HP 8081A Operating And Service Manual

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This manual may contain references to HP or Hewlett-Packard. Please note that
Hewlett-Packard's former test and measurement, semiconductor products and
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(

Flio-

HEWLETT

a:~

PACKARD

OPERATING

AND

SERVICE MANUAL

300MHz

RATE GENERATOR

MODULE

S08iA

PART OF THE 8080 HIGH FREQUENCY

PULSE GENERATOR SYSTEM

SERIAL NUMBERS

This manual applies

directly

to instrument serial number

1604G 00101

For instruments

with

lower serial numbers, refertothe

backdating

informationinSection 8ofthis module

manual.

For instruments

with

higher serial numbers, refertothe

Manual

Change

sheets

at the endofthis module manual.

0265

COPYRIGHT

HEWLETT·PACKARD

GMBH

1975

'------------

703

BOBLINGEN,

HERRENBERGER

STR. 110, WEST

GERMANY.

--.J

MANUAL

PART NO.

08081-90001

MICROFICHE

PART NO.

08081-90501

Printed in

West

Germany

CERTIFICATION

The Hewlett-Packard

Company

certifies that this

instrument

was

thoroughly

tested

and

inspected

and

foundtomeet

its

published

specifications when

it

was shipped from

the

factory. The Hewlett-Packard

Company

further

certifies that its calibration

measurements

are traceabletothe

U.S. National

Bureau

of

Standards to the

extent

allowed by

the

Bureau'$ calibration

facilities, or to the calibration

facilities

of

other

International Standards

Organization

mem

bers.

WARRANTY

AND

ASSISTANCE

This

Hewlett-Packard

productiswarranted

against

defectsinmaterials

and

workmanship.

This

warranty

applies

for

one

year

from

the

dateofdelivpry.

Hewlett-Packard

will

repairorreplace

products

which

provetobe defpctiVl'

during

the

warranty

period

provided

they

are

returned

to

Hewlett-Packard.

No otht-'r

warranty

is

expn'sspd

or

implied.

We

are

not

liahle for

consequential

damages.

Service

contracts

or

clistonwr

assistancl'

agrel'nwnls

are

availabk

for

Ih'wlt:'tt-

Packard

producl.'i

thal

require

maintenance

a.nd

repairon-sitl'.

For

any

assislann"

conlat'l

your

nearpst

Hewlelt-Packard

Sales

and

Service

Offiee. Addresses are

providedatthe

backofthis

manual.

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

ListofContents/Tables/Illustrations

CONTENTS

Page

Section 5 Adjustments

5-1

Introductio n

1-1

Specifications

1-1

Safety Considerations

1-1

Instruments CoveredByManual

1-1

Description

1-1

Options

1-2

Equipment Required But Not Supplied .

1-2

Equ ipment Available

1-2

Recommended Test Equipment

1-2

Introduction

6-1

Abbreviations

6-1

Replaceable Parts

6-1

Ordering Information

6-1

Introduction

5-1

Safety Considerations

5-1

Test Equipment Required

5-1

Alignment Tool

5-1

Performance Checks

5-1

Related Adjustments

5-1

Duty Cycle and Frequency Adjustments.

5-2

Section 1

1-1
1-4
1-6

1-9

1-11
1-14
1-16
1-18
1-20

Section 2

General Information

Installation

1-1

2-1

5-1
5-3

5-9

5-11
5-13
5-15
5-18

Section 6

6-1
6-3
6-5
6-8

Replaceable Parts

6-1

Introduction

7-1

Recommended Test Equipment

7-1

2-1
2-3
2-5
2-6
2-8
2-10

Introduction

2-1

Initial Inspection

2-1

Preparation For

Use

2-1

Installation in

8080A

Mainframe

2-1

Operating Environment.

2-1

Storage and

Shipment

2-1

Section 7

7-1
7-3

Service

7-1

Section 3 Operation

3-1

TABLES

3-1
3-3
3-5
3-7

3-9

3-12
3-21
3-24
3-26

.3-28

3-36

3-40

Introduction

3-1

Panel Features

3-1

Operator's Checks

3-1

Operating Instructions

3-1

Operator's Checks

3-1

Initial Control Settings

3-1

Operating Instructions

3-3

Initial Control Settings

3-3

Normal Mode

3-3

Trigger Mode

3-3

External Gate Mode

3-4

Internal Gate Mode

3-4

Table

1-1
1-2
4-1
6-1

6-2
7-1
7-2

Figure

Page

Recommended Test Equipment

1-2

Specifications

1-3

Performance Test Record

4-7

Abbreviations for Replaceable

Parts List

6-2

Replaceable Parts

6-5

Reference Designators

7-1

Schematic Diagram Symbols

7-2

I

LLUSTRA

TIONS

Page

Section 4 Performance Tests

4-1

4-1
4-3
4-5
4-7
4-8

4-9

4-10
4-11
4-12
4-13

Introduction

4-1

Equipment Required

4-1

Test Record

4-1

Repetition Rate

Test

4-1

Trigger

Output

Test

4-2

External Trigger Mode (Slow)

Test

4-2

External Gate Mode (Slow) Test

4-3

Manual Function

Test

4-4

External Trigger Mode (Fast)

Test

4-5

External Gate Mode (Fast) Test

4-5

1-1

1-2
3-1
3-2

3-3

3-4

3-5

8081 A

300

MHz

Rate Generator

Module and Supplied Accessories

1-0

Serial Number Plate

1-1

8081 A Controls and Connectors

3-0

Test

Set

for Operator's Checks

3-2
Suggested Equipment Setup for
Operating Instructions

3-2

Rate Generator

OutputinTrigger

Mode

3-3

Rate Generator

OutputinExternal

Gate Mode

3-4

ListofIllustrations/Schematic Diagrams

ILLUSTRATIONS

Figure

4-1
4-2

4-3

4-4

4-5

4-6

4-7

5-1

5-2

6-1

Page

Repetition Rate Test Setup

4-1

Trigger

Output

Test Setup

4-2

External Trigger Mode (Slow)

Test Setup

4-2

External Gate Mode (Slow) Test

Setup

4-3

Manual Function Test

Setup

4-4

External Trigger Mode (Fast) Test

Setup

4-5

External Gate Mode (Fast) Test

Setup.

4-5

Duty Cycle Adjustment Test

Setup

5-2

Frequency Adjustment Test

Setup

5-2

8081 A Replaceable Parts..,

6-4

SCHEMATIC DIAGRAMS

Diagram

Page

1
2

3

Control Board A1
300

MHz

Rate Generator Board A2

Distribution Board

A3

7-9

7-11
7-12

SCREWS

CABLE

808TA

Figure

1-1.

8081 A 300 MHz

Rate

Generator Module

and

Suppl

ied

Accessories.

,-------------------------------SECTION

1

"--~----------------------

GENERAL INFORMATION

1-1

INTRODUCTION

1-2

This

Operating

and

Service manual

contains

information

requiredtoinstall,

operate,

test,

adjust

and

service

the

Hewlett-Packard Model 8081 A

300

MHz

Rate

Generator

module.

Figure

1-1

shows

the

module

and

accessories supplied.

This

section

covers

instrument

identification,

descrip-

tion,

accessories, specifications,

and

other

basic informa-

tion.

1-3

A

microfiche

versionofthis manualisavai-

lable

on

4 x 6 inch

microfilm

transparencies

(order num-

ber

on

title

page). Each

microfiche

containsupto

60

photo-duplicatesofthe

manual pages.

The

microfiche

package also includes

the

latest

Manual Changes supple-

ment

as well as all

pertinent

Service Notes.

1-4

SPECIFICATIONS

1-5

I

nstrument

specifications

are

listed in

table

1-2.

