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DUAL-TRACE

CALIBRATED

PREAMP

TYPE

53/54C

INSTRUCTION

MANUAL

TEKTRONIX,

INC.

MANUFACTURERS

OF

CATHODE-RAY

AND

VIDEO

TEST

INSTRUMENTS

Sunset

Highway

and

Barnes

Road

•

P.

O.

Box

831

•

Portland

7,

Oregon,

U.

S.

A.

Phone:

CYpress

2-2611

•

Cables:

Tektronix

B

http://manoman.sqhill.com

GENERAL

DESCRIPTION

GENERAL

The

Type

53/54C

Dual-Trace

Unit

contains

two

identical

amplifier

channels

that

can

be

elec



tronically

switched

either

by

the

oscilloscope

sweep

or

at

a

free-running

rate

of

approximately

100

kc.

When

amplifier

switching

is

triggered

by

the

oscilloscope

sweep,

the

two

signals

to

be

compared

appear

on

alternate

sweeps.

Because

the

sweeps

are

identical,

and

time-delay

charac



teristics

of

the

two

amplifier

channels

are

closely

controlled,

time

comparisons

accurate

within

1

mµsec

can

be

made.

Stationary

display

of

two

signals

unrelated

in

frequency

can

be

accomplished

by

internal

trig



gering

of

the

sweep

alternately

by

the

two

sig



nals.

In

free-running

operation,

switching

oc



curs

at

a

rate

of

approximately

100

kc,

making

it

possible

to

view

two

simultaneous

transients.

Transients

of

as

little

as

one-millisecond

duration

can

be

well

delineated,

with

about

one

hundred

elements

in

each

trace.

For

many

purposes,

shorter

transients

can

be

adequately

observed.

Either

amplifier

channel

can

be

used

separately

without

electronic

switching,

making

the

Type

53/54C

also

useful

in

all

single-trace

applications

within

its

frequency-response

and

sensitivity

capabilities.

Maximum

flexibility

is

obtained

by

providing

separate

positioning,

sensitivity,

and

polarity-inverting

controls

for

each

channel.

TYPE

53/S4C

SPECIFICATIONS

Operating

Modes

The

two

amplifier

channels

can

be

displayed

alternately

at

a

rate

of

approximately

100

kc,

alternately

every

other

sweep,

or

either

channel

can

be

used

separately.

Amplifier

Sensitivity

Basic

deflection

factor

—

.05

v/cm,

ac

or

d

c

.

Nine

calibrated

sensitivities

—

.05

v/cm

to

20

v/cm,

accurate

within

3%

when

set

on

any

one

step.

Amplifier

Transient

Response

With

541

or

545,

rise

time

.015

µsec.

With

531

or

535,

rise

time

.032

µsec.

With

532,

rise

time

.070

µsec.

Amplifier

Frequency

Response

With

541

or

545,

3

db

down

at

approximately

24

me.

With

531

or

535,

3

db

down

at

approximately

11

me.

With

532,

3

db

down

at

approximately

5

me.

Input

Impedance

1

megohm

shunted

by

20

µµi;

with

P410

probe

10

megohms,

7.5

µµf

Physical

Characteristics

Construction

—

Aluminum

alloy

chassis.

Fin



ish

—

Photo-etched

anodized

panel.

Weight

—

4½

lbs.

FUNCTIONS

OF

CONTROLS

AND

CONNECTORS

CHANNEL

A

CHANNEL

B

Signal

input

to

the

A-channel

or

B-channel

amplifier.

DC

—

AC

Slide

switch

to

provide

either

ac

or

de

coupled

input

into

the

amplifiers.

VOLTS/CM

Nine-position

switch

used

to

select

the

calibrated

vertical-deflection

sensitivities.

VARIABLE

Potentiometer

concentric

with

the

VOLTS/CM

switch

to

provide

continuously

variable

attenuation

between

the

calibrated

sensitivities

and

to

extend

the

attenu



ation

to

a

sensitivity

of

50

v/cm.

POLARITY

Two-position

switch

to

provide

optional

in-phase

or

out-of-phase

output.

VERTICAL

POSITION

Potentiometer

to

provide

for

shifting

the

position

of

the

trace

vertically.

GAIN

ADJ.

Screwdriver

adjustable

potentiometer

to

permit

the

gain

of

the

amplifier

to

be

accurately

set.

