Tektronix 502A User manual

Table of contents

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INSTRUCTION

MANUAL

Serial

Number

__________

Tektronix,

Inc.

S.W.

Millikan

Way

•

P.

O.

Box

500

•

Beaverton,

Ore on

•

Phone

Ml

4-0161

•

Cables:

Tektronix

463

070-382

WARRANTY

All

Tektronix

instruments

are

warranted

against

defective

materials

and

workman



ship

for

one

year.

Tektronix

transformers,

manufactured

in

our

own

plant,

are

war



ranted

for

the

life

of

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

field,

there



fore

all

requests

for

repairs

and

replace



ment

parts

should

be

directed

to

the

Tek



tronix

Field

Office

or

Representative

in

your

area.

This

procedure

will

assure

you

the

fastest

possible

service.

Please

include

the

instrument

Type

and

Serial

number

with

all

requests

for

parts

or

service.

Specifications

and

price

change

priv



ileges

reserved.

Copyright

©

1963

by

Tektronix,

Inc.,

Beaverton,

Oregon.

Printed

in

the

United

States

of

America.

All

rights

reserved.

Contents

of

this

publication

may

not

be

re



produced

in

any

form

without

permission

of

the

copyright

owner.

CONTENTS

Section

1

Characteristics

Section

2

Operating

Instructions

Section

3

Circuit

Description

Section

4

Maintenance

Section

5

Calibration

Procedure

Section

6

Parts

List

and

Schematic

Diagrams

SECTION

1

CHARACTERISTICS

General

The

Tektronix

Type

502A

Oscilloscope

provides

linear

dual beam

displays

with

a

wide

range

of

sweep

rates

com



bined

with

high

input

sensitivity.

In

addition,

the

Type

502A

may

be

used

to

provide

dual beam

X Y

displays

at

medium

sensitivities,

and

single beam

X Y

displays

at

high

sensitivities.

Vertical

amplifiers

for

both

beams

may

be

operated

with

single ended

inputs

for

conventional

operation,

or

with

differential

inputs

for

cancellation

of

common mode

signals.

The

wide

range

of

operational

modes

available

makes

the

Type

502A

adaptable

to

a

great

many

industrial

and

scientific

applications.

VERTICAL-DEFLECTION

SYSTEM

Characteristics

at

each

input

terminal

Direct

connection

—

1

megohm

paralleled

by

47

pf.

With

P6006

Probe

—

10

megohms

paralleled

by

approx.

9

pf.

Deflection

factors

Seventeen

calibrated

deflection

factors

from

0.1

mv/cm

to

20

v/cm

accurate

within

3%.

Continuously

variable

deflection

factors

are

available

from

0.1

mv/cm

to

approximately

50

v/cm.

However,

when

the

variable

is

used

the

frequency

response

in

each

range

of

the

SENSITIVITY

control

will

be

slightly

reduced.

Frequency

response

Frequency

response

characteristics

of

the

Type

502A

vary

with

settings

of

the

SENSITIVITY

controls.

Typical

readings

are

as

follows:

.1

mv/cm

50

kc

.2

mv/cm

100

kc

1

mv/cm

200

kc

50

mv/cm

400

kc

.2

v/cm

1

m

c

Differential

input

rejection

ratio

The

rejection

ratios

specified

below

apply

if

the

signal

voltage

at

the

Input

connector

does

not

exceed

specified

limits.

The

signal

limits

for

d

c

coupling

are,

+

or

—

2

volts

with

respect

to

ground

for

settings

of

the

SENSITIVITY

con



trol

from

0.1

mv/cm

to

.2

v/cm,

+

or

—

20

volts

with

respect

to

ground

for

settings

from

.5

v/cm

to

2

v/cm,

and

+

or

—

200

volts

with

respect

to

ground

for

settings

from

5

v/cm

to

20

v/cm.

For

ac coupling,

the

signal

limits

are

2

volts

peak to peak

from

0.1

mv/cm,

to

.2

v/cm,

20

volts

peak to

peak

from

.5

v/cm

to

2

v/cm,

and

200

volts

peak to peak

from

5

v/cm

to

20

v/cm.

