Tektronix 7B87 Manuale utente

Tektronix,

Inc.

P.O.

Box

500

Beaverton,

Oregon

070-2788-00

Product

Group

Tektronix:

COMMITTED

EXCELLENCE

PLEASE

CHECK

FOR

CHANGE

INFORMATION

THE

REAR

THIS

MANUAL.

7B87

TIME

BASE

WITH

PRETRIGGER

ACQUIRE

CLOCK

INSTRUCTION

MANUAL

97077

Serial

Number

—

First

Printing

APR

1980

Revised

JAN

1986

1980

Tektronix,

Inc.

All

rights

reserved.

Contents

this

publication

may

not

reproduced

any

form

without

the

written

permission

Tektronix,

Inc.

Products

Tektronix,

Inc.

and

its

subsidiaries

are

covered

U.S.

and

foreign

patents

and/or

pending

patents.

TEKTRONIX,

TEK,

SCOPE-MOBILE,

and

are

registered

trademarks

Tektronix,

Inc.

TELEQUIPMENT

registered

trademark

Tektronix

U.K.

Limited.

Printed

U.S.A. Specification

and

price

change

privileges

are

reserved.

INSTRUMENT

SERIAL

NUMBERS

Each

instrument

has

serial

number

pariel insert,

tag,

stamped

the

chassis.

The

first

number

letter

designates

the

country

manufacture.

The

last

five

digits

the

serial

number

are

assigned

sequentially

and

are

unique

each

instrument.

Those

manufactured

the

United

States

have

six

unique

digits.

The

country

manufacture

identified

follows:

B000000

Tektronix,

Inc.,

Beaverton,

Oregon,

USA

100000

Tektronix

Guernsey,

Ltd.,

Channel

Islands

200000

Tektronix

United

Kingdom,

Ltd.,

London

300000

Sony/Tektronix,

Japan

700000

Tektronix

Holland,

NV,

Heerenveen,

The

Netherlands

7B87

Instruction

TABLE

CONTENTS

PAGE

UST

ILLUSTRATIONS

LIST

TABLES

........

OPERATORS

SAFETY

SUMMARY

SERVICING

SAFETY

SUMMARY

SECTION

1—-OPERATING

INSTRUCTIONS

INSTALLATION

CONTROLS,

CONNECTORS,

AND

INDICATORS

FUNCTIONAL

CHECK

SETUP

PROCEDURE

SWEEP

FUNCTIONS...

TRIGGERING

FUNCTIONS

PRETRIGGER

ACQUIRE

CLOCK

FUNCTIONS

GENERAL

OPERATING

INFORMATION

TRIGGERING

SWITCH

LOGIC

TRIGGERING

MODES

TRIGGER

COUPLING

TRIGGER

SOURCE

TRIGGER

SLOPE

TRIGGER

LEVEL

HORIZONTAL

SWEEP

RATES

TIME

MEASUREMENT.......

SWEEP

MAGNIFICATION

VARIABLE

HOLD

OFF

tee

MAINFRAME

OPERATING

MODES

1-12

APPLICATIONS

.......+--200eee

ees

TIME

INTERVAL

MEASUREMENTS

PERIOD

AND

FREQUENCY

MEASUREMENTS

...

RISE-TIME

AND

FALL-TIME

MEASUREMENTS

PULSE

WIDTH

MEASUREMENTS...............

CORDOHEES

HHS

SECTION

2--SPECIFICATION

STANDARD

ACCESSORIES

......

[wannine

)

THE

REMAINING

PORTION

THIS

TABLE

CONTENTS

LISTS

SERVICING

INSTRUCTIONS.

THESE

SERVICING

INSTRUCTIONS

ARE

FOR

USE

QUALIFIED

PERSONNEL

ONLY.

AVOID

ELECTRICAL

SHOCK,

NOT

PERFORM

ANY

SERVICING

OTHER

THAN

THAT

CALLED

OUT

THE

OPERATING

INSTRUCTIONS

UNLESS

QUALIFIED

so.

SECTION

3--THEORY

OPERATION

BLOCK

DIAGRAM

DESCRIPTION

TRIGGER

GENERATOR

....

SWEEP

GENERATOR

PICKOFF

AMPLIFIER

AND

DELAY

GATE

DIGITAL

VOLTMETER

CLOCK

GENERATOR

REV

JUN

1981

DETAILED

CIRCUIT

DESCRIPTION

FRONT-PANEL

DISTRIBUTION

TRIGGER

GENERATOR

EXTERNAL

SOURCE.

