOP

com-

mands.

Determines the frequency verses time characteris­tics of the sweep.

LINear

Output frequency is swept linearly

between the STARt and STOP frequencies.

LOGarithmic Output frequency is swept

on a logarithmic curve fitted between the
STARt and STOP frequencies. This objec­tive of the logarithmic sweep is to spend

equal amounts of time within each octave
or decade of frequency.

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3.3.3.10

TRlGger Subsystem

TRIGger

:COUNt

<numeric-value>

:

GATE

[

:

STATel <Boolean>
[:IMMediate]
:POLarity<POSitive

1

NEGative>

:

SOURce

[

:

STARt] <~~~ernallE~Ternal

IcHA~~~EcH~~~~TTLT~~<~>>

:

ADVance <~~Ternall~~Ternal

Ic~Ainl~cHain>

:TIMer

<numeric-value>

This command sets the number of times to cycle
through a trace after a trigger is received. Default
value is

1.

The COUNt value ranges from 1 to

1,048,575 for triggered waveforms

(FUNC

t

i

on

:

MODE

FIX^^)

and from 1 to

524,288 for triggered sequences

(FUNC

-

tion:

MODE

~~Quence).

This command selects a gated mode of operation
when the selected trigger source is external.

This command immediately triggers the instru-

ment, independent of which trigger source is se­lected.

This command selects the active trigger level.

Selects the source of the STARt trigger signal. The
STARt trigger signal is used to initiate activity
when the instrument is in a triggered mode of op­eration. It also initiates the start of the first pass
through a Sequence in Continuous Mode.

EXTernal Selects the external TRIG IN BNC

as the trigger source.

INTernal

Selects an instrument dependent

internal signal as the trigger source.

CHAin Selects the CHAIN trigger signal

from the local bus. This signal is used to
receive a trigger signal

from

an adjacent

module to the left in a chain.

ECHAin Selects the

END

CHAIN

trigger
signal from the local bus. This signal is
typically used by the first (left-most) mod­ule in a chain to receive a trigger signal
from the last module in the chain.

TTLTrg<n> Selects one of the VXIbus

TTL

Trigger Lines from the backplane. Valid
numeric suffixes are in the range

0

through

7.

INTernal ( CHAin

I

ECHAin>

Selects the source of the ADVance trigger signal.
The ADVance trigger signal is used to advance a
Sequence from segment to segment. The source
selection definitions are the same as for the STARt
trigger.

Sets the period of an internal periodic signal
source. The timer signal acts as a trigger when the
selected trigger source is

INTernal. Default value

is

1E-3.

It ranges from 2e-7 to le4 seconds with

2e-7 resolution.

3.3.3.11

High

Speed

Binary

Waveform Transfer

The Model 1395's SCPI command

TRACe

[

:DATA1

<trace-name>, <block> is
used to download user-defined Waveforms from
the remote controller to the ARB. Likewise, the
queryform~~~~e[:~~~~l? <trace-name>
is used to upload the waveform data back up to
the controller. In both of these cases, the data
block is transferred using the IEEE-488.2 Definite
Length Arbitrary Block Data format (see the figure
below). This format for block data transfer makes
it possible to rapidly move the large amount of
data required for arbitrary waveforms.

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Returns the contents of the Operation Condition
Register. The Model

1395

supports this query, but
will only return the value "0", indicating opera­tional condition.

Sets the enable mask of the Operation Event Reg-

ister, which allows true conditions to be reported
in the summary bit. The Model

1395

supports the
command by saving the mask value and by not
generating an error, although the Status registers
do not exist.

The

<NRf> notation indicates that SCPI's Cnumer­ic- value> format is not used in this case. Refer to
the IEEE-488.2 <DECIMAL NUMERIC PROGRAM
DATA>, flexible Numeric Representation for more
information.

The

STATUS

:o~~~ation:ENABle?

query re­turns the enable mask of the Operation Event Reg­ister. The Model

1395

returns the value sent
previously with the command above using the
<NRl> format.

Returns the contents of the Operation Event Regis­ter. The Model

1395

supports this query, but will
only return the value "0", indicating operational
condition.

3.3.3.7 SYSTem Subsystem

SYSTem

:

ERRor?

:

DATE <year>,<month>,<day>

:

VERS ion?

Returns the next message from the system error
queue. With each query, the unit returns a num­ber followed by a brief description. The error
queue holds up to eight errors, with one returned
for each query sent, until the queue is empty. Ta­ble

3-4

describes the system error messages.

Sets the system date.

Returns the system's idea of the date in the follow­ing format:

Sets the system time.

Returns the system's idea of the time in the fol-

lowing format:

Returns the system's firmware version number us­ing the following format:

3.3.3.8 TEST Subsystem

The TEST subsystem is an area where device spe­cific commands can be added to facilitate testing.
The

TEST

[

:

ALL

I

?

query in this subsystem per-

forms the same SELF TEST function as the IEEE-

488.2 Common Command

*

TST?

TEST

[

:ALL]

?

:

RAM?

TEST

[

:ALL]

?

Performs a non-destructive test on the application
card hardware.

A

result of zero is returned if the
test passed. A non-zero result is returned if the
test failed. Interpretation of the result code will

indicate the nature of the error. The format of the
16-bit result code is shown below:

I

TO61

Nu*

I

Em

Cob

B'151413121110

9 8

7

8

5

4

3

2

10

TEST[:ALL?]

Response Format

The upper 8-bits of the result code contain the
sub-test number in which a failure was detected.
The lower 8-bits contain a bit-weighted error code
that indicates the exact cause of the failure. The
sub-test descriptions and the meanings of their re-

sult codes are documented in Appendix

B.

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Table 3-4. Error Messages

Error Number

Message

-

--

"NO error'
'Command error"
'Invalid character"
'Syntax error"
"Invalid separator"
'Data type error"

"GET

not allowed"
"Parameter not allowed"
'Command header error"

'Header separator error"

"Program mnemonic too long"

"Undefined header"
"Header suffix out of range"

"Numeric data error"

"Invalid character in number"
"Exponent too large"
Too many digits"
"Numeric data not allowed"
"Suffix error"
"Invalid suffix"
"Suffix too long"
'Character data error'
"Character data too long"
"Character data not allowed"
'String data error'
"Invalid string data'
'String data not allowed"
"Block data error"
'Invalid block data'
"Block data not allowed"
"Expression error"
'Invalid expression"
'Expression data not allowed"
"Macro error"
"Invalid outside macro definition"
"Invalid inside macro definition"
'Macro parameter error"
"Execution error'
"Invalid while in local"
'Settings lost due to

rtl"

"Trigger error"

Error Number

Message

'Data out of range"
"Too much data'
"Illegal parameter value'
'Data corrupt or stale'
"Data questionable'
'Hardware error'
'Hardware missing'
'Mass storage error"
'Missing mass storage'
"Missing mediam
'Corrupt media'
'Media full"
"Directory full'
'file name error'
"Media protected"
'Expression errorn
"Math error in expression'
'Macro error"
"Macro syntax error'
'Macro execution error"
'Illegal macro label'
'Macro parameter error'
'Macro definition too long"
'Macro recursion error'
'Macro redefinition not allowed"
'Macro header not found"
'Program error"
'Cannot create program'
'Illegal program name"
'Illegal variable name'
"Program currently running"
'Program syntax error"

'Program run time error'

'Device specific errorn

'System error'
"Memory error"

1

"PUD

Memory lost'

I

'Savelrecall memory lost'

1

'Configuration memory lost'
'Self test failed"

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To send a block of waveform data, send an ASCII

"#"

($23),

then an ASCII encoded digit whose val-

ue signifies the number of digits in the byte count,

then ASCII encoded digit(s) representing the byte

count, then the two byte binary data words (MSB

first). The byte count is twice the number of
points to be downloaded to the trace. The byte
count must exactly correspond to the number of
bytes in the block of data. Each point is composed
of two bytes representing a 12-bit unsigned inte­ger between

0

and 4095.

Prior to downloading a Waveform using the
TRACe

[:DATA]

<trace-name>,<block>
command, the Trace must be first defined. Send
the~~~~e:DEFine <trace-name>, <val­ue> command to define a Trace with a size of

<value> points under the name

<

t

rac e-name>. This also presets the Trace Lim­its for this trace at full size. You may select a seg­ment of this trace for download (or subsequently,

for upload) using the

TRACe

:

LIMi

ts

<trace~name~,~start<trace_name>,<start_index>,<stop_inde~~,~~topP

index> command.

Note

When the block size exceeds the capability of

your download/upload application, you may

use the TRACe:LIMitsfeature to break the
block

up

into manageable segments.

The "binary" transfer using this format occurs at a
relatively high speed because the binary data is
not parsed through the

1395's Command Proces-

sor. Instead, the binary data is routed directly to

the Trace RAM without processing or limit check-

ing, much like a direct memory access (DMA). If
the waveform limits (size), the byte count or the
number of bytes in the

<block> are not all in nu­meric agreement, the high speed transfer will be
aborted. Any data received after this will be inter­preted by the Command Processor as ASCII char­acters and will cause the Model 1395 to generate
many error messages.

Definite Length Arbitrary Block Data Format

non-zero high byte

+

ASCll digit

low byte

ASCII digit (binary) (binary)

?

number of byte count

digits in byte count 2

x

number of
points

&

high

byte

+

4-

low

byte

-&

87654321 87654321

1514131211109B 76543210

MSB

LSB

markers:

each point

is

12-bit binary value

(0 to

4096

decimal)

8

-

sync

marker

7 - position

marker

6

-

trigger marker

5

-

2-Axis

marker

2

bytes per point

(see format below)

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OUT

connector, with

R,

representing the Model

1395

source impedance,

R,

representing the termi-

nation or load resistance, and

R,,

representing the

receiving instrument input impedance. Table

3-6

lists all the input and output impedances of the

Model

1395.

Table

3-6

Input

and

Output Impedances

Connector

MAIN OUT

SYNC OUT/

H-SWP OUT

POSN OUT

TRIG IN
CLK

IN/

CLK OUT

AM IN

Impedance

50Q
50Q,

TIZ

(0 to

>2.4

V terminated)

60052

SOQ,

'ITL

(0 to >2.4 V terminated)

2

kQ

2

WZ

shunted by 10 pF

5052,

T1Z

(0 to >2.4 V terminated)

10 kR

8.4.2 Input/Output

Protection

The Model

1395

provides protection for internal
circuitry connected to input and output connec­tors. Refer to the Specifications in Section

1

of

this manual to determine the level of protection

associated with each input or output connector.

8.4.8

Power

OnIReset Defaults

At power on, or as the result of sending

RESet

or

*RST

(except that the Trace Subsystem is not ef-

fected by a reset), the Model

1395

defaults to the

following conditions:
Subsystem SOURce

Operational Mode CONTinuous

Trace Mode CW (vs. RASTer)

Function Mode FIXed (SEQuence disabled)
Phase Lock OFF
Phase value 0 degrees
Reference Oscillator

INTernal
Frequency Mode CW (Sweep Off)
Frequency value

1

kHz

(at MAIN OUT)

Amplitude value

2

Vpp (1 Vp)

Offset value

0

Vdc

FunctionSINusoid

Main Output OFF

Waveform Filter 20 MHz ELLiptic,

ON

Sync Marker Output

ON, ZCRoss (zero crossing)

Position Marker Output

ON, markers AOFF

(all

off)

Clock InputIOutput

INTemal Input, disabled (OFF)
AM Input Disabled (OFF)
SUMBUS

OFF (not input or output)

TTL

Trigger Lines

OFF

(not input or output)

ECL Trigger Lines

OFF (not input or output)
Trigger Slope Positive
Trigger Source INTernal
Trigger Timer

1

ms

Trigger Count 1
Sweep Mode ContinuousRESet
Sweep

Start

value

1

kHz

Sweep Stop value100

kHz

Sweep Direction

UP

Sweep Spacing LINear
Sweep Time 1

s

Sweep Count

1

Sequence Advance AUTOmatic
Sequence Length

1

Sequence Dwell 1
Sequence Trigger EDGE

,

COAX

I

TERMINATION

RL=

Rs

R

L

SOURCE

MODULE

INSTRUMENT

"l-rRs

1

Figure

3-3.

Output

Termination

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8.8.4

IEEE-488.2

Common Commands

The

*

CAL?

self calibrate query, the

*

T ST?

self

test query, and the

*TRG

command are discussed

elsewhere in this manual (along with their equiva­lent

SCPI

query or command).

The

*CAL?

query is equivalent to the SCPI

CALi

-

brat

e

[

:

ALL]

?

query. The self calibration query
is discussed in Appendix A of this operator's man­ual.

The

*

T~T?

query is equivalent to the SCPI

TEST

[

:

ALL

I

?

query. The self calibration query is

discussed in Appendix

B

of this operator's manu-

al.
The

*TRG

is an IEEE Common Command used to

provide a properly sequenced trigger and execute

to an addressed IEEE-488.2 device. It triggers the
Model 1395 via the VXI data bus.

The previous paragraphs describe in detail the
three most commonly used IEEE Common Com­mands. Table 3-5 briefly describes the messages
mandated by the IEEE-488.2 standards, plus op­tional commands supported by the Model 1395.

Command

*CAL?
*CLS
*ESE
*ESE?
*ESR?

*IDN?

*OPC
*OPC?
*RCL
*RST

*

SAV

*

SRE

*

SRE?

*

STB?
*TRG
*TST?

*

WAI

Function

3.4

Model

1385

Operation

The following paragraphs describe messages for
various modes of operation for the Model

1395.

Standard Functions (CW)
Trace Operations and

USER

Function
Waveform Download Operations
Non-continuous Modes
Linked Sequence Operation
AMISCM Operation
SyncIPosition Markers
Internal Frequency Sweep
SUMBUS Operation
Clock Input/Output Operation
Intermodule Operations

Paragraph

3.4.4

Paragraph

3.4.5

Paragraph

3.4.6

Paragraph

3.4.7

Paragraph

3.4.8

Paragraph

3.4.9

Paragraph

3.4.10

Paragraph

3.4.1

1

Paragraph

3.4.12

Paragraph

3.4.13

Paragraph

3.4.14

Before beginning, review the data in paragraphs

3.4.1, 3.4.2, and 3.4.3.

8.4.1

Output

Trminations

Each output connector must be properly terminat­ed during its use to minimize signal reflection or
power loss due to an impedance mismatch. Figure

3-3 shows proper

5052

termination for the MAIN

Table

3-5

IEEE

488.2

Common Commands

Calibration Query
Clear Status Command

Standard Event Status Enable
Standard Event Status Enable Query
Standard Event Status Register Query
Identification Query
Operation Complete Command
Operation Complete Query
Recall Command
Reset Command

Save Command
Service Request Enable Command
Service Request Enable Query
Read Status Byte Query
Trigger Command

Self Test Query

Wait

-

to - Continue Command

Description

Starts self-cal, places passlfail response in output queue
Clears Status Data Registers, forces OCISIOQIS
Sets Event Status Enable Register bits
Returns contents of Event Status Enable Register
Returns contents of Event Status Register
Identifies devices over the system interface
Requires oper.

comp. message in Event Status Reg.

ASCII

'I'

in dev. out. queue when operations complete
Restores device setup from local memory
Resets the device
Stores current device setup to local memory
Sets Service Request Enable Register bits
Returns contents of Service Request Enable Register

Returns status and master summary status bytes
Initiates

a

properly sequenced trigger and execute
Starts self-test, places passlfail response in output queue
Blocks device commands until 'No-Op-Pend' flag is true

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....

&Waveform

Cycle-

+Waveform Cvcle-

--------------

SQUare

or

I

I

HFSQuare

j

1

I

,,,-Wavefofm Cycle:,

NHSine

I

I

Figure

3-5.

Continuous Waveform Characteristics

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Selection of the Haversine or Noise functions will

require selecting the "BBITs" rather than the
"ZCRoss" synchronization signal (see paragraph

3.4.10), as follows:

dev2:ibwrt "func phs;mark:sync:sour
bbit"

Reselect the sine wave when through observing
the Standard functions. Set the output signal's
Vpp amplitude and Vdc offset to the values for
this example by sending the following command:

dev2:ibwrt "volt 0.75;volt:offs

-

1.5"

This command sets the "amplitude" of the select-

ed trace to 0.75 Vp (1.5 Vpp) and the "dc offset" to

-1.5 Vdc. In reality, any points within the trace set
to the minimum value of

"OOlhex"

will be at -Vp

below the offset value; those set to "800hex" will be

at the offset value; and those set to

"FFFhexn will

be at

+Vp above the offset value. It is the combi-

nation of the amplitude/offset settings and the in-

stantaneous trace point value that determine the
output voltage.

Set the waveform frequency to 10 kHz with the

following command:

dev2: ibwrt "freq le4"

8.4.5

Trace

Operatlolls

wrd

USER

Functlon

(RllST)

The Trace Subsystem commands have been de­scribed in paragraph 3.3.3.9. The Trace Sub-

system is used to define, enter data into, and

manipulate arbitrary waveforms. Trace Opera-

tions are concerned with the management of the
1395's Trace Memory. Trace Memory is volatile,
high-speed RAM organized as 32,768 (optionally

131,072) addressable points.

