Tektronix 532 Manual de usuario

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INSTRUCTION

MANUAL

S.W.

Millikan

Way

•

P.O.

Box

500

•

Beaverton,

Oregon

•

Phone

MI

4-0161

•

Ca les:

Tektro

nix

[

E

E

WARRANTY

E

E

'n

All

Tektronix

instruments

are

warranted

against

de ective

materials

and

workman



ship

or

one

year.

Tektronix

trans ormers,

manu actured

in

our

own

plant,

are

war



ranted

or

the

li e

o

the

instrument.

Any

questions

with

respect

to

the

war



ranty

mentioned

above

should

be

taken

up

with

your

Tektronix

Field

Engineer.

Tektronix

repair

and

replacement-part

service

is

geared

directly

to

the

ield,

there



ore

all

requests

or

repairs

and

replace



ment

parts

should

be

directed

to

the

Tek



tronix

Field

O ice

or

Representative

in

your

area.

This

procedure

will

assure

you

the

astest

possible

service.

Please

include

the

instrument

Type

and

Serial

number

with

all

requests

or

parts

or

service.

Speci ications

and

price

change

priv



ileges

reserved.

■

Copyright

©

1960

by

Tektronix,

Inc.,

Beaverton,

Oregon.

Printed

in

the

United

States

o

America.

All

rights

reserved.

Con



tents

o

this

publication

may

not

be

repro



duced

in

any

orm

without

permission

o

the

copyright

owner.

CONTENTS

E

2

E

J

Section

1

Specifications

Section

2

Operating

Instructions

Section

3

Circuit

Description

Section

4

Maintenance

Section

5

Cali ration

Procedure

Section

6

Plug-In

Characteristics

Section

7

Parts

List

and

Schematics

Section

8

Accessories

E

J

L

2

£

J

Type

532

AA

L

2

:

j

AA

Type

532

ON

1

General

Type

532

AA

The

Tektronix

Type

532

Oscilloscope

is

a

high-performance

medium-speed,

la oratory

instrument

with

plug-in

preamplifiers.

It

is

specially

engineered

to

get

extra

dependa ility

through

circuit

simplicity

and

conservative

tu e

loading.

While

achieving

the

extra

depend



a ility

o taina le

with

fewer

tu es

more

con



servatively

loaded,

the

Type

532

has

retained

the

same

precision

and

sta ility

expected

of

Tektronix

oscilloscopes,

com ined

with

per



formance

characteristics

that

will

take

care

of

most

of

the

demands

of

a

la oratory.

Letter

Series

plug-in

units

fit

the

Type

532.

All

the

versatility

of

these

plug-in

units

is

thus

availa le,

limited

only

y

the

5

-megacycle

pass

and

of

the

Type

532.

Vertical

Deflection

System

Output

Amplifier

Frequency

Response

-

de

to

5

me.

Risetime

-

.06

microseconds.

Linear

Deflection

-

8

cm.

Horizontal

Deflection

System

Sweep

Range

Twenty

-one

cali rated

speeds

from

1

µsec/cm

to

5

sec/cm.

Accuracy

-

3

per

cent.

Continuously

varia le,

uncali rated,

etween

ranges

and

to

12

sec/cm.

Magnifier

Expands

sweep

5

times

to

right

and

left

SPECIFICATIONS

of

screen

center.

Extends

fastest

sweep

speed

to

.2

µsec/cm.

Accuracy

-

5

per

cent.

Un lanking

-

DC

coupled.

Trigger

Requirements

Internal

-

2

mm

of

deflection.

External

-

.2

volts

to

40

volts.

Frequency

range

-

de

to

5

me.

Horizontal

Input

Deflection

Factor

Continuously

varia le,

.2

v/cm

to

20

v/cm.

Frequency

Response

-

de

to

300

kc.

Other

Characteristics

Cathode-Ray

Tu e

Type

T52P2

Pl,

P7

and

Pll

phosphors

optional.

Accelerating

Potential

-

4,000

volts.

Deflection

Factor

at

Plates

Vertical

-

9

v/cm.

Horizontal

-

22

v/cm.

Voltage

Cali rator

Eighteen

fixed

voltages

from

.2

milli



volts

to

100

volts,

peak-to-peak.

Accuracy

-

3

per

cent.

Waveform

-

square

wave

at

a out

1

kc.

AA

Specifications

-

Type

532

1-1

Output

Waveforms

Availa le

Power

Supply

Positive

gate

of

same

duration

as

sweep,

20

volts.

Sweep

Sawtooth

waveform,

150

volts.

Delayed

gate

with

delay

adjusta le

throughout

the

period

of

the

sweep

and

lasting

for

the

duration

of

the

sweep,

20

volts.

A

sample

of

the

vertical

signal,

pass-

and

de

to

2.5

me

with

a

50

µµf

capac



itive

load.

Output:

.9

volts

per

cm

of

deflection.

Vertical

Beam-Position

Indicators

Indicator

lights

show

direction

of

eam

when

it

is

positioned

off

the

screen

vertically.

Electronic

Regulation

Power

Requirements

-

105

to

125,

or

210

to

250

V,

50-60

cycles,

475

watts

with

the

Type

D

Plug-In

Unit.

Mechanical

Specifications

Ventilation

-

filtered

forced-air

ventilation.

Finish

-

photo-etched,

anodized

panel,

lue

wrinkle

enameled

ca inet.

Dimensions

-

25

”

long,

13"

wide,

16

3/4"

high.

Weight

-

52

pounds.

Fonctions

o

Controls

and

Connectors

TRIGGERING

MODE

(red

kno )

Four-position

switch

arranges

trigger

circuits

for

four

kinds

of

triggering:

AUTOMATIC,

AC

FAST,

AC

SLOW

and

DC.

TRIGGER

SLOPE

Six-position

switch

selects

source

of

trigger

signal

and

converts

to

negative-going

output,

either

negative-going

or

positive

going

input.

TRIGGER

INPUT

Coaxial

connector

to

triggering

circuits

through

EXT.

positions

of

TRIGGER

SLOPE

switch.

STABILITY

Control

for

adjusting

the

sta ility

of

the

sweep

circuits

for

a

sta le

supply.

The

control

has

a

PRESET

position

suita le

for

most

triggering

applications.

TIME/CM

Eight-position

switch

selects

timing

capacitors

to

determine

sweep

speeds,

and

determine

duration

of

trigger

-holdoff

period.

MULTIPLIER

Six-position

switch.

Three

positions

place

precision

charging

resistors

in

series

with

timing

capacitors

to

determine

sweep

speeds

in

conjunction

with

selected

timing

capacitor.

Three

positions,

marked

in

red,

place

adjusta le

charging

voltages

in

series

with

timing

capacitors

for

continuous

control

of

sweep

speeds.

