Tektronix 442 Manuale utente

tron

COMMITTED

EXCELLENCE

WARNING

THE

FOLLOWING

SERVICING

INSTRUCTIONS

ARE

FOR

USE

QUALIFIED

PERSONNEL

ONLY.

AVOID

PERSONAL

INJURY,

NOT

PERFORM

ANY

SERVICING

OTHER

THAN

THAT

CONTAINED

OPERATING

INSTRUCTIONS

UNLESS

YOU

ARE

QUALIFIED

SO.

INSTRUCTION

MANUAL

Tektronix,

inc.

P.O.

Box

500

Beaverton,

Oregon

97077

Serial

Number

070-237

4-01

First

Printing

AUG

1977

©.

4977,

1980

Tektronix,

Inc.

Allrightsteserved.

Contents

ofthis

publication

may

not

reproducedin

any

form:

without

the

written

permission

Tektronix,

rnc.

Products:

“Fektronix,

Ine.

and:

‘its

subsidiaries

are

coveted.

U.S.

and

foreign

patents.

and/or

pending

patents...

TEKTRONIX

aes

trade

442

Service

TABLE

CONTENTS

Page

LIST

ILLUSTRATIONS

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

LIST

TABLES

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

SAFETY

SUMMARY

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

Section

SPECIFICATION

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

1-1

ELECTRICAL

CHARACTERISTICS

1-1

ENVIRONMENTAL

CHARACTERISTICS

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

1-4

PHYSICAL

CHARACTERISTICS

....

1-5

ACCESSORIES

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

1-5

Section

OPERATING

INSTRUCTIONS

......

2-1

INTRODUCTION

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

2-1

INSTALLATION

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

2-1

CONTROLS,

CONNECTORS,

AND

INDICATORS..........000.000.

2-3

BASIC

OSCILLOSCOPE

OPERATION

2-8

Section

THEORY

OPERATION

........

3-1

GENERAL

.......

eee

3-1

BLOCK

DIAGRAM

DESCRIPTION...

3-1

DETAILED

CIRCUIT

DESCRIPTION

3-2

VERTICAL

INPUT

............,

3-2

VERTICAL

SWITCHING

........

3-3

VERT

OUTPUT

AMPL,

CRT,

PROBE

ADJ

..........-2005.

3-5

TRIGGER

«1.2...

eee

3-6

SWEEP

AND

HORIZONTAL

AMPLIFIER

............00005

3-8

HORIZONTAL OUTPUT

AMPLIFIER

3-9

POWER

SUPPLY

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

3-9

REV

MAY

1980

Page

Section

CALIBRATION

PROCEDURE

......

4-1

GENERAL

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

0.000005

4-1

Introduction.

..........00000,

4-1

Test

Equipment

Required

......,

4-1

PERFORMANCE

CHECK

.........

4-3

Introduction..............0,,

4-3

Preliminary

Procedure

.........,

4-4

Procedure

........0-

2.0

eee

4-5

ADJUSTMENT

PROCEDURE

......

4-12

Introduction.................

4-12

Preliminary

Procedure

.........

4-14

DISPLAY

AND

POWER

SUPPLY

4-17

VERTICAL

AMPLIFIER

.......

4-19

HORIZONTAL

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

4-23

TRIGGERING

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

4-25

Section

MAINTENANCE

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

5-1

INTRODUCTION

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

5-1

PREVENTIVE

MAINTENANCE......

5-2

TROUBLESHOOTING

...........

5-4

CORRECTIVE

MAINTENANCE

.....

5-12

Section

REPLACEABLE

ELECTRICAL

PARTS

Section

DIAGRAMS

CIRCUIT

BOARD

ILLUSTRATIONS

Section

REPLACEABLE

MECHANICAL

PARTS

442

Service

Fig.

No.