3.4.5.1

Trace Definition

An arbitrary waveform is referred to in the SCPI
language as a Trace. A Trace is a block of contigu­ous points in the Trace Memory which are refer­enced by a <trace-name>. The "size" of the Trace

is the number of points reserved for waveform
data. Each data point uses 16 bits, with 12 bits
used to describe the "vertical" position of a point

(

a value of

"OOlhex"

will be at the lowest value; a

value of "800hex" will be at the median value; and

a value of "FFFhexU will be at the maximum value),
and the remaining four bits to be used as markers.

The previous paragraph introduced a special case
of the Trace, referred to as the Standard Function.
Standard Functions have neither their <shape­name>, their waveform data, their size, nor their
position in the Trace Memory arbitrarily assigned.
When the

FUNC t ion <shapeYname>

com­mand is processed, and the <shape-name> is one
of the

10

Standard Function reserved names, then
the appropriate waveform data is calculated and
placed in the final

4K

points of Trace Memory (un-

less Trace Memory has less than 4K unreserved
points remaining). For Standard Functions, the
TRACe MODE is set to CW (see Section

4

for

Phase Accumulator theory of operation) and

wave-

form frequency

is determined by the

[SOUR:

]

FREQ

[

:

cw

(

FIX]

<value>

com-

mand.

Traces defined under the Trace Subsystem and se-

lected for playback using the

FUNC

t

i

on USER

command are

arbitrary waveforms.

These Traces are
played back in the "Raster" (vs. phase accumula­tor) mode of waveform synthesis. In Raster Mode,
each point in the waveform is accessed sequential-

ly (by the sample time clock) and held for one

clock cycle. This assures that each data point val-

ue is accessed once each pass through the wave­form.

Raster Mode is selected with the

TRACE :MODE

RAST e

r

command and the

sample frequency

is set

with the

[

SOURce

:

I

FREQuency : RASTer

<value>

command. Trace frequency is then de­termined by dividing the Raster clock frequency
by the number of points in the Trace. Conversely,
the Trace period is determined by multiplying

sample time (time spent at each point is the in-

verse of sample frequency) by the number of

points in the Trace.

When the Model 1395 is powered on, the Trace

Memory is blank except for the default sine wave
created in the final 4K points. The Trace Mode is
CW (phase accumulate), the Function is

SINusoid,

the sample frequency is

50

MHz, the waveform

frequency is

1

kHz, the Sync Marker Source is
Zero CROSS, and the 20 MHz Elliptic Filter is on.
The Trace Memory is illustrated in the following
drawing:

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Example

2:

Set up the VXIbus system as described in Example

1.

Continue with commands in this example over
the next few paragraphs under the "Trace" head­ings.

The 1395's default configuration can be observed

by cycling power, setting up the Model 1395 and
an oscilloscope per Figure 3-4, and then sending
the following:

:ibf ind gpibO

dev2:ibwrt

"outp 0n;mark:sync on"

In this paragraph new Traces will be Defined,
which gives them a name and reserves a block of
points in Trace Memory according to the new
Trace's size. When the first Trace is defined, it

goes to the start of Trace Memory (from memory

address

0 to memory address

size

-

1).

The next

Trace defined will be placed directly after the first

TRACE, and so on such that

used

memory is al-

ways contiguous from the start of memory and

free

memory is contiguous from the end of the last
Trace to the end of available memory. This way,
the Standard Functions are always available (using
the last 4K of free memory) until there is less than
4K of memory remaining. The Model 1395 firm­ware manages the start and stop addresses of each
Trace so that this simple model is maintained,
even as Traces are deleted or re-sized in subse­quent Trace Subsystem operations.

Trace names have a maximum length of 12 charac­ters. The names cannot be the names of Standard

Functions, as these are

reserved names.

Trace
names must start with an Alpha character and may
be composed of either upper-case or lower-case
characters. The only other characters permitted

are the numerals (0-9) and the underscore

(-)

char­acter. No short-form of the Trace name is permit­ted. The Trace Directory can hold up to 50 Trace
names, although new Traces cannot be defined
once the Trace Memory is filled.

The command to define a new Trace has two
forms:

.

The first command can be used to define a new
Trace <lst-name>, and at the same time copy the
data from the Trace or Standard Function

<2nd_name> to the new Trace. The new Trace will
be defined using the size of the Trace
<2nd_name>.

If

<2nd_name> is the name of a
Standard Function, the new Trace will be created
with a default size of 8K (8192 points).

The second form of the command creates a new
Trace with the given name and size. This Trace
will not yet have any waveform data. The Trace
Memory has default data values of 2048 (800 in
hexadecimal), which is half-scale (zero ampli­tude).

Using the first form of the Trace Define command,
the

SINusoid Standard Function can be used as a
source of data to create the Trace "SIN1" in the fol­lowing manner:

Use the following commands to observe this new­ly created Trace:

dev2:ibwrt

"func

user"

The Model 1395 will make several other program­ming changes automatically because of the shift

from a Standard to a User Function. The Trace
Mode will shift from

CW

to Raster, the Sync
Source will shift from ZCRoss to BBITs, and the
Filter will turn off (Filter Select remains Elliptic).
The Raster (sample clock) frequency will be at its
default value of 50 MHz, so the SIN1 output fre­quency will be 50 MHz divided by 8192 or 6.104
kHz. Verify that the oscilloscope indicates the
change to an approximate

6

kHz (-160 ps) sine
wave and that the sync signal uses BBITs. Then
send the Trace Directory query:

dev2:ibwrt "trac dir?"
dev2: ibrd 20

The response should be"s1~1, 8192,

0,

8191".

This response is interpreted to mean that there is

one Trace in memory with the name "SINl", with

a size of 8192 points, a

start address

of 0 and a

stop

address

of 8191. The true start and stop address
are managed by the instrument firmware, and may
not be viewed by the user/programmer. From the
user's point of view, it is best to consider each
Trace to have a

relative

start address of 0 and a

rel-

ative

stop address of (size -1). Within this relative
address range, segments of the Trace may be se­lected for various operations using the Trace Lim­its (see paragraph 3.4.5.4).

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The second form of the Trace Define command can
now be used to set up the Traces which will be
used in the remainder of this operational descrip­tion, as follows:

dev2:

ibwrt

'trac:def
valve3,4000;def exp2,3000;def
heartbeat2,4000n

Verify that the Trace Memory looks like the fol­lowing figure by sending the

TRAC

:

CAT?

query
and verifying that the response message is the
names of the four traces.

3.4.5.2

Trace

Data

Note that three of the four Traces in the above fig­ure have a name and address space reserved for
them, but the waveform data at each point is sim­ply the default half-scale value. This paragraph is
concerned with a few of the methods for getting
data into the defined traces using the Trace Data
commands. These methods may be characterized
as "pre-defined", "user-defined", and "Block
Download" (see paragraph 3.4.6).

"Pre-defined" data entry involves the Standard
Functions. This is often a convenient starting
point from which the user can make alterations.
In the previous paragraph the

SIN1 waveform was

both defined and loaded with an

8K

point SINuso­id using the Trace Define command and the de­fault size. VALVE3 was defined with a size of
3000 points. This Trace can be given "square
wave" data with the command:

The second command selects the USER waveform
as VALVE3 for viewing on the oscilloscope. The
square wave represents the simplest

on/off repre­sentation of a valve control signal. The waveform
could be given greater complexity through subse­quent Trace Data operations, such as Point and

Line editing.
Point editing is far too tedious for editing more

than a few points, but occasionally it is the only
way to get exactly the desired results. For exam-

ple, the rising edge of the VALVE3 waveform
could be "softened" on a point-by-point basis
without attempting to define the transition with
an expression. Make sure the oscilloscope is exter­nally triggered on the positive-going slope of the
BBITs synchronization signal and set the horizon­tal sweep time to 50

ns/DIV to observe the
VALVE3 rising transition. Send the following
point data:

dev2:ibwrt "trac:data:poin valve3,

0,1000;poin valve3,1,2000;poin
valve3,2,3000;poin valve3,3,3500;
poin

valve3,4,4000;mark:sync:sour

zcr;sour bbit"
The first five sub-commands send the data point-

by-point, and the last two sub-commands toggle
the synchronization "source" from BBITs to

ZCRoss and back to BBITs. This restores the BBITs

signal which is lost when relative address zero is

written into.

Line editing is the second form that the Trace Data

command can take. VALVE3 can be used to dem-

onstrate line editing. Make sure the oscilloscope

is externally triggered on the positive-going slope
of the BBITs synchronization signal and set the
horizontal sweep time to 10 ps/DIV to observe the

VALVE3 falling transition at approximately four

divisions. Since VALVE3 was originally defined as
a 4000 point square wave, the first 2000 points
should have had the data value of

"4095" and the

last 2000 points should have the data value of

"1".

Modify the falling transition with a line segment
by sending the following:

The edited VALVE3 waveform should now appear
in Trace Memory as follows:

Block editing is the third and final form that the
Trace Data command can take. The Block data is
in the form of an IEEE-488.2 Definite Length Arbi­trary

Block

Transfer from a computer. Refer to

paragraph 3.4.6 for data on the block transfer.

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3.4.5.3

Trace

Copy,

Resize, Rename, and Delete

The SINl and VALVE3 examples demonstrate
Copying a Standard Function to a new Trace. This
same process can also Copy an existing USER
Function to a new Trace. The destination Trace

must be first defined so that it has a name and a

size. The destination Trace size may be smaller,
equal to, or larger than the source Trace. The
Model 1395 uses linear interpolation to remap the

data from a source Trace to a destination Trace
with a differing size. The interpolation routine at-

tempts to maintain waveshape integrity as much

as possible. Copy the 8K

SINl's data to fill the 3K

User waveform EXP2 using the following com­mand:

dev2:

ibwrt

"trac [ :data] exp2, sinl"

This maps the 8K data points into a smaller 3K

waveform. View EXP2 with the command:

Verify that the EXP2 waveform now appears in

Trace Memory per the following drawing:

Waveform Re-sizing is accomplished by using the
TRACe POINts (not to be confused with the Trace
Data Point) command to specify a different num­ber of points in a given Trace. View SINl with the

FUNC

:

USER

S

IN1

command. With the oscillo­scope horizontal trace set to 20 ps/DIV, the wave­form will be approximately eight divisions long.
Resize SINl from 8192 points to 5120 points, as
follows:

Verify that SINl is now approximately five divi-

sions long. The Trace Memory should now be as
follows:

SINl can be renamed EXPl by first Copying it to

the new Trace

EXPl and by Deleting SIN1. This is

accomplished as follows:

dev2:ibwrt

"trac:def exp1,sinl;del

sin1;:func:user expl"

The oscilloscope display will be unchanged after

the above steps because the new

"EXPI" is identi­cal to the old "SINl". However, either a CATalog
or DIRectory query would verify that'the Trace

Memory is now organized as follows:

Note that the Model 1395 manages the start and
stop addresses of the Traces by "filling in" any
free address space created by deleting or downsiz­ing Traces. Traces will always occupy contiguous
address space starting at the beginning of the
Trace Memory.

3.4.5.4

Trace

Limits

Recall that each Trace in Trace Memory can be

thought of as a block of points with a relative start

address of zero and a relative stop address of (size

-

1). (The reference data in this manual often re­fers to "addresses" as "trace point indices"). The
Limits command allows the user to select a

seg-

ment

within a Trace using this relative addressing.
Subsequent Trace Subsystem operations on this
Trace then apply to the selected segment and not
the entire Trace.

NOTE

The Trace Delete command is an exception, it
deletes the entire Trace, not just the selected
segment. The start and stop Limits must be
included in the range of zero to (size

-

I),

and
the stop Limit must be at least five points
greater than the start Limit. When a new

Trace is Defined, the start and stop Limits de-

fault to zero and (size

-

1).

As an example, Trace Limits can be used to create
a HEARTBEAT2 waveform a segment at a time.
This way more complex Traces can be created with

the Model 1395's simple waveform editing capa­bility. Select a segment within the HEARTBEAT2
waveform and view it as follows:

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Simulate the Q-R-S Wave portion of a PQRST
heartbeat signal using the Positive Haversine:

View the entire waveform by resetting the Limits:

Note that the Haversine was written into only the
selected segment, and the remainder of the Trace
is still at the default half-scale value. Complete
the heartbeat waveform with line segments, as fol-

lows:

dev2:ibwrt "trac:line heartbeat2,
800,2048,1000,2248;1ine heartbeat2,

1000,2248,1400,1600;line

heart-

beat2,

1400,1600,1600,2048;line

heartbeat2,

2800,2048,3000,2248;line

heart-

beat2, 3000,2248,3200,2048"

The resulting waveform should be a reasonable
fascimile of a train of heartbeat pulses when

viewed at a slower oscilloscope sweep setting.
The Trace Memory should now be configured as

follows:

The current Trace Limit settings of all waveforms

in Trace Memory can be obtained in one single
query using the

TRAC

:

DIR?

query.

3.4.5.5

Trace

Queries

Most commands have a query form which can be

sent by adding a question mark

(?)

directly after
the Program Header. This will cause a response
indicating the current setting of the parameter.
The Trace Subsystem has three key words which
have only a query form. These are intended to
provide detailed information on the Traces in
Trace Memory. Using the figure in the previous
paragraph, each of these queries can be demon­strated.

Definite Length Arbitrary Block Data Format

non-zero high byte

+

lowbyte

ASCII

digit

(binary) (binary)

number of byte count:

digits in byte count 2

x

number of
points

2 bytes per point

(see format below)

C

high

byte

+

+

low byte

+

markers:

each point is

12-bit

binary value

(0

to

4096

decimal)

8

-

sync

marker

7 - postion

marker

6

-trigger rnarker

5

-

2-Axis

rnarker

Figure

3-6.

Definite Length Arbitrary

Block

Data Format

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The

TRACe : CATal

og ? query returns the names
of each user-defined Trace in sequence. The re­sponse for the above figure would be:

dev2:

ibrd 50

"valve3,exp2,heartbeat2,

expl"

The

TRACe : DIRec t

ory?

query returns the

names, sizes, and limit settings of each Trace

in

se-

quence. The response for the above figure would

be:

The

TRACe

:

FREE?

query returns the number of
points of Trace Memory in use and the amount
free. For a Trace Memory size of 32K, the response
for the above figure would be:

"16648,16120"

8.4.6

Waveform Download Operations

These operations are used to get large amounts of
waveform data into or back from Trace Memory,
using the host computer. This is the only practical
way to work with complex waveforms. Data is
entered into the Model 1395's Trace Memory as a
"block" of data using the

TRACe

[

:

DATA]

itrace-name>,

<block>

command. A block

of data can be read back to the computer using the

TRACe

[

:

DATA]

?

<

trace-name>

query. In

both cases, the

IEEE-488.2 Definite Length Arbitrary

Block Data format

is used (see the next paragraph).
The size of the "block" is determined by the cur­rent Trace Limits settings for the Trace using the

<trace-name> specified. The Limits commands
can be used to divide a large Trace into manage­able blocks of data.

3.4.6.1

Definite Length Arbitrary

Block

Transfer

This format for block data transfer makes it possi-

ble to rapidly move the large amount of data re-

quired for arbitrary waveforms. Refer to Figure

3-6 for the following discussion.

To send a'block of waveform data, send an ASCII

"#"

($23), then an ASCII encoded digit whose val­ue signifies the number of digits in the byte count,
then ASCII encoded

digit(s) representing the byte

count, then the two byte binary data words (MSB

first).

The byte count is twice the number of points to be
downloaded to the trace. The byte count must

ex-

actly correspond to the number of bytes in the
block of data.

Each data word is composed of two bytes repre­senting

a

12-bit unsigned integer between 0 and

4095. The remaining four most significant bits are
normally set to zeros, but they may also be set to
provide the various waveform markers at specific
"relative addresses" within the Trace. As shown
in Figure 3-6, the four markers have the following
definitions:

Z-AXIS Not used in the Model 1395, the

fourth-most significant bit (bit 12 of a 16­bit word) line is reserved for "Z-Axis" or
horizontal intensity modulation of an os­cilloscope display. This bit could be set at
a particular point within a Trace by adding
the value "4096" to the 12-bit data value at
that point.

TRIGGER The third-most significant bit (bit

13 of a 16-bit word) line is reserved for an
internal triggering signal used for inter­module triggering (see paragraph 3.4.14).
This bit could be set at

a

particular point
within a Trace by adding the value "8192"
to the 12-bit data value at that point.

POSITION The second-most significant bit

(bit 14 of a 16-bit word) line is reserved for
an internal signal used to drive the MARK-

ER

POSN output. This bit could be set at a

particular point within a Trace by adding

the value "16384" to the 12-bit data value
at that point.

SYNC

The most significant bit (bit 15 of a 16-

bit word) line is reserved for an internal

signal used to drive the MARKER SYNC/
H-SWP output. This bit could be set at a
particular point within a Trace by adding
the value

"32768" to the 12-bit data value

at that point.