These

specifications

are

the

performance

standardorlimits

against

which

the

instrumentistested.

is

a significant changetothe

instrument.

The

last five

digits are assigned

to

instruments

sequentially.

The

con-

tentsofthis manual

apply

directlytothe

instrument

serial

number

quotedonthe

title

page.

For

instruments

with

lower serial numbers, refertothe

backdating

infor-

mationinSection8of

this

module

manual.

For

instru-

ments

with

higher serial numbers, refertothe

Manual

Change

sheetsatthe

endofthis

module

manual. In addi-

tiontochange

information,

the

Manual Change

sheets

may

contain

information

for correcting

errorsinthe

manual.Tokeep

this

manual as

up-to-date

and

accurate

as possible, Hewlett-Packard

recommends

that

you

periodically

request

the

latest Manual Change supple-

ment.

The

supplement

for

this

manualisidentified

with

this

manual's

print

date

and

part

number,

bothofwhich

appearonthis

module

manual's

title

page. Complimen-

tary

copiesofthe

supplement

are

available from

Hewlett-Packard.

HEWLETT-PACKARD

GmbH

[1536G00062

]

BOBLINGEN

..

Figure

1-1.

Serial Number Plate

1-6

SAFETY CONSIDERATIONS

1-11

DESCRIPTION

1-7

The

Model 8081 Aisa

Safety

Class 1 instru-

ment

(it has an

exposed

metal chassis

thatisconnected

to

earth

via

the

8080A

system

mainframe). This instru-

ment

has been designed

accordingtointernational

safety

standards

and

has

been

supplied in a safe

condition.

1-8

This

operating

and

service manual

contains

information,

cautions

and

warnings

which

must

be fol-

lowed

by

the

usertoensure

safe

operation

andtomain-

tain

the

instrument

in a safe

condition.

1-9

INSTRUMENTS COVERED BY MANUAL

1-10

Attachedtothe

insideofthe

instrument

side

frameisa serial

number

plate (figu re

1-1).

The

first

four

digitsofthe

serial nu

mber

0 nly change

when

there

1-12

The

Model

8081Aisa

0-300

MHz Rate

Generator

module

designedtoprovide a clock

source

for

another

8080

system

module.

The

8081 A has four

operating

modes:

Normal

Trigger

External Gate
Internal

Gate

In Normal mode,

the

rate

generatorisfree-runningatthe

repetition

rate

selected by

the

rate controls.InTrigger

mode,

the

rate

generatorisbypassed

and

thepuIse

outputismerely a

shaped

versionofa pulse

input

from

eitheranexternal

sou rceora manual

pushbutton.

In

External

Gate

Mode,

the

rate

generator

outputisgated

Mainframeisrequired.

The

8080A

mainframe provides

housing and power supplies for

the

8081

A.

by a gate pulse

from

an external sourceora manual

pushbutton.

Internal Gate

mode

can

only

be useed with

an

8084A

Word

Generator

module.

The

trigger slope

polarity

and

threshold

levelofexternal gate/trigger

in-

putsisadjustable.

1-18

EQUIPMENT

AVAILABLE

1-13

The power supplies

for

the

8081 A are pro-

vided by

the

8080A

Mainframe.

1-15

The

only

option

for

the

8081 A Rate Gener-

atorisa second

copyofthe

operating

and service

manual

which

canbeobtained

by ordering

option

910.

1-19

The

8081 Aisone

of a

complete

range

of

rep. rate, timing and

output

modules

that

form

the

8080

high frequency pulse generator system. Repeti-

tion

rates range from

0-1

GHz

and

the

modules are

interchangeable

to

enable youtopurchase a system

exactly tailoredtoyour

requirements.

1-14

OPTIONS

1-20

RECOMMENDED TEST EQUIPMENT

1-16

1-17

EQUIPMENT REQUIRED BUT NOT

SUPPLIED

To

operate

the

8081 A module, an

8080A

1-21

Equipment requiredtomaintain

the

8081 A

is

listedinTable

1-1.

Other

equipment

canbesubsti-

tuted

if it meetsorexceeds

the

critical specifications

Iisted

in

the

table.

Table

1-1.

Recommended

Test

Equi

pment

Instrument

Critical Specification

Recommended Model

Used

in

Mainframe

HP

8080A

Performance Tests,
Adjustments

Electronic

Counter

upto350

MHz

frequency

HP

5345A

Performance Tests,
Adjustments

Sampling Oscilloscope >

300

MHz

bandwidth;

HP

182C with

Performance Tests,

upto200

mV/div sensitivity;

HP

1810A

plug-in

Adjustments

upto0.5

ns/div sweep speed;

50

ohm

input

impedance

Real

Time

Oscilloscope

up

to1MHz

bandwidth;

HP

182C with Performance Tests

upto1 V/div sensitivity;

HP

1804A

and

upto10 Ils/divsweep speed;

HP

1821 A plug-ins

four

input

channels

Oscillator

up

to

10KHz

frequency;

HP

651 B Performance Tests

up

to

1 V

RMS

amplitude;

50

ohm

output

impedance

Pulse

Generator

upto250

MHz

frequency;

HP

8082A

Performance Tests

2 ns pulse width;

0.5

V

amplitude; positive-polarity;

50

ohm

output

impedance;

square wave facility.

50

ohm

Feedthrough

HP

10100C

Performance Tests

Termination

50

ohm

Tee

Connector

HP

1250-0781

Performance

Tests

Model

8081A

-------------------------------1-3

Table

1-2.

Specifications

TIMING

Repetition

rate:

Period

jitter:

EXTERNAL

INPUTS

Repetition

rate:

Trigger

mode:

Gate

mode:

Input

impedance:
Trigger level:
Sensitivity:
Slope:
Max.

input

voltage:

INTERNAL

GATE INPUT

Gate

duration:

Input

impedance:

Amplitude:

High level:

Max

input

voltage:

EXTERNAL

TRIGGER OUTPUT

Amplitude:
High level:
Duty

cycle:

Output

impedance:

Transition

time

(10%to90%):

Max.

external

voltage:

INTERNAL

OUTPUT

Fan-out*:
Amplitude:
High level:
Duty

cycle:

Output

impedance:

Transition

time

(10%to90%):

Max.

external

voltage:

OPERATING MODES

Norm:
External

trigger:

External gate:
Internal

gate:

Manual:

OPTION 910
SIZE

10Hzto

300

MHzin8 ranges

~

0.1 % ± 50 psec

o

to

300

MHz, pulse width;;;'

1,7

ns

gateonduration>1periodofint

rep rate,

gate

off

duration>

1 period +

10

ns

50 n typical

-lV

to

+ 1V

200

mV

p-p

neg/pas

selectable

±6V

on>

10

ns,

off>20ns

50 n typical

~

500

mV

p-p

OV±100mV

±lV

~

500

mV

p-p

OV±100

mV

50% ± 10%

50

n typical

~

1.2

ns

±2V

1

~

500

mV

p-p

OV±100

mV

50% ± 10%

50

n typical

~

1.2

ns

±2V

Repetition

rateisdeterminedbyfront

panel

controls.

Repetition

rateiscontrolled

externally.

Shaped

input

signalisoutputatboth

internal

and

external trigger

outputs.

Gate signal

turns

repetition

rate

generatoronsynchronously.

External

inputisdisconnected.

Generatorisgated

through

internal

gate

input.

All

external

functions

can

be triggered

manuallybypressing

a

pushbutton.

Add itional

instrument

operating

and

service manual.

Quarter

mainframe width

* Fan-out: max.

numberof8080

system

modules

which can be driven

UPDATE A NOV

76

.-----------------------------

SECTION 2

INSTALLATION

2-1

INTRODUCTION

2. Remove

the

upper

two

feet

from

the

rear

of

the

BOBOA

mainframe.