The

DC

common

mode

rejection

ratios

are

measured

with

a

common

sine wave

signal

which

is

applied

to

both

inputs

of

one

vertical

amplifier

simultaneously.

The

sine



wave

signal

has

a

constant

amplitude

of

2

volts

and

a

frequency

as

stated

in

the

table

below.

DC

Common

Mode

Rejection

Ratio

†

A

rejection

ratio

of

40,000:1

can

only

be

obtained

if

the

DC

BAL

control

has

been

properly

adjusted.

Sensitivity

Setting

(Sine wave

output

Ratio

held

at

a

constant

Frequency

amplitude

of

2

volts)

.2

VOLTS

PER

CM

1

kc

1

00:1

.2

mVOLTS

PER

CM

1

kc

20,000:1

†

.1

mVOLTS

PER

CM

1

kc

40,000:1

.2

VOLTS

PER

CM

400

kc

50:1

.2

mVOLTS

PER

CM

100

kc

1000:1

.1

mVOLTS

PER

CM

50

kc

2000:1

HORIZONTAL-DEFLECTION

SYSTEM

Sweep

rates

Twenty one

calibrated

sweep

rates

from

1



sec/cm

to

5

sec/cm.

Accuracy

typically

within

1

%

of

full

scale;

in

all

cases,

within

3%

of

full

scale.

Continuously

variable

sweep

rates

are

available

from

1



sec/cm

to

approximately

2.5

sec/cm.

Ma nifier

Expands

sweep

2,

5,

10,

or

20

times.

Calibration

of

magnified

sweep

rates

accurate

within

3%

for

sweep

rates

which

do

not

exceed

the

maximum

calibrated

rate

of

1



isec/cm.

Unblankin

DC

coupled.

Tri erin

si nal

requirements

Internal

—

a

signal

producing

2

mm

vertical

deflection

on

either

the

UPPER

or

LOWER

BEAM.

External

—

0.2

volts

to

10

volts

on

either

polarity.

Tri erin

si nal

sources

UPPER

BEAM,

LOWER

BEAM,

external,

or

line.

@2

1-1

Characteristics

—

Type

502A

Input

characteristics

at

TRIGGER

INPUT

connector

AC

coupled

—

1

megohm

in

series

with

0.01



f.

DC

coupled

—

1

megohm.

Horizontal

input

With

UPPER

BEAM

amplifier

connected

to

crt

horizontal

deflection

plates:

Deflection

factors

of

0.1

mv/cm

to

20

v/cm

in

17

steps.

With

external

input

connected

to

horizontal

amplifier:

Deflection

factors

of

0.1

v/cm

to

2

v/cm

in

5

steps

which

are

within

±5%.

Input

characteristics

at

EXTERNAL

connector

1

megohm

shunted

by

approximately

70

pf.

OTHER

CHARACTERISTICS

Cathode-ray

tube

Type

T5021P2

—

P

1

,

P7,

and

P11

phosphors

optional.

Each

vertical

beam

covers

a

minimum

of

8

cm

of

vertical

scan.

Volta e

calibrator

Square

wave

output

at

approximately

1

kc.

Six

calibrated

voltage

steps

from

0.5

mv

to

50

volts

peak to peak.

Accuracy

—

within

3%.

Graticule

Edge

lighted

—

marked

in

10

vertical

and

10

horizontal

1

cm

divisions

with

2

mm

markings

on

the

baselines.

Power

requirements

Line

voltage

—

105

to

125

volts,

or

210

to

250

volts,

50 60

cycles.

Power

—

Approximately

300

watts.

Mechanical

characteristics

Ventilation

—

filtered,

forced air.

Construction

—

aluminum alloy

chassis

and

three piece

cabinet.

Dimensions

—

23

½

"

long,

11¼"

wide,

15"

high.

Weight

—

52

pounds.

Accessories

included

2

—

Type

P6006

attenuator

probes,

010 125.

2

—

Binding

post

adapters,

013 004.

1

—

Light

filter.

2

—

Instruction

manuals.

1

—

Test

lead,

012 031.

1

—

3

to

2 wire

adapter,

103 013.

1

—

3 conductor

power

cord,

161 010.