NOTE

Although the programmer/user may set mark­ers within a Trace at the time that data

is

cre­ated for the block transfer, this action is not
always necessary. The markers can be created

by the Model

1395

with the appropriate

SCPI

commands at the time of their application.

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NOTE

For example, a Trace with data supplied by a
block transfer using 12-bit data values and no
markers will not have

a

BBITs

synchronization
signal when first "played back". However, the
operator can cause the

1395

to create these
sync signals by simply programming the Sync
Source to ZCRoss and then back to BBITs.

Prior to downloading a waveform using the

TRACe [:DATA] <trace-name>,<block>

command, the Trace must be Defined. Send the

TRACe:DEFine <trace-name>,<size>

command to define a Trace of "size" points under
the trace name. This also presets the Trace Limits
for this trace at full size.

You may select a segment of this trace for down­load (or subsequently, for upload) using the

TRACe:LIMits <trace-name>,<start-

index>, <stop index>

command.

NOTE

When the block size exceeds the capability of

your download/upload application, you may

use the Tl2ACe:LIMits feature to break the

block

up

into manageable segments.

The "binary" transfer occurs at a relatively high
speed because the binary data is not parsed
through the 1395's Command Processor. Instead,
the data is routed directly to the Trace Memory
RAM without processing or limit checking, much
like a direct memory access (DMA).

If the waveform limits (size), the byte count or the
number of bytes in the <block> are not all in nu­meric agreement, or one half second elapses with­out receiving any data, the high speed transfer
will be aborted. Any data received after this will
be interpreted by the Command Processor as
ASCII characters and will cause the Model 1395 to
generate many errors.

Several examples of programs written in
WaveTestTM BASIC are given in Appendix

E

of this
manual. These programs create data for a Trace
and download the data using the block transfer

format.

3.4.6.2

WaveForm DSPTM Download

WaveForm DSPTM is a Wavetek software product

running under Windows which creates arbitrary
waveform data files and downloads them to
Wavetek ARBs using the GPIB or VXIbus interfac­es. The WaveForm manual is very extensive, and
should be used for proper set up of the GPIB inter­face and the Model 1395. The first two sections of
the WaveForm manual are most important to the
first time user. The following topics provide addi­tional information relative to the Model 1395 and
VXIbus

ARBs in general.

GPIB

Addressing

At the time that this manual was written,
WaveForm was at revision level 1.11. This revi­sion supports an IBM compatible PC operating as
GPIB controller to "stand-alone" GPIB instru­ments and as "external host" to a VXIbus system.

The host requires a GPIB card and driver software.
WaveForm supports GPIB cards using National In-

struments drivers (the AT-GPIB and PCII/PCIIA

cards) and GPIB cards which are "NEC 7210 com-

patible" (National's PC11 and PCIIB cards, and I/
Otech's

488-8 and 488-Bplus cards). The "slot 0"
or Resource Manager (RM) card inside the VXIbus
chassis is not a stand-alone computer, but a GPIB
bus to VXIbus translator, and the external host
runs the control application. Examples of RM
cards include the National Instruments GPIB-VXI
and the Wavetek 1320.

In this "external host" configuration (see Figure

3-

7),

the programmer/operator needs to be aware of
three levels of GPIB addressing; the GPIB card, the
RM, and the ARB module (Servant).

At the card level, the computer's Base 1/0 Ad­dress, Interrupt (IRQ), and DMA Channel settings
have to made for each particular card. Additional­ly, there can be one or two of the same type cards
installed (primary and secondary). Section 1 of
the WaveForm manual provides the needed infor­mation to set the cards and store the settings in
the GPIB information file.

Once this process is completed, the WaveForm
user needs only to select primary (GPIBO) or sec­ondary

(GPIB1) cards at the time

of

download.

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The remaining

GPIB

addresses to be set are the

RM (primary address) and the

ARB

module (sec­ondary address). The addresses are set by select­ing switch settings on the VXIbus modules (see
section

2

of this manual for setting the Model

1395's module address). The primary and second-

ary addresses are treated together as

device infor-

mation

(dev<n> where "n"

is

1

to

16

for the
primary card and 17 through 32 for the secondary
card). Each instrument or module to be controlled
over the GPIB should have a

device

assigned to it.
The programmerloperator goes through the pro­cess of setting primary, and if applicable second-

ary, addresses and storing them for each device.

Once completed, the instrument can be addressed

simply by calling its device. This process is also
detailed in section

1

of the WaveForm manual.
Once completed, the WaveForm user needs only to
select the correct "dev<n>" at the time of down­load.

NOTE

The Model 1395 supports both Static (switch
settings) and Dynamic Configuration

(DC)

of

the seconda

y

address. To use the 1395 with

WaveForm over the

GPIB

it is best to use Stat-

ic switch settings so that the 1395's address is

fixed and will agree with its

dev<n> assign-

ment, even

if

the modules are moved around

inside the chassis.

For the First-Time WaveForm User

Once all of the preparation described in the previ­ous paragraph is completed, the user should go
through the following steps to verify communica­tion between the WaveForm application and the
Model 1395.

Cycle power to the Model

1395.

(Alternative-

ly, send the

*

c L s

command to flush any er-

rors out of the SYSTem:ERRor queue.)

WaveForm checks for errors after each com-

mand sent and displays them in a dialog box.
The error queue can contain up to

8

error mes­sages which have accumulated since the mod­ule was powered on.

Start WaveForm. Press "OK" as the start-up

dialogs are displayed.

Select "Open" from under the "File" menu.

Open the file "demo.wfmfl.

A

"(sin

x)/x"

waveform will appear in the top window.

Select "Select Download.

.

."

from under the

"Options" menu.

A

dialog box appears to
make control selections to download the wave­form to the Model 1395.

From under the "Model:" selection box, select
"Model

1395-32K", or "Model 1395-128K" if

the expanded memory option is installed.

1320

with GPIB

Primary Address Secondary Addresses

1

Additional GPlB or VXI

lnstmmentation

Figure

3-7.

VXIbus System Using "External Host" GPIB Controller

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The "Destination:" selection will default to
"GPIBO". This is the most common selection,
unless there is a second

GPIB

card installed
and the Model 1395 device number is under
the secondary card.

In the "Device Address" box, modify the de­fault "DEV9" to "DEVn", where "nu is the de­vice which has been preprogrammed for the
RM's primary address and the Model 1395's
secondary address.

The "Size" setting should be defaulted to
"1024", the size of the selected (sin x)/x wave­form. This size may be edited to any number
of points from 8 to 32K (128K), but if it is
changed, the "Mode:" should be changed from

"Point to Point" to "Stretch to Fit".

NOTE

The Trace created

by

WaveForm DSPTM for
downloading to a SCPI instrument has the
name "WAVEFORM". This is not user

edit-

able. The "preamble" string sent prior to the

binary data first DELetes the Trace with the
name WAVEFORM and then DEFines it again
with a size equal to the "Size" setting from the

"Setup Download.

. ."

dialog. Therefore, it is
best to avoid using the Trace name of WAVE­FORM ifalso using WaveForm DSPTM with a
SCPl instrument.

Save this download setup by pressing "OK" to
accept these settings and then select "Save Set­up" from under the "Options" menu.

10. Set up the 1395 and an oscilloscope according
to Figure 3-4. Select "Exec Download" from

under the

"I/O" menu. The waveform should
appear on the oscilloscope at WaveForm's de­fault settings of

1

kHz waveform frequency (if
changes were not made to the "Setup Wave­forms.

.

."

dialog and if "Size" was not

changed from 1024 points) and

1

V peak (into

5052) amplitude.

Follow the tutorials in the WaveForm DSP manual
to create and download waveforms to the Model
1395 using the control settings to vary the wave­form's parameters.

WaveForm DSP Download

File

Structure

The file structure, although transparent to the
user, is an ASCII "preamble" of SCPI commands to

set up the Trace parameters, a data transfer in Def­inite Length Arbitrary Block Data format, and a

"postamble" of more

SCPI

commands if specified

by the user. WaveForm uses a data block size of

1024 points, and the Trace Limits command is

used to break up long waveforms into

1K

blocks.

3.4.6.3

Shared Memory Transfer

The Model 1395's VXIbus Interface card contains

64

kB of "A24" Shared Memory. Shared Memory

can be used by VXIbus modules to transfer large

amounts of data quickly and efficiently without
using Word Serial Protocol. See the VXIbus Speci­fication for details on the VXIbus Shared Memory.

Although the Model 1395 does not support the
Shared Memory Protocol, its Shared Memory can
be used by the Commander and other instruments
which do. In this case, the issue of interest to the
Model 1395 would be creating

a

mechanism to
download waveform data from Shared Memory to
Trace Memory.

The mechanism for transfer from Shared Memory
to Trace Memory is the pseudo-standard function
SMEMory (see [SOUR:

I

FUNC<shape name>).
The SMEM function serves to operate as a possible
source of data to be used with the

TRAC

[

:

DATA]

<trace name>,itrace-name> command.

When this form of the Trace Data command is

used, the first trace name is the name of the Trace

which is to receive the data. The second trace

name is the Trace which is to be the source of the
data. Data is copied from the source Trace to the
destination Trace. The data is

resized if necessary
to the number of points set by the Trace Limits set­tings of the destination

race.

The source Trace can be a Trace in Trace Memory

or a Standard Function. When a Standard Func­tion is used, the data is calculated according the
function's shape and the destination Trace's size.
The exception is the SMEMory Standard Function.
When the source trace is the SMEM function, data
is copied from Shared Memory to the destination
Trace.

It takes two bytes from Shared Memory to make

up one 16-bit waveform point (or word). A single

data point is defined in Figure 3-6 and paragraph

3.4.6.1. The Shared Memory transfer does not use
the ASCII header of the Definite Length Arbitrary
Block Data format, but the binary data is the same
(use Motorola byte order). Refer to Figure 3-6 and
paragraph 3.4.6.1 for detailed information on the
binary data word.

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When the destination Trace is defined, it is given
both a name and a size. At this time the Trace

Limits settings include the full Trace. If the Trace
Limits are reset to select a segment within the
Trace then the Trace has a new size equal to (stop
limit

-

start limit + 1).

The current Trace size is the number of points in
the selected Trace or Trace segment, and it deter­mines how many bytes of data are copied from

Shared Memory. Since it takes two bytes to make
a word, Shared Memory is copied starting at its
A24 base address and sequentially up to the base
address plus

twice

the value (size - 1). The Trace
size can range from 8 to 32K points (128K points
with the Option).

A

64 kByte Shared Memory can contain a maxi­mum of 32K data points. If the Trace has a size
greater than 32K points, the Trace Limits can be
used to break the waveform up into 32K blocks,
and then use multiple downloads to build the
waveform up in segments.

Appendix

E

of this manual provides an example
"C" program written for the RadiSys EPC-2 Em­bedded Controller which writes a ramp pattern
into the 1395's Shared Memory and then transfers
it to the 1395's Trace Memory under the name of
"test".

The Mode of waveform generation is

CONTinuous

as long as the default setting

1NITiate:CONTinuous ON

isnotchanged.
Continuous Mode causes the Model 1395 to output
the selected Trace continuously. Changing this
setting to

OFF

sets the Model 1395 to a non-con­tinuous modes of operation. There are two non­continuous modes, Triggered and Gated. The

default setting of the command

TRIGger :GATE

[

:

STATe]

OFF

determines
that the unit will be in Triggered Mode until the
command is sent to turn Gated Mode on.

EXTERNAL TRIGGER
POSITIVE SLOPE

FIXED TRIGGER

LEVEL

-i;

/\

EXTERhUL TRIGGER

I

NEGATIVE SLOPE

SINE
BASELINE

SQUARE OR

HF

SQUARE BASELINE

I

NEGATIVE

FiAMP

I

I

BASELINE

I

I

I
I

I
I POSITIVE

HAVERSINE

,-

MSWNE

NEGATIVE
HAVERSINE
BASELINE

BBlT SYW

OUT

Figure

3-8.

Triggered Waveform Characteristics, Count

=

1

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3.4.7.1

Triggered Operation

In the triggered mode, the Model 1395's output re­mains quiescent (at a dc level) until triggered by
the selected trigger source. All Model 1395 func­tions may be triggered. When triggered, the Mod­el 1395 produces one complete Trace, then returns
to the quiescent state at the level of the first point
in the Trace. See figure

3-8

for the triggered wave­form characteristics of the various functions. The
following Examples describe how the Model re­ceives a valid

triggering event

by using the INTer­nal trigger timer, the external TRIG IN, the trigger
command, one of the eight TTLTrgcn> VXIbus
trigger line, or the CHAin or ECHain signals on
the VXIbus Local Bus (paragraph 3.4.14.1).

To set the Model 1395 for the triggered mode, fol­low the instructions in the following example:

Example

3:

Refer to "Example

1"

for general information re­garding the use of National Instrument's WIBIC
application for GPIB control of VXIbus instru-

ments. The following discussion provides a com-

plete example for powering up the Model 1395 in
its default settings and then modifying those set­tings to demonstrate a triggered output. In the
following programming steps, the information in

bold

is the WIBIC prompt. The remainder of the
string is to be typed in by the programmer. This
example will continue through all of the para­graphs under "Non-Continuous Modes".

The first line identifies the GPIB card. The second
line identifies the Model 1395 UUT. The third line
sets the

UUT's output on and turns on the SYNC

OUT. The fourth line changes the sine wave's

1

kHz

default frequency to 10

kHz

and changes the
synchronization signal from ZCRoss to BBITs. The
fifth line changes the generator Mode from Con­tinuous to Triggered.

:ibf ind gpibO

dev2:ibwrt "outp 0n;:mark:sync on"
dev2:ibwrt "freq le4;mark:sync:sour

bbit"
dev2:ibwrt 'init:cont off"

A 0.1 ms SINusoid waveform cycle should appear
once every

1

ms, with a dc baseline between cy-

cles.

Internal Trigger

The trigger slope parameter

(TRIG

:

POL

<

POS

I

NEG>)

has no effect on an internal trigger source,

but the remaining Trigger Subsystem commands

will effect the internally triggered output. To trig­ger the generator internally, set up the internal
trigger frequency to a value lower than the func­tion generator

(CW)

frequency. Set up the genera-

tor as in the Continuous example:

dev2:ibwrt "outp 0n;mark:sync

onn

dev2:ibwrt "freq le4;volt

0.75;

vo1t:OFFS -1.5;:init:cont off"

The result will be a 0.1 rnsJ.5 Vpp (into 50R) sine
wave riding on a dc baseline level of -1.5V, trig­gered at a

1

kHz

rate. The SINusoid function, the

INTernal Trigger Source, and the

1

ms Trigger
Timer setting are all default settings. Change each
of these settings as follows:

dev2:ibwrt "trig:sour ext"

The triggered waveform disappears, leaving the

-

1.5 Vdc baseline.

Then set the following:

dev2:ibwrt 'trig:sour int;tim

2e-

3;:

func tri"

The triggered function is now the TRIangle, and
the trigger time is increased to

2

ms. Note that the
trigger baseline is at the negative peak of this
waveform.

External Trigger Input

In external trigger, the Trigger Timer setting will

have no effect on the triggered waveform. The

trigger slope determines whether the instrument
triggers on the positive- or negative-going portion
of the input signal.

First perform the steps in the previous paragraph.
Next, select the external trigger input by sending
the command:

The oscilloscope should show a dc baseline at the
previously noted level. Prepare to connect an ex­ternal signal to the TRIG IN connector to trigger
the 1395. To trigger on the positive-going trigger
slope (rising edge), send the command:

dev2:ibwrt "trig:slop pos"

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To trigger on the negative-going trigger slope
(falling edge), send the command:

dev2:ibwrt "trig:slop neg"

The maximum specified trigger rate is 5 MHz.
The minimum specified pulse width is 20 ns. The
trigger threshold

(2

kR

input) is a fixed value of

approximately +1.2 V for TTL signal level compat­ibility. Select a signal source which can provide a

TTL square wave with

a

frequency up to

5

MHz.

Set the external generator for approximately

1

kHz. Connect the external TTL signal to the Mod-

el 1395's TRIG

IN

BNC. Verify that the triggered

TRIangle function returns.

VXlbus

TTL

Trigger Lines Input

The Model 1395 may also be triggered from the
VXIbus TTL Trigger lines. The triggering signal
must be placed on the selected TTLTrigger line
from another source within the VXIbus chassis.

The following commands provide a complete ex­ample for one module triggering another module
using a

TTLTrigger line.

The first line resets the UUT. The second line sets
the UUT's output on and turns on the SYNC OUT.
The third line causes the 10

kHz

sine wave to be

internally triggered at a

1

kHz

rate. The fourth
line selects TTLTrgcO> as the trigger source, and
the output goes quiescent. The fifth 1ine.identifies
the external source in slot

1.