2-2

This

section

provides installation instruc-

tions

for

the

Model

BOB1A300

MHz Rate

Generator

module. It also includes

information

about

initial inspec-

tion

and

damage

claims,

preparation

for

use,

and

packag-

ing,

storage

and

shipment.

2-3

INITIAL

INSPECTION

2-4

Inspect

the

shipping

container

for

damage.

If

the

containerorcushioning

materialisdamaged,

it

shouldbekept

until

the

contentsofthe

shipment

have

been

checked

for

completeness

and

the

instrument

has

been

checked

mechanically

and

electrically.

The

con-

tentsofthe

shipment

shouIdbeasshown

in Figure

1-1.

Procedures

for

checking

the

electrical

operation

are

given in

Section

3. If

the

contents

are

incomplete,

if

thereismechanical

damageordefects,orif

the

8081

A

does

not

pass

the

operator's

checks,

notify

the

nearest

Hewlen-Packard

Sales/Service office. If

the

shipping

containerisdamaged,orthe

cushioning

material

shows

signsofstress,

notify

the

carrieraswell as

the

Hewlett-

Packard

office. Keep

the

shipping

materials

for

carrier's

inspection.

TheHPoffice

will

arrange

for

repairorrepla-

cement

without

waiting

for

claim

settlement.

2-5

PREPARATION FOR

USE

2-6

Installation in

8080A

Mainframe

ICAUTION]

The

following

installation

procedure

must

onlybecarried

outbyqual ified service

personnel.

3.

Remove

the

80BOA

mainframe

top

cover.

4. Insert

the

BOB1

A in

the

required

posi-

tioninthe

BOBOA

mainframe

(there

are

no

electrical

limitationsonthe

position).

5.

Secure

the

80B1 Atothe

8080A

main-

frame

using

the

two

screws provided.

6.

Connect

the

internal coaxial

cable

from

the

8081 Atothe

word

generator,

delay,

output

amplifier

modulesorto

remote

equipment

as required.

Connections

are

Internal

Output

and

Internal Gate. A con-

necting

cable

for

the

Internal

Output

is

supplied.

7. Replace

the

BOBOA

mainframe

top

cover.

B.

Replace

the

two

feetonthe

rearofthe

8080A

mainframe.

2-8

Operating Environment

2-9

The

8081

A will

operate

within

specifications

when

the

ambient

temperatureisbetween

OOC

and

550C.

2-7

To

operate

the

BOB1

A, it

must

firstbeinstal-

led in

an

BOBOA

Mainframeasfollows:

2-10

Storage and Shipment.

1.

Switch

the

mainframe

LINE

OFF/ON

switchtoOFF.

Disconnect

the

power

supply

cable

from

the

rearofthe

8080A

main-

frame.

2-11

The

BOB1Acanbestoredorshippedattem-

peratures

between

-40

o

C

and

750C.

The

instrument

should

be

protected

from

temperature

extremes

which

cause

con-

densation

within

the

instrument.

2-12

If

the

instrumentistobeshippedtoa

Hewlett-Packard

Sales/Service Office,

attachatag

show-

ing

owner,

return

address,

model

number

and

full serial

number

and

the

typeofservice required.

The

original

shipping

carton

and

packaging material

maybere-usable

but

the

Hewlett-Packard

Sales/Service

office

will also

provide

information

and

recommendationsonmaterials

tobeusedifthe

original

packingisnot

available

or

re-usable. General

instructions

for

re-packing are as fol-

lows:

1.

Wrap

instrument

in heavy

paperorplastic

2. Use

strong

shipping

container.

A double-

wall

carton

madeof350-poundtest

material

is

adequate.

3.

Use

enough

shock-absorbing

material (3 (

to

4 inch layer)

around

all sidesofinstru-

menttoprovide

firm

cushion

and

prevent

movement

inside

container.

Protect

control

panel

with

cardboard.

4.

Seal

shipping

container

securely.

5.

Mark shipping

container

FRAG I

LE

to

encourage

careful

handling.

6.

In

any

correspondence,

refertoinstru-

mentbymodel

number

and

full serial num-

ber.

RATE

•

--NHI.-

-k.ti::r-

-"'1:---

300-100-10'"•-100-10

- 1

-100-10

1

. 3 3 - 10 • 1 -1·10 -,-1~10-\00

PERIOD

VERNIER

2

'f)(T

tNPU1

l.fVEL

GATE !

/::'~

NORM TRIG EXT

tNt

,

...

,

3

_iii_iii

-IV

.,v

4

====="~=

5..

~AN

6.

=

EXT

INPUT TRIGGER OUTPUT(-)

o EXT INPUT LEVEL

control:

determines

the

threshold

voltageofthe

external

trigger input.

Adjustable

from-1Vto+1

V.

@ NEG-POS-MAN switch:

for

selecting

the

slope

polarity

and/or

sourceofexternal trigger signals.

In

the

POS

and

NEG positions, signals

are

appl ied

via

the

EXT INPUT

connector.Inthe

MAN posi-

tion,

the

MAN

pushbuttonisused as

the

trigger.

G) RATE switch:

for

selecting

the

rangeofpulse

repetition

rate.

G Rate

VERNIER:

for

continuous

adjustmentofthe

repetition

rate

within

the

range selectedonthe

RATE switch. Clockwise

rotation

increases

the

pulse

period

(reduces

the

rate).InTRIGGER

mode,

the

rate

controls

have no effect.

o Mode

switch:

for

selecting

the

modeofoperation

of

the

rate

generator:

NORM-

rate

generator

free-runningatselected

repetition

rate.
TRIG-

rate

generator

outputisshaped

versionofinput.

Inputiseither

via

the

MAN

pushbuttonoran

external

signal

into

the

EXT INPUT

connector.

EXT

GATE-

gate

signal

turns

rate

generatoronsynchronously.

Repetition

rate

as selectedonrate

controls.

Gate

'iignal

either

via

the

MAN

pushbuttonorthe

EXT

INPUT

connector.

Max. gate

frequency

150

MHz.

INT

GATE-

external

inputisdisconnected.

Gate

signalispro-

vided

internallybythe

word

generator

module

and

Figure

3-1.

8081 A Controls and Connectors

(~)

turns

the

rate

generatoronsynchronously.

Repeti-

tion

rate as selectedonthe

rate controls.

MAN

pushbutton:

for generat;ng

external

trigger

signals

wheninTRIG

and

EXT GATE modes.

The

NEG-POS-MAN

switch

must

be in

the

MAN

posi-

tion.

EXT INPUT

connector:

DC

coupled

input

to

which

external trigger/gate signals

are

applied.

Input

impedanceis50

ohms.

Maximum

input

level

;s

± 6V.

TRIGGER

OUTPUT

connector:

provides negative

output

pulses in all

modesofoperation.InTRIG.

mode

the

output

pulses

are

relatedtothe

trigger

input

and

not

the

repetion

rate

generator. Maxi-

mum

external

voltage;s± 2V.

SECTION 3

J

'-----------------------------

OPERATION

3-1

INTRODUCTION

3-12

Initial Control Settings

3-2

This operating section explains the

function

of

the controls and connectors and describes

the

opera-

tors checks and

typical

operatingmodesofthe 8081 A

300

MHz Rate Generator module.

3-3

Panel Features

3-4

Front

panel controls and connectors

are

shown in figure

3-1.

Description numbers match the

numbers on the illustration.

SOSl

A:

1

RATE

range switch

300-100

MHz

2 Rate VERN IER

CCW

3 Mode switch NORM

5 NEG-POS-MAN switch

MAN

Oscilloscope:
Sensitivity

100mV/div

Trigger Channel A

Timebase EXPANDED, 1ns/div

3-5

Operator's Checks

3-13

The

repetition

rateofthe

output

should

be

approximately 300 MHz.