1-1

2-1

2-3

2-4

2-5

2-6

2-7

2-8

2-10

2-11

2-12

2-13

2-14

2-15

2-16

2-17

2-18

3-14

LIST

ILLUSTRATIONS

Page

442

Oscilloscope

..............08.

viil

442

Oscilloscope

dimensions.........

1-6

Commonly

used

power

plugs

........

2-2

Power

switch

locations

bottom

the

442

2-2

Power

input

fuse

location

the

442

back

panel...

ees

2-3

Crt

Display

and

Power

front

panel

controls

and

connectors

..............-+--

2-3

External

AXIS

INPUT

connector

the

back

panel

the

442

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

2-4

Controls

and

switches

accessible

through

the

bottom

the

442

cabinet

........

2-5

Vertical

system

controls

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

2-5

Horizontal

system

controls

..........

2-6

Triggering

system

controls

..........

2-7

Probe

Compensation

...........05.

2-9

Display

0.5

PROBE

ADJ

output

signal

2-10

Measuring

peak-to-peak

voltage

wavefOrm

occ

ene

2-11

Measuring

instantaneous

voltage

with

respect

reference

voltage

........

2-11

Measuring

the

time

duration

between

points

waveform

.........

0006,

2-14

Measuring

rise

time

............08,

2-15

Measuring

time

difference

between

two

PUISES

2-15

Measuring

phase

difference..........

2-16

Phase

difference

measurement

with

X-Y

display

...

2-17

Sweep

generator

and

sweep

gate

timing

diagram...

3-9

Foldback

circuit

action

..........004

3-10

Vertical

deflection

accuracy

test

setup

4-5

Bandwidth

check

test

setup..........

4-7

Triggering

and

Z-Axis

input.check

test

SQCtUD.

eee

4-9

Timing

accuracy

check

test

setup

.....

4-114

442

cabinet

removal

............0-.

4-13

Moving

Interface

board

adjustment

access

position

.........0

eee

nee

4-15

Low-voltage power

supply

adjustment

location.

ees

4-17

Fig.

No.

4-8

4-9

4-10

4-11

4-12

4-13

5-9

Page

Interface

board

adjustment

locations

(board

shown

access

position)......

4-18

Vertical

attenuator,

preamplifier,

delay

line

driver,

and

trigger

level

adjustment

locations

2.2...

ees

4-21

Display

correct

(idealized)

attenuator

compensation

........-.-.0.0008-

4-21

Horizontal

adjustment

locations

A14

Horizontal

Output

board

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

4-23

Horizontal

adjustment

locations

A12

Horizontal

board

and

A114

Trigger

Switch

board

2...

eee

4-24

Triggering

and

X-Axis

adjustment

locations

the

A1i

Trigger

Switch

board

......

4-26

Cabinet

removal...............0485.

5-1

Moving

Interface

board

access

position

5-3

Color

codes

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

5-5

Semiconductor

lead

configuration

.....

5-6

Multi-pin

connector

holder

indexing.

...

5-7

connector

re-installation

multi-pin

Holders

eee

5-15

Shaft-knob

assembly

removal

........

5-17

Attenuators,

Attenuator

Shift,

Horizontal

Output,

and

Power

Supply

assembly

rEMOVAl

5-17

Interface,

Trigger

Switch,

Horizontal,

and

Timing

(SEC/DIV

switch)

assemblies

rEMOVAl

5-19

The

following

illustrations

are

located

foldout

pages

Section

Diagrams

and

Circuit

Board

Hlustrations.

A6—CH

Attenuator

circuit

board

component

locations

A7—CH

Attenuator

circuit

board

component

locations

Attenuator

circuit

board

locations

442

Oscilloscope

block

diagram

A8—Vertical

circuit

board

component

locations

Vertical

circuit

board

location

REV

MAY

1980

442

Service

LIST

ILLUSTRATIONS

(cont)

Fig.

No. No.