5X

MAGNIFIER

(red

kno )

Two-position

switch

removes

or

inserts

attenuator

in

sweep

amplifier

to

change

sweep

speeds

y

a

factor

of

five.

HORIZONTAL

DISPLAY

Three-position

switch

connects

sweep

amplifier

to

internal

sweep

generator

in

one

position,

or

to

front

panel

connector

directly

or

through

10-1

fixed

attenuator

in

second

and

third

positions.

1-2

Specifications

-

Type

532

AA

EXTERNAL

SWEEP

ATENUATOR,

10-1

Continuously

adjusta le

gain

control

on

horizontal

amplifier.

Switched

out

of

circuit

for

internal

sweeps.

EXTERNAL

SWEEP

IN

Front-panel

connector

to

horizontal

amplifier

through

HORIZ



ONTAL

DISPLAY

switch.

Magnifier

must

e

switched

to

ON

for

undistorted

10

-cm

deflection.

HORIZONTAL

POSITION

Positions

trace

along

horizontal

axis.

SQUARE

-WAVE

CALIBRATOR

( lack

kno )

Nine-position

switch

selects

nine

taps

on

precision

voltage

divider

in

cali rator

circuit.

Provides

accurate

voltages

of

.2,

.5,

1,

2,

5,

10,

20,

50,

and

100

volts

in

VOLTS

position,

or

milli



volts

in

the

MILLIVOLTS

position

of

the

red

concentric

control

kno .

MILLIVOLTS

-

VOLTS

1000

-to-

1

voltage

divider

to

give

either

volts

or

millivolts

output.

CAL

OUT

UHF

coax

front-panel

connector

from

the

cali rator.

VERT

SIG

OUT

Front-panel

inding

post

supplies

a

sample

of

the

vertical

signal

for

operation

of

auxiliary

equipment.

+

GATE

OUT

Front-panel

inding

post

supplies

positive

20-volt

square

pulse,

de

coupled

through

cathode

follower,

synchronized

with

the

internal

sweep.

SAWTOOTH

OUT

Front-panel

inding

post

supplies

150-volt

positive-going

saw



tooth

de

coupled

through

cathode

follower,

synchronized

with

the

internal

sweep.

GATE

DELAY

Front-panel

control

adjusts

delay

time

of

delayed

gate.

Delay

is

adjusta le

y

any

percentage

of

the

sweep-sawtooth

time.

DELAYED

GATE

Front-panel

connector

de

connected

to

cathode-follower

output

delivers

20-volt

positive-going

gate

delayed

according

to

the

setting

of

the

GATE

DELAY

control.

POWER

On-off

switch

primary

of

power

transformer

and

ventilating-

fan

lead.

FOCUS

Adjusta le

voltage

for

the

cathode-ray

tu e

focusing

grid.

INTENSITY

Bias

adjustment

to

cathode-ray

tu e

control

grid.

ASTIGMATISM

Adjusta le

voltage

for

the

astigmatism

grid

of

the

cathode



ray

tu e.

SCALE

ILLUM

Adjusta le

series

resistor

controls

the

voltage

across

the

graticule

lights.

Beam-position

indicators,

unla eled,

marked

with

arrows.

The

arrow

nearest

the

illuminated

indicator

shows,

which

way

the

eam

is

off

the

screen

if

it

cannot

e

seen.

AA

Specifications

-

Type

532

1-3

Rear

of

Ca inet

CRT

CATHODE

Binding

post

connects

to

crt

cathode

through

high-voltage

capacitor.

Input

impedance

8k

to

15k.

Discharge

time

constant

a out

15

milliseconds.

Preliminary

Instructions

Cooling

e

used

to

convert

deflections

in

centimeters

into

volts

and

seconds.

Vertical

sensitivities

are

cali rated

in

volts

per

centimeter,

and

horizontal

sweep-times

are

cali rated

in

sec-

The

Type

532

Oscilloscope

is

cooled

y

filtered,

forced-air

ventilation.

The

instrument

must

therefore

e

placed

so

the

air

intake

is

not

locked,

and

the

filter

must

e

clean

enough

to

permit

adequate

air

circulation.

If

the

interior

temperature

does

rise

too

high

for

some

reason,

a

thermal

cutout

switch

will

disconnect

the

power

and

keep

it

disconnected

until

the

temperature

drops

to

a

safe

value.

Cathode-Ray

Tube

Controls

The

Tektronix

Type

T52

Cathode-ray

tu e

in

this

instrument

has

a

total

accelerating

voltage

of

4,000

volts.

The

spot

intensity

with

this

amount

of

acceleration

can

e

right

enough

to

damage

the

screen

if

the

spot

is

left

in

one

place.

Be

careful

not

to

leave

a

fixed

right

spot

on

the

screen.

Turn

the

INTENSITY

control

counterclockwise

so

that

the

spot

is

dim

whenever

you

leave

the

instru



ment

unattended.

The

separate

FOCUS,

ASTIGMATISM

and

INTENSITY

controls

are

somewhat

interdepend



ent,

and

may

require

readjustment

for

different

INTENSITY

control

settings.

onds

per

centimeter

which

if

multiplied

y

centimeters

of

deflection

,

give

volts

andseconds.

The

graticule

can

e

mounted

in

either

of

two

positions

rotated

180

degrees

from

each

other.

In

one

position,

the

graticule

illumination

is

colored

red,

and

in

the

’

other

position

in

white.

The

white

will

reproduce

well

photo



graphically.

First-Time

Operation

First

get

a

trace

on

the

screen

y

the

simplest

method,

and

then

proceed

with

the

presentation

you

want

after

you

get

an

idea

of

the

functions

of

the

controls.

To

get

a

trace

on

the

screen,

insert

a

preamplifier,

for

example

the

Type

D,

and

proceed

as

follows

:

Turn

the

POWER

switch

to

OFF.

Connect

the

power

cord

to

a

source

of

117

-volt,

60-

cycle

power.

Then

set

the

front-panel

controls

as

follows:

INTENSITY

Counterclockwise

(CCW)

Illuminated

Graticule

FOCUS

center

The

adjusta le

graticule-lighting

control,

la eled

SCALE

ILLUM.

,

can

e

adjusted

to

suit

the

lighting

conditions

of

the

room.

The

colored

filter

supplied

is

colored

to

provide

the

maximum

trace

contrast

for

the

P2

phosphor

in

the

presence

of

room

light;

The

graticule

is

accurately

scri ed

in

centi



meters

and

fifths

of

centimeters.

These

scale

markings

and

the

cali rated

fixed

vertical



deflection

sensitivities

and

sweep

times,

can

ASTIGMATISM

POWER

TRIGGERING

LEVEL

STABILITY

(red

kno )

TRIGGER

SLOPE

center

ON

CCW

CW

(S/N

101-5419)

CCW

(S/N

5420-5665)

PRESET

(S/N

5666-up)

+

INT.