3-6

Use

the

Operator's Checks (paragraph

3-91

to

verify

that

the

SOSlAis

functioning

correctly. The

SOSl

A mustbeinstalled inanSOSOA

Mainframe

for

these checks. Thusitis

importanttoremember

that

any

fault

thatisfound

maybein the

BOSl

A Rate Generator

or

the

80S0A

Mainframe.Ifthe mai nframeissuspected,

carry

out

the

SOSOA

Performance Checks.

3-7

Operating Instructions

3-8

The Operating Instructions (paragraph

3-21

I consist

of

a numberofprocedures

that

explain in

detail the

functionofeachofthe

80S1

A controls.

All

operating modes are described. However, 1nternal Gate

mode

can

onlybeusedifan

8084A

300 MHz Word

Generator moduleisavai

lable.

3-9

OPERATOR'S CHECKS

3-10

The test

set

for

the Operator's Checksisas

shown in figure

3-2.

The 8081 A Rate Generator mo-

dule must

be

mounted inanS080A Mainframe.

3-11

Set theLINE switch 9 on the

8080A

Main-

frame to ON.

3-14

Turn

the

rate

VERNIER2fully

clockwise.

The repetition rate should

be

approximately 100 MHz.

3-15

Repeat repetition rate checks

for

RATE

ranges

100-10

MHz and

10-1

MHz at the

CCW

and

CW

positionsofthe rate

VERNIER.

The

repetition

rates

should

be

approximatelyasshown on

the

RATE

range

switch.

3-16

Switch

off

the oscilloscope. Replace the

oscilloscope sampling

plug-in

with

real

time

dual channel

vertical

and

timebase plug-ins. Reconnect

the

TRIGGER

OUTPUT 8tothe channel A

input

and switch on the

osciIloscope.

3-17

Repeat repetition rate checks

for

RATE

ranges

1 MHz

-100

KHz,

100-10

KHz,

10-1

KHz,

1

KHz-l00

Hz

and

100-10

Hz at the

CCW

and

CW

positionsofthe rate VE RNI

ER.

The repetition rates

shouldbeapproximatelyasshown on the RATE

range

switch.

3-18

Set

BOB1A

mode

s'.'vitch3toTRIGand

press

the

MAN

pushbutton 4

several

times.

3-19

Output

shouldgohigh when

buttonispres-

sed

and

low

when

buttonisreleased.

8080A
MAINFRAME

9

RATE

,--MH.--

-kH:r-

-Hl-

300-100-10

- 1

-100-10

- 1

-100

...

10

1

J~-

IU

- I - • -

I1J

- , . t -

11)-

iL'.l'J

P

'RIOI>

GAlE

t~OR"

HUG

EXT INT

VERN1£R

EXT INPUT

LEVEL

ascI

LLOSCOPE
WITH 1 GHz
SAMPLING

PLUG-IN

D

CH

A

50

OHM

COAXIAL

CABLE

Figure

3-2.

Test Set

for

Operator's Checks

NEG

pOs

ro\AN---~~

OSCI

LLOSCOPE

D

VERNIER

EXT

H4PUT

LEVEl

2

-,

GAtE

NQR,lOI

TRIO EXT

fN:r

J J - t - 1 - 1 -

~[JI

- I - 1

-'

·1

RATE

J

--I\lH.--

-kHl-

-H.;z;-

~O-100-'O

- 1 -

toO

-10

-~-100

- 10

. .

1

9

PULSE

GENERATOR

-------0---0

- - - - -

0-

--- - -

OUTPUT

500HM
TEE

50 OHM
COAXIAL
CABLES

DUAL

TIMEBASE

CHANNE

L PLUG·I N

VERTICAL

EXT

PLUG·I N INPUT

o

00

L....-

CH. -

CH.----'

A B

Figure

3-3.

Suggested Equipment Setup

for

Operating Instructions

3-27

In

Normal mode,

the

repetition

rate genera-

torisfree-runningatthe

frequency

setonthe

rate

con·

trois.

The

pulse

outputisthe

sameason

the

oscilloscope

(the

trigger

outputisidenticaltothe

pulse

output).

The

pulse

duty

cycleis40-60%.

3-20

Set

BOB1Amode

switch 3toEXT. GATE

and

press

the

MAN

pushbutton.

The

repetition

rate

should

start

when

the

buttonispressed and

stop

when

the

buttonisreleased. When

the

buttonispressed,i.e.

when

the

gate opens,

the

first pulse should always

start

at

the

beginning. However, when

the

buttonisreleased,

i.e.the

gate closes,

the

last pulse may be

cut

short.

3-26

Normal Mode.

3-21

OPERATING

INSTRUCTIONS

3-28

Trigger Mode

3-22

A suggested

equipment

setup

for

the

Operat-

ing

Instructionsisshown in figure

3-3.

The

B081 A Rate

Generator

mustbemounted

in an

BOBOA

Mainframe.

The

following

procedureisdesigned

to

give a full

understandingofthe

functionofeach

of

the

8081 A

operating

modes.

3-23

Set

the

LINE switchonthe

8080A

Main-

frametoON.

3-29

In

TRIGGER

mode,

the

repetition

rate

of

the

outputisindependentofthe

internal

repetition

rate

generator.

The

output

is,

in fact, a pulse-shaped version

of

the

input

signal.

The

input

can be

either

external via

the

EXT INPUT

(-j)

or

local using

the

MAN

pushbut-

ton

®.

For external triggering, an external signal source

is

required.

The

test

setisas

showninfigure

3-3.

The

changes in

control

settings areasfollows.

3-24

Initial

Control Settings

8081A

CD

RATE range switch 1

MHz-100

KHz

~

Rate

VERNIER

CCW

~

Mode switch NORM

@ EXT INPUT LEVEL

+1

V

@ NEG-paS-MAN switch

pas
Oscilloscope:
Timebase

2 psec/div

Trigger Channel A internal

Pulse

Generator:

switched off.

8081A:

@ Mode switch

TRIG

@ NEG-POS·MAN switch

pas

Pulse

Generator:

Switch

pulse generator on.

SetpuIse

periodtoabout15fJ.sec.

Set

pulse

widthtoabout8fJ.sec.

Set

pulse

amplitudeto2V

and

polarity

to

pas.

Set

the

oscilloscopetotrigger

from

chan-

nel

B internally.

3-25
modes:

The

8081 A has

four

different

operating

Normal (NORM)

Trigger (TRIG)

External

Gate

(EXT GATE)

Internal

Gate

(INT GATE)

3-30

The

oscilloscope display should be as shown

in

figure

3-4.

The

8081 A

output

should

only

be

delayed

on

the

external

inputbythe

internal

circuitry

delayofthe

8081 A

EXTERNAL

I

L

INPUT

Ov

-L

I

RATE

ov

II

GENERATOR

-O.6V

I

OUTPUT

II

f

I I

---J

!--

fixed

delay

Figure

3-4.

Rate

Generator

Output

in Trigger Mode.

3-31

Vary

the

EXT INPUT LEVEL switch ® and

note

that

the

trigger

output

disappears when

the

thre-

shold level reaches

approximately

+0.2V.

Set

the

exter-

nal

input

levelto-1

V.

3-32

Set

the

NEG-POS-MAN switch

@to

NEG.

Set

the

pulse

generator

output

polaritytonegative.

This gate signaIcan

come

from

either an external source (

via

the

EXT INPUT

connector

(J)

or

locally using

the

MAN

pushbutton

®. When

the

gate signal switches on,

the

first

output

pulseisalways startedatthe

beginning.