7-7

Ai—Interface

circuit

board

component

7-11

A1l2—Horizontal

circuit

board

locations

7-12

Horizonta!

circuit

board

location

7-8

Interface

circuit

board

location

7-13

A14—Horizontal

Output

circuit

board

7-9A

All-Trigger

Switch

circuit

board

component

locations

component

locations

for

B021532

and

7-14

Horizontal

Output

board

location

7-15

A2—Power

Supply

circuit

board

7-9B

All—Trigger

Switch

circuit

board

component

locations

component

locations

for

below

7-16

Power

Supply

board

location

BO21532

7-17

442

Oscilloscope

troubleshooting

chart

7-10

Trigger

Switch

circuit

board

location

REV

MAY

1980

iii

442

Service

LIST

TABLES

Table

No.

Page

1-1

Electrical

Characteristics............

1-1

1-2

Environmental

Characteristics

........

1-4

1-3

Physical

Characteristics

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

1-5

2-1

Power

Cord

Conductor

identification

...

2-1

2-2

Regulating

Ranges

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

2-2

2-3

Power

Input

Fuse

Values............

2-2

3-1

Attenuator

and

Gain

Switching

Sequence

3-3

4-1

Test

Equipment

Required

...........

4-1

4-2

Vertical

Deflection

Accuracy

.........

4-5

4-3

Sweep

Rate

Timing

Accuracy

........

4-10

5-1

Power

Supply

Tolerance

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

5-8

5-2

Relative

Susceptibility

Static

Discharge

Damage............

0...

eee

5-13

5-3

Maintenance

Aids..............-4.

5-23

REV

MAY

1980

442

Service

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

damageto

the

equipment

other

property.

WARNING

statements

identify

conditions

practices

that

could

result

personal

injury

loss

life.

Terms

Marked

Equipment

CAUTION

indicates

personal

injury

hazard

not

im-

mediately

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

This

symbol

indicates

where

applicable

cautionary

other

information

found.

Symbols

Marked

Equipment

DANGER

—

High

voltage.

Protective

ground

(earth)

terminal.

ATTENTION

—

refer

manual,

Power

Source

This

product

intended

operate

from

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

power

cord

essential

for

safe

operation.

REV

MAY

1980

Grounding

the

Product

This

product

grounded

through

the

grounding

conduc-

tor

the

power

cord.

avoid

electrical

shock,

plug

the

power

cord

into

properly

wired

receptacle

before

connecting

the

product

input

output

terminals.

protective

ground

connection

way

the

grounding

conductor

the

power

cord

essential

for

safe

opera-

tion.

Danger

Arising

From

Loss

Ground

Upon

loss

the

protective-ground

connection,

all

accessible

conductive

parts

(including

knobs

and

con-

trols

that

may

appear

insulating)

can

render

electric

shock.

Use

the

Proper

Power

Cord

Use

only

the

power

cord

and

connector

specified

for

your

product.

Use

only

power

cord

that

good

condition.

For

detailed

information

power

cords

and

connectors,

see

Operating

Instructions

section.

Refer

cord

and

connector

changes

qualified

service

personnel.

Use

the

Proper

Fuse

avoid

fire

hazard,

use

only

the

fuse

correct

type,

voltage

rating

and current

rating

specified

the

parts

list

for

your

product.

Refer

fuse

replacement

qualified

service

personnel.

Not

Operate

Explosive

Atmospheres

avoid

explosion,

not

operate

this

product

explosive

atmosphere

unless

has

been

specifically

certified

for

such

operation.

Not

Remove

Covers

Panels

avoid

personal

injury,

not

remove

the

product

covers

panels.

not

operate

the

product

without

the

covers

and

panels

properly

installed.

442

Service

SERVICE

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

connec-

tions

and

components

while

power

on.

REV

MAY

1980

Disconnect

power

before

removing

protective

panels,

soldering,

replacing

components.

Power

Source

This

product

intended

operate

from

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

power

cord

essential

for

safe

operation.

vii

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