1-4

Specifications

-

Type

532

AA

AA

Operating

Instructions

-

Type

532

2-1

TRIGGERING

MODE

(red)

AUTOMATIC

TIME/CM

100

MICROSEC

MULTIPLIER

2

HORIZONTAL

DISPLAY

INTERNAL

SWEEP

HORIZONTAL

POSITION

center

SQUARE-WAVE

CALIBRATOR

2

VOLTS,

MILLIVOLTS,

OFF

VOLTS

Connect

a

lead

from

the

INPUT

A

terminal

of

the

Type

D

Preamp

to

the

CAL.

OUT

terminal.

INPUT

SELECTOR

INPUT

A,

AC

MILLIVOLTS/CM

100

VERTICAL

POSITION

center

MV/CM

MULTIPLIER

50

VARIABLE

Clockwise

(CW)

When

the

POWER

switch

has

een

turned

on

for

a out

one

minute,

turn

the

INTENSITY

control

clockwise

until

you

can

see

a

trace

on

the

screen.

Now

ack

off

the

red

STABILITY

kno

at

the

top

center

of

the

oscilloscope

until

the

waveform

is

sta le

(S/N

101-5419).

Adjust

the

FOCUS,

INTENSITY

and

ASTIG



MATISM

controls

for

a

sharp

line.

Position

the

trace

near

the

screen

center

with

the

HORIZONTAL

POSITION

and

the

VERTICAL

POSITION

controls.

Triggering

Mo es

Automatic

You

are

now

displaying

the

cali rator

wave



form,

whose

repetition

rate

is

a out

one

kilo



cycle,

and

whose

amplitude

is

two

volts,

peak-

to-peak,

with

the

AUTOMATIC

mode

of

trigger



ing.

This

is

the

simplest

mode

of

triggering.

It

is

useful

for

general

purpose

viewing,

and

will

operate

satisfactorily

for

a

wide

variety

of

trigger

signals

whose

repetition

rates

are

etween

sixty

cycles

and

a out

two

megacycles.

AC

Slow

When

you

have

a

good,

well

focused

trace

of

the

cali rating

waveform

y

the

AUTOMATIC

mode

of

triggering,

try

the

other

three

TRIG



GERING

MODE

switch

positions.

Turn

the

switch

to

the

AC

SLOW

position.

Leave

the

STABILITY

control

where

you

had

it

set

for

the

AC

AUTO

triggering

or

advance

it

until

the

sweep

starts

and

ack

it

off

a out

ten

degrees

(S/N

101-5665).

Advance

the

TRIGGER



ING

LEVEL

control

clockwise

until

you

get

a

sta le

trace

again.

There

may

e

a

con



sidera le

range

of

the

TRIGGERING

LEVEL

control

over

which

you

can

get

a

sta le

trace,

and

the

start

of

the

trace

will

move

up

and

down

the

edge

of

the

square

wave

within

this

range.

Notice

that

the

trace

starts

on

the

upgoing

part

of

the

cali rator

square

wave.

Now

turn

the

TRIGGER

SLOPE

switch

to

the

-INT.

position,

and

readjust

the

TRIGGERING

LEVEL

to

o tain

a

sta le

trace

again.

Notice

now

that

the

trace

starts

on

the

down-going

portion

of

the

trace

and

that

the

position

of

the

start

can

again

e

changed

somewhat

with

the

TRIGGERING

LEVEL

control.

DC

Triggering

Now

turn

the

TRIGGERING

MODE

switch

to

DC.

Adjust

the

LEVEL

control

for

straight

triggering,

and

then

position

the

trace

with

the

VERTICAL

POSITION

control.

You

will

notice

that

triggering

occurs

at

a

vertical

level

on

the

screen

selected

y

the

LEVEL

control

and

that

the

triggering

point

changes

relative

to

the

waveform

as

the

waveform

is

positioned

vertically.

This

effect

will

e

more

noticea le

if

you

look

at

a

low-frequency

sine

wave.

This

triggering

position

is

most

useful

for

low-frequency

signals.

It

is

not

suita le

for

applications

where

the

de

level

is

changing

such

as

when

the

Type

CA

Dual-Trace

Unit

is

eing

used.

AC

Fast

In

the

AC

FAST

position

of

the

TRIGGERING

MODE

switch,

the

circuit

is

quite

similar

to

that

in

the

AC

SLOW

position,

and

you

will

notice

no

difference

when

displaying

the

cali rator

waveform.

The

only

difference

is

that

an

rc

filter

is

inserted

in

the

circuit,

making

it

insensitive

to

low

frequencies,

and

allowing

it

to

recover

quickly

from

de

level

changes.

This

is

the

position

to

use

when

there

is

low-frequency

hum

present

or

when

you

are

using

the

alternate

sweep

feature

of

the

Type

CA

Dual-Trace

unit,

and

you

are

looking

at

high-frequency

signals.

General

Triggering

Instructions

The

triggering

system

is

very

flexi le

and

sta le.

Once

you

get

the

feel

of

the

instrument

you

will

find

it

will

trigger

successfully

on

the

most

difficult

triggering

waveforms.

It

will

pro a ly

help

if

you

go

through

the

four

procedures

again

a

time

or

two.

If

you

are

already

familiar

with

the

Tektronix

Type

315

Oscilloscope

triggering

system,

you

will

know

how

to

operate

the

controls

of

the

Type

532.

If

you

have

not

had

experience

with'

this

kind

of

triggering

system,

however,

you

will

pro a ly

need

some

explanation,

partic



ularly

if

you

have

een

using

Tektronix

Type

511,

512,

513

or

524

Oscilloscopes.

In

the

new

triggering

circuits

,

the

TRIGGER



ING

LEVEL

control

determines

at

what

point

on

the

instantaneous

triggering

voltage

trigger



ing

will

occur.

This

control

is

therefore

not

a

sensitivity

control.

For

small

trigger

signals

and

with

ac

coupling,

the

TRIGGERING

LEVEL

control

will

need

to

e

set

near

zero.

Settings

elow

zero

will

cause

triggering

at

a

time

when

the

triggering

voltage

is

negative,

with

respect

to

its

average

level.

Positive

set



tings

will

cause

triggering

only

at

a

time

when

the

triggering

voltage

is

positive.

The

red

STABILITY

control

kno

controls

the

ias

on

the

sweep

multivi rator.

It

there



fore

performs

a out

the

same

function

as

the

sta ility

controls

in

other

Tektronix

oscillo



scopes.

For

recurrent

operation,

advance

the

control

clockwise

until

a

recurrent

trace

appears.

For

triggered

operation,

retard

the

control

from

this

position

counterclockwise

ten

or

fifteen

degrees.