When

the

gate signal switches off,

the

pulseisterminated

immediately,i.e.

the

last pulse may be

cut

short.

3-37

In External Gate

mode

the

repetition rate

generator

outputisenabled/disabled by a gate signal.

3-33

The

oscilloscope display should be similar

to

that

showninfigure

3-4

except

that

the

external

input

is

a negative-going pulse.

3-34

Vary

the

EXT INPUT LEVEL switch ® and

note

that

the

trigger

output

disappears when

the

thre-

shold level reaches

approximately

-O.2V.

3-35

As

mentioned

previously,

the

pulse

output

in

trigger

mode

can also be

produced

using

the

MAN

pushbutton

®.

First set

the

NEG-POS-MAN switch ®

to

MAN.

This transfers

the

trigger

input

from

the

EXT

INPUT

connector

(J)

to

the

MAN

pushbutton

@ .

Set

the

oscilloscope timebasetoabout

0.2

sec/em and trig-

ger internally. Press

the

MAN

pushbutton

@ and note

that

the

pulse

output

goes high when

the

buttonispres-

sed and low when itisreleased.

The

EXT INPUT

LEVEL control

® has no

effectinthis

mode.

Internal Gate Mode

3-39

Set

the

NEG-POS-MAN switch @toPOS

and

the

EXT INPUT LEVE L control ®

to-1V.

Vary

the

rate VERNIER

C2>.

Note

that

the

last pulse may be

cut

shortbythe

gate turning

off

(see figure

3-5).

3-38

Set

the

Mode switch ®

to

EXT GATE.

Set

the

oscilloscope timebaseto2 usee/em and trigger inter-

nally. Press

the

MAN

pushbutton

and

note

that

the

rep.

rate generator runs

at

the

selected rate for as long as

the

buttonisheld down.

3-41

Internal Gate mode can

only

be usedifan

8084A

300

MHz

Word Generator moduleisavailable.

In

this

modeofoperation

the

gate pulse for

the

rate genera-

tor

comes

from

the

word generator via an internal con-

nection. This gate enables

the

rate generator

output

in

the

same way as an external gate.

The

purpose of this

mode

istoenable an

exact

numberofdata bitstobe

gated

outofthe

word generator.

3-40

External Gate Mode.

3-36

EXTERNAL

OV

INPUT

Gate on

Gate off

RATE
GENERATOR

Ov-------;

OUTPUT

Last pulse may

not

be completed

Figure

3-5.

Rate

Generator

OutputinExternal

Gate

Mode.

,.------------------------------

SECTION 4

L--

PERFORMANCE TESTS

4-1

INTRODUCTION

EQUIPMENT

4-2

The procedures in this section test the Model

8081

A's

electrical performance using the specifications

of

Table

1-2asthe performance standards.

All

tests

can

be

performed

without

accesstothe interiorofthe in-

strument. A simpler operational test

is

included in

sec-

tion

3 under Operator's

Checks.

Counter HP

5345A

PROCEDURE

4-3

EQUIPMENT REQUI RED

1.

Setupthe equipmentasshown in figure

4-1

and

set

the controlsasfollows:

4-4

Equipment required

for

the performance

tests

is

listed in the Recommended Test Equipment table

in section

1.

Any

equipment

that

satisfies the critical

specifications given

in the table

canbesubstituted

for

the recommended model.

8081A:

RATE

range

,

300MHz-l00MHz

Rate

VERNIER

CCW
Operating Mode switch NORM
NEG-POS-MAN switch

POS

4-5

TEST RECORD

SPECI FICATION

DESCRIPTION

2.

Using the counter, measure the Model

8081

A out-

put frequency at the

following

repetition rate

settings.

8081A

RATE

VERNI

ER

RESULT

300MHz-100MHz

CCW

>300MHz

300MHz-100MHz

CW

<100MHz

100MHz-

lOMHz

CCW

>100MHz

100MHz-

10MHz

CW

<

10MHz

1

OM

Hz-

1MHz

CCW

>

10MHz

10MHz-

1MHz

CW

<

1MHz

1

MHz-100KHz

CCW

>

1MHz

1

MHz-100KHz

CW

<100KHz

100KHz-

10KHz

CCW

>100KHz

100KHz-

10KHz

CW

<

10KHz

10KHz-

1KHz

CCW

>

10KHz

10KHz-

1KHz

CW

<

1KHz

1

KHz-100Hz

CCW

>

1KHz

1

KHz-100Hz

CW

<100Hz

100Hz-

10Hz

CCW

>100Hz

100Hz-

10Hz

CW

<

10Hz

o

8080A

MAINFRAME

808lA

4-6

The resultsofthe performance tests

can

be
tabulated on the Test Record at the endofthe proce­dures. The Test Record lists all

of

the tested specifica-

tions and

their

acceptable limits. Test results recorded at

incoming inspection

canbeused

for

comparison in

troubleshooting and after repairs or adjustments.

4--7 REPETITION RATE TEST

The

output

frequencyofthe Model 8081 Aischecked

over the

full

repetition rate

range.

Repetition Rate

.,

10Hzto300MHz

Figure

4-1.

Repetition

Rate

Test Setup

4-8

TRIGGER OUTPUT TEST

3.

Measure

Amplitude, Baseline and

Duty

Cycle.

SPECIFICATION

Trigger

Output

Pulse

,-.6V±50mV

to

OV ±

50mV

Duty

Cycle 50 % ± 10 %

I-t

on

J-t

Off-J

Baseline

DESCRIPTION

The trigger

outputpuIse

parameters

are

tested.

Amplitude

shouldbe. ,

6V±50mV

Baseline should

be

OV±50mV

Duty

Cycle

shouIdbe

50 %~10 %

ton

x 100%

period

4-9

EXTERNAL TRIGGER MODE
(SLOW) TEST

Duty

cycle =

o

SAMPUNG

OSCI

LlOSCOPE

D

01

8080A

MAINFRAME

80S1A

Figure

4-2.

Trigger

Output

Test Setup

SPECI

FICATION

EQUIPMENT

The repetition rate

outputiscontrolled externally. The

trigger and internal

outputs

are

pulse-shaped versions

of

the trigger input.

Sampling oscilloscope

HP

182C Mainframe

with

1810A

plug-in

DESCRIPTION

PROCEDURE

1.

Set

up the equipmentasshown in figure

4-2

and

set

the controlsasfollows:

The

functionofthe Model 8081 Aistested in external

trigger mode using

an

external sinewave generator

to

apply a trigger signalof10KHz.

so

OHM

TERL4lNATlON

,

REI>,L

TIME

OSCILI,OSCOP~

RATE

range

300MHz-100MHz

Rate VERNIER ,.., ,

CW

Operating Mode switch NORM

NEG-POS-MAN switch

POS

8081A:

Oscilloscope

50QHM

T£~

2.

Sensitivity..,

200mV/div
Trigger internal
Timebase mode expanded
Timebase - direct 20ns/div
Timebase - expanded 2ns/div

Set

Frequencyto100MHzonscreen

using Rate

VERNIER.

Figure

4-3.

External Trigger Mode (Slow) Test Setup

EQUIPMENT

Oscillator ,

HP

651

B

Real

Time Oscilloscope

HP

182C Mainframe

with

1804A

and 1821 A plug-ins

50 Ohm Feedthru Termination

HP

10100C

/

PROCEDURE

1.

Set up the equipmentasshown in figure

4-3

and

set

the controlsasfollows:

5.

Set

NEG-POS-MAN switchtoNEG

and repeat

steps

3 and 4 observing the

pulses.

The Model

8081Aoutput

shouIdtrigger on the negative

half-cycles

of

the oscillator output.