DC

BAL.

Screwdriver

adjustable

potentiometer

to

provide

for

setting

the

VARIABLE

attenuator

d

c

levels

so

the

trace

does

not

shift

position

when

the

attenuation

is

varied.

MODE

Four-position

switch

to

allow

either

amplifier

to

be

used

independently,

to

provide

for

switching

the

two

amplifiers

at

an

arbitrary

rate,

or

to

synchronize

the

switch



ing

with

the

oscilloscope

’

s

sweep.

53/54C

—

GENERAL,

DESCRIPTION

—

PAGE

1

OPERATING

INSTRUCTIONS

FIRST-TIME

OPERATION

Plug

the

unit

into

a

540-

or

530-Series

Oscil



loscope

and

turn

the

power

on.

Allow

the

instru



ment

to

reach

operating

temperature,

about

2

to

3

minutes

and

free-run

the

sweep

at

1

millisec-

ond/cm.

Turn

the

MODE

switch

to

A

ONLY

and

the

A-channel

POLARITY

and

AC-DC

switches

to

NORMAL

and

DC

respectively.

Position

the

trace

to

about

+2

cm

with

the

A-

channel

VERTICAL

POSITION

control.

Turn

the

MODE

switch

to

B

ONLY

and

the

B-channel

POLARITY

and

AC-DC

switches

to

NORMAL

and

DC

respectively.

Position

the

trace

to

about

—

2

cm

with

the

B-channel

VERTICAL

POSITION

control.

Now

turn

the

MODE

switch

to

CHOPPED.

Two

traces

will

appear

on

the

crt

screen.

Notice

that

the

A-channel

VERTICAL

POSITION

control

moves

the

upper

trace

and

the

B-channel

VERTICAL

POSITION

control

moves

the

lower

trace.

Increase

the

sweep

speed

to

100

microsecond/cm

and

notice

that

each

trace

is

composed

of

many

short-duration

elements.

The

two

channels

are

being

switched

at

approxi



mately

100

kc

so

that

each

channel

conducts

for

about

5

µsec

and

then

is

cut

off

while

the

other

channel

conducts

for

an

equal

time.

Now

turn

the

MODE

switch

to

the

ALTER



NATE

position.

There

are

still

two

traces

on

the

crt

screen

but

the

traces

are

no

longer

chop



ped

into

small

bits.

For

each

sweep

cycle

one

channel

is

conducting

and

the

other

is

cut

off.

The

channels

are

switched

at

the

end

of

each

sweep

cycle.

GENERAL

OPERATION

Either

of

the

two

identical

amplified

channels

can

be

used

independently

by

turning

the

MODE

Switch

to

A

ONLY

or

B

ONLY

and

connecting

the

signal

to

be

observed

to

the

ap



propriate

input.

The

following

remarks

apply

equally

well

to

either

amplifier

channel.

Use

of

Probe

The

Type

P410

probe,

furnished

with

the

540-

Series

Oscilloscopes,

is

designed

to

preserve

the

transient

response

of

this

unit.

This

probe

in



troduces

no

ringing

but

causes

an

additional

fre



quency-response

loss

of

less

than

1

db

at

24

me.

The

Type

P410

probe

has

a

10-to-l

attenuation

ratio.

The

Type

P510A

probe

is

not

suitable

for

use

with

the

Type

53/54C

Plug-In

Unit

and

540-

Series

Oscilloscope

combination

to

observe

fast



rising

pulses.

This

probe

tends

to

ring

at

about

50

me

and

the

wide

passband

of

the

53/54C

—

540-Series

combination

will

display

any

ringing

that

may

occur.

Be

sure

to

check

the

adjustment

of

the

probe

when

you

first

connect

it

to

a

plug-in

unit

or

oscilloscope.

The

probe

compensation

is

a

func



tion

of

the

shunt

input

capacitance

of

the

par



ticular

plug-in

unit

or

oscilloscope

that

you

use

the

probe

with.

If

the

compensation

is

incorrect

the

frequency

response

will

be

affected.

Touch

the

probe

tip

to

the

calibrator

output

connector

and

display

several

cycles

of

the

calibrator

wave



form.

If

the

top

and

bottom

of

the

displayed

square

wave

are

not

flat,

adjust

the

trimmer

ca



pacitor

located

either

inside

the

probe

body

or

inside

the

box

at

the

other

end

of

the

cable

to

achieve

correct

square-wave

response.