For

most

triggering

signals,

the

PRESET

position

will

provide

a

sta le

display

without

the

need

for

adjusting

the

STABILITY

control

(S/N

5666

-up).

For

triggered

operation,

you

will

also

need

to

adjust

other

trigger

controls

to

select

the

source

of

trigger

signals,

and

the

level,

speed,

and

direction

of

slope

of

the

triggering

waveform.

The

TRIGGER

SLOPE

switch

selects

the

source

of

trigger

signals

and

determines

whether

triggering

will

occur

on

the

positive-going

or

the

negative-going

portions

of

the

triggering

waveform.

Simplifie

Trigger

Circuit

Diagrams

The

simplified

diagrams

of

the

triggering

circuits

showing

the

method

of

trigger-slope

inversion

and

the

circuit

changes

performed

y

the

TRIGGERING

MODE

switch

may

help

you

to

understand

the

use

of

the

functions

availa le

in

the

Type

532

Oscilloscope.

The

following

descri es

the

circuit

operations

in

terms

of

the

simplified

diagrams:

The

trigger

inverter

stage

is

a

cathode

coupled

amplifier.

The

slope

polarity

of

the

output

pulse

must

e

negative

to

suit

the

rest

of

the

circuits

that

follow,

so

the

trigger

signal

is

connected

to

the

amplifier

so

as

to

produce

inverted

output

for

positive

signals,

or

in-phase

output

for

negative

signals.

The

TRIGGER

SLOPE

switch

determines

whether

inverted

or

in-phase

output

results,

y

con



necting

either

one

grid

or

the

other

to

the

trigger

source.

The

trigger-shaper

circuit

makes

a

sharp

pulse

out

of

the

trigger

signal,

and

determines

at

what

voltage

level

on

the

trigger

signal

the

sharp

trigger

pulse

will

e

generated.

The

trigger

shaper,

shown

on'

the

right,

is

a

two-stage

amplifier

circuit,

with

two

tu es

coupled

together

through

a

common

cathode

resistor.

The

iases

of

the

two

tu es

are

set

so

that

the

input

tu e

is

conducting

while

the

output

tu e

is

not

when

no

triggering

signal

is

preset.

When

the

triggering

signal

pulls

the

input

grid

downward

far

enough

it

passes

the

level

of

the

grid

of

the

output

section.

Then

the

output

section

conducts

and

the

input

section

cuts

off,

as

the

grid

goes

on

elow

the

cathode.

¾

■■

1

The

de

level

of

the

cathode

is

esta lished

y

the

de

input

grid

voltage

when

no

triggering

signal

is

preset.

The

input

grid

voltage

is

determined

y

the

setting

of

the

TRIGGERING

LEVEL

control,

which

sets

the

plate

voltage

2-2

Operating

Instructions

-

Type

532

AA

AA

Operating

Instructions

-

Type

532

2-3

of

the

trigger

inverting

stage

and

there y

sets

the

grid

voltage

of

the

trigger

shaping

stage.

The

trigger

input

signal

to

the

shaper

stage

thus

consists

of

the

de

level

which

can

e

adjusted,

plus

the

amplified

signal

from

the

inverter

stage.

By

adjusting

the

TRIGGERING

LEVEL

control

,

you

can

therefore

choose

what

part

of

trigger

signal

will

operate

the

shaping

stage

and

produce

a

pulse

at

its

output

plate.

Additional

functions

of

the

TRIGGERING

MODE

switch

rearrange

the

circuits

to

accom



modate

dc-coupled

triggering,

and

slow

or

fast

ac-coupled

triggering.

The

trigger

shaper

is

a

type

of

multivi rator

in

which

regeneration

causes

fast

transition

etween

two

sta le

states,

regardless

of

how

slowly

the

triggering

signal

passes

the

triggering

level.

For

de

coupling,

the

trigger-inverter

grid

is

de

coupled

to

the

input

signal.

For

ac

coupling,

the

trigger-inverter

grid

is

coupled

through

a

capacitor.

For

SLOW

AC,

the

time

constant

of

the

coupling

circuit

is

relatively

long,

a out

a

millisecond.

For

FAST

AC,

the

coupling

time

constant

is

much

shorter,

a out

10

microseconds,

so

that

the

circuit

will

not

respond

to

slowly

changing

components

in

the

triggering

waveform.

For

example,

the

AC

FAST

circuit

will

reject

60-cycle

hum

com



ponents,

and

trigger

successfully

on

a

desired

higher

frequency

when

oth

are

present

in

the

triggering

waveform.

For

the

dc-triggering

position,

the

input

grid

of

the

inverter

stage

assumes

the

actual

potential

of

the

input

signal,

including

oth

the

de

component

and

the

ac

component.

The

TRIGGERING

LEVEL

control

will

therefore

need

to

e

set

to

include

the

de

level

of

the

trigger

signal.

When

the

TRIGGERING

MODE

switch

is

in

the

AUTOMATIC

position

(AC

AUTO

position

S/N

101-5419),

the

input

grid

of

the

inverter

stage

is

separated

from

the

de

level

of

the

trigger

signal,

and

the

input

grid

of

the

trigger

shaper

stage

is

separated

from

the

de

level

of

the

inverter

plate

y

capacitors.

There

is

thus

no

de

coupling

etween

the

trigger

input

and

the

shaper.

The

trigger-shaper

stage

has

a

large

(3

-megohm)

resistor

connected

etween

plate

and

grid

in

this

switch

position,

so

that

the

stage

oscillates

at

a out

50

cycles

per

second,

depending

on

the

time

constant

of

the

coupling

capacitor

into

the

input

grid

and

the

3

-megohm

resistor.

The

input

grid

rises

and

falls

a out

five

volts

in

roughly

a

sawtooth

waveform

at

the

fifty-cycle

rate.

Each

time

the

grid

reverts

from

the

negative-going

direction

to

the

positive

-

going

direction,

the

output

plate

triggers

the

sweep

on

the

scope,

so

that

at

least

a

zero-

line

trace

is

present

whether

an

external

source

of

trigger

signal

is

present

or

not.

At

any

time

during

the

negative-going

excur



sion

of

the

sawtooth,

a

superimposed

negative

trigger

signal

can

drive

the

input

grid

of

the

shaper

tu e

to

cut-off

and

start

a

triggered

sweep

at

that

instant.

Recurrent

pulses

etween

sixty

cycles

and

2

me

will

synchronize

the

sweep

in

the

AUTOMATIC

position

(AC

AUTO

position

S/N

101-5419).

This

triggering

mode

is

useful

ecause

it

will

maintain

a

sweep,

so

that

any

signal

appearing

in

the

vertical

amplifier

can

e

displayed

whether

it

triggers

the

sweep

or

not,

and

ecause

it

will

provide

a

synchronized

sweep

over

a

wide

range

of

trigger

repetition

rates

with

no

need

for

readjustment

of

the

controls

.