INTERNAL

AND

LINE

SOURCE

TRIGGER

SOURCE

SELECTOR

AND

AMPLIFIER

...

PEAK-TO-PEAK

AUTO.

SLOPE

SELECTOR

AND TRIGGER

GENERATOR

GATE

GENERATOR

SSSI

Oooo

SWEEP

MODES

HOLD

OFF

TIMING

LOCKOUT

BUFFER

AMPLIFIER

HOLD

OFF

OUTPUT

AMPLIFIER.

SWEEP

GENERATOR.........

TIMING

CURRENT

SOURCE

RAMP

GENERATOR

.......

HORIZONTAL

PREAMPLIFIER

SWEEP

GATE

GENERATOR

. z

DVM

occ

vcscccescectecceescencetoccoeeressoeseee

3-10

DELAY

TIME

COMPARATOR

AND

DELAY

GATE

GENERATOR

DIGITAL

VOLTMETER

DELAY

COMPARISON

VOLTAGE-TO-RAMP

CONVERTER

COMPARATOR

REFERENCE

CURRENT

SOURCE

REFERENCE

CURRENT

INVERTER

COUNTER

AND

ENCODER

CLOCK

GENERATOR

CONTROL

LOGIC

OSCILLATOR

FIRST

DIVIDER

X1-X10

MULTIPI

DECADE

DIVIDER

INTERNAL

CLOCK

MULTIPLEXER

OUTPUT

CLOCK

MULTIPLEXER

INTENSIFY

CIRCUIT

7887

HORIZ

PLUG-IN

COMPARTMENT

“

INTERNAL

BUTTON

PRESSED......

7887

HORIZ

PLUG-IN

COMPARTMENT

INTERNAL

BUTTON

PRESSED..........

TIME/DIVISION

AND

READOUT

SWITCHING

BASIC

READOUT

SYSTEM

TIME/DIVISION

READOUT.

ACQUIRE-STOP

DELAY

TIME

READOUT

INTERFACE

CONNECTIONS

AND

POWER

SUPPLY

ciivesedccececseveeevevessses

asesee

S47

SECTION

4-—-MAINTENANCE

PREVENTIVE

MAINTENANCE

...

CLEANING....

EXTERIOR

....

INTERIOR...

SWITCH

CONTACTS

TROUBLESHOOTING

........

CORRECTIVE

MAINTENANCE

......

ADJUSTMENT

AFTER

REPAIR

7B87

Instruction

TABLE

CONTENTS

(CONT)

VISUAL

INSPECTION

LUBRICATION

CAM

SWITCH

LUBRICATION.

4-2

SEMICONDUCTOR

CHECKS

wesses

MEQ

ADJUSTMENT

AFTER

REPAIR

TROUBLESHOOTING

AIDS

4-2

DIAGRAMS

VOLTAGES

AND

WAVEFORMS.

4-2

CIRCUIT-BOARD

ILLUSTRATIONS

...

4-2

SWITCH

CAM

IDENTIFICATION

DIODE

COLOR

CODE..

WIRING

COLOR

CODE

SEMICONDUCTOR

LEAD

CONFIGURATIONS

.....

INTER-BOARD

CONNECTOR

IDENTIFICATION

MULTI-PIN

CONNECTOR

IDENTIFICATION

INTERFACE

CONNECTOR

LOCATIONS

PERFORMANCE

CHECK

AND

ADJUSTMENT

STATIC

SENSITIVE

DEVICES

....

TROUBLESHOOTING

EQUIPMENT.....

TROUBLESHOOTING

TECHNIQUES.....

TROUBLESHOOTING

PROCEDURE

OBTAINING

REPLACEABLE

PARTS

SOLDERING

TECHNIQUES........

5 z

COMPONENT

REMOVAL

AND

REPLACEMENT

CIRCUIT

BOARDS

SWITCHES

SEMICONDUCTORS

INTERCONNECTING

PINS.

CIRCUIT-BOARD

PINS

FRONT-PANEL

LIGHTS

INSTRUMENT

REPACKAGING

PAGE

SECTION

5--PERFORMANCE

CHECK

AND

ADJUSTMENT

PRELIMINARY

INFORMATION

ADJUSTMENT

INTERVAL

TEKTRONIX

FIELD

SERVICE.

USING

THIS

PROCEDURE

TEST

EQUIPMENT

REQUIRED

. .

SPECIAL

FIXTURES

TEST

EQUIPMENT

ALTERNATIVES.

INDEX

PERFORMANCE

CHECK

AND

ADJUSTMENT

PROCEDURE

PRELIMINARY

PROCEDURE

TRIGGERING

SYSTEM

...