Input

Coupling

It

is

sometimes

undesirable

to

display

the

de

level

of

the

waveform

being

observed.

Placing

the

AC-DC

switch

in

the

AC

position

inserts

a

capacitor

in

series

with

the

input

so

the

de

com



ponent

of

the

waveform

is

blocked

and

only

the

ac

component

is

displayed.

The

low-frequency

response

is

about

2

cps

when

ac

coupling

is

used.

Output

Polarity

It

will

be

desirable

to

invert

the

displayed

waveform

at

times,

particularly

when

using

the

dual-trace

feature

of

the

53/54C.

The

POLAR



ITY

switch

has

two

positions.

In

the

NORMAL

position

the

displayed

waveform

will

have

the

same

polarity

as

the

input

signal.

In

the

IN



VERTED

position

the

displayed

waveform

will

be

turned

upside

down;

that

is,

a

positive-going

pulse

will

be

displayed

as

a

negative-going

pulse.

DC

Balance

Adjustment

After

the

plug-in

unit

has

been

in

use

for

a

period

of

time

you

will

notice

that

the

trace

will

change

position

as

the

VARIABLE

control

is

rotated.

This

is

caused

by

tube

ageing

and

the

resultant

shift

in

operating

potentials.

To

cor



rect

this

condition

rotate

the

VARIABLE

con



trol

back

and

forth

and

adjust

the

DC

BAL

con



trol

until

the

trace

position

is

no

longer

affected

by

rotation

of

the

VARIABLE

control.

Gain

Adjustment

Ageing

of

the

tubes

will

also

affect

the

gain

of

the

plug-in

unit.

Display

a

calibrator

wave



form

of

0.2

volt

peak

to

peak

with

the

VOLTS/CM

switch

in

the

.05

position.

Adjust

the

GAIN

ADJ

control

until

the

displayed

waveform

is

4

graticule

divisions

in

amplitude.

Make

sure

the

VARIABLE

control

is

turned

full

right

to

the

CALIBRATED

position

before

making

this

adjustment.

53/54C

—

OPERATING

INSTRUCTIONS

—

PAGE

1

Positioning

Adjustment

The

VERT

POS

RANGE

control

balances

the

de

output

level

so

the

full

range

of

the

front



panel

positioning

controls

can

be

utilized.

This

control

is

accessible

when

the

left

side

panel

is

removed.

Center

the

trace

in

both

the

A

ONLY

and

B

ONLY

positions

of

the

MODE

switch.

Note

the

settings

of

the

VERTICAL

POSI



TION

controls.

Adjust

the

VERT

POS

RANGE

control

so

both

the

A-channel

and

B-channel

VERTICAL

POSITION

controls

are

approxi



mately

centered

when

the

displayed

trace

is

cen



tered.

DUAL-TRACE

OPERATION

Generally,

two

types

of

operation

will

be

per



formed

using

the

dual-trace

function

of

the

53/54C;

the

observation

of

repetitive

waveforms

and

the

observation

of

single

transients.

The

two

types

of

operation

are

fundamentally

differ



ent

so

we

will

examine

them

in

the

order

stated.

Repetitive

Signals

Connect

the

two

signals

to

be

compared

to

the

two

signal

inputs

and

turn

the

MODE

switch

to

A

ONLY.

Set

the

sweep

up

for

trig



gered

operation

and

adjust

the

VOLTS/CM

and

VERTICAL

POSITION

controls

as

neces



sary

to

display

the

waveform.

Turn

the

MODE

switch

to

B

ONLY

and

adjust

the

correspond



ing

controls

as

necessary

to

display

the

other

waveform.

Now

turn

the

MODE

switch

to

ALTERNATE.

If

necessary,

touch

up

the

oscil



loscope

’

s

sweep

triggering

controls

to

obtain

a

stable

image.

Both

waveforms

will

now

be

dis



played

on

the

ert

screen.

As

the

control

of

each

amplifier

is

independent

you

can

position,

atten



uate,

or

invert

the

signals

as

necessary

to

com



pare

their

shape,

relative

amplitudes,

etc.

Use

the

AC

FAST

triggering

mode

and

AL



TERNATE

sweeps

for

INTernal

triggering

on

signals

having

components

above

10

kc.