Triggering

Controls

Sta

b

i

I

ity

This

control

sets

the

sweep

multivi rator

ias

one

side

or

the

other

in

the

region

of

recurrent

operation.

As

you

advance

the

con



trol

from

the

counterclockwise

position,

you

will

pass

a

setting

at

which

a

trace

will

appear

in

the

a sence

of

any

triggering

wave



form.

Usually

you

will

want

to

trigger

the

sweep,

and

for

triggered

sweeps

you

should

ack

the

STABILITY

control

counterclockwise

from

this

point

five

or

ten

degrees.

Or

turn

the

control

to

the

PRESET

position

(S/N

5666-

up).

If

you

want

to

stop

the

sweep

from

eing

triggered

at

all,

you

can

turn

this

control

counterclockwise

to

the

stop.

Triggering

Level

This

control

selects

the

point

on

the

trigger



ing

waveform

at

which

triggering

will

occur.

Turning

the

TRIGGERING

LEVEL

control

clock



wise

toward

the

+

sign

causes

the

sweep

to

e

triggered

during

positive

amplitudes

of

the

triggering

waveform.

Turning

the

TRIGGER



ING

LEVEL

control

in

the

-

direction

causes

the

sweep

to

e

triggered

during

negative

amplitudes.

Trigger

Slope

This

control

selects

the

source

of

triggering

signals,

and

determines

whether

the

sweep

is

triggered

during

positive-going

or

negative



going

portions

of

the

triggering

waveform.

Used

in

conjunction

with

the

TRIGGERING

LEVEL

control

the

polarity

functions

of

this

switch

permit

you

to

select

any

part

of

a

triggering

waveform

for

triggering

the

sweep.

How

far

you

must

turn

the

LEVEL

control

to

trigger

at

the

peak

of

a

triggering

wave



form

depends

on

the

amplitude

of

the

signal.

For

small

signals,

the

LEVEL

control

setting

will

always

need

to

e

near

zero,

or

near

the

de

level

if

there

is

a

de

component.

Increas



ing

the

amplitude

of

the

trigger

waveform

while

the

LEVEL

control

remains

constant

will

cause

the

triggering

point

to

phase

along

the

triggering

waveform.

Triggering

Mode

This

switch

arranges

the

circuits

for

single



sweep

triggering

on

three

kinds

of

triggering

waveforms,

and

for

recurrent

sweeps

which

can

e

synchronized.

The

AC

SLOW

position

is

suita le

for

signals

with

a

risetime

of

around

a

microsecond

or

slower.

The

DC

position

is

the

same

except

that

it

includes

the

de

component

of

the

triggering

waveform.

The

AC

FAST

position

is

suita le

for

rise



times

faster

than

10

microseconds,

although

there

is

considera le

overlap

etween

the

capa



ilities

of

the

circuits

in

the

SLOW

and

FAST

switch

positions.

The

AUTOMATIC

position

(AC

AUTO

position

S/N

101-5419)

makes

a

recurrent

trigger

signal

at

a out

a

50

-cycle

rate.

However,

it

will

synchronize

easily

with

recurrent

trigger

sig



nals

from

60

cycles

to

2

megacycles.

It

is

a

useful

function

for

displaying

signals

differ



ing

widely

in

amplitude

and

triggering

speed,

for

example,

in

signal-tracing

techniques,

and

also

for

maintaining

a

ase

line

to

show

that

the

oscilloscope

is

functioning

when

there

is

no

signal.

(In

this

mode,

the

STABILITY

con



trol

is

not

used.

Instead,

an

internal

control

is

connected

into

the

circuit

that

has

een

preset

for

optimum

triggering

over

a

wide

range

of

triggering

signals.

S/N

5666

-up).

(The

STABILITY

control

should

e

set

the

same

for

this

function

as

for

other

triggered

operation,

a out

five

or

ten

degrees

counter



clockwise

from

the

point

where

the

multi



vi rator

runs

recurrently.

At

the

fastest

sweep

speeds

the

ase

line

will

e

just

discerni le

when

there

is

no

signal

ecause

of

the

low

duty

cycle.

S/N

101-5665).

Sweep

Operation

Time/CM

and

Multiplier

The

TIME/CM

and

MULTIPLIER

controls

determine

the

speed

of

the

horizontal

trace.

The

time

per

centimeter

of

horizontal

deflection

is

equal

to

the

produce

of

the

MULTIPLIER

setting

and

the

TIME/CM

setting.

Times

per

centimeter

from

1

microsecond

to

1

second

in

steps

of

10

can

e

selected,

with

the

TIME/

CM

switch,

and

accurate,

fixed

multipliers

of

1,

2,

and

5

times

can

e

selected

with

the

MULTIPLIER

switch.

The

sweep

times

so

selected

can

e

depended

on

within

3

per

cent

of

their

indicated

value.

Mag

nl

ier

The

MAGNIFIER

control

inserts

or

removes

a

feed ack

network

in

the

sweep

amplifier

that

changes

the

gain

five

times.

The

linearity

of

the

amplifier

is

somewhat

etter

when

the

feed ack

circuit

is

included.

The

center

one

fifth

of

the

trace

is

extended

to

fill

the

graticule

when

the

magnifier

is

switched

on.

When

the

sweep

magnifier

is

on,

the

fastest

sweep

speed

is

increased

to

.2

microseconds

per

centimeter.

The

intensity

of

the

trace

is

reduced

when

the

magnifier

is

on

ecause

of

the

reduced

duty

cycle.

External

Sweep

In

the

X10

and

XI

positions

of

the

HORI



ZONTAL

DISPLAY

switch,

the

EXTERNAL

SWEEP

IN

inding

post

is

connected

to

the

horizontal

amplifier.

In

oth

of

these

positions

the

5X

MAGNIFIER

must

e

switched

to

ON

to

keep

the

input

amplifier

within

its

linear

range.

The

EXTERNAL

SWEEP

ATTENUATOR

10-1

can

e

used

in

conjunction

with

the

step

attenuator

to

give

a

100-1

attenuation

range.

2-4

Operating

Instructions

-

Type

532

AA

AA

Operating

Instructions

-

Type

532

2-5

+

3OOV

Auxiliary

Functions

Square

Wave

Calibrator

Accuracy

of

the

open-circuit

voltage

of

the

cali rator

is

within

3

per

cent

of

the

indicated

voltage.

However,

since

the

output

impedance

at

the

CAL.

OUT

terminal

varies

with

the

setting

of

the

voltage-selector

switch,

you

must

e

careful

that

the

load

impedance

you

connect

it

to

does

not

change

the

output

voltage.

The

output

impedance

reaches

a

maximum

of

a out

5,000

ohms

at

the

50

-volt

tap.

The

frequency

of

the

cali rator

multivi rator

is

nominally

1,000

cycles,

ut

may

vary

30

per

cent

either

way.