The sixth line causes
the external source to drive TTLTrg<O> with a sig­nal at its

1

kHz

default frequency.

dev2:ibwrt "res"
dev2:ibwrt "outp 0n;:rnark:sync on"

dev2:ibwrt "freq le4;mark:sync:sour
bbit;:init:cont off"

dev2:ibfind devl
dev1:ibwrt "outp:ttltO on"
devl

:ibfind dev2

I

Y

EXTERNAL TRIGGER
POSITIVE SLOPE

nxa,

TRIGGER

EXTERNAL TRIGGER
NEGATIVE SLOPE

-hA-

TRIGGERED TRIANGLE; COUNT

=

1

-l--t-

BBlT SYNC OUT

TRIGGERED TRIANGLE; COUNT

=

5

i--Lc-

BBlT SYNC OUT

GATED TRIANGLE; COUNT

=

NIA

Figure

3-9.

GateIBurst Waveform Characteristics

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Trigger

COUNt Command

The Trigger Count command allows the operator
to select a number of cycles that are generated fol­lowing each trigger event. When in Triggered
Mode (both

INIT : CONT

and

TRIG : GATE

[

:

STAT]

are

OFF),

and the COUNt

is at its default value of

"l",

single cycle wave­form triggering as shown in Figure 3-8 occurs.
However, setting the COUNt to a higher value,
such as "5" shown in Figure 3-9, the Model 1395
operates as a burst generator. The trigger COUNt
is programmable up to 1,048,575 for Traces and up
to 524,288 for segments of a Sequence (see para­graph 3.4.8). To view triggered operation with
COUNt set to >1, continue with the sequence of
commands from Example 3, as follows:

Connect the external signal source (1 kHz

TTL
square) back to the Model 1395's TRIG IN. Verify
that the triangle and BBITs sync waveforms corre­spond with Figure 3-9 for "COUNt

=

1". Send the

following:

Verify that the triangle and BBITs sync waveforms
correspond

with

Figure 3-9 for "COUNt

=

5".

IEEE-488

and VXlbus

Trigger

Commands

To trigger the generator using the IEEE 488 bus or
the VXIbus, set up the generator to follow on with
Example 3 from the previous paragraph. Trigger
the generator by sending either the 488.2

*TRG

or

488.1

GET

command over the 488 bus, or the word

serial

TRIGger

over the VXIbus. The

*TRG

command is mandated to be recognized by the
Model 1395. The

GET

command causes the Com-

mander to send the VXIbus word Serial

TRI Gge

r

command to addressed devices which support

TRIGger

and do not have their DIR bit cleared to

0

(see VXIbus System Specification). Trigger slope
does not apply when using these as the trigger
source, and the bus commands

only have effect

when the Model 1395 is in a triggered mode of op-

eration.
Proceed with Example 3 by first removing the ex-

ternal signal from the Model 1395's TRIG IN. In­crease the trigger count so that a single burst can
be seen and then send the following commands to
trigger the generator:

dev2:

ibwrt

"trig"

LOOP

CONDITIONS

TRIG

VANCE

1

ADVANCE CONDITIONS

Figure

3-10.

CONTinuous Sequence State Diagram

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Set the 1395 back to external triggering by sending
the command:

dev2: ibwrt "trig:coun

defn

dev2:ibwrt "trig:sour ext"

Reconnect the external signal at the TRIG IN con­nector and verify the triggered operation with
COUNt

=

1.

3.4.7.2 Gated Operation

Gated operation is identical to the triggered oper­ation, except the output from the Model 1395
starts from the quiescent state, produces continu­ous waveforms for the duration of the trigger sig­nal, then returns to the quiescent state. All
waveforms may be gated.

To view gated operation, set up the Model 1395
per Example 3 and the previous paragraph.
Switch from triggered to gated operation with the
following command:

dev2:ibwrt "trig:gate on"

Vary the frequency of the external TTL square
wave and verify that the gated waveform is "on"
half the time (plus the completion of the last cycle)
and "off" half the time.

8.4.8

Sequence

Operation

Refer to the SCPI command reference information
given in paragraph 3.3.3.5 under
"[SOURce:]SEQuence.

.

."

for detailed command

information.

A

sequence is a means of adding
more capability to the Model 1395 ARB to accom­plish even more complex tasks. A Sequence links
together from two to four waveforms, as shown in
Figure 3-10. A State Diagram best displays the
logic involved in setting up a Sequence using the

1395. Traces stored in Trace Memory are linked to­gether as waveform

segments

in the Sequence.

Each segment can be repeated a number of times
depending upon its Loop Count setting. When the
Loop Condition is met by completing the Loop
Count, the Sequence advances to the next segment
according to the Advance Condition. Sequences
can be run in both the CONTinuous and the

TRIG-

gered Mode. When in CONTinuous, the Sequence

is always restarted when the final segment's Loop
and Advance Conditions are met.

When in TRIGgered, the Sequence is restarted un­der the same conditions that single waveforms are
triggered (see paragraph 3.4.7). Paragraphs 3.4.8.1
and 3.4.8.2 give a tutorial on using Sequences in

CONTinuous and

TRIGgered Modes.

3.4.8.1 CONTinuous Sequencing

Refer to Figure 3-10 and the following discussions
for CONTinuous waveform Sequencing.

Create Waveforms for a Sequence

In this tutorial a sine wave, a triangle wave, and a
negative-going ramp will be created and assigned
as Segment 1, Segment

2,

and Segment 3 in a Se­quence corresponding to Figure 3-10. Then the
segment Loop and Advance Conditions will be set
up according to the figure and it will be "played
back" in CONTinuous mode. The SCPI commands

to accomplish this are given in "Example

4",

which follows this paragraph and continues on as

a tutorial throughout all discussions on Sequenc­ing.

Example

4

Refer to "Example

1"

for general information re­garding the use of National Instrument's WIBIC
application for GPIB control of VXIbus instru­ments.

Set up the Model 1395 in its default states by send-

ing the following:

:ibf ind gpibO

dev2:ibwrt "res"
dev2:ibwrt "outp 0n;:mark:sync on"

Create the 3 waveform segments as follows:

The waveforms can be verified by playing each
one back:

dev2:ibwrt 'func:user segl"
dev2:ibwrt "func user"

dev2: ibwrt "func :user seg3

"

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Create the Sequence

First define the Sequence length (the number of
segments in the Sequence, from

2

to

4).

Use a

length of 3 per Figure 3-10 for this tutorial:

This sets the segment index to a range of "0" to

"2".

Then assign an index number to the 3 seg-

ments:

Set Up the Sequence Loop and Advance Conditions

The Loop Count (DWELI) is programmable from

1

to 65,535 repetitions on each segment, or as "con-

tinuous". Continuous looping is set by program-

ming the Loop Count to

"0". Using Figure 3-10 as

a guide, program the following:

dev2:ibwrt "seq:dwel 5,O;dwel 0,l;

dwel

3,2"

This sets "SEGI", the segment assigned to index

1,
to loop 5 times; "SEG2" to loop continuously; and
"SEG3" to loop 3 times.

There are three Advance Conditions to consider
with the Model 1395:

1) The Loop Count is set to some value "n" rang-

ing from

"1"

to "65,535" and the
SEQuence:ADVance selection is AUTOmatic.
Under these conditions, the segment will re­peat "n" times and then advance to the next
segment without requiring a trigger event.

2)

The Loop Count is set to "0" (continuous) and
the SEQuence:ADVance selection is TRIG-

gered. Under these conditions, the segment

will repeat continuously until the trigger event

is true, and then advance to the next segment.

NOTES

When the Loop Count is

"0"

(continuous) the

only proper selection for the SE-

Quence:ADVance selection is "TRIGgered".
Selecting "AUTOmatic" will generate an er-

ror.
Branching to the next segment can take place

immediately (ASYNchronous) or after the cur­rent segment is complete (SYNChronous) de­pending upon the

SE-Quence:TRIGger:MODE

setting.

3) The Loop Count is set to some value "n" rang­ing from

"1"

to "65,535" and the
SEQuence:ADVance selection is TRIGgered.
Under these conditions, the segment will re­peat "n" times and then remain quiescent at
the level of the last point in the segment, and
then branch to the next segment when the trig­ger event is true.

NOTES

The SEQuence:TRlGger:MODE setting can be

programmed to SYNChronous or

ASYNchro­nous. However, since Loop Count must be
complete before responding to the trigger

event, this Advance Condition will result in

complete segments being created with either

setting.

For a given trigger source, the trigger event
may or may not be true depending upon the
setting of the SEQuence:TRIG-ger:SENSe
command. The "EDGE" setting requires a

false to true transition after the Loop Count

complete, whereas the "LEVel" setting only re-

quires a true level at the time of Loop Count

completion.

The Sequence State Diagram shown in Figure 3-10
has three segments, each with Loop and Advance
Conditions set up according to the three steps
above. Segment

1

(the sine wave SEG1) is set up

to automatically branch to segment

2

after com-

pleting 5 cycles. This corresponds to step

1

in the

preceding discussion. Likewise, segment

2

(the
triangle) is set up to loop continuously until trig­gered (step

2),

and segment 3 (the negative ramp)

is set up to run for three cycles and then branch

back to segment

1

on a trigger. Currently, all three
segments are set for AUTOmatic ADVance per the
default. Program the three Advance Conditions
using the following command:

dev2:ibwrt "seq:adv trig,l;adv

trig,

2"

At this time, leave the SEQuence TRIGger MODE
as SYNChronous and the SEQuence TRIGger
SENSe as EDGE.

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Play

Back the Sequence

The 1395's current output should be a continuous
negative-going ramp with a 40 ps period and a
BBITs synchronization signal. The default STARt
and ADVance TRIGger SOURce (see Trigger Sub­system) is a

1

kHz signal from the internal trigger
source generator. The STARt SOURce is used to
trigger single Traces (as opposed to Sequences), to
start a "continuous" SEQuence, and to periodical-

ly restart a "triggered" Sequence (see paragraph

3.4.8.2). The ADVance SOURce is used to branch
from one segment to the next in

a

Sequence, after
the Loop and Advance Conditions are met for that
segment.

In this tutorial example, the STARt SOURce and
the ADVance SOURce will be the EXTernal TRIG
IN connector. Set an external generator for a

1
kHz TTL square wave per the previous examples
under "Non-Continuous Modes".

Send the following commands:

dev2:ibwrt "trig:sour ext;sour:adv

ext"

This sets both SOURces to EXTernal. Connect the

external signal to the TRIG IN connector at this
time. Then select the Sequence as the function
output:

dev2:ibwrt "func:mode seq"

This should get the sequence of waveforms going,
with branching from segment to segment under
control of the external triggering signal. Modify
the equipment interconnect given in Figure

3-4

by

disconnecting the 1395's TRIG OUT from Channel

2 of the oscilloscope. Use a BNC "tee"

tp connect

the external generator's

1

kHz square to both the

TRIG IN and to Channel

2

of the oscilloscope. Set
the oscilloscope's vertical mode to "alternate" to
observe both channels, and internally trigger from
Channel 2, negative trigger slope. Set the horizon­tal time base to 0.2 ms/DIV and adjust the trigger
hold-off as necessary to get a stable display of the
sequence centered in the display. Note the follow­ing:

1.

After a low-to-high transition of the external
square, the sequence starts with five sine
waves (SEG1).

2. Immediately following the sine waves, the tri-

angle

(SEG2) starts and runs continuously up

to the next low-to-high transition of the trig-

gering signal. The final triangle is completed

before branching.

3.

After the last triangle, the three negative
ramps (SEG3) are completed. This ends the se­quence at the last point in the ramp, a negative
dc level. It holds the negative value until a
subsequent low-to-high trigger transition re­starts the sequence.

L--

ADVANCE TRIGGER

SEQUENCE SEQUENCE

Figure

3-11.

TRIGgered Sequence State Diagram

STARTIRESTART

TRIGGER

SUBSYSTEM

COMPLETE

<

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Modify Segment 2 as follows:

Re-adjust the trigger hold-off as necessary to sta­bilize the oscilloscope display. Now the triangle

should stop after six cycles, resulting in a low dc

level between segment

2

and the start of segment

3.

Advance Triggering Commands

This tutorial has demonstrated Trigger Subsystem
commands which set up the trigger sources to

start and advance a Sequence. The Trigger Sub­system also can control the TRIGger POLarity, as
follows:

dev2: ibwrt trig:pol neg"

Note that the sequence now advances on high-to­low transitions of the external triggering signal.
Set the POLarity back to Positive:

dev2:ibwrt "trig:pol pos"

The [SOURce:]SEQuence sub-subsystem has two
additional commands which effect the advance
trigger. These have been in their default states, as
mentioned earlier in this tutorial.

Note that at the end of segment 3 the trigger level
is high, and that segment

1

doesn't restart until

the trigger goes low, and then makes a low-to-high

transition. Now program the following:

Now the sequence restarts immediately after seg-

ment 3 ends, because the trigger level is high
(true). A transition is not needed. Also note that
the advance from segment

2

to segment 3 did not
change, because the trigger level was low (false) at
the time. Return the TRIGger SENSe to EDGE:

dev2:ibwrt "seq:trig:sens edge"

Return segment 2 to its earlier appearance, as fol­lows:

Then send the command:

dev2:ibwrt "seq:trig:mode asyn"

Note that segment 2 now advances to segment 3 at
the trigger transition, without first completing the
last triangle waveform.

3.4.8.2

TRlGgered Mode Sequencing

Refer to Figure 3-11 and the following discussions
for TRIGgered Mode waveform Sequencing.

In this part of the Example

4

tutorial, the advance
trigger will be the internal tri,gger generator, and
the start trigger will come from the external trig­ger source. For this part of the tutorial, it is best
to use a 1375 or 1395 SYNC OUT

(ZCRoss) as the
external generator so that the two frequencies can
be different, but still "in sync" when the pro­grammed frequencies are harmonically related.
See "Example

1"

for information on programming

"devl". Send the following:

dev2:ibwrt "trig:sour:adv int"

The oscilloscope display may become unstable.
Switch to triggering from Channel

1

and adjust
trigger level and hold-off as necessary for a stable
display of the sequence. Set the external generator
to a frequency of

200

Hz.

Set the oscilloscope to

1
ms/DIV to see two cycles of the external trigger
and 5 "cycles" of the sequence. Then send the fol­lowing to enter triggered generator mode:

dev2:ibwrt "init:cont 0ff;:seq:adv
auto,

2"

The sequence will now have its restart cycle trig­gered by low-to-high transitions of the

200

Hz

sig-

nal.

NOTE

In the previous command, the Advance Condi­tion for the last segment in the Sequence was
changedfrom TRIGgered to AUTOmatic. Do
not use a TRIGgered Advance Condition to
branch to a Triggered Mode restart, or unpre­dictable operation may occur.

This completes Example

4.

Disconnect the test

equipment.

This paragraph provides a tutorial, Example

5,

which takes the operator through the SCPI pro­gramming steps to demonstrate Amplitude Modu­lation of the 1395.

Example

5

Refer to "Example

1"

for general information re­garding the use of National Instrument's WIBIC
application for GPIB control of VXIbus instru­ments.

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Set

up

the Model 1395 in its default states

by

send-

ing the following:

:ibf ind gpibO

dev2:ibwrt "outp 0n;:mark:sync on"

Connect the Model 1395 Unit Under Test (UUT,

slot 2) according to Figure 3-4 to display the sine

wave output on the oscilloscope. This sine wave

will be the carrier for the Amplitude Modulated
signal. A second signal is required to drive the
AM IN input connector on the Model 1395 to pro­vide the AM modulation envelope. This signal is
external to the UUT and may come from the
VXIbus module in slot

1

(see example 1) or from a
signal generator outside the VXIbus chassis. This
tutorial will assume a Wavetek Model 1375 or 1395

is located in slot 1. First, the carrier signal should

be set to a higher frequency than the modulation

signal:

dev2:ibwrt "freq le5"
dev2:ibfind devl

devl: ibwrt "outp on;:volt 0.2"

Modify the setup of Figure 3-4 by connecting the
ARB OUT (MAIN OUT) of the slot

1

module to the
AM IN of the 1395 UUT, using a BNC "tee" to con­nect the modulation signal to Channel

2

of the os­cilloscope. Observe both channels, triggering on
the

1

kHz signal on Channel

2.

Enable the AM in-

put at the UUT with the following:

dev2:ibwrt 'am onn

The signal on Channel 1 should be the 100 kHz
carrier from the UUT Amplitude Modulated ap-

proximately

100%

by the 1 kHz signal at the AM

IN. Verify Suppressed Carrier Modulation (SCM)

by sending the following:

dev2:ibwrt "am:mode scm"

The signal on Channel 1 should change to SCM.
This completes Example 5. Disconnect the equip-

ment.

The Sync Marker, when enabled, appears at the
MARKER

SYNC/H-SWP output connector of the
Model 1395 in all modes except Frequency Sweep
(see paragraph 3.4.11.1). The Sync Marker is used
to synchronize to the waveform

start/stop point
of the signal at the MAIN OUT. It could also be
used as an auxiliary TTL frequency output at the
selected waveform frequency. The Sync Marker
can be programmed as "ZCRoss" or "BBITs". The
ZCRoss form produces a synchronization signal
which would result from passing the signal at the
MAIN OUT through a zero-cross detector. The sync
is a TTL high whenever the MAIN OUT waveform
data is above half-scale (800 hex), and a TTL low
when below half-scale. This works well for most
of the Standard Waveforms, which are symmetri­cal in time and amplitude. However, arbitrary
waveforms generally do not have symmetry and
may have multiple zero-crossings. Then the BBITs

form should be used, which provides a narrow
pulse at the start/stop point.