For

low



er-frequency

signals,

use

the

AC

SLOW

trigger



ing

mode.

In

the

AC

FAST

position,

an

rc

filter

is

inserted

into

the

circuit

allowing

it

to

recover

quickly

from

the

de

level

changes

encountered

with

the

ALTERNATE

sweep.

To

compare

the

phase

difference

between

two

signals,

you

should

trigger

externally

using

the

reference

signal

as

the

trigger

signal.

Single

Transients

When

it

is

necessary

to

observe

a

single

tran-

ient

at

two

parts

of

a

circuit

another

procedure

must

be

followed.

In

the

foregoing

case,

one

of

the

signals

triggers

the

sweep

and

that

amplifier

remains

conducting

for

the

sweep

duration.

At

the

end

of

the

sweep

the

amplifiers

are

switched

and

the

other

signal

then

triggers

the

sweep

and

that

amplifier

remains

conducting

for

the

sweep

duration.

Each

of

the

signals

is

being

displayed

every

other

sweep

cycle.

If

you

at



tempted

to

observe

a

single

transient

in

this

manner

the

transient

will

pass

through

which



ever

amplifier

happens

to

be

conducting

and

will

trigger

the

sweep.

This

will

display

the

trans



ient

as

seen

by

whichever

amplifier

is

conduct



ing

but

when

the

amplifiers

are

switched

at

the

end

of

that

sweep

there

will

be

no

further

signal

to

trigger

another

sweep

until

the

next

transient

occurs.

The

problem

here

is

to

be

able

to

ob



serve

the

transient

using

both

amplifiers

during

a

single

sweep

cycle.

Turn

the

MODE

switch

to

CHOPPED.

Now

the

two

amplifiers

are

being

switched

on

and

off

independently

of

any

signal.

The

switching

rate

is

approximately

100

kc

so

each

amplifier

is

conducting

for

about

5

µsec

and

then

is

cut

off

while

the

other

amplifier

conducts

for

an

equal

length

of

time.

In

this

case

the

sweep

is

being

triggered

by

the

switching

waveform,

particu



larly

if

the

two

traces

are

positioned

very

far

apart,

as

the

switching

waveform

is

equivalent

to

a

100-kc

square

wave.

It

will

usually

be

very

difficult

if

not

impossible

to

trigger

the

sweep

internally

from

the

signal

so

the

sweep

controls

should

be

set

for

external

triggering.

Review

the

OPERATING

INSTRUCTIONS

section

of

the

oscilloscope

’

s

instruction

manual

for

the

proper

procedure

for

external

triggering

of

the

sweep.

Now

the

two

signals

to

be

observed

can

be

connected

to

the

two

inputs

and

both

wave



forms

will

be

displayed

during

one

sweep

cycle.

Transients

as

short

as

1

msec

duration

can

be

well

delineated,

with

about

100

elements

in

each

trace.

As

before,

the

independent

control

of

each

amplifier

will

allow

you

to

position,

attenu



ate,

or

invert

the

waveforms

so

they

can

be

easily

compared.

53/54C

—

OPERATING

INSTRUCTIONS

—

PAGE

2

CIRCUIT

DESCRIPTION

AMPLIFIERS

The

Type

53/54C

Plug-In

Unit

consists

of

two

identical

amplifier

channels

and

a

channel



switching

multivibrator.

The

following

descrip



tion

of

the

amplifiers

applies

equally

well

to

either

channel.

Input

Coupling

and

Attenuation

The

signal

to

be

displayed

is

applied

to

the

input

cathode

follower

V3

0

53

(V4053)

by

way

of

the

AC-DC

switch

and

the

VOLTS/CM

switch.

The

AC-DC

switch

is

a

two-position

slide

switch

that

shorts

out

C3003

(C4003)

in

the

DC

position

so

the

input

is

d

c

coupled.

In

the

AC

position

of

this

switch

the

signal

must

pass

thru

C3003

(C4003)

so

the

d

c

component

of

the

signal

is

blocked.

The

VOLTS/CM

switch

is

a

9-position

rotary

switch

that

selects

the

various

frequency-com



pensated

rc

attenuator

sections.

The

basic

sen



sitivity

of

the

unit

is

.05

volts/cm.

This

sensi



tivity

is

reduced

by

the

eight

individually

se



lected

attenuator

sections

to

give

nine

fixed

cali



brated

sensitivities.