HORIZONTAL/AQS

SYSTEM

SECTION

6—!INSTRUMENT

OPTIONS

SECTION

REPLACEABLE

ELECTRICAL

PARTS

SECTION

8--DIAGRAMS

AND

CIRCUIT

BOARD

ILLUSTRATIONS

SECTION

9—REPLACEABLE

MECHANICAL

PARTS

CHANGE

INFORMATION

REV

JUN

1981

FIG.

NO.

Frontis.

piece

7B87

Instruction

LIST

ILLUSTRATIONS

PAGE

7887

Features........

Location

release

latch.

Front-panel

controls,

connectors,

and

INDIO

vcs

sssansuese

ees

earcceanes

1-2

Single

Sweep

Acquisition.........6.-066s000e005

Effect

LEVEL

control and

SLOPE

switch

crt

display

Area

graticule

used

for

most

accurate

time

measurements

Operation

sweep

magnifier

Measuring

the

period

and

determining

the

frequency

displayed

waveform

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

1-13

Measuring

the

rise

time

and

fall

time

displayed

waveform

...........0000seseeeees

1.14

Measuring

the

pulse

width

displayed

waveform

7887

dimensional

drawing

Basic

block

diagram

the

7887

Delaying

Time Base

Unit

Detailed

block

diagram

Trigger

Generator

Timing

diagram

for

Gate

Generator

stage

(292,

096,

98)

Detailed

block

diagram

Logic

circuit

Detailed

block

diagram

Sweep Generator

Timing

events

that

form

the

Delay

Gate

signal

Lubrication

procedure

for

typical

CAM

SWICH

wicks

cuovuvcri

macevacsansaveseroavee

Semiconductor

lead

configuration

Inter-board

multi-pin

connector

assembly

REV

JUN

1981

FIG.

PAGE

NO.

End-lead

multi-pin

connector

assembly

..........

Location

numbers

Interface

connector

4-6

7887

troubleshooting

chart

Readout

board

removal

procedure

Coaxial

end-lead

connector

assembly

Location

securing

screws

and

inter-board

multi-pin

connectors

clock

circuit

board.

.....

4-12

4-10

Cam

switch

removal

procedure

..........0-45+5

4-13

Removal

procedure

for

typical

pushbutton

switch

4-12

Exploded

view

circuit-board

and

ferrule

The

illustrations

Section

are

located

near

their

associated

diagrams

the

foldout

pages.

Semiconductor

Lead

Configurations

Locations

circuit

boards

the

7B87.

A2-Trigger

circuit

board

assembly

A1-Interface

circuit

board

assembly

A1-Interface

circuit

board

assembly

-6

A1-Interface

circuit

board

assembly

A4-Clock

circuit

board

assembly

A4-Clock

circuit

board

assembly.

A3-Readout

circuit

board

assembly,

A1-Interface

circuit

board

assembly

Test

Point

and

Adjustment

Locations

7887

Instruction

LIST

TABLES

PAGE

TIME/DIV

Setting

Relationship

7887

Internal

Acquire

Clock

Rep

Rate

Electrical

Characteristics

Mainframe

Horizontal

Compatibility

Environmental

Characteristics

....

Physical

Characteristics

............00eeeeee

eee

Truth

Table,

TIME/DIV

Setting

vs.

Strobes

for

U637

and

U63B

oo...

eeeeeeeeeeeee

eens

Selected

Inputs

and

X10

Multiplexers.

Operation

Output

Multiplexer

U655

...

Current

CH1

Readout

Line

vs.

Acquire

Clock

Mode,

During

TS10.

Readout

Character

Selection

Relative

Susceptibility

Test

Equipment

.....

Acquire

Clock

Repetition

Rate

Output.

Delay

Time

Linearity

Acquire-Stop

Delay

Accuracy

6-13

Sweep

Timing

Magnified

Sweep

Timing

7887

Instruction

OPERATORS

SAFETY

SUMMARY

The

general

safety

information

this

part

the

summary

for

both

operating

and

servicing

personnel.

Specific

warnings

and

cautions

will

found

throughout

the

manual

where

they

apply,

but

may

not

appear

this

summary.

TERMS

THIS

MANUAL

CAUTION

statements

identify

conditions

practices

that

could

result

damage

the

equipment

other

property.

WARNING

statements

identify

conditions

practices

that

could

result

personal

injury

loss

of life.