Vertical

Signal

Out

The

signal

applied

to

the

vertical

amplifier

is

availa le

at

the

front-panel

VERT.

SIGN.

OUT

inding

post.

A

signal

which

will

cause

one

centimeter

of

deflection

will

produce

a

signal

of

a out

.9

volts,

peak-to-peak,

at

the

inding

post.

The

pass and

is

dependent

on

the

external

load.

With

a

capacitive

load

of

50

µµf,

it

extends

from

de

to

2.5

megacycles

at

the

3

d

point.

Trace-Bri

g

htness

Modulation

To

couple

markers

or

the

signals

into

the

ert

cathode

for

rightness

information,

dis



connect

the

ground

strap

at

the

rear

of

the

instrument

and

connect

the

signal

to

the

CRT

CATHODE

inding

post.

The

input

impedance

is

a out

15,000

ohms.

The

circuit

is

ac

coupled

through

a

high-voltage

capacitor

with

an

rc

time

constant

of

a out

15

milliseconds.

Direct

Connection

to

De lection

Plates

(SN

5666

up)

A

plastic

plate

and

mounting

racket

is

availa le

from

the

factory

for

making

direct

connections

to

the

ert

vertical-deflection

plates.

The

mounting

racket

is

designed

to

clamp

around

the

neck

of

the

ert

shield,

adjacent

to

the

deflection-plate

connections.

When

mounted

correctly,

the

plate

will

e

accessi le

through

the

ert

deflection-plate

access

hole

in

the

left

side-panel.

The

racket

and

plate

may

e

ordered

with

or

without

the

necessary

parts

for

vertical-positioning

voltages.

Specify

part

num er

013-008

for

the

unwired

unit,

or

part

num er

013-007

for

the

wired

unit.

Holes

can

e

drilled

in

the

plastic

plate

for

mounting

coaxial

or

other

connectors.

The

two

pins

on

the

left-hand

side

of

the

ert

neck

are

the

vertical-deflection

plates.

S/N

101-5665

the

plastic

cover

on

the

side

of

the

case

allows

low

capacitance

direction

connection

to

the

deflection

plates.

Wire

guides

in

the

center

hold

the

leads

away

from

the

case.

The

two

pins

on

the

side

of

the

ert

are

the

vertical

deflection

plates

and

the

two

on

the

top

are

the

horizontal

deflection

plates.

To

avoid

distortion,

the

average

de

potential

on

the

vertical-deflection

plates

should

e

etween

150

and

250

volts.

If

you

use

a

different

voltage,

the

distortion

can

e

minimized

y

adjusting

the

GEOM.

ADJ.

control

at

the

rear

of

the

sweep

chassis.

(Unless

de

coupling

is

required,

connect

coupling

capacitors

in

series

with

the

leads

to

the

deflection

plates

and

connect

one-megohm

resistors

from

the

deflection

plates

to

the

leads

from

the

vertical

amplifier.

With

this

connection

the

plates

are

maintained

at

the

proper

operating

potential,

and

positioning

con



trol

is

retained

for

the

front-panel

VERTICAL

POSITION

control.)

S/N

5420-up.

Block

Diagram

The

Block

Diagram

shows

interconnections

of

the

functional

parts

of

the

oscilloscope,

except

the

power

supplies.

Functions

of

the

switches

are

shown

instead

of

their

actual

connections.

Vertical

Amplifier

Plug-In

Preampli iers

In

the

upper

left

of

the

Block

Diagram

is

shown

the

vertical-deflection

system.

The

lock

la eled

"plug-ins"

represents

one

of

the

several

plug-in

preamplifiers

availa le.

Units

are

availa le

with

a

wide

pass

and,

with

reduced

pass

and

and

higher

sensitivity

,

with

differential

input,

with

channel

switching

for

alternate

trace

presentation,

etc.

These

units

have

cali



rated

gain

controls

and

vertical

position

con



trols.

Connections

for

power

in

and

signal

out

are

made

through

a

multiple-contact

mating

plug

and

socket.

Output

from

these

units

is

push-pull

at

low

impedance.

Main

Unit

The

main

unit

contains

all

the

power

supplies,

the

sweep

system,

the

high-level

portions

of

the

vertical

amplifier

and

its

associated

circuits

,

the

cali rator,

and

the

cathode-ray

tu e.

The

driver

stage

feeds

the

vertical-deflection

signal

to

the

trigger-pickoff

circuits

that

supply

an

internally

derived

trigger

signal

to

trip

the

sweep

circuits

with

thé

o served

signal.

Trigger

Picko /

The

pickoff

circuit

supplies

a

sample

of

the

vertical-deflection

signal

to

the

TRIGGER

SLOPE

switch

for

triggering

purposes.

SECTION

3

CIRCUIT

DESCRIPTION

Vertical

Output

Ampli ier

This

amplifier

raises

the

signal

to

the

level

needed

for

the

vertical-deflection

plates

at

low

impedance.

Calibrato

r

The

cali rator

has

no

internal

connection

to

the

vertical-amplifier

system.

It

consists

of

a

symmetrical

multivi rator

with

a

cathode

-

follower

output

tu e

whose

cathode

resistor

is

a

cali rated

voltage

divider.

Sweep

Trigger

Mode

and

Trigger

Slope

Selectors

At

the

left

of

the

diagram

are

shown

the

functions

of

the

switches

that

select

the

source

and

slope

of

trigger

signals

and

arrange

the

circuits

to

accommodate

the

trigger

character



istics.

Trigger

Phase

Inverter

This

stage

provides

either

in-phase

or

inverted

output

so

as

to

provide

negative



going

output

for

either

negative-going

or

posi



tive-going

input

trigger

signals.

Trigger

Sha

per

The

trigger

-shaper

amplifier

makes

a

sharp

pulse

from

the

trigger

signal

at

a

time

during

the

sloping

part

of

the

trigger

signal

determined

y

the

setting

of

the

triggering-level

control.

A

sharpened

negative-going

pulse

triggers

the

multivi rator.

M

ultivibrator

The

multivi rator

turns

on

the

sweep

gen



erator

and

generates

the

ert-tu e

un lanking

pulse

when

it

is

switched

from

its

quiescent

2-6

Operating

Instructions

-

Type

532

AA

AA

Circuit

Description

-

Type

532

3-1

state.

The

sharp

negative-going

trigger

signal

from

the

trigger-shaper

circuit

trips

the

multi



vi rator,

which

thereafter

stays

in

the

second

state

until

the

sweep

generator

reverts

it

to

its

quiescent

state.

Sweep

Generator

The

sweep

generator

is

a

Miller

integrator

that

produces

a

positive-going

sawtooth

a out

150

volts

peak-to-peak.