1-2

Shippin

Blocks

It

is

very

important

to

remove

the

shipping

blocks

from

the

vertical

amplifier

prior

to

using

the

oscilloscope.

The

shipping

blocks

are

narrow

inserts,

which

are

used

to

hold

the

vertical

amplifiers

firmly

in

place

during

shipment.

A

small

tug

with

a

pair

of

plier

towards

the

outside

of

the

instrument

will

remove

each

of

the

two

shipping

blocks

used

on

each

vertical

amplifier.

See

figure

2 1

for

the

shipping

block

positions.

The

shipping

blocks

should

be

kept

for

future

use.

Coolin

A

fan

maintains

safe

operating

temperature

in

the

Type

502A

Oscilloscope

by

circulating

air

through

a

filter

and

over

the

components.

Therefore,

the

instrument

must

be

placed

so

that

the

air

intake

is

not

blocked.

The

air

filter

must

be

kept

clean

to

permit

adequate

air

circulation.

If

the

interior

temperature

should

rise

too

high

for

some

reason,

SECTION

2

OPERATING

INSTRUCTIONS

a

thermal

cutout

switch

will

disconnect

the

power

and

keep

it

disconnected

until

the

temperature

drops

to

a

sofe

value.

For

proper

air

circulation,

the

bottom

and

side

panels

must

be

in

ploce.

Be

sure

the

bottom

panel

is

installed

ac



cording

to

directions.

Power

Requirements

The

regulated

power

supplies

in

the

Type

502A

will

operate

with

line

voltages

from

105

to

125

volts,

at

117

nominal

line

volts,

or

from

210

to

250

volts

at

234

nominal

line

volts.

Proportionate

line

voltage

variations

apply

when

other

nominal

line

voltage

primary

connections

are

made.

For

maximum

dependability

and

long

life

the

voltage

should

be

near

the

center

of

this

range.

Fig.

2 2

shows

the

connections

for

the

various

line

voltages.

Voltages

outside

of

these

limits,

or

poor

line voltage

waveforms,

may

cause

hum

or

jitter

on

the

trace

and

may

cause

unstable

operation.

Be

sure

to

check

for

proper

line

voltage

if

indications

such

as

these

are

present.

Fi .

2-1.

The

position

of

the

shippin

blocks

for

each

vertical

amplifier.

2-1

Operatin

Instructions

—

Type

502A

Fi .

2-2.

The

power

transformer

has

two

extra

windin s

permittin

nominal

primary

volta es

of

110,

117,

124,

220,

234

or

248

volts,

50

or

60

cycle

operation.

Fan

Connections

The

manner

in

which

the

fan

is

wired

depends

on

the

line

voltage.

For

110 124

or

220 248

volt

operation,

the

fan

is

connected

as

shown

in

Fig.

2 3.

Fuse

Requirements

Use

a

4

amp.,

3AG,

Fast Bio

fuse

for

110,

117

or

124

volt

60

cycle

operation;

for

50

cycles

use

a

3.2

amp.,

3AG,

S

l

o

B

l

o

fuse.

For

220,

234

or

248

volt,

60

cycle

operation,

use

a

2

amp.,

3AG,

Fast Bio

fuse;

for

50

cycles

use

a

1.6

amp.,

3AG,

S

l

o B

l

o

fuse.

Input

Selection

On

the

Type

502A

oscilloscope,

you

can

connect

single

ended

inputs

to

either

the

A

or

B

input

connectors

of

the

LOWER

or

UPPER

BEAM

amplifiers

by

rotating

the

Input

Selector

switches

to

the

corresponding

position.

The

choice

of

input

connections

will

depend

upon

the

display

desired.

Waveforms

applied

to

input

B

are

displayed

in

an

inverted

position

on

the

face

of

the

crt

while

waveforms

applied

to

input

A

are

displayed

in

the

normal

upright

position.

If

you

are

not

aware

of

this

difference

in

the

input

connectors,

it

is

probable

that

you

will

improperly

evaluate

the

results

obtained

from

an

input

to

the

B

connector.

Fi .

2-3.

Fan

connections

for

the

various

line

volta e

connections.