The Sync Marker has been demonstrated in previ­ous examples. See Figure 3-5 and Example

1

for
Continuous Mode waveform synchronization, and
Figures 3-8 and 3-9 and Example 3 for Non-contin­uous Modes waveform synchronization.

The following tutorial, Example

6,

takes the opera­tor through the SCPI programming steps to dem­onstrate the use of the Position Marker of the 1395.

Example

6

Refer to "Example

1"

for general information re­garding the use of National Instrument's WIBIC
application for GPIB control of VXIbus instru­ments.

Set up the Model 1395 in its default states by send-

ing the following:

:ibf ind gpibO

gpib0

:

ibf ind dev2
dev2:ibwrt "res"
dev2: ibwrt "outp on; :mark:sync onn

Connect the Model 1395 Unit Under Test (UUT,

slot 2) according to Figure 3-4 to display the sine
wave output on the oscilloscope. Note the use of

the ZCRoss Sync Marker on Channel 2 of the oscil­loscope to provide waveform synchronization.

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Remove the cable at the SYNCIH-SWP output of
the UUT and connect it to the POSN output. The
oscilloscope will loose sync. Set the oscilloscope
to trigger internally from Channel

1.

Note that the

POSN output is a TTL low.
The Position Marker requires programming to ap-

pear at the POSN output. The

[SOURce: I MARKer: POS-

ition:POINt~trace~name~,~pointition:POINt<trace_name>,<point_index>inde~>

command will be used to set position markers.
First, create a Trace:

dev2:ibwrt "func usern

This "clones" the sine function with the default
size of

8192

points. Provide a synchronization

pulse starting at the

"90""

phase point of the sine
wave using the Position Marker with the follow­ing commands:

dev2:ibwrt "mark:pos:poin

sin1,2047; poin sin1,2048;poin
sin1,2049"

This creates a TTL positive pulse 3 samples wide
covering points

2047,2048,

and

2049

of the sine

wave, which has a relative address range of 0 to

8191.

It was created 3 samples wide for easier vis-

ibility on Channel

2

of the oscilloscope. By
switching the oscilloscope trigger source from
Channel

1

to Channel

2,

the MAIN

OUT

can be

viewed as

a

cosine (90' starting phase).

This completes Example

6.

Disconnect the test

equipment.

8.4.1

1

Frspueney

Sweep

The Model

1395

provides two mechanisms (other

than direct programming) for rapid control of the

generator's instantaneous frequency. These are

covered in the next two paragraphs.

Triggered Sweep
and Reverse

(TREVerse)

Triggered Sweep

and Hold
(HRESet)

:/

I

I

Triggered Sweep
and Hold with Reverse
(HREVerse)

I

I

Trigger

Event

Figure

3-12.

Sweep Mode Characteristics.

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3.4.11.1

Sweep

Generator

The Sweep Generator is controlled by a group of
commands under the Source Subsystem which

start with

"

[SOURce: I SWE~~".

When the com-

mand"[~~~~ce:lF~E~uency:MODE

SWEep"

is sent, changing the Frequency Mode from its de­fault value of

"Cw"

to

"Sw~ep",

the Sweep Gener-

ator is enabled. The following tutorial, Example

7,

takes the operator through the SCPI programming
steps to demonstrate the use of the Model 1395's
Sweep Generator.

Example

7

Refer to "Example

1"

for general information re­garding the use of National Instrument's WIBIC
application for GPIB control of

VXIbus instru-

ments.
Set up the Model 1395 in its default states by send-

ing the following:

:ibf ind gpibO

dev2: ibwrt 'res"
dev2

:

ibwrt "outp on"

Connect the Model 1395 Unit Under Test (UUT,
slot 2) according to Figure 3-4 to display the sine
wave output on the oscilloscope. Then send the
following:

dev2:ibwrt "freq:mode swe"

The oscilloscope display should show the sine
wave being swept from a lower frequency to a
higher frequency. Additionally, the signal on
Channel 2 should now be a voltage level indicat­ing instantaneous sweep position. All Sweep Gen­erator settings are at their default values, as

follows:

Start Frequency

1

kHz
Stop Frequency 100 kHz
Manual Frequency

1

kHz
Sweep Count

1
Sweep Direction UP
Sweep SpacingLINear
Sweep Time

1

s

Sweep Mode CRESet
The Start and Stop Frequency settings indicate that

the Sweep Generator is set to sweep between

1

kHz and 100 kHz. Since the DIRection is UP, the

Sweep Generator resets to

1

kHz and LINearly

sweeps UP to 100 kHz, and then resets to the Start

value. The process is repeated once each second.
Adjust the Start and Stop Frequency values with
the following command and note the change in

frequencies on the oscilloscope:

Sweep Direction reverses the higher and lower fre­quencies as follows:

dev2:ibwrt "swe:dir down"

Set the DIRection back to normal and then change

the "spacing" from LINear to LOGarithmic:

dev2:ibwrt "swe:dir up"
dev2:ibwrt "swe:spac

log"

The horizontal drive signal on Channel 2 is not
changed, and remains a linear indication of posi­tion within the sweep relative to sweep time.
However, the swept sine wave on Channel

1
should be spending more of the sweep time at
lower frequencies and less at higher frequencies.
A LOGarithmic sweep will spend equal time per
octave (and decade) of frequency coverage. Select
the sweep time with the following:

The time from Start to Stop Frequency should now

be 2 seconds.

The various Sweep Modes available in the Model

1395 are depicted in Figure 3-12. The figure shows
how frequency changes as a function of time, us­ing LINear SPACing and with the DIRection set to
UP. The default Mode is CRESet (Continuous
sweep and

RESet). The sweep is Continuous be­cause it proceeds continuously, without the need
of a triggering signal. A single sweep starts at the
Start Frequency (for "UP" DIRection), sweeps to
the Stop frequency over the selected Sweep Time,
and then immediately

RESets back to the Start.

The difference between the CRESet and

CREVerse
Sweep Modes is evident after sending the follow­ing:

dev2:ibwrt "swe:mode crev"

Note that instead of immediately resetting to the
Start, frequency sweeps back down from Stop to
Start, again at the rate set by the Sweep Time.

The remaining sweep modes are triggered sweeps.
Set the Trigger Timer to 5 seconds and the Sweep

Mode to

TRESet with the following:

dev2:ibwrt "trig:tim 5;:swe:mode

tres"

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Compare the sweep action to the figure for TRESet
Sweep Mode. Set the Sweep Mode to TREVerse
with the following:

dev2:ibwrt 'swe:mode trev"

Compare the sweep action to the figure for TRE­Verse Sweep Mode. Set the Sweep Mode to

HRESet with the following:

dev2:ibwrt "swe:mode hres"

Compare the sweep action to the figure for

HRESet Sweep Mode. Set the Sweep Mode to
HREVerse with the following:

dev2:ibwrt "swe:mode hrev"

Compare the sweep action to the figure for HRE­Verse Sweep Mode.

The final Sweep Mode is

MANual. In this mode

the sweep action stops and the frequency value
can be programmed directly to values between the
Start and Stop Frequencies. The difference be-

tween this Sweep Mode and going back to CW

Frequency Mode, is that the SYNC/H-SWP output

continues to output a voltage proportional to posi-

tion within the sweep. When this voltage is used

to drive the horizontal axis of an

X-Y

display de­vice, and the Sweep Generator is driving a fre­quency selective device such as a filter, the user
can manually locate a point in the device's re­sponse and determine its exact frequency.

Continue on with Example 7 to the next paragraph
demonstrating the Frequency List.

3.4.11.2

Frequency

List

The Frequency List provides an additional tool for

the programmer to achieve frequency agility. The
List provides frequency "hopping" between pre­programmed fixed frequency settings, rather than
a contiguous sweep between

start/stop settings.
The main advantages are simplicity and speed of
programming. Frequency List supports approxi­mately

2000

setting changes per second, which im-

proves the approximate

50

settings per second that
can be obtained by sending frequency setting com­mands over the VXIbus.

The mechanism for hopping from the current set-

ting in the List to the next setting is the trigger

event. The trigger event can come from any of the
available trigger sources defined in paragraph

3.4.7.1. This is especially useful in an ATE system
environment, where the command to advance
from one setting to the next can come from exter-

nal equipment signals at the TRIG IN input, or
through the system controller as a

*TRG or TRIG-

ger command.
Frequency values are first entered into the Fre-

quency List. Use the

[

SOURce

:

1

LIST : POINts

<va

1

ue

>

command to set the active size of the

list, where

<value

>

ranges from 1 to 1024 points.

Enter frequency values into the list with the

[SOURce:lLIST: FREQuency <value>,

<index>

command, where

<value>

is the fre­quency value to be set at the list position deter­mined by the

<

index>

(which ranges from 0 to

the active size minus

1).

Then the

[

SOURce

:

I

FREQuency

:MODE

LIST

command is used to

start frequency hopping.
Set the following commands to make a simple Fre-

quency List:

dev2:ibwrt "outp 0n;:mark:sync on"

dev2:ibwrt "freq:mode list"

The sine wave should hop from one frequency on
the list to the next once per second, the internal
trigger timer interval. This completes Example

7.

8.4.1

2

SUMBUS

Operation

Operations involving the VXIbus SUMBUS require
two modules, one to drive and one to receive,
which support the

SUMBUS. At the time of this
writing, the Wavetek Models 1391 and 1395 sup­port the SUMBUS.

The VXIbus environment was designed to promote
the inter-operation of modules within the environ­ment of a chassis with closer coupling of signal
timing than is possible between "stand-alone"
equipment. Intermodule operation can be gener­alized as "serial" or "parallel" operation. Serial
operation results in a final output being taken

from one module. Parallel operation results in an
output being taken from each module, with com­mon timing characteristics between modules.
SUMBUS operation is serial; paragraph 3.4.14, In­termodule Operation, is concerned with parallel

operation.

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The VXIbus SUMBUS is intended to operate as an
analog summing node. The SUMBUS is a single
50Q transmission line passing the length of the
VXIbus chassis backplane. It is terminated into a
5052 resistor at each end, resulting in an imped­ance of

25Q

to ground. Each module looks like a
high impedance "stub" from the SUMBUS line.
Modules which support SUMBUS will have a
Driver and a Receiver located on this "stub". The
Driver, when enabled, will source current to and

from the

SUMBUS line. The SUMBUS signal is a

voltage signal resulting from the algebraic sum of

all Driver currents with a scale factor of 40 mA per
volt (2552).

A

module's Receiver can buffer the

SUMBUS signal and apply it as a summing input

to its output amplifier. This way, a receiving mod­ule can have an output which is the composite of
its own programmed output and the SUMBUS sig­nal.

The programmer/operator needs to be aware of

several limitations in order to use the SUMBUS ef­fectively. Any number of modules can drive the
SUMBUS, and any number of modules can receive
from the SUMBUS. However, a given module can
drive only or receive only. When one or more
modules are set up to drive, the peak instanta­neous current at the

SUMBUS line must not ex­ceed 40 mA. In order to output a certain level of
the

SUMBUS signal at the receiving module's out­put, the programmer/operator must know the re­ceiver module's receive scale factor and then
control the SUMBUS signal level accordingly. Ad­ditionally, the peak instantaneous value of the
scaled and buffered

SUMBUS signal and the mod­ule's own signal must not exceed the output am­plifier's limits, or clipping will occur. The
waveform contribution from the SUMBUS will

also have reduced bandwidth and wider specifica-

tions for amplitude accuracy and waveform dc off-

set than outputs appearing directly at the MAIN
OUT. See Section

1

of this manual for SUMBUS

specifications.
The following tutorial, Example

8,

takes the opera­tor through the SCPI programming steps to dem­onstrate the use of the Model 1395's SUMBUS
operation. The tutorial assumes a Model 1395 in
slot

1

using secondary address

1,

and a Model

1395 (the UUT) in slot 2 using secondary address

2. The 1395 in slot

1

will drive the SUMBUS, and
the UUT will receive the SUMBUS and provide the
composite output at its MAIN OUT.

Example

8

Refer to "Example

1"

for general information re-

garding the use of National Instrument's WIBIC
application for GPIB control of VXIbus instru­ments.

Set up the UUT in its default states by sending the

following:

:ibf ind gpibO

gpib0:

ibf ind dev2

dev2:ibwrt "outp 0n;:mark:sync on"

Set up the other Model 1395 in its default states by

sending the following:

dev2:ibfind devl

dev1:ibwrt "outp 0n;:mark:sync onn

Then set up "devl" to drive a signal to the SUM­BUS. This signal is a full amplitude 10 kHz sine
wave. Wavetek's SUMBUS instruments have their
Driver scale factors set such that a full output lev­el at the main output causes the

SUMBUS to be

driven at f40 mA (f

1

volt across 2552). Similarly,

their Receiver scale factors are set such that a

f1

volt signal at the SUMBUS, if unattenuated, will

drive the main output to full amplitude. This can

be seen by taking the product of the specified

Driver and Receiver scale factors from Section

1.
If this product, after considering the voltage de­veloped by the Driver into 2552, is

1

V/V, then

end-to-end scale factor is unity.

A

unity overall
scale factor indicates that whatever signal is at the
output of the driving module will be a component
of the composite output at the receiving module
(with Receiver attenuation set for

1:l).

It is best to set up the driving module to full am­plitude in order to drive the SUMBUS to its full

+I

volt amplitude. This produces the best amplitude

accuracy and signal-to-noise ratio with the lowest
dc offset. Then use the receiver's attenuator to set

the level of signal contribution from the

SUMBUS.

Program "devl" as follows:

devl: ibwrt "volt

7.5"

dev1:ibwrt "outp:sumb on"

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IME

NIV

m-

CHAh

Lhe

CHAh

Lhe

8 8

8

4

.

/

TTLTrgen7 Trigger Lines

Figure

3-13.

Intermodule Triggering Backplane Connections.

Now set up the UUT, "dev2", to receive the SUM­BUS signal:

3) The SUMBUS receiver attenuator was set to
"12", which indicates -12 dB attenuation. This
is a

1:4 voltage ratio, so the SUMBUS contribu-

tion is 15 Vpp divided by

4,

or 3.75 Vpp.

devl: ibf

ind

dev2

dev2:ibwrt "volt

5"

dev2:ibwrt "surnb:att 12;:sumb

on"

The UUT's MAIN OUT signal will be a 10 Vpp (5
volts peak into 50Q),

1

kHz sine wave with an ap­proximate 3.75 Vpp, 10 kHz sine wave riding on it,
for a total approximate 13.75 Vpp composite sig­nal. This is safely below the 15 Vpp maximum, so
no output clipping will occur.

8.4.1

3

Clock

InputlOutput

Operation

The 1395's waveform synthesis operates in two
modes. "Phase Accumulation" or "CW" Mode op­erates from a fixed 50 MHz waveform clock, and is
used with most of the Standard Functions. "Ras­ter" Mode operates with a variable frequency
clock, and is primarily used with arbitrary wave­forms (Traces specified by the USER

FUNCtion).
These selections are automatic, but may be over­ridden by the operator. In either case, the wave­form Clock is the waveform sample frequency, and

the corresponding sample period is the time spent
at each point selected for waveform playback. The
Clock is normally generated internally and avail­able for output at the CLK

IN/OUT connector.

The 3.75 Vpp figure is obtained as follows:

1)

'hDevl" is set to full 15 Vpp amplitude. There­fore, it is driving the SUMBUS to its full

1

Vpp

amplitude.

2) The full amplitude SUMBUS signal will drive
the UUT's output to 15 Vpp full scale if unat-

tenuated.

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Figure

3-14.

Intermodule Triggering Command Reference.

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The connector may also be an input for an external
signal which will control the waveform sample
frequency.

The following tutorial, Example

9,

takes the opera-

tor through the SCPI programming steps to dem-

onstrate the use

of

the Model 1395's Clock

Sources.

Example

9

Refer to "Example

1"

for general information re­garding the use of National Instrument's WIBIC
application for

GPIB

control of VXIbus instru-

ments.
Set up the Model 1395 in its default states by send-

ing the following:

:ibf ind gpibO

dev2:ibwrt "res"
dev2:ibwrt "outp 0n;:mark:sync on"

Connect the Model 1395 Unit Under Test (UUT,
slot

2)

according to Figure 3-4 to display the sine

wave output on Channel

1

of the oscilloscope.
Trigger the oscilloscope internally from Channel 2.
Move the BNC cable from the

SYNC/H-SWP out­put to the CLK IN/OUT connector. Note that
there is no TTL level signal on Channel

2.