The

sweep

generator

turns

itself

off

when

it

reaches

a

prescri ed

level

determined

y

the

sweep-length

control,

y

transmitting

a

signal

through

the

trigger-

holdoff

circuits

to

the

multivi rator.

Trigger

Holdo

The

trigger-holdoff

circuit

transmits

the

sweep

turn-off

signal

to

the

multivi rator

ut

riefly

holds

off

su sequent

trigger

signals

from

starting

the

sweep

again

until

all

parts

of

the

circuit

have

reached

their

quiescent

states.

Swee

p

Amp

li ier

The

sweep

amplifier

converts

the

sawtooth

output

of

the

sweep

generator

into

push-pull

output

at

low

impedance

at

the

level

required

to

sweep

the

eam

across

the

crt-tu e

screen.

The

amplifier

gain

can

e

increased

y

a

factor

of

five

for

sweep

magnification.

The

horizontal-positioning

control

operates

on

this

stage.

Unblanking

The

multivi rator

generates

the

positive



going

un lanking

pulse

at

the

same

time

it

turns

on

the

sweep

generator.

The

positive

pulse

is

transmitted

y

means

of

two

cathode

followers

through

a

floating

high-voltage

nega



tive

supply

to

the

control

grid

of

the

crt

tu e.

Delayed-Gate

Circuit

The

delayed-gate

circuit

is

a

ista le

multi



vi rator

which

changes

state

when

its

input

grid

is

raised

a ove

the

triggering

point

y

the

sawtooth

wave

of

the

sweep

generator..

An

adjusta le

ias

added

to

the

sawtooth

can

move

the

triggering

point

to

any

position

along

the

sawtooth.

A

positive

pulse

generated

y

the

multivi rator

is

transmitted

to

a

front

-

panel

connector

y

means

of

a

cathode-folio

wer.

The

positive

pulse

is

terminated

when

the

sawtooth

returns

negative.

External-Sweep

Ampli ier

The

external-sweep

amplifier

provides

a

means

of

using

external

sweep

voltage.

It

includes

a

fixed

attenuator

and

an

adjusta le

attenuation

control.

Choice

of

internal

or

external

sweep

can

e

made

y

means

of

the

HORIZONTAL

DISPLAY

switch.

The

sweep

magnifier

must

e

used

with

external

sweeps.

Power

Supply

Plate

and

Heater

Power

The

60-cycle

117-234-volt

transformer

has

four

separate

high-voltage

windings.

AC

output

from

each

winding

is

rectified

y

means

of

full



wave

rectifiers.

Rectified

de

output

is

filtered

with

capacitors

and

regulated

y

means

of

series

regulator

tu es.

Three

positive

voltages

of

350,

225

and

100

volts

are

referred

to

-150

volts

for

their

regulation.

The

negative

150

-volt

supply

is

referred

to

a

60

-volt

glow

tu e

for

its

regulation.

Catho e-Ray

Tube

High-Voltage

A

60-kc

vacuum-tu e

oscillator

has

the

primary

of

a

step-up

transformer

for

its

oscillator

inductance.

A

sample

of

the

rectified

secondary

voltage

is

compared

to

a

sta le

de

source,

and

the

difference

is

kept

constant

y

an

electronic

circuit

that

adjusts

the

oscillator

amplitude

of

oscillation

in

the

direction

to

reduce

any

change.

Three

vacuum

diodes

rectify

stepped-up

vol



tages

at

three

secondary

windings.

Two

recti



fiers

supply

positive

and

negative

accelerating

potentials

to

the

crt

tu e.

The

third

supplies

a

nearly

equal

negative

potential

to

the

control

grid

of

the

crt

tu e.

This

supply

floats

on

top

of

the

un lanking

pulse,

which

is

connected

in

series

with

it

to

ground

at

its

positive

end.

Color

Coding

We

use

color

coded

wires

in

this

instrument

to

help

you

identify

the

various

circuits.

The

ac

power

leads

are

yellow

and

coded

1-1-0

( rown- rown- rown)

following

the

RETMA

resistor

color

code.

The

+350-volt

us

is

white

and

coded

3-5-0

(orange-green- rown

eginning

with

the

widest

stripe).

The

-150-

volt

us

is

lack

and

coded

1-5-0.

The

heater

leads

are

coded

6-1,

6-2,

etc.,

not

to

indicate

that

the

voltages

are

different

ut

to

differentiate

etween

the

leads.

All

signal

leads

have

a

single

stripe.

A

few

wire

colors

are

indicated

y

small,

lower

case

letters

on

the

diagrams.

Air

Filter

The

Type

532

Oscilloscope

is

cooled

y

filtered

forced

air.

If

the

filter

gets

too

dirty

it

will

restrict

the

flow

of

cooling

air

and

may

cause

the

instrument

to

overheat.

The

filter

should

e

inspected

every

three

or

four

months

and

cleaned

or

replaced

if

necessary.

Two

types

of

air

filters

can

e

used

with

your

Tektronix

equipment.

A

washa le

air

filter

constructed

of

aluminum

wool

coated

with

an

adhesive

is

usually

supplied

with

your

instrument.

A

disposa le

glass-wool

is

availa le

through

your

local

Tektronix

field

office

or

direct

from

the

factory.

If

you

are

replacing

an

aluminum-type

filter

with

the

disposa le

glass-wool

type,

it

is

est

to

order

No.

378-009,

which

includes

two

ack-up

screens

that

help

to

prevent

damage

to

the

filter.

For

future

replacements

of

the

glass-wool

filter

only,

order

No.

378-012.

To

clean

the

aluminum

filter,

run

hot

water

through

it

from

the

side

that

was

inside.

Or

slosh

it

around

in

hot

soapy

water

and

rinse

it

in

clean

water.

Then

dry

it

thoroughly

and

coat

it

with

”

Filter

Coat

”

,

a

product

of

the

Research

Products

Corporation.

Pint

SECTION

4

MAINTENANCE

cans

are

availa le

under

the

name

"

Handi-

Koter"

from

some

air-conditioner

suppliers.

Other

adhesive

materials

are

no

dou t

satis



factory.

Fan

Motor

The

fan

motor

earings

will

require

oiling

every

few

months

or

every

thousand

hours

of

operation.

Use

a

good

grade

of

light

machine

oil,

and

apply

only

a

drop

or

two.

Soldering

and

Ceramic

Strips

Many

of

the

components

in

your

Tektronix

instrument

are

mounted

on

ceramic

terminal

strips.

The

notches

in

these

strips

are

lined

with

a

silver

alloy.

Repeated

use

of

excessive

heat,

or

use

of

ordinary

tin-lead

solder

will

reak

down

the

silver-to-ceramic

ond.

Occa



sional

use

of

tin-lead

solder

will

not

reak

the

ond

if

excessive

heat

is

not

applied.