2-2

Operatin

Instructions

—

Type

502A

Fi .

2-4.

Inputs

to

the

vertical

amplifiers.

Waveforms

applied

to

input

connector

A

are

displayed

in

the

upri ht

position,

while

wave



forms

applied

to

input

connector

B

are

inverted.

Differential

inputs

must

be

connected

to

both

the

A

and

B

input

connectors

of

one

amplifier.

In

the

A

and

B

positions

of

the

input

selector

switch,

the

corresponding

waveforms

are

displayed

on

the

crt.

In

the

A B

(DIFF)

position,

the

B

input

is

algebraically

added

to

the

A

input

and

the

difference

is

displayed.

This

feature

permits

you

to

elim



inate

common

mode

signals

within

specified

limits.

Input

Couplin

Input

signals

to

the

vertical

amplifiers

can

be

either

ac

or

d

c

coupled

by

placing

the

Input

Selector

switch

in

the

corresponding

positions.

DC

coupling

applies

both

the

ac

and

d

c

components

of

the

input

signal

to

the

vertical

amplifier

circuits.

This

permits

you

to

measure

the

d

c

voltage

level

as

well

as

the

amplitude

of

the

ac

component.

It

is

sometimes

neither

necessary

nor

desirable

to

display

the

d

c

component.

In

such

cases

ac

coupling

should

be

used.

With

ac

coupling,

a

capacitor

is

placed

in

series

with

the

input

connector

to

block

the

d

c

component

while

at

the

same

time

allowing

the

ac

component

to

be

displayed.

Fi .

2-5.

Rejection

of

a

common

mode

si nal

by

the

differential

amplifier.

The

waveform

applied

to

input

connector

B

is

al ebra



ically

added

to

the

waveform

applied

to

input

connector

A

and

the

resultant

waveform

is

displayed

on

the

screen

of

the

crt.

Input

Connections

Here

are

some

precautions

you

should

observe

in

connect



ing

your

oscilloscope

to

the

signal

source:

1.

Avoid

errors

in

readings

due

to

stray

electric

or

magne



tic

coupling

between

circuits,

particularly

in

the

leads

connected

to

the

input

connector.

In

general,

unshielded

leads

of

appreciable

length

are

unsuited

for

this

use.

When

shielded

leads

are

used,

the

shields

should

be

grounded

to

the

input

connector

shield

and

to

the

chassis

of

the

equipment

being

tested.

Coaxial

cables

are

recommended

for

many

purposes.

Special

care

must

be

taken

in

the

high

sensitivity

ranges

of

the

oscilloscope

due

to

the

low

signal

level

and

high

amplifier

gain.

2.

As

nearly

as

possible,

simulate

actual

operating

condi



tions

in

the

equipment

being

tested.

The

equipment

should

have

a

load

on

it

which

is

approximately

equal

to

the

load

encountered

in

normal

operation.

3.

Consider

the

effect

of

loading

upon

the

signal

source

due

to

the

input

circuit

of

the

oscilloscope.

The

circuit

at

the

input

connectors

can

be

represented

by

a

resistance

of

1

megohm

shunted

by

a

capacitance

of

47

pf.

With

a

few

feet

of

shielded

cable,

the

capacitance

may

well

be

100

pf

or

more.

In

many

cases,

the

effects

of

these

resistive

and

capacitive

loads

are

not

negligible,

and

to

minimize

them,

you

might

want

to

use

a

probe

in

the

manner

described

in

the

next

section.

Use

of

Probes

An

attenuator

probe

lessens

both

capacitive

and

resistive

loading,

at

the

same

time

reducing

sensitivity.

When

making

amplitude

measurements

with

an

attenuator

probe,

be

sure

to

multiply

the

observed

amplitude

by

the

attenuation

of

the

probe.

A

Type

P6006

Probe

is

furnished

as

an

accessory

to

the

Type

502A

Oscilloscope.

Connected

to

the

Input

connector

of

the

Type

5

0

2A,

the

probe

presents

an

input

characteristic

of

10

megohms

shunted

by

approximately

9

picofarads

and

has

an

attenuation

ratio

of

10:1.