8081 A:

SPECIFICATION

RATE

range

100KHz-10KHz

Rate

VERNIER

CCW

Operating Mode switch

TRIG

EXT

INPUT

LEVEL

center

NEG-POS-MAN switch

pas

4-10

EXTERNAL

GATE MODE (SLOW)

TEST

Oscilloscope:

Gate

signal

turns

rep.

rate generator on synchronously.

Sensitivity (both channels) 1

V/div

Trigger.

, external

Timebase main 20ps/div

Oscillator:

DESCRIPTION

The functionofthe Model

8081Ais

tested in external

gate mode using

an

external sinewave generatortoapply

a gate

signalof10KHz.

Frequency

10KHz

Amplitude

1VRMs

3.

Check

that

during the positive slopeofthe oscilla·

tor

output

a positive pu

Ise

output

occurs.

4.

Turn

EXT

INPUT

LEVEL

control

from

positive

to

negative and observe waveforms.

so

OHM TEE

SQOHM

TERMINATION

REAl.

,IME

OSCU.LOSCOPE

Figure

4-4.

External Gate Mode (Slow) Test Setup

EQUIPMENT

Oscillator ,HP651

B

Real

Time Oscilloscope

HP

182C Mainframe

with

1804A

and 1821 A plug-ins.

50 Ohm Feedthru Termination

HP

10100C

i*--

Propagation

delay

I

Display oscillator

output

and Model 8081 A

output

on screen

8081A

OUTPUT

2.

OSCILLATOR
OUTPUT

PROCEDURE

OSCILLATOR
OUTPUT

8081 A

OUTPUT

Threshold

lever"""+1V

-1V

1.

Setupthe equipmentasshown in figure

4-4

and

set

the controlsasfollows:

8081A:

RATE range. ,

100KHz-10KHz

Rate

VERNIER

CCW

Operating Mode switch

GATE

EXT

EXT INPUT

LEVEL

center

NEG-paS-MAN switch

pas

Oscilloscope:

4-11

MANUAL

FUNCTION TEST

\

Sensitivity (both cha nnels) 1VIdiv
Trigger external

SPECI FI

CATION

Timebase, main

20~s/div

All

external functions canbetriggered manually by

pressing a pushbutton.

Oscillator:

o

00

500HM

HRMINATJON

SOBOA

MAINfRAME

SOS1A

REAL

TIME

ascI

LLOSCO~E:

Frequency 10KHz

Amplitude 1

VRMs

Display oscillator

output

and 8081 A

output

on

screen.

2.

3.

Check

that

during

the

positive slopeofthe

oscilla-

tor

output

a pulse burst appears.

Figure

4-5.

Manual Function Test Setup

EQUIPMENT

Threshold level

OSCILLATOR

OUTPUT

I I

I I

I I

~

r--Delay

of

1/2

period

8081A

i,hnnnn

rl

-

OUTPUT

-----.lJ

UUUUU

~

OV

Real

Time Oscilloscope

HP

182C Mainframe

with 1804A and 1821 A plug-ins

PROCEDURE

1.

Set up

the

equipmentasshowninfigure

4-5

and

set the controls

as

follows:

8081

A:

4.

Turn

EXTINPUT

LEVEL control from positive

to

negative and observe the waveforms.

RATE range

100KHz-10KHz

Rate VERNIER ,..,

CCW

Operating Mode switch GATE

EXT

EXT

INPUT LEVEL -

NEG-POS-MAN switch ,

MAN

Oscilloscope:

OSCILLATOR

I I

OUTPUT

-+

__

I_

I I

I I

I I

I I

I I

I I

I I

8081A

IlJU

OUTPUT~

~__~

I

I

I

I

I I

I I

11nJllUlJlJt:

2.

Sensitivity , 1V/div
Trigger, , , internal
Timebase, main ,

10IlS/div

Press

MAN

pushbutton.Aslongasthe

Man

button

is

pressed a pulse train should be visible

~MAN

button--..J

I pressed I

_llll~11Ill·I.lml-UIJ/JINI.ll-

OV

Threshold level

--+

+1

V

-1V

Note

that

the last pulse will be

cut

offassoon

as

the

gate closes.

3.

Set

the

OperatingMode switch to T

RIG.

Press the

MAN

pushbutton.Aslongasthe

MAN

button

is

pressed the

output

should be

OV.

5.

Set

the

NEG-POS-MAN switch to

NEG

and repeat

steps 3 and 4 observing the pulses.

The

8081 A

output

should be gated on

the

negative half-cycles

of the oscillator output.

r-

MAN

button~

pressed I

SPECI

FICATION

SameasEXTERNAL

TRIGGER

MODE (SLOW),

para-

graph

4-9.

4-12

EXTERNAL

TRIGGER

MODE (FAST)

TEST

Oscilloscope:

Sensitivity

200mV/div
Trigger external
Timebase mode expanded
Timebase - direct 20ns/div
Timebase - expanded 0.5ns/div

OESCRI PTION

2.

Adjust the

Model8081A

EXT

INPUT

LEVEL

controltoobtain a stable

50%

duty

cycle display.

A high frequency test

of

the Model

8081

A external

trigger mode using

an

externalpuIse

generatortoapply a

trigger signal

of

250M

Hz.

3.

Each

trigger pulse

from

the pulse generator should

release

one

outputpuIse

from

the Model 8081 A.

Check

that

the display

has

a frequency

of

250M

Hz.

EXTERNAL

GATE MODE (FAST)

TEST

SameasEXTERNAL

GATE

MODE (SLOW), paragraph

4-10.

4-13

SPECIFICATION

SAMPLING

OSCILLOSCOPE

DESCRIPTION

Figure

4-6.

External Trigger Mode (Fast) Test Setup

EQUIPMENT

The maximum external

gate

frequencyofthe Model

8081 A

is

tested in external gate mode usinganexternal

pulse generator

to

apply a gate signalof150MHz.

SAr,.lPLIfIlG

OSCII,.LOSCOPE

1.

Set up the

equ

ipmentasshown in figure

4-6

and

set

the controlsasfollows:

PROCEDURE

Pulse

Generator

HP

8082A

Sampling Oscilloscope

HP

182C

with

181

OA

plug-in

Pulse

Generator:

Figure

4-7.

External Gate Mode (Fast) Test Setup

Repetition rate 250MHz

Pulse

width

2ns

Amplitude

0.2 V

Polarity positive

EQUIPMENT

Pulse

Generator

HP

8082A

Sampling Oscilloscope HP 182C

with

1810A
plug-in

8081A:

RATE

range -

Rate

VERNI

ER

_ -

Operating Mode switch

TRIG

EXT

INPUT

LEVEL

center

NEG-POS-MAN switch

POS

PROCEDURE

1.

Set up the

equ

ipmentasshown in figure

4-7

and

setupthe controlsasfollows:

Pulse

Generator:

Repetition rate 150MHz

Pulse

width

square wave

Amplitude

0.2 V

Polarity

........................•..

positive

8081 A:

RATE

range

300MHz-l00MHz

Rate

VERNIER

CCW

Operating Mode switch

GATE

EXT

EXT

INPUT

LEVEL

center

NEG-paS-MAN switch

pas

2.

3.

Oscilloscope:

Sensitivity

200mV/div
Trigger external
Timebase mode ,

..

expanded
Timebase - direct 20ns/div
Timebase - expanded 5ns/div

Adjust the EXT INPUT

LEVE

L control

for

a

stable 150 MHz pulse presentation on the display.

Observe

that

each

external gate pulse

releases

two

8081Apulses.

Table

4-1

Performance Test Record

Hewlett-Packard

Tested

by

Model 8081 A

Date
300MHz Repetition Rate Generator
Serial No.