MARKED

EQUIPMENT

CAUTION

indicates

personal

injury

hazard

not

immediately

accessible

one reads

the

marking,

hazard

property

including

the

equipment

itself.

DANGER

indicates

personal

injury

hazard

immediately

accessible

one

reads

the

marking.

SYMBOLS

THIS

MANUAL

Static-Sensitive Devces.

This

symbol

indicates

where

applicable

cautionary

other

information

found.

MARKED

EQUIPMENT

DANGER—High

voltage.

Protective

ground

(earth)

terminal.

ATTENTION—refer

manual

WARNINGS

POWER

SOURCE

This

product

intended

operate

mainframe

connected

power

source

that

will

not

apply

than

250

volts

rms

between

the

supply

conductors

between

either

supply

conductor

and

ground.

protective

ground

connection

way

the

grounding

conductor

the

mainframe

power

cord

essential

for

safe

operation.

GROUNDING

THE

PRODUCT

This

product

grounded

through

the

grounding

conductor

the

mainframe

power

cord.

avoid

electrical

shock,

plug

the

mainframe

power

cord

into

properly

wired receptacle

before

connecting

the

product

input

output

terminals.

protective

ground

connection

way

the

grounding

conductor

the

mainframe

power

cord

essential

for

safe

operation.

7B87

Instruction

DANGER

ARISING

FROM

LOSS

GROUND

Upon

loss

the

protective-ground

connection,

all

accessible

conductive

parts

(including

knobs

and

controls

that

may

appear

insulating),

can

render

electric

shock.

NOT

OPERATE

EXPLOSIVE

ATMOSPHERES

avoid

explosion,

not

operate

this

product

atmosphere

explosive

gases

unless

has

been

specifically

certified

for

such

operation.

NOT

OPERATE

PLUG-IN

UNIT

WITHOUT

COVERS

avoid

personal

injury,

not

operate

this

product without

covers

panels

installed.

not

apply

power

the

plug-in

unit

via

plug-in

extender.

7887

Instruction

SERVICING

SAFETY

SUMMARY

FOR

QUALIFIED

SERVICE

PERSONNEL

ONLY

Refer

also

the

preceding

Operators

Safety

Summary

NOT

SERVICE

ALONE

not

perform

internal

service

adjustment

this

product

unless

another

person

capable

rendering

first

aid

and

resuscitation

present.

USE

CARE

WHEN

SERVICING

WITH

POWER

Dangerous

voltages

exist

several

points

this

product.

avoid

personal

injury,

not

touch

exposed

connections

and

components

while

power

on.

Disconnect

power

before

removing

protective

panels,

soldering,

replacing

components.

POWER

SOURCE

This

product

intended

operate

mainframe

connected

power

source

that

will

not

apply

than

250

volts

rms

between

the

supply

conductors

between

either

supply

conductor

and ground.

protective

ground

connection

way

the

grounding

conductor

the

mainframe

power

cord

essential

for

safe

operation,

vii

7B87

Instruction

eee

eenene

TIME

BASE

W/PRETRIGGER

ACQUIRE

CLOCK)

2788.1

7B87

FEATURES

The

7887

Time-Base

unit

Pretrigger

Acquire

Clock

provides

calibrated

sweep

rates

from

seconds

nanoseconds

and

triggering

400

megahertz

for

7000-Series

Oscilloscopes.

X10

Magnifier

increases each

sweep

rate

factor

and

VARIABLE

TIME/DIV

control

provides

continuously-variable

sweep

rates

between

calibrated

steps.

Variable

holdoff

and

alphanumeric

readout

are

provided.

Also,

when

operating

the

AUTO

TRIGGERING

MODE,

bright

baseline

trace

displayed

the

absence

trigger

signal.

The

7B87

can

operated

independent

time

base

delayed-sweep

unit

with

companion

delaying

time-base

unit.

Sweep

mode

determined

the

companion

delaying

time

base

The

7887

also

features

internally-generated

clock

and

external

clock input

for

sequential

single

sweep

acquisition

when

operating

ina

7000-series

digitizing

oscilloscope.

The

frequency

range

the

internally

generated

clock

20.48

mHz

(millihertz)

20.48

MHz

determined

the

TIME/DIV,

X10

MAG,

and

INT

1000

switches.

Also,

ACQUIRE-STOP

DELAY

function

varies

delay

pickoff,

and

therefore

pretrigger

time,

compatible

digitizing

plug-in

oscilloscopes.

The

portion

the

oscilloscope

real-time

display

between

the

triggering

event

and

the

end

delay

time

intensified.

The

exact

delay

time

displayed

the

crt

readout

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