Then

send the following:

Note that the sine wave turns off and that Channel

2

now has narrow positive pulses occurring at 1 ps
intervals. The UUT is now in a "special" mode of
operation wherein the SCPI programming re­quired to turn off the MAIN OUT, configure the
CLK IN/OUT as an output, set up the Clock
Source as

RASTer or SYNThesizer, and program
the required frequency to get a frequency of le6 at
the CLK

IN/OUT has all been done. As long as

the operator remains in this special Clock Mode,

the Clock Frequency is programmable with the

above command. Cancel Clock Mode by sending:

dev2:ibwrt 'outp 0n;:mark:sync on"

The next set of commands accomplish the same

task without going into Clock Mode. This requires
more commands, but it has the advantage of leav­ing the waveform output on. Send the following:

dev2:ibwrt "trac:mode rast;:

outp:cloc:sour rast;:freq:rast

le6"

dev2:ibwrt "c1oc:conf outp"

The waveform on Channel 2 will be the narrow
clock pulses

at

1

ps

intervals

(1

-MHz).

The wave-

form on Channel 2 will be the 4096 point sine

wave with a

1

MHz sample frequency, or approxi-

mately 244 Hz.

The remainder of the example will deal with using
the

CLK

IN/OUT as an input. Reset the UUT with

the following:

dev2:ibwrt "outp 0n;:rnark:sync on"

The Clock Output signal on Channel 2 will disap-

pear. Move the cable from CLK IN/OUT to
SYNC/H-SWP OUT and trigger on the ZCRoss
sync on Channel

2.

Channel 1 has the default

1
kHz, 4096 point sine wave. The RESet sets the
CLK IN/OUT back to its default configuration, as
an

INPut. Send the following:

dev2:ibwrt "rosc:sour ext"

The waveforms on the oscilloscope stop. Connect
a TTL level signal from an external source to the
CLK

IN/OUT connector (the module in slot

1

or
an external generator may be used). The frequen­cy of this signal can be in the range of dc to 50
MHz. For a

1

kHz output of the sine wave at the

1395's MAIN OUT, the "CW Mode" clock needs to
be 50 MHz. A lower Clock Frequency will scale
the sine wave frequency down proportionately.

The remainder of this example assumes that the
module in slot

1

is another Model 1395.

The fol-

lowing program steps will use a 50 MHz Clock

Frequency from "devl" to drive the VXIbus ECL
Trigger Line 1, which will be input to "dev2" as its

ROSCillator (reference oscillator) Clock Frequency.

Send the following:

dev2: ibwrt "rosc: sour ecltl"

dev2:ibfind devl

dev1:ibwrt "res;:outp:ecltl on"

After the first command the UUT's MAIN OUT

should stop, and after the last command the sine

wave should return.

The

1

kHz sine wave fre­quency indicates that the UUT is being clocked at
50 MHz.

This completes Example 9. Disconnect the test

equipment.

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8.4.14

Intermodule Oprations

3.4.14.1

Intermodule Triggering

Intermodule triggering provides much greater ver-

satility than single module triggering as described
in Example 3 (paragraph 3.4.7 and Figures 3-8 and
3-9).

Intermodule triggering utilizes interconnections on

the VXIbus backplane. Figure 3-13 diagrams these

interconnections. The figure illustrates three Mod-

el 1395 modules adjacent to one another (their de-

vice numbers are consecutive) in the VXIbus chas-

sis. This is required to "daisy chain" the VXIbus

Local Bus from module to module. For the pur­pose of this discussion on triggering, each module
can be thought of as a Trigger Input Selector and a
Trigger Output Selector (of course, the waveform

generation circuits are positioned between the

two).

The eight TTL Trigger lines run the full length of

the backplane and do not require Local Bus sup-

port. The CHAin and ECHain Lines are part of the

Local Bus between two Model 1395s. Each Trigger

Input Selector can select between INTernal,

EXTer­nal, CHAin, ECHain, one of eight TTL Trigger
lines, and Word Serial trigger inputs to trigger the
waveform generator circuits. Each Trigger Output
Selector has several input signals from the wave­form generation circuits (not shown at this level,
see Figure 3-14) and the INTernal trigger signal.
The Output Selector selects a signal as the Output
Trigger Source. This signal is always connected to
the CHAin Line and to the input of the next mod­ule to the right. It may also be selected to drive
the ECHain Line or one of the eight TTL Trigger
lines.

Intermodule triggering can be accomplished with
the TTL Trigger lines or with the Local Bus
CHAin/ECHain lines. The example programming
in this paragraph (Example 10) will demonstrate
both methods. The CHAin/ECHain method is
more versatile, but it requires that the modules be
adiacent for Local Bus

o~eration.

In general, the left-most module will be the timing
master.

h he

CHAin Line passes triggers left-to­right one module at a time. The right-most mod­ule in the chain will usually drive the ECHain Line
back to the left-most module. This general outline

is not the only possibility, the fact that the ECHain
Line is

"wire-ORed" to all trigger outputs suggests

that more complex triggering schemes can be

im-

The shaded box in Figure

3-13

indicates

the

area

which is diagrammed in greater detail in Figure

3-

14. Figure 3-14 not only provides a functional
block diagram of triggering operations, but also
provides SCPI commands which apply to each
block. It is intended that the programmer/opera­tor use this figure as a programming aid when
dealing with this very complex subject.

Figure 3-14 diagrams the operation of Trigger Out­put selection and Trigger Source selection. The fig­ure relates more closely to the SCPI commands
rather than the physical hardware. The selected
Reference Oscillator

(ROSCillator) clocks the Ad-

dress

Generator/Mode Control block, which in
turn outputs Addresses to Trace Memory. These
Addresses are updated at the rate of the waveform
sample frequency. Selected Traces are accessed ac­cording to their <trace-names> included in the
SCPI programming for waveforms and/or Se-

quences.
On a Trace-by-Trace basis, the programmer can

choose to set or not set Markers within waveforms.
These Markers can be used as the source for trig­gering signals, either directly or through gating
with signals from the Loop or Burst Counters.

Trace Memory has 16 bits of data output. 12 bits
are used for the waveform Digital to Analog Con­verter (DAC). The remaining 4 bits are Marker
lines, which can be set true on selected points in a
Trace. The SYNC Marker can be set up to provide
either the

BBITs or ZCRoss synchronization signal
to drive the SYNC/H-SWP output. The POSITION
Marker can have selected points set true in a given
Trace. The POSITION Marker drives the POSI­TION output, and can be selected to

qualify

the
OUTPUT TRIGGER. The TRIGGER Marker can be
turned on or off for a given Trace. The TRIGGER
Marker, which is set to appear at the end of a
Trace, can be chosen to

qualify

the OUTPUT TRIG-

GER. The Z-AXIS Marker is not used in the Model

1395. Below the Trace Memory block in the figure,
note the three SCPI commands which are used to
define the POSITION and TRIGGER Markers.

The

OUTP:TRIG:MARK

<POS

I

TRIG>

command
selects which of the two Markers are used to drive
the "BIT" signal. The BIT signal is one of the Trig-

ger Sources applied to the Output Trigger Source
Selector. The BIT signal is true for selected "bits"
within selected Traces. The BIT signal contains

the Trace-specific position information of the

Marker that produced it.

plemented.

3-54

OPERATION

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When a Sequence is defined, the

SEQ

:

DwEL

<value>

command is used to determine how
many times to repeat (Loop on) a given segment
before passing to the next. During playback this
repeat count is controlled by the Loop Counter on
a Trace-by-Trace basis. The output of the Loop
Counter is false except during the last cycle of the
Trace using a repeat count. The BIT signal is

quali-

fied

with (ANDed with) the Loop Count Complete
signal to produce the LCOM (Loop Complete) sig­nal. The LCOM signal is the same as the BIT sig­nal, except that only the bits that occur in the final
cycle of sequence loops remain.

The command

TRIG : COUN

<value>

deter­mines how many times a Trace or complete Se­quence repeats each time it is triggered. The
trigger count is controlled by the Burst Counter.
The Burst Count Complete is true during the last

cycle of a Trace or Sequence using a trigger count.
Both Loop and Burst Complete are used to qualify
the BIT signal, producing the BCOM (Burst Com­plete) signal. This is true for the last loop of the
last burst of the selected Trace(s).

The INTernal trigger rate generator, under control
of the

TRIG : TIM

<value>

command, is a final

input to the Output Trigger Source Selector.
The command

OUTP : TRI

G

:

SOUR selects among
the various trigger sources to produce the Output
Trigger. The Output Trigger is sent to the Local
Bus CHAin line and to the input trigger selectors
in the next module to the right in the VXIbus chas­sis. It can also be selected to drive the Local Bus
ECHain line using the

OUTP : TRIG

:

END ON

command. The Output Trigger is sent to the
TTLTrg<n> Driver, where it can be selected to
drive one of the eight TTL Trigger lines using the

OUTP:

TTLT<n>

ON

command.

The selected Output Trigger passes through the
backplane to the next Model 1395 in the trigger

chain. There are two input trigger selectors on a
Model 1395, one to generate the Start Trigger and
one to generate the Advance Trigger. In addition
to the Output Trigger from the previous module,
the TRIG IN connector and the Internal Timer are
inputs to the trigger source selectors. Note that
the

TTLTrg line can be used to generate a Start

Trigger, but not an Advance Trigger.

Model 1395 in slot 1 using secondary address 1,
and another Model 1395 in slot

2

using secondary

address

2.

The 1395 in slot 1 will drive and re-

ceive the ROSCillator on ECLT1, and will drive the

Local Bus CHAin and TTL Trigger lines. The 1395

in slot

2

will receive the ROSCillator on ECLTl,
will receive the trigger on the CHAin and TTLTl
lines, and will drive the Local Bus ECHain line
with its trigger output. Both modules will be pro­viding waveform outputs at their MAIN OUT con-

nectors.

Example

10

Refer to "Example

1"

for general information re­garding the use of National Instrument's WIBIC
application for GPIB control of VXIbus instru­ments.

Set up the UUT in its default states by sending the
following:

gpib0:

ibf ind dev2

dev2:ibwrt "outp 0n;:mark:sync on"

Set up the other Model 1395 in its default states by

sending the following:

dev2:ibfind devl

dev1:ibwrt "res"

dev1:ibwrt 'outp 0n;:mark:sync on"

Verify that both modules are generating a 1 kHz
sine wave at the MAIN OUT and a ZCRoss sync at
the

SYNC/H-SWP OUT.

The first task recommended for intermodule trig-

gering is to put all modules in the triggering
"chain" on the same waveform clock. This assures
the closest possible signal coupling for proper tim­ing. One module (if a group of adjacent modules
is used, select one near the middle of the group) is
selected as the Reference Oscillator source. This
module will drive its waveform clock to

ECLTl.
All modules, including the reference source, will
receive their Reference Oscillator from

ECLT1.

This way, the waveform sample frequency will be

controlled by the chosen reference source. Pro­gram the modules as follows:

The following tutorial, Example

10,

takes the oper-

devl : ibwr t

'

outp : e c 1 t

1

ator through the SCPI programming steps to dem-

on

;

:

rosc : sour

ecl t 1

"

onstrate the use of the Model 1395's Intermodule

devl

:

bf

ind

dev2

Triggering operation. The tutorial assumes a

dev2:ibwrt 'rosc:sour ecltl"

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Verify that both modules' outputs remain un­changed. Then set up the waveform which will be
used on "dev2" as follows:

dev2:ibwrt "func:user sin100;:func
user"

Verify "dev2's" output is now a 500 kHz

(2

ps)

sine with BBITs sync. Then set up the waveforms
which will be used on "devl" as follows:

dev2:ibfind devl
devl: ibwrt 'trac: def

ramp100,lOO;def tri100,lOO;data

ramp100,pram;data trilOO,trin

dev1:ibwrt 'func:user ramp100;:func
userw

Verify "devl's" output is now a 500 kHz (2 ps)

positive ramp with BBITs sync. Then send:

Verify "devl's" output is now

a

500 kHz

(2

ps) tri­angle with BBITs sync. Reduce the sample fre­quency from 50 MHz to 10 MHz to get triggering
signals within the VXIbus bandwidth specification
for the TTL Trigger lines:

NOTE

In this example each module in the chain was
programmed to a Raster Frequency below the
VXIbus bandwidth limit for TTL Trigger lines.
As an alternative, the Raster Frequency could
remain at

50

MHz

for higher waveform fre­quencies, and the programmer would have to
ensure that any triggering signals that use the
backplane were set to be several samples wide.

Verify both modules output 100 kHz (10 ps) sig­nals. Set up a trigger repeat count for the "dev2"
waveform:

Set up

a

Sequence on "devl" as follows:

dev2:ibfind devl

The advance condition for both segments remains
defaulted to AUTOmatic. Set the Sequence to
"Loop" three times per start trigger:

.

Start the sequence:

Use the oscilloscope's trigger hold-off to verify a
sequence alternating between two ramps and
three triangles. Set up the Position Marker as a
synchronization signal for proper viewing of the
Sequence, and set up the trigger source output to
the backplane, as follows:

dev1:ibwz-t "mark:pos:poin

tri100,50n

Switch the cable from the SYNC/H-SWP connec-

tor to the POSN connector. Note that sync pulses
occur at the triangle positive peaks. The oscillo­scope display should be as follows:

Program the Trigger Marker Source as follows:

devl: ibwrt 'outp: trig:mark pos; sour

lcom"

devl: ibwrt

'outp:ttltl on"

This command selects the Position marker as the
BIT trigger signal. The BIT signal (identical to the
position marker on the oscilloscope) is then AND-

ed with the triangle's Loop Complete signal to
produce the "LCOM" trigger signal, which occurs
at the positive peak (last point in Trace) of the last
triangle in each pass through the Sequence, as fol­lows (the BIT, LCOM, and BCOM signals cannot
be displayed on the oscilloscope):

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Finally, the LCOM signal is placed on the VXIbus
TTL Trigger line

1

with the last command.

Now, set up "dev2" to be triggered from the
LCOM signal:

dev2:ibwrt "trig:sour ttltl;: init:

cont off"

Move the cable from the

POSN

output of "devl"

to the MAIN

OUT

of "dev2". Observe the trig-

gered waveforms.

Next modify the Sequence so that it is triggered,
as follows:

dev2: ibfind

devl

dev1:ibwrt "trig:sour:star int;:
trig:tim 3e-4;:init:cont off"

Trigger internally from Channel 1 and use trigger
hold-off to stabilize the display. The waveforms
should now appear as follows.

The top trace is the "two ramp/three triangle" Se­quence repeated three times. The lower trace
shows the three sine burst triggered by the LCOM
qualified position marker at the peak of the last
triangle in each "loop" of the triangle segment.
To change from LCOM to BCOM send the com­mand:

The BCOM qualified position marker occurs only
at the selected point in the final segment of the
bursted Sequence. Verify that the same waveform
is generated by using the Local Bus CHAin line in­stead of the

TTLTrgcb line by sending the follow-

ing:

dev1:ibfind dev2

The waveform on the oscilloscope should not
change. Note that "devl" did not need to be set
up to drive the CHAin line; the selected output
trigger source always drives the CHAin line.

As a final part in this example,

"dev2" will be set
up to drive the ECHain line back to "devl", using
its trigger marker. Then "devl" will run the Se­quence and trigger "dev2". Following its trigger

"dev2" will run its waveform and then trigger

"devl". This way activity can be sustained, alter­nating back and forth between the two modules.
Send the following commands:

dev2:ibwrt "mark:trig sin100,on;:

0utp:trig:mark trig;sour bcom;end

on"
dev2:ibfind devl

The waveforms may turn off. If so, re-initiate Se-

quence Start on "devl" with the following"

devl: ibwrt "trig"

The resulting output should appear as follows.

This completes Example 10. Disconnect the test

equipment.

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3.4.14.2

Intermodule

Phase

Lock

The following tutorial, Example 11, takes the oper-

ator through the SCPI programming steps to dem­onstrate the use of the Model 1395's Phase Lock
operation. The tutorial assumes a Model 1395 in
slot

1

using secondary address 1, and a Model

1395 in slot

2

using secondary address

2.

Example

1 1

Refer to "Example

1"

for general information re­garding the use of National Instrument's WIBIC
application for GPIB control of VXIbus instru­ments.

Set up the UUT in its default states by sending the
following:

:ibf ind gpibO

dev2: ibwrt "outp on; :mark: sync on"

Set up the other Model 1395 in its default states by
sending the following:

dev2:ibfind devl

dev1:ibwrt "outp 0n;:mark:sync on"

Phase Lock operation requires that the modules be
adjacent to one another in the VXIbus chassis be­cause the Local Bus is used for phase synchroniza­tion signals. One module is designated the

"Master" and the other (or others) is designated
the "Slave". The modules must all be using the
Master as the Reference Oscillator for their wave­form sample clock. Additionally, the waveform
Traces of all modules must have the same number
of points and must be played back at the same
clock frequency.

For this example "devl" will be the Master and
"dev2" will be the Slave. The default sine waves
will be used.