Paragraph

Results

Test

Number

Min

Actual

Max

4-7

Repetition

Rate

10Hzto300MHz

<10HZ

-

-

>300M

Hz

4-8

Trigger

Output

Trigger

Output

Pulse:

-.6V±50mV

-0.55V

-O.65V

toOV±

50mV

-O.05V

+0.05V

Duty

Cycle:

50 %

± 10 %

40%

60%

,-------------------------------SECTION

5

'-----------------------------ADJUSTMENTS

5-1

INTRODUCTION

5-2

This

section

describes

adjustments

required

to

return

the

Model 8081 A

Repetition

Rate

Generator

to

peak

operating

condition.

Includedinthis

section

are

test

setups,

and

checks

and

adjustments.

Removal and

replacement

procedures

are

given in

the

Disassembly/

Assembly

procedureinsection7.An

adjustment

locator

diagram is

includedinthis

section.

5-7

Make sure

that

only

fuses

with

the

required

rated

current

andofthe

specified

type

(normal blow,

ti me delay, etc.)

are

used

for

replacement.

The

use

of

repaired fuses

and

the

short-circuitingoffuseholders

must

be avoided.

5-8

Whenever itislikely

that

the

protection

has

been impaired,

the

instru

ment

must be

made

inoperative

and be secured against

any

unintended

operation.

5-3

SAFETY

CONSIDERATIONS

5-9

TEST EQUIPMENT REQUIRED

5-10

Table

1-1

containsa listoftest

equipment

and

test

accessories required in

the

adjustment

proce-

dures.

In

addition,

the

tables

contain

the

required mini-

mum

specifications

and

a suggested

manufacturer's

model number.

5-4

Although

this

instrument

has been designed

in

accordance

with

international

safety

standards,

this

manual

contains

information

and

warnings

which

must

be

followedtoensure safe

operation

andtoretain

the

instrumentina safe

condition

(see

SectionsIIand

III).

Service

and

adjustments

shouldbeperformed

only

by

qualified service personnel.

5-11

ALIGNMENT

TOOL

IWARNING I

5-12

A non-metallic

alignment

tool

mustbeused

when

making

any

adjustmentstothe

Model 8081

A.

5-14

After

making

the

adjustments,

carry

out

the

Performance

ChecksinSection

4.

Any

interruptionofthe

protective

(grounding)

conductor

insideoroutside

the

instrument

or

disconnectionofthe

protective

earth

terminal

is

likelytomake

the

apparatus

dangerous.

Intentional

interruptionisprohibited.

5-13

5-15

PERFORMANCE CHECKS

RELATED ADJUSTMENTS

5-5

Any

adjustment,

maintenance,

and

repair

of

the

opened

instrument

under

voltage

should

be avoided

as

much

as possible and,

when

inevitable,

should

be

carried

out

onlybya skilled

person

whoisawareofthe

hazard

involved

The

openingofcoversorremoval

of

parts,

except

thosetowhich access

canbegained

by

hand,

may

expose

live parts,

and

also accessible termi-

nals

may

be live.

5-6

Capacitors

inside

the

instrument

may

still

be

charged even if

the

instrument

has been

disconnected

from

its

sourceofsupply.

5-16

The

following

adjustments

must be per-

formedinthe

order

indicated in

the

procedures.

The

adjustments

can

notbeperformed

individually because

of

interaction.

5-17

After making

the

adjustments

the

following

related

adjustments

should

be checked.Ifthe

Model

8081 A

outputisconnectedtoa

word

generator,

the

word

generator

trigger level

must

be checked and, if

necessary, adjusted.

If

the

Model 8081 A

outputiscon-

nectedtoan

output

ampl ifier,

the

output

amplifier

duty

cycle

must be

checked

and, if necessary, adjusted.

5-18

DUTY

CYCLE

AND

FREQUENCY ADJUSTMENTS

Frequency

adjust

307M

9M

Duty

Cycle

100M-10M

300M-100M

DESCRIPTION

These adjustments

set

up the correct

duty

cycle at high

and

low

frequencies and

cal

ibrate the frequency output.

An

oscilloscopeisusedtocheck

the

duty

cycle and a

countertocheck the frequency.

08081-66502

BOARD

A2

c:::J

R4

CJ

R8

c:J

R16

Figure

5-1.

Duty

Cycle Adjustment Test Setup

c::::J

R109

80SlA

S080A

MA~NFRAME

COUNTE.A

,

/

/,

//

/

, /

=

0

=0

/,/

~/

///

0

0

=

;,-

//

0

/ /

/'

o

SAMPLING

OSCILLOSCOPE

D

cI

8OS0A

MAINfRAME

8081A

EQUIPMENT

Sampling Oscilloscope

HP

182C Mainframe

with

181OASampl

ing

plug-in

Counter

HP

5345A

Figure

5-2.

Frequency Adjustment Test Setup

3.

Set

up the

equ

ipmentasshowninfigure

5-2

and

set

the

controlsasfollows:

PROCEDURE

80Bl

A:

1.

Setupthe equipmentasshown in figure

5-1

and

set

the

controlsasfollows:

8081A:

RATE

range

300-100MHz

Rate

VERNIER

Clockwise

Operating Mode NORM
Oscilloscope:

RATE

RANGE

300-100MHz

Rate

VERNIER

CCW

Operating Mode NORM

Counter:

Frequency

350MHz

Sensitivity 200mV/d

iv
Trigger internal
Timebase mode expanded
Timebase - direct 20ns/div
Timebase - expanded 1ns/div

4.

Adjust

A2R4toa frequencyof307MHz

± .5MHz

5.

Set the Model 8081 A RAT

Eta

100-1

OMHz.

and

rate

VERNIERtoCWo

2.

Adjust

A2R16

foraduty

cycleof....

50 % ± 10 %

6.

Adjust

A2R8toa frequencyof...

9MHz ±.1MHz

7.

Reconnect the equipmentasin figure

5-1

and

set

the controlsasfollows:

B081A:

ton

Duty

Cycle = x 100%

period

RAT

E range

300-100MHz

Rate

VERNIER

CCW

Operating Mode NORM

Oscilloscope:

Sensitivity

200mV/div
Trigger internal
Sweep

Mode

expanded

Timebase

- main 20ns/div

Timebase-expanded

0.5ns/div

8.

Adjust

A2 R109foraduty

cycleof..

50

%±

10

%

9.

Connectanexternal

pulse

generatortothe

Model

8081 A EXT INPUT

connector

and

set

the

controls

as follows:

External Pulse

Generator:

Repetition

Rate 50MHz

Operating

Mode

square

wave

Ampl

itude

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1V

Polarity

positive

8081A:

RATE range

300-100MHz

Rate

VERNIER

,

CCW
Operating Mode GATE EXT
Input

Polarity POS

EXT INPUT

LEVEL

approx

+0.5V

Oscilloscope:

same

settings as

for

previous adjust-

ment

(step 7).

10. Check

the

duty

cycleofthe

first pulseonthe

dis­play. If necessary,

readjust

Rl09

slightlytoset

the

duty

cycle

to

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

50% ±

10%

,-------------------------------

SECTION 6

'---------------------------REPLACEABLE

PARTS

6-1

INTRODUCTION

6-7

The

information given for each

part

consists

of

the following:

6-2

This section contains information for order-

ing parts.

Table

6-1

lists abbreviations usedinthe

parts

lists and elsewhere

in

the

manual. Table

6-2

lists all

replaceable

partsinreference designator order.

Table

6-3

contains

the

names and addresses

that

corre-

spondtothe

manufacturer

code

numbers.

6-3

ABBREVIATIONS

6-4

Table

6-1

lists abbreviations usedinthe

parts lists, schematics and elsewhereinthe

manual. In

some cases

two

formsofthe

abbreviation are used,

one

all in capital letters,

and

one

partialorno capitals. This

occurs because

the

abbreviationsinthe

parts

lists are

always

all

capitals. However,inthe

schematics and

other

partsofthe

manual,

the

same abbreviations may have

upper and lower case letters.