If

you

are

responsi le

for

the

maintenance

of

a

large

num er

of

Tektronix

instruments,

or

if

you

contemplate

frequent

parts

changes,

we

recommend

that

you

keep

on

hand

a

stock

of

solder

containing

a out

3%

silver.

This

type

of

solder

is

used

frequently

in

printed

circuitry

and

should

e

readily

availa le

from

radio-supply

houses.

If

you

prefer,

you

can

order

the

solder

directly

from

Tektronix

in

one-pound

rolls.

Order

y

Tektronix

part

num



er

251-514.

Because

of

the

shape

of

the

terminals

on

the

ceramic

strips

it

is

advisa le

to

use

a

wedge-shaped

tip

on

your

soldering

iron

when

you

are

installing

or

removing

parts

from

the

strips.

Fig.

4-1

will

show

you

the

correct

shape

for

the

tip

of

the

soldering

iron.

Be

sure

and

file

smooth

all

surfaces

of

the

iron

which

will

e

tinned.

This

prevents

solder

from

uilding

up

on

rough

spots

where

it

will

quickly

oxidize.

3-2

Circuit

Description

-

Type

532

AA AA

Maintenance

-

Type

532

4-1

When

removing

or

replacing

components

mounted

on

the

ceramic

strips

you

will

find

that

satisfactory

results

are

o tained

if

you

proceed

in

the

manner

outlined

elow.

1.

Use

a

soldering

iron

of

a out

75-

watt

rating.

Fig.

4-1.

Soldering

iron

tip

correctly

shaped

and

tinned

2.

Prepare

the

tip

of

the

iron

as

shown

in

Fig.

4-1.

3.

Tin

only

the

first

1/16

to

1/8

inch

of

the

tip.

For

soldering

to

ceramic

terminal

strips

tin

the

iron

with

solder

containing

a out

3%

silver.

4.

Apply

one

corner

of

the

tip

to

the

notch

where

you

wish

to

solder

(see

Fig.

4-2).

Fig.

4-2.

Method

of

applying

heat

to

ceramic

strip.

5.

Apply

only

enough

heat

.

to

make

the

solder

flow

freely.

6.

Do

not

attempt

to

fill

the

notch

on

the

strip

with

solder;

instead,

apply

only

enough

solder

to

cover

the

wires

adequately,

and

to

form

a

slight

fillet

on

the

wire

as

shown

in

Fig.

4-3.

In

soldering

to

metal

terminals

(for

example

,

pins

on

a

tu e

socket)

a

slightly

different

technique

should

e

employed.

Prepare

the

iron

as

outlined

a ove

,

ut

tin

with

ordinary

tin-lead

solder.

Apply

the

iron

to

the

part

to

e

soldered

as

shown

in

Fig.

4-4.

Use

only

enough

heat

to

allow

the

solder

to

flow

freely

along

the

wire

so

that

a

slight

fillet

will

e

formed

as

shown

in

Fig.

4-3.

Dial

Fig.

4-3.

Note

the

slight

fillet

formed

on

a

correctly

soldered

joint.

General

Sol ering

Consi erations

When

replacing

wires

in

terminal

slots

clip

the

ends

neatly

as

close

to

the

solder

joint

as

possi le.

In

clipping

the

ends

of

wires

take

care

the

end

removed

does

not

fly

across

the

room

as

it

is

clipped.

Fig.

4-4.

Soldering

to

a

metal

pin.

Occasionally

you

will

wish

to

hold

a

are

wire

in

place

as

it

is

eing

soldered.

A

handy

device

for

this

purpose

is

a

short

length

of

wooden

dowel,

with

one

end

shaped

as

shown

in

Fig.

4-5.

In

soldering

to

terminals

pins

mounted

in

plastic

rods

it

is

necessary

to

use

some

form

of

"

heat

sink"

to

avoid

melting

the

plastic.

A

pair

of

long-nosed

pliers

(see

Fig.

4-6)

makes

a

convenient

tool

for

this

Fig.

4-5.

A

wooden

dowel

shaped

for

use

as

a

soldering

aid.

Ceramic

Strips

Two

distinct

types

of

ceramic

strips

have

een

used

in

Tektronix

instruments.

The

earlier

type

mounted

on

the

chassis

y

means

of

#4-40

olts

and

nuts.

The

later

is

mounted

with

snap-in,

plastic

fittings.

Both

styles

are

shown

in

Fig.

4-7.

To

replace

ceramic

strips

which

olt

to

the

chassis,

screw

a

#4-40

nut

onto

each

mounting

olt,

positioning

the

olt

so

that

the

distance

etween

the

ottom

of

the

olt

and

the

ottom

of

the

ceramic

strip

equals

the

height

at

which

you

wish

to

mount

the

strip

a ove

the

chassis.

Secure

the

nuts

to

the

olts

with

a

drop

of

red

glyptal.

Insert

the

olts

through

the

holes

in

the

chassis

where

the

original

strip

was

mounted,

placing

a

#4-40

lockwasher

etween

each

nut

and

the

chassis.

Place

a

second

set

of

#4-40

lock



washers

on

the

protruding

ends

of

the

olts,

Fig.

4-6.

Long-nosed

pliers

used

as

a

heat

sink.

and

fasten

them

firmly

with

another

set

of

#4-40

nuts.

Place

a

drop

of

red

glyptal

over

each

of

the

second

set

of

nuts

after

fastening.

Mounting

Later

Ceramic

Strips

To

replace

strips

which

mount

with

snap-

in

plastic

fittings,

first

remove

the

original

fittings

from

the

chassis.

Assem le

the

mount

ing

post

on

the

ceramic

strip.

Insert

the

nylon

collar

into

the

mounting

holes

in

the

chassis.

Carefully

force

the

mounting

post

into

the

nylon

collars.

Snip

off

the

portion

of

the

mounting

post

which

protrudes

elow

the

nylon

collar

on

the

reverse

side

of

the

chassis.

NOTE

Considera le

force

may

e

nec



essary

to

push

the

mounting

rods

into

the

nylon

collars.

Be

sure

that

you

apply

this

force

to

the

upper

ends

of

the

mounting

rods

rather

than

to

the

ceramic

strip.

Fig.

4-7.

Old

and

new

styles

of

ceramic

strips.

The

newer

ceramic

strips

mount

in

nylon

collars.

Trouble

Shooting

If

the

instrument

fails

to

operate

at

all,

including

the

fan

and

the

pilot

light,

check

the

source

of

power

and

determine

that

the

power

cord

plug

is

firmly

in

place.

Then

check

the

5

-amp

fuse

at

the

ack

of

the

instru



ment

near

the

power

receptacle.

If

the

fan

and

pilot

light

operate

ut

there

'is

no

spot

visi le,

there

is

a

possi ility

that

4-2

Maintenance

-

Type

532

AA AA

Maintenance

-

Type

532

4-3