Program the following to set the two modules to
the same Reference Oscillator and waveform clock
frequency:

dev1:ibwrt 'outp:ecltl

on;:rosc:sour ecltl"

dev2:ibwrt "rosc:sour ecltl"

Modify the setup of Figure 3-4 by connecting the
MAIN OUT from the Master to Channel

1

of the
oscilloscope. Externally trigger the oscilloscope
from the Master's SYNC/H-SWP output. Use pos-

itive slope for the external trigger and note that

the sine wave on Channel

1

starts at its positive-

going zero crossing. This corresponds to

0'

phase
of a sine wave. Connect the Slave's MAIN OUT to
Channel

2

and note that its starting phase is fixed
at some arbitrary phase relationship to the Master.
Initiate Phase Lock as follows:

dev2:ibwrt "phase:lock on"
dev2:ibfind devl

dev1:ibwrt 'phase:lock on"

The two sine waves should be in phase. Modify
the Slave's phase relationship with the following:

devl: ibf ind dev2
dev2:ibwrt "phase 90"

The waveform on Channel 2 should now have its
starting phase at its positive peak (cosine wave).
Experiment with other phase angles.

This completes Example

11.

Disconnect the test

equipment.

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Calibration

Section

4

4.1

FACTORY REPAIR

4.3

REQUIRED TEST EQUIPMENT

Wavetek maintains a factory repair department

The test equipment required to perform the Per-

for those customers not possessing the necessary

formance Verification Procedure and the Align-

personnel or test equipment to maintain the in-

ment Procedure is listed in table

4-1.

strument. If an instrument is returned to the fac­tory for calibration or repair, a detailed descrip-

Table

4-1.

List

of

Test Equipment

tion of the specific problem should be attached
to minimize the turn-around time.

4.2

CALIBRATION

Calibration

is the process of

Scheduled Mainte-

nance

as described in this section of the Model

1395

manual. Through Calibration, the unit is
certified to be operational and within the specifi­cations listed in Section

1

of this manual. The

Calibration is valid over a specified

Calibration

Interval.

After the interval (typically 1 year), the
operator returns the unit to the metrology labo­ratory for Calibration. Units returned at the
scheduled interval, without a failure description,
may be calibrated and returned to the operator

using procedures in this section of the manual.

Start the Calibration with the

Performance Verifi-

cation Procedure

following immediately in this
section. Performance Verification tests the unit
vigorously to the specifications in Section

1,

us­ing external test equipment and signals at the
unit's input and output connectors. There are
Performance Verification Data sheets at the end
of this section which are intended to be copied
and used to record the data values from the veri­fication test. Completed Performance Verifica­tion Data sheets with no out-of-tolerance read­ings is sufficient for certification of Calibration
and return to the operator.

'If there are out-of-tolerance readings, perform

the Alignment Procedure later in this section.
After s&cessful completion of alignment, com-

plete the Performance Verification Procedure.
If the Alignment Procedure cannot be run suc-

cessfully, or if the Performance Verification Data
still has out-of-tolerance readings after align­ment, then the instrument should be returned to
the factory for repair.

Equipment

VXI

Reqmts

Multimeter

Oscilloscope

Freq Counter

Signal Gen

Voltage Source
Adaptors

Coaxial cables

Probes
50R Termination:

1

1 ea.

Specifications

VXI

chassis.

VXI

slot-0 controller.

VXI

"C" size extender

board. (Optional-see text)

HP

3478A or equivalent.

Tektronix 2465 or equiva­lent.

HP 5334A Universal
Counter.

Wavetek 1395 or equiva­lent

VXIbus generator,

triggerable,

25%

accuracy

from 25

Hz

to 50 MHz.

-10 Vdc to +10 Vdc.
BNC female to banana

jacks, BNC "tee".

BNC male connectors,
RG58U cable.

10

MR.

Feedthrough, 0.1% accu­racy,

2W.

4.4

PERFORMANCE VERIFICATION

PROCEDURE

The Performance Verification Procedure is given

in the following paragraphs. These step-by-step
procedures outline the equipment setup and in­terconnect. Once set up for a reading, the vari­ous parameter settings and limits are given in
the specified data table

in

the Performance Veri-

fication Data sheets at the end of this section.

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4.4.3 TEST SPECIFICATIONS

4.4.1 STANDARD TEST EQUIPMENT

The following list of test equipment is included
in this ATS for reference only. Substitution of
any equipment is allowed as long as adequate
measurement accuracy is maintained. Test
equipment and test methods should always pro­vide at least 5 times better measurement accura­cy than the specification of the parameter being

tested.

Accessory type equipment such as coax cables
and terminations are not listed here. Use of ap­propriate accessories for the type of test being
performed is assumed. If an accessory item is
critical to the accuracy of a measurement, its re­quirements will be defined in the test procedure.

Salient characteristics of the equipment listed
below are not specified. If substitution of equip-

ment is desired, a review of the test procedures
must be made to ensure that the substitute has
all salient characteristics.

Signal Sources:Wavetek Model 91 Synthesized
Pulse/Function Generator

This section outlines test specifications
the module must meet in order to pass the ac­ceptance test. During the testing of the module
the frequency reference for the VXIbus chassis

and all frequency related instruments in the test
system should be derived from the same source.

4.4.5 VXlbus Interface

Operability is inferred since performing
the tests specified in this document requires a
functional VXIbus interface to control the instru­ment. Insure that the Service Request and
Shared Memory is tested. Query the module for
the version of the firmware installed.

4.4.6

Self Test

Purpose: Tests the basic integrity of the
1395 and the interface to the backplane.

Setup: Initiate a self test sequence. Verify that
the 1395 returns a result of 0. (Pass/Fail)

Commands:

*tst?

Universal Counter: HP 5334B

4.4.7 Function Output On/Off

Digital Multimeter: Datron Model 1062

Oscilloscope: Tektronix Model 2465B

RF

Voltmeter: Boonton Model 9200B

4.4.2

STANDARD TEST CONDITIONS:

Temperature: 25"C+10°C

Humidity: 10% to 90%
Altitude: Sea Level

Warm up: 1/2 Hour

Purpose: Test functionality and perfor­mance of the function output on/off control re-

lay.

Spec: >60dB isolation at lkHz

Setup: Select IkHz, 5Vpp sine. Terminate Arb
Output in 50 Ohms. Verify off amplitude is

5

5mV. (Pass/Fail)

Commands:

*rst
Volt 5

4.4.8

Trigger Count

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Purpose:

Verify the functionality and pro- trigger source. Verify Sync Marker frequency

grammability of the trigger count circuitry.

aprox 5 MHz. (Pass/Fail)

Setup: Select function sine,

1

MHz, Trigger

mode, trigger count as specified, trigger source

-

manual or bus. Select BBITS as Sync Marker
Source. Terminate Sync Marker Out into 50
Ohm. Verify specified number of cycles are com­pleted after receipt of trigger.

Set Value

--

Spec Min

Spec Max

1,048,575 1,048,575 1,048,575

Commands:

*rst
output on
freq le6
mark:sync on
mark:sync:sour bbits
init:cont off
triggersour ext
trigger:count 1048575

Internal Trigger

Select Internal as trigger source. Set trigger rate

as shown. Verify Sync Marker frequency

=

pro­grammed trigger rate. Note: For the slow trigger
rates, it may be helpful to reduce the waveform
sample rate in order to keep the waveform fre­quency and the trigger frequency within a 10:l
or 100:l ratio. This will ease the measurements.

Commands:

*rst

trace:define mike,5
trace:data mike,sin
func user
mark:sync:sour bbits
marksync on
init:cont off
triggersour ext Do External test here

triggersour int

*trg

trigger:timer 2e-7 Do Internal test here

4.4.10

Sine Amplitude Accuracy

4.4.9

Trigger Source

Purpose: Verify accuracy and linearity of

Purpose: Verify functionality and perfor-

amplitude control and gain setting components

mance of trigger sources and selection logic.

over the range covered by the 0

dB

output atten-

uator. This range is

7.5

Vp to 2.51 Vp.

Setup: On the 1395 define a 5 point sine wave­form, set sample rate to 50 MHz, set mode to

Spec:

+

1% of setting

Triggered with the trigger count set to 1. Select

BBITS as Sync Marker Source. Terminate Sync

Marker Out into 50 Ohm.

Setup: Select function sine, 600

Hz.

Measure
voltage at Arb Out terminated into 50 Ohm. Ter­mination should be accurate to at least 0.1%.

External Trigger

Programmed Programmed Spec Spec

vd

(Vrms') Min (.Vrms) Max (Vrms)

7.50 5.303 5.250 5.356

Apply a TTL level

(0.8V to 2.1V) trigger signal to

5.00

external trigger input BNC. Trigger input should

3.536 3.500 3.571

be properly terminated to ensure good wave- 2.51 1.775 1.757 1.793

form quality. Set external trigger frequency to 5
MHz and pulse width to

20nS. Select External as

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Commands:

*rst
output on
freq 600
volt 7.5
volt 5.0
volt 2.51

4.4.12

Attenuator Accuracy

Purpose: Verify accuracy of output attenu­ators.

Spec:

+I % of setting.

4.4.11 Square Amplitude Accuracy

Purpose: Verify accuracy of square function
gain setting components over the range covered
by the 0 dB output attenuator. This range is 7.5
Vp to 2.51 Vp.

Spec:

2

1% of setting

Setup: Select function Square (HFSQ), 600 Hz.
Measure voltage at Arb Out terminated into 50
Ohm. Termination should be accurate to at least

0.1%.

Programmed Spec Spec

IvD,

Min (Vrms) Max (Vrms)

7.50 7.425 7.575

5.00 4.950 5.050

2.51 2.485 2.535

Commands:

*rst
func hfsq

freq 600
output on
volt 7.5
volt 5.0

volt 2.51

Setup: Select function sine, 600

Hz.

Measure
voltage at Arb Out terminated into 50 Ohm. Ter­mination should be accurate to at least 0.1%.

Set Value

--

Spec Min Spec Max

2.000 V 1.400 Vrms 1.428 Vrms

1.000 V 0.7000 Vrms 0.7142 Vrms

0.300 V 0.2100 Vrms 0.2142 Vrms
Commands:

*rst
output on
freq 600
volt 2
volt

1

volt .3

4.4.13

DC

Offset Accuracy

Purpose:

Verify the

DC

accuracy and offset

Spec:

+

1% of setting + 5 mV

Setup: Select function DC, amplitude

OV.

Mea­sure voltage at Arb Out terminated into 50 Ohm.
Termination must be accurate to at least 0.1%.

Programmed Spec Spec

(Vdc)

Min (Vdc) Max (Vdc)

7.500 7.420 7.580

0.000 -0.005 0.005

-7.500 -7.580 -7.420

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Commands:

*rst
output on

func dc
vo1t:offset 7.5
vo1t:offset 0
vo1t:offset -7.5

4.4.14

Frequency Response

Purpose: Verify the amplitude verses fre­quency specification

Spec:

+

2% for frequencies < 5MHz, + 5% for

frequencies

2

5MHz

Setup: Select function sine, IkHz, 15Vpp. Mea­sure voltage at Arb Out terminated into 50 Ohm.
Note lkHz amplitude. Record amplitude varia-

tion at programmed frequencies relative to

lkHz

amplitude.

Spec

Freq

Relative Amp1

10 kHz

+

2%

4

MHz +2%
5MHz+5%
20 MHz+ 5

%

Commands:

*rst
output on
volt 7.5

freq le3 First measurement

freq

10e3 Next measurement

freq 4e6 Next measurement
freq 5e6 Next measurement
freq 20e6 Last measurement

4.4.15

Square Waveform Quality

Purpose:

Verify Rise/Fall times and aberra-

tions are within specification.

Spec: Rise/Fall Time

5

9.5 nS for amplitudes

>

lOVpp,

5

9

ns for amplitude 5 10

Vpp.Aberrations

5

(5% + 5mV) of peak to peak

amplitude.

Setup: Select function Square (HFSQ), 10 MHz.
Program the following amplitudes and verify
rise/fall and aberrations with the Arb Out termi­nated into 50 Ohm.

Set Spec

Spec

Value Rise /Fall Aberrations
15 Vpp

5

9.5 nS

5

755 mVpp

Commands:

*rst
output on
func hfsq
freq

10e6

volt 7.5

4.4.16

Squarewave Duty Cycle

Purpose: Verify squarewave symmetry
verses frequency.

Spec: 50

%

+

0.1 % for frequencies < 10 MHz, 50

%

+

2

%

for frequencies 2 10 MHz

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Setup: Select function Square (HFSQ), 10Vpp.
Program the following frequencies and verify
duty cycle with the Arb Out terminated into 50
Ohm

Set Value Spec Min

1

kHz 49.0

%

Commands:

*rst
output on
func hfsq
volt 5

4.4.17 Sync Marker Output

Spec Max

51.0

%

Purpose:

Verify performance of Sync Mark-

er Output circuits.

Setup: Select function sine, 10 MHz. Terminate
Sync Marker Out into 50 Ohm. Verify a valid
TTL Level.

Commands:

*rst
freq 10e6
mar1er:sync on
func user
mark:position:point jack,O

4.4.18 Position Marker Output

Purpose: Verify performance of Position
Marker Output circuits.

Setup: Define 5 point waveform, 50 MHz sam­ple rate. Set position marker at address

0 of
waveform. Terminate Position Marker Out into
50 Ohm. Verify a valid TTL Level.

Commands:

'rst

4.4.19

Clock

Output

Purpose:

Verify performance of Clock Out-

put circuits.

Setup: Set sample rate to 25

MHz.

Turn on
Clock Output BNC with the Sample clock as the
source. Terminate Clock Out into 50 Ohm. Verify

a

valid TTL Level.

Commands:

*rst
outp:clock:freq 25e6

4.4.20 Clock Input

Purpose: Verify performance of clock input
circuits.

Setup: Define 5 point waveform, clock source
external. Apply a TTL level (0.8V to 2.1V) clock
to Arb Channel Clock Input. Clock Input should
be properly terminated to ensure good wave­form quality. Set external clock frequency to 5
MHz. Terminate Sync Marker Out into 50 Ohm
and verify it's frequency

=

external clock fre-

quency divided by 5

(

1MHz). (Pass/Fail)

Commands:

*rst
trace:define bi11,5
trace:data bil1,hfsq
func user
outp on
rosc:sour ext

4.4.21 Frequency Sweep

Purpose:

Verify the functionality of the

sweep.

Setup: Setup the 1395 for a triggered sweep, 100

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sec sweep time, bus or manual trigger source.
Terminate

Arb

Out into

50

Ohm.

Monitor fre-

quency of signal on Arb Out

BNC.

Verify frequency = start frequency. (Pass/Fail)

Initiate trigger. Measure frequency after 10 sec.
Verify frequency

>

start frequency. (Pass/Fail)

Commands:

*rst
output on
freq:mode sweep
sweep:time 10
sweep:mode tres

"trg

4.5

ALIGNMENT

PROCEDURE

The procedure given in paragraph 4.5.5 requires
that the model 1395 be part of a VXI system as
described in table 4-1. The model 1395 will be
installed on a C-size VXI extender card and con­trolled by the Resource Manager. The

comput­er/display device can be the Resource Manager
(internal host in a Stand-Alone system) or an ex­ternal host connected to the Resource Manager
via the IEEE-488 (GPIB) programming bus.

WARNING

With the covers removed, low
voltage dc power supplies are

exposed. Do not be misled by

the term "low voltage". Under

adverse conditions, potentials as

low as

50

volts can cause serious

injury or death.

WARNING

With the module on an extender

card and the covers removed, no
chassis cooling air is moving
across the components. The ARB

Generator has many high-speed

digital logic devices and discrete
analog circuits which require
some cooling air for continuous
operation. Do not operate the
module in this configuration for

more than a few minutes .without
directing some cooling air across

the face of the ARB Board using
an external utility

fan.

Avoid

burns

-

do not touch components

in the module.

4.5.1 Self Calibration

The model 1395 performs a Self Calibration in
response to the SCPI

CAL

[

:

ALL

I

?

command or

to the IEEE-488.2

*

CAL?

command. The Self

Calibration performs only those steps in the

"full" Calibration procedure of paragraph 4.5.5
which are detailed in Appendix A. Self Calibra­tion steps are performed by the instrument firm­ware at any time the

operator/programmer
sends the appropriate commands following the
30 minute warm-up. Self Calibration sets up
various internal interconnections and uses inter­nal time and voltage standards to store "fresh"
Alignment Data which is used to optimize the
unit's performance accuracy. During the Self
Calibration, the unit disconnects all inputs and
outputs, and at the end of Self Calibration it re­stores its current setup.

A Self Calibration is performed just prior to run­ning the Performance Verification Procedure.
Therefore, if there is an out-of-tolerance reading,

the Self Calibration is not likely to correct it, and
the "full" Alignment Procedure in paragraph

4.5.5 should be run.

4.5.2 Semi-Automated Procedure

Model 1395 alignment is partially automated in
that it includes the Self Calibration in addition
to manual calibration steps.

Note

The completion of the alignment procedure
returns the instrument to correct alignment.

Alignment limits and tolerances are not

instrument specifications.

Instrument

speciJications are given in Section

1

of

this

Manual.