The

maximum

voltage

which

may

be

applied

to

the

probe

is

600

volts.

Exceeding

this

rating,

either

in

peak

ac

volts

or

d

c

volts,

may

result

in

damage

to

the

components

inside

the

probe

body.

If

the

waveform

being

displayed

contains

fast

changing

portions,

it

is

generally

necessary

to

clip

the

ground

lead

of

the

probe

to

the

chassis

of

the

equipment

being

tested.

Select

a

ground

point

which

is

near

the

probe

connection.

Probe

Adjustment

An

adjustable

capacitor,

which

is

built

into

the

probe

body,

is

used

to

compensate

for

slight

variations

in

input

capacitance

from

one

instrument

to

another.

To

insure

the

accuracy

of

pulse

and

transient

measurements,

this

adjust



ment

should

be

checked

frequently.

To

make

this

adjustment,

set

the

AMPLITUDE

CALIBRATOR

and

SENSITIVITY

Controls

on

the

Type

502A

to

display

a

signal

of

suitable

amplitude.

Touch

the

probe

tip

to

the

CAL

OUT

Connector

and

adjust

the

TIME/CM

Control

to

display

several

cycles

of

the

waveform.

Loosen

the

locking

sleeve

several

turns.

(See

figure

2 6.)

Now

while

holding

onto

the

knurled

part

near

the

cable,

turn

2-3

Operatin

Instructions

—

Type

502A

Fi .

2-6.

Location

of

lockin

sleeve

and

knurled

parts

on

the

Type

P6006

Probe.

the

probe

body

until

a

flat

top

is

obtained

on

the

square



wave

waveform.

The

locking

sleeve

should

now

be

tight



ened.

After

the

locking

sleeve

has

been

tightened,

the

probe

compensation

should

be

checked

once

more

to

insure

that

the

compensation

did

not

change

when

the

locking

sleeve

was

tightened.

Tri ered

Operation

In

order

to

obtain

a

stable

display

of

some

recurrent

waveform,

it

will

be

necessary

for

you

to

trigger

the

hori



zontal

sweep

at

the

correct

instant

of

time.

This

will

in



sure

that

the

sweep

will

start

at

the

same

point

on

the

ob



served

waveform

for

each

cycle

of

operation.

The

sweep

should

be

triggered

either

by

some

waveform

bearing

a

fixed

time

relationship

to

the

observed

waveform

or

by

the

observed

waveform

itself.

Either

method

will

produce

the

desired

stable

display.

If

the

waveform

which

is

applied

to

the

UPPER

BEAM

and

the

waveform

which

is

applied

to

the

LOWER

BEAM

have

a

definite

time

relationship

to

each

other

it

is

possible

to

trigger

from

either

beam

and

obtain

simultaneously

a

stable

display

of

both

waveforms.

The

following

instructions

tell

you

how

to

select

the

proper

triggering

signal

for

various

applications

of

your

oscilloscope.

These

instructions

also

provide

information

about

the

advantages

and

limitations

of

each

triggering

con



figuration.

You

should

attempt

to

become

thoroughly

familiar

with

all

of

the

various

triggering

configurations

in

order

that

you

may

obtain

maximum

use

from

your

instrument.

A

thorough

knowledge

of

the

triggering

configurations

will

allow

you

a

greater

selection

of

triggering

methods

when

you

are

confronted

with

a

definite

triggering

problem.

How

to

select

the

tri erin

si nal

source

1.

To

trigger

the

sweep

from

the

waveform

displayed

on

the

UPPER

BEAM,

set

the

TRIGGER

SELECTOR

switch

at

UPPER

AC

or

UPPER

DC.

2.

To

trigger

the

sweep

from

the

waveform

displayed

on

the

LOWER

BEAM,

set

the

TRIGGER

SELECTOR

switch

at

LOWER

AC

or

LOWER

DC.

3.

To

trigger

the

sweep

at

the

power

line

frequency,

set

the

TRIGGER

SELECTOR

switch

at

LINE.

This

mode

of

trig



Fi .

2-7.

The

Type

P6006

Probe

is

adjusted

for

a

flat-topped

square-wave

display

of

the

Calibrator

waveform.

2-4