6-8

a.

The

Hewlett-Packard

part

number.

b.

The

total

quantity

(Qty)inthe

instru-

ment. This

is

given

only

once

for each

part

-

at

the

first appearanceofthe

partinthe

list.

c.

The

descriptionofthe

part.

d.

A typical manufacturerofthe

partina

five-digit code.

e.

The

manufacturers' code number for

the

part.

ORDERING INFORMATION

6-5

REPLACEABLE PARTS

6-6

Table

6-2isthe

listofreplaceable parts and

is

organised as follows:

a.

Illustrated parts breakdowns for chassis

mounted

parts.

b.

Chassis

mounted

partsinalphanumerical
orderbyreference designator.
c.

Electrical assemblies and their compo-

nentsinalphanumerical

order

by reference

designator.

6-9

To

order

a part listedinthe

replaceable

parts

table,

quote

the

Hewlett-Packard part number, indicate

the

quantity

required, and address

the

ordertothe
nearest Hewlett- Packard office (listofSales/Service
offices

at

the

rearofthe

8080A

Mainframe manual).

6-10

To

orderapart

thatisnot

listedinthe

re-

placeable parts table, include

the

instrument model num·

ber,

instrument

serial number,

the

description and

function

of

the

part,

and

the

numberofparts

required.

Address

the

ordertothe

nearest Hewlett-Packard office.

6-4-----------------------------------------------------------------------------

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Table

6-2.

Replaceable

Parts

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Table

6-2.

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,------------------------------SECTION

7

L.....------------------------------SERVICE

7-1

INTRODUCTION

Table

7-1.

Reference Designators

7-2

This section

contains

the

component

layouts

and schematic diagrams

for

the

Model

8081A

Rep. Rate

Generator.

Tables listing

the

reference

designators

and

schematic

symbols used are also given. Refertosection 6

for

the

replaceable

parts

information.

7-3

RECOMMENDED TEST EQUIPMENT

7-4

Test

equipment

and

test

equipment

acces-

sories required

to

maintain

the

Model

8081A

are listed

in

table

1-1.

Equipment

other

than

that

listed can be

used

if

it meets

the

listed critical specifications.

A

==

assembly U

==

micro-circuit

B

==

motor

P

==

plug

BT

==

battery

Q

==

transistor

C

=

capacitor

R = resistor

CP

=

coupler

RT

==

thermistor

CR =

diode S

=

switch

DL

=

delay line T =

transformer

DS

=

lamp

TB

=

terminal board

F

=

fuse V

=

vacuum,

tube,

neon

FL

=

filter

bu Ib. photocell, etc.

HR

==

heater

VR

= voltage regu lator

J

=

jack

W

=

cable

K

=

relay

X

=

socket

L

=

inductor

Y

=

crystal

M

=

meter TP

=

test

point

7-2

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

Table

7-2

Schematic

Diagram

Symbols

The

following symbols

conform,asfar as possible,

with

ANSI Y32.2,

IEEE

No.

315

and ANSI

Y32.14

(for

the

logic symbols). These

standards

shouldbeconsulted

when

further

informationisrequired.

Resistance values are

in

ohms,

capacitance

values

in

microfarads

and

inductance

values in microhenries unless

otherwise

noted!

I

+10V

PIO

*

[

---....,

___

-J

-

---

90

.J..

I

xV

Part of

Asterisk

denotesafactory

selected value.

The

value

shown

is

the

nominal value.

Encloses

front

panel

nomenclature

Encloses rear panel

nomenclature

Heavy line indicates signal

path

Heavy dashed line indicates

primary

feedback

path

Wire

colour

code.

Same

as resistor

colour

code. First

numberiswire

body

colour.

Wire

our

plug used as link.

Test

point

ina

circuit.

Point

may/may

not

be identi-

fied

onP.C.

board.

Used

with

trimmer

potentiometersorcapacitors

to

indicate screwdriver

adjustment.

Direct

connectiontoearth

.

Ground

connectiontoinstrument

chassisorframe.

Used

whenanumberofcommon-return

connections

areatthe

same

potential.Ifthereismore

than

one

such

systeminthe

same circu it,

numbers

are

written

in

the

triangles so

that

all

connections

with

the

same

potential have

the

same number.

Specific

potential

difference

with

respecttoa poten-

tial reference level,

ego

Normally

open

toggle switch. Circles

(0)

are

used for

the

contactstoindicate a locking

type

switch.

/

--------------------------------7-3

Spring return, 2-position transfer switch. Triangles (A-)
'!re used for

the

contactstoindicate a non-locking

type

switch.

o
o

9

6

9

6

2-position, 2-pole slide switch.

)

.

~

~.

II

If

~

bead

---.l~

~

Air

cored

inductor.

Air

cored

transformer.

The

dot

(e)

is

used, when

necessary,

to

indicate instantaneous polarity.

Iron core

Ferrite core

Ferrite bead

Varactor diode

Multi-junction diode

Diode

Zener diode

Schottky

diode

Light Emitting Diode (LED)

Photodiode

Fuse

Neon

Filament lamp

7-4-------------------------------

Terminals and Connecton

Soldered

connection.

,

~

Exampleoffixed male

and

female

connectors

with

plug

and

socket

and

contact

designators,

egoP.C.

board

edge

connector

and socket.

exampleofbulkhead

mounted

coaxial socket

with

free coaxial plug

and

cable.

example

of coaxial cable with

termination

soldered

to

P.C.board.

Analog/Digital logic symbols

2-input NAND gate

2

3

4-input NOR gate

L - 6

R Q

Inverter

Flip-flop.

The

dynamic

indicator denotes

that

thisisa

dynamic

input

and

operatesona transition, not a level.

-----------------------------------7-5

Complex functions represented by rectangu lar box.

Letters can be used inside

the

rectangletoclarify

the

function. A

truth

table

should be included, as close as

possible

to

the

circuit.

14

U6

Schmitt

trigger

+-

+

Wired AND

connection

Wired OR

connection

2

3

Operational amplifier

Voltage source

Current

source

7-6------------------------------

Schematic

3

--..,~

..

--

Signal

jr

number

-~.

)

~

Schematic

~

number'

;;

I

I

,

6

These

references

on a

signal

leavingaschematic

diagram

indicate

the

signal

des1ination.

The

circle

contains

the

signat

number

and

the

square

contains

the

numberof

the

schema

1ic

to

which

that

signal

goes.

These

references

onasignat

entering

a SChematic

diagram

Indicate

the

signal

crigin.

The

circle

contain

s the

signal

number

and

the

square

conto'lns

the

number

of

the

schematic

on which

that

signal

originates.

7-8

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

FRONT

PANEL

(INSIDE)

A1Wl

A1W2

A1

r}

•••••

-il

:'

A1J3

71

L!..

• • • •

·1

14---8

7

1

o

Rl

/---""

(

~

A1R1

\ /

......

-

C

NO

NC

,--\

I

•••

1 A152

I

'-

J

08081 - 66501

CONTROL

BOARD

(

SERVICE SHEET 1

--7-9

52

EXT

Rl

INPUT

5K

LEVEL

-lOV

MAN. PUSHBUTTON

-10V

..

~:~

~~~i~-ARJ-~~-E-BOARDI:

(~N177

--k-<O:-~-_<;>_._y_I

(OBOB1-

66502)

-.-1:

J--~'-~+til~l

I [II - W

L.

__

-'OV

o

I

I

I

MHz

~~N~~~

BOARD

I

(08081-

66502)

W2

54

1 _

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