4.5.3 Preparation

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Obtain access to adjustable components

by

re-

moving the side panel

without

the address

switch cutout. Mount the module on an extend­er card, or plug it into

a

VXI chassis connector
that will allow access during calibration. Pro­vide cooling air across the face of the module us­ing the VXIbus chassis or an external utility fan.
Allow at least a 30 minute warm-up.

4.5.4

Connector Termination

When used as test points, the SYNC OUT and
PULSE OUT connectors must be terminated with
50a.

4.5.5

Alignment Procedure

The following list of test equipment is included
for reference only. Substitution of any equip­ment is allowed as long as adequate measure­ment accuracy is maintained. Test equipment
should always provide at least 5 times more
measurement accuracy than the specification of

the parameter being tested.
Only equipment that has been properly serviced

and calibrated (traceable to NIST) according to
the manufacturers specifications may be used
for calibration.

Equipment Manufacturer Model

RF

Voltmeter Boonton 9200B
Oscilloscope Tektronix 2465B
Universal Counter Hewlet

Packard

5334B

Overview

The calibration of the Model 1395 can be divided
into 3 sections. These are; manual adjustments,
self calibration and semiautomatic adjustments.
The manual and semiautomatic adjustments are
intended for alignment only during a full cali­bration cycle. The self calibration may be in­voked at any time by the user for improved
accuracy. This will allow the user to correct crit­ical parameters at the time and temperature of
use.

The manual adjustments need to be performed
prior to installation of the module cover. The re­maining calibration can be performed with all

covers installed. The self calibration may also
be used to insure functionality before installing
module cover.

In each step of the calibration there is a descrip-

tion of the remote interface commands required

to set up the instrument.

4.5.5.1

Square Wave Symmetry

The square wave symmetry adjustment is per­formed with potentiometer R509. This adjust­ment sets the threshold of a comparator
monitoring the filtered output of the Waveform
DAC. The output of the Waveform DAC is a si­nusoid from which the comparator generates a
square wave. To make the symmetry adjustment
the module must

be

installed in a VXIbus chassis

with its covers removed. With the top cover in

place, allow the unit to warm up at least 20 min­utes.

1)

Configure the module as follows:
Function: Square
Frequency:

1

MHz

Amplitude:

5

v~

Remote Commands: OUTP ON

FUNC HFSQ
FREQ 1E6
VOLT

5

2) Adjust potentiometer R509 until the square
wave symmetry is 50

O/O

+/-

0.2

%.

Note that
this can be easily done by adjusting R509 un­til the DC voltage at TP26 or TP8 is 0 volts.

4.5.5.2

Square Wave Quality

The adjustments for this parameter are R180 and

R198 located on the Main Board (1100-00-3522).
To make these adjustments the module must be
installed in a VXIbus chassis with its covers re­moved. With the top cover in place, allow the
unit to warm up at least 20 minutes.

1)

Configure the module as follows:

Function: Square
Frequency: 10 MHz
Amplitude: 5

v~

Remote Commands: OUTP ON

FUNC HFSQ
FREQ 10E6

VOLT

5

2) Adjust R180 and R198 for minimum aberra­tions while maintaining acceptable rise/fall
time. R180 will control mainly the positive

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portion of the waveform and R198 will con­trol mainly the negative portion. There will
however be some interaction. The goal of
these adjustments is a square wave with a
smooth transition from the rising and falling
edges to it's final value. The typical module
will produce rise/fall times 4.5 ns with ab-

errations

<

255 mVpp.

Set amplitude to 7.5 Vp and verify rise/fall

times

<

9 ns and aberrations < 455

mV. If
out of tolerance, readjust RIB0 and R198 then
verify performance at

5

Vp to the acceptance

test limits.

4.5.5.3 SUMBUS Driver Zero

The DC offset of the SUMBUS driver is adjusted
with potentiometer R428. This adjustment is

used to set the DC offset of the SUMBUS driver
to

0.

During this adjustment the SUMBUS driv­er is isolated from the rest of the circuits by
grounding its input from the preamplifier and
routing its output to the SUMBUS test point
across a known 25Q load. To make this adjust­ment the module must be installed in a VXIbus
chassis with its covers removed. With the top

cover in place, allow the unit to warm up at least
20 minutes.

1)

Configure the module as follows:

SUMBUS input Off

SUMBUS output Off
Remote Cmds: 0UTP:SUMB OFF

SUMB OFF

2) While measuring the DC voltage at the

SUM­BUS test point (TP29) adjust potentiometer
R428 until the voltage is less than

1

mV.

4.5.5.4 Self Calibration

This step of the calibration uses the internal DC

voltage measurement capability to bring the off­set and amplitude parameters within specifica­tion limits. For a proper calibration, the module

covers should be installed. Allow the unit to

warm up at least 20 minutes.

1) Initiate the self calibration sequence.
Remote Cmds: *CAL?

2) Verify the unit returns a zero result indicat-

ing calibration was successful. See the self
calibration description in Appendix A for an

explanation of the procedures and results

of

the self calibration.
Remote Cmds:
Remote query returns value of zero if self

calibration was successful.

A

non-zero result

indicates an self calibration failure.

4.5.5.5 SCM Null

The remaining steps of the calibration uses ex­ternal equipment to measure parameters beyond
the capabilities of the internal measurement sys­tem. The results of the external measurements

are then returned to the Model 1395 and stored
in non-volatile calibration memory.

Configure the module as follows:

Function Sine
Frequency

1

MHz

Amplitude

5

v~

Modulation Mode SCM
Remote Cmds: OUTP ON

FUNC SIN
FREQ 1E6
VOLT 5
AM:MODE SCM
AM:STATE

ON

Verify peak to peak amplitude of output sig-

nal

<

75mVpp.

If out of tolerance, query the unit for it's cur-

rent SCM zero constant. The constant will
be a decimal number between

0

and 4095.
There will be a null point in the amplitude
vs cal constant curve. The goal of this cali­bration is to find the null point.

Remote Cmds: CAL:DATA:SCMZ?

Program a new constant and measure signal

level. Iterate until amplitude is

<

75mVpp.

Remote Cmd: CAL:DATA:SCMZ

<numeric-value>

Note

Thefollowing step should usually be post­poned until the entire

semi-automatic cali-

bration

is

completed.

Store new constant

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Remote Cmd: CAL:DATA:STORE

4.5.5.6

Elliptic Filter Amplitude Flatness Correction

This calibration is intended to correct for the fre­quency response of the elliptic filter used for
sine wave generation. The procedure is to mea­sure the amplitude error at 5 frequencies and
send the appropriate correction constant to the
Model 1395. The Model 1395 will then use these
constants to set up a correction vs. frequency ta­ble in the non

-

volatile calibration memory.

The correction table is broken into 4 frequency
ranges. The ranges are DC to the frequency of
index 1; frequency of index

1

to frequency of in­dex 2; frequency of index 2 to frequency of index
3; frequency of index

3

to frequency of index 4,
frequency of index 4 to frequency of index 5.
The calibration involves determining the correc­tions at the boundaries of these ranges. Each
correction point is assigned an index number, a

frequency and a correction. The defaults are:

Index

Frequency Correction

0 DC

1.00

1

7 MHz 1.00
2 13 MHz 0.835
3 17 MHz

1.02
4 19 MHz 0.995
5 20 MHz 1.00

The default corrections are based on a sampling
of units and will not guarantee specified perfor­mance. The default range boundaries or fre­quencies usually will not need to be changed.
The corrections are what is determined from this
procedure. If acceptable performance is not
achieved, then one or more of the frequencies
may need to be modified. If this is the case, set
the index frequency in the non conforming fre­quency band to the nearest amplitude maxima
or minima. For example, suppose that after cali­bration it is determined that amplitudes in the

12 to 14 MHz frequency range do not meet speci­fication. By measuring the amplitude vs. fre­quency in that band it is determined that the
maximum amplitude is at 12 MHz. Change the

frequency of index 2 to 12 MHz. If required, the

search for the amplitude maxima or minima

should be done with the corrections turned off.

1) Configure Arb Channel module as follows:
Function Sine

Frequency 50 kHz
Amplitude 5 VP
Calibration State off
Remote Cmds: OUTP

ON

FUNC SIN
FREQ 5E4
VOLT 5
CAL:STATE OFF

2) Measure the amplitude at 50 kHz and use as
the reference amplitude.

3)

Measure the amplitude error at 7 MHz rela-

tive to 50 kHz. For best results this data
point should use the default correction of

1.00 unless it's error is

>

2

%.

If error is > 2%

send the appropriate correction to the Model

1395.

Example:

7

MHz

amplitude is 1.05 times

higher than 50

kHz

amplitude. Error is 0.05

(5

%).

Correction factor is 1.00/1.05 or

-0.95.

Remote Cmds: FREQ 7E6

CAL:DATA:AMPL:AFC
1,7E6,(correction factor)

4) Measure the amplitude error at 13 MHz rela­tive to 50 kHz. Send the appropriate correc­tion to the Model 1395.

Remote Cmds: FREQ

13E6
CAL:DATA:AMPL:AFC
2,13E6,(correction factor)

5) Measure the amplitude error at 17 MHz rela­tive to 50 kHz. Send the appropriate correc­tion to the Model 1395.

Remote Cmds: FREQ 17E6

CAL:DATA:AMPL:AFC
3,17E6,(correction factor)

6) Measure the amplitude error at 19 MHz rela­tive to 50 kHz. Send the appropriate correc­tion to the Model 1395.

Remote Cmds: FREQ 19E6

CAL:DATA:AMPL:AFC
4,19E6,(correction factor)

7) Measure the amplitude error at 20 MHz rela­tive to 50 kHz. Send the appropriate correc-

tion to the Model 1395.
Remote Cmds:

FREQ

20E6

CAL:DATA:AMPL:AFC

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-

5,20E6,(correction factor)

8)

Store calibration constants. Turn calibration

--

state on.

-

Remote Cmds: CAL:DATA:STORE

CAL:STATE

ON

--

This completes the Calibration Procedure

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Parts

and

Schematics

Section

5

5.1

DRAWINGS

The following schematics and assembly draw­ings are in the arrangement shown below.

5.2

ERRATA

Under Wavetek's product improvement pro-

gram, the latest electronic designs and circuits

are incorporated into each Wavetek instrument

as quickly as development and testing permit.
Because of the time needed to compose and
print instruction manuals, it is not always possi­ble to include the most recent changes in the ini­tial printing. Whenever this occurs, errata pages
are prepared to summarize the changes made

DRAWING

Outline Drawing
Instrument Schematic
Instrument Assembly Drawing
Instrument Parts List (Standard)
Instrument Parts List (wloption 001)

50 MHz VXI ARB Main Board Schematic
50 MHz VXI ARB Main Board Assembly
50 MHz VXI ARB Main Board Parts List

ARB Engine Board Schematic
ARB

Engine Board Assembly Drawing
ARB Engine Board Parts List (Standard)
ARB Engine Board Parts List (wloption 001)

Spares Kit Parts List

and are inserted inside the shipping carton with
this manual. If no such pages exist, the manual
is correct

as

printed.

5.3

ORDERING PARTS

When ordering spare parts, please specify part
number, circuit reference, board, serial number

of unit and, if applicable, the function per­formed.

Note

An assembly drawing number is not neces-

sarily the assembly part number. However,
the assembly parts list number is the assem­bly part number.

DRAWING NUMBER

PARTS

AND

SCHEMATICS

5-1

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LEFERENCE DESIGNATORS

ZEF

WA--K

PARTS

LIST

'ART DESCRIPTION ORIG-MFGR-PART-NO

ES,

MF, 1/4W, I%, 182

RN60D1820F

HM

LES,MFLM 115 OHM 1% RN55C1150F
./8W T0

I

IES,MFLM 169

OHM

1% RN55C1690F

./10W TZ

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VD 50

MHZ

VXI ARB

1101-00-3628

aIN

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;CHEMATIC,ARB MAIN B 1104-00-3628

!

RES,NETWORK, 10K OHM 698-3-R10K-F

1%

x8

I

CAP,CER,COG, 50V, 5%
120 PF,

.1

LS

CAP,CER,COG, 50V, 5%
150 PF,

.1

LS

MHZ

ARB MAIN BD

I

ASSEMBLY

NO.

1100-00-3628-02

)ALE

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DALE
UNCEM

UNCEM

WVTK

WVTK
UMCEl

HYME(

BECK

AVX

AVX

AVX

AVX

AVX

CRL

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1

-

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-

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PART DESCRIPTION

:AP, CER
IISK,1.5PF,lKV,TEMP
:OMp

:AP

,

CER, COG, 50V, 5%,

.8 PF,

.1

LS

AP,CER,COG, 50V, 5%,
.80 PF,

.1

LS

:AP,CER,COG, 50V, 5%,
!20 PF,

.1

LS
:AP CER MON Z.7PF 50\
:AP,CER,COG, 50V, 5%,

$90

PF,

.1

LS

:AP,ELECT,100MF,35V
ZADIAL LEAD,SP .20

LAP ,ALUM
ELECT,470MF,Z0%,16V,I
4DAIL .Z" SP,lBMM

3IAxlZ. 5MM HT
CAP, MET

POLY,.001MF,100V
CAP .MET

POLYS,

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lMF, l0%,63V,

.:

"LS

CAP, MET
POLYS,@.@lMF,+-20%,6
V,

.1IN LS

CAP,TANT, 6.8MF, 20V
20%, SMD EIA 6032
CASE

CAP, SMD CER NPO
100PF/50V

CAP,CER, 180 PF,
5%,NPO,SMD 1206 CASE

MFGR

-

SIC

\VX

4VX

4vx

4RCO
4VX

9VX

AVX

NIC

UNCOI

UNCOI

WEST

WIMA

WIMA

WIMA

WEST

SPRAI
NEMCI

KEME'

KEME'

SPRAl
AVX

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NO.

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1395 50

HZ

VXI ARB

REFERENCE DESIGNATORS

C156 C315

C88 C90

C87

C35 C44 C89 C92

CZ18

C96

C123 C93

C316 C91

C11 C13 C3 C5 C63 C7 C9

C106 ClZl C126 C132 C137
C147 C160 C168 C169 C188
C197 C198 C71

C6Z C64

C166

C50

CZ0l C37

C36 C38 C49

C39 C43

C48 C51

CZ15 C56
C319 C322 C325 C327

C330

C320 C321 C323 C324 C326

C328

C329 C331 C332 C333
C335 C338 C339 C354 C356
C364

C334
C355

I

PAGE 2

I

WAVETEK

PARTS

LIST

WAVETEK NO.

,500-01-5507

TITLE

MODEL

REV

C

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--

EFERENCE DESIGNATORS

rP10 TPll TP15 TP27 TP3
rP30 TP5 fP9

rP1 TP16 TP17 TP18 TP19 TI
rP20 TPZl TPZZ TP23 TP24
rPZ5 TPZ6 TP29 TP4 TP6 TP'
rP8

d

3

2

WAVETEK

PARTS LIST

7

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C

5

F

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Pi

7

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A

TITLE

PCA, 50

PART DESCRIPTION
AP,CER, 8.2PF,

5%,

;0V, NPO, SMD 1206 CAS
'CB,50MHZ VXI ARB

MIN REF: SPEC
1888-00-0455 REV E

[NDUCTOR, 99 NH ,5%,

Qf

[NDUCTOR,FIXED, 345
1H

tNDUCTOR,FIXED, 475
?H

INDUCTOR, 117 nH,
F8, AT 25 MHz FREQ

CONN, BNC(PC)
HEAD, 26 PIN,WAL

ROW, 0.025 SQ
PIN,W/SHRD

HEAD, 40 PIN,WAL
ROW, 0.025 SQ
PIN,W/SHRD

SOCKET,

40

PIN, ST, LO1

INSERT
SOCKET,20 PIN,ST,LO1

INSERT
SOCKET,36 PIN,ST,LO

INSERT
TEST POINT,BLK,PC

TEST POINT,RED,PC

TRANSIPAD

HEATSINK,TO-5 PKG
HOLE PLUG,BINDER

HEAD,NTRAL NYLON

RELAY,

1

FORMC,5V,.312H,.296
RELAY, 2 FORM C, 5V

LOW PROFILE

POT,TOP TRIM,Z@T,ZQ

OHM

HZ ARB MAIN BD

ZOILC 1800-00-0050
COILC 1800-00-0056

COILC 1800-00-0057

COILC 1800-00-0065

AMP 2100-01-0019
SAM 2100-02-0308

SAM 2100-02-0309

SAM 2100-03-0000

SAM 2100-03-0001

SAM 2100-03-0006

CDMPO 2100-04-0054

COMPO 2106-04-0055

BIVAR 2800-11-0003
IERC 2800-11-0042
FASTX 2800-35-0009

ARM 4500-00-0033

AROMT 4500-00-0034

AROMT 4500-00-0038

BECK 4609-90-0005
BECK 4609-90-0024

STKPL 4700-25-0100
STKPL 4700-25-0220
STKPL 4700-25-0279
STKPL 4700-25-0829

ASSEMBLY

NO.

1100-00-3628-02

PAGE 3

REV

C

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