Input

Stage

The

input

stage

consists

of

the

cathode

fol



lower

V3053

(V4053)

and

the

cathode-coupled

phase

inverters

V3083

and

V3263

(V4083

and

V4263).

The

control-grid

d

c

level

of

V3083

(V4083)

is

established

by

the

d

c

connection

to

the

cathode

of

V3053

(V4053).

The

control



grid

dc

level

of

V3263

(V4263)

is

adjustable

by

means

of

the

DC

BAL

control

so

that

the

d

c

level

of

the

cathodes

of

V3083

and

V3263

(V4083

and

V4263)

can

be

made

equal.

Any

d

c

level

difference

between

these

two

cathodes

would

act

as

a

signal

and

cause

the

trace

to

shift

posi



tion

when

the

VARIABLE

control

is

rotated.

The

VARIABLE

gain

control

establishes

the

amount

of

cathode

coupling

and

thus

allows

the

stage

gain

to

be

varied

over

about

a

2½

to

1

range.

The

GAIN

ADJ

control

permits

the

basic

gain

of

the

unit

to

be

accurately

set

to

agree

with

the

front-panel

calibration.

Polarity

and

Positioning

With

the

POLARITY

switch

in

the

NOR



MAL

position

the

displayed

waveform

will

have

the

same

polarity

as

the

input

signal.

Placing

the

POLARITY

switch

in

the

INVERTED

position

reverses

the

signal-grid

connection

of

V3303

and

V3343

(V4303

and

V4343)

and

turns

the

displayed

waveform

upside

down.

Rotation

of

the

VERTICAL

POSITION

control

forces

one

plate

of

the

input

stage

toward

a

higher

potential

and

the

opposite

plate

toward

a

lower

potential.

The

resulting

dc

level

shift

moves

the

trace

vertically.

Amplifier

Stage

and

Output

CF

The

signal

is

further

amplified

by

V3303

and

V3343

or

V4303

and

V4343,

depending

on

which

channel

is

conducting.

V3303

and

V4303

have

a

common

plate

load

and

likewise

V3343

and

V4343.

Since

one

amplifier

is

always

cut

off

while

the

other

is

conducting,

the

shunt

loading

effect

is

negligible.

V3503

is

the

output

cathode

follower

that

pro



vides

a

low-impedance

source

for

driving

the

oscilloscope

’

s

vertical

amplifier.

The

POSI



TIONING

ADJ

control

located

in

the

grid

circuit

of

the

output

cf

permits

the

trace

to

be

centered

vertically

under

no-signal

conditions.

SWITCHING

CIRCUIT

A

Only,

B

Only

V37

0

3

is

a

multivibrator

that

is

controlled

by

the

MODE

switch.

With

the

MODE

switch

in

the

A

ONLY

or

B

ONLY

position

the

multi



vibrator

is

held

in

one

of

its

two

possible

states

by

returning

one

grid

to

a

positive

voltage

and

the

other

grid

to

a

negative

voltage.

For

ex



ample,

in

the

A

ONLY

position

the

grid

of

V3703A

is

held

positive

and

this

half

of

the

multivibrator

conducts

while

the

grid

of

V3703B

is

held

negative

and

this

half

is

cut

off.

While

V3703A

is

conducting

the

cathode

is

above

ground

which

causes

V3903A

to

conduct

and

in

turn

pulls

the

grid

of

V3953B

toward

ground

lowering

the

plate

voltage

of

V4083

and

V4263.

This

reduced

plate

voltage

cuts

off

the

following

stage

(V4303

and

V4343)

and

the

B-channel

amplifier

is

held

in

a

non-conducting

state.

The

converse

is

true

of

the

A-channel

amplifier.

The

grid

of

V3903B

is

near

ground

potential

and

with

reduced

plate

current

the

plate

of

V3903B

and

consequently

the

grid

of

V3953A

are

per



mitted

to

become

more

positive

providing

plate

voltage

for

V3083

and

V3263

and

the

A-channel

amplifier

then

conducts.

Chopped

Turning

the

MODE

switch

to

the

CHOP



PED

position

returns

both

grids

of

the

multivi



brator

to

a

positive

voltage

and

the

multivibra



tor

free

runs

at

a

rate

determined

by

the

time

constant

of

the

grid

circuits.

The

two

ampli



fiers

are

alternately

cut

off

and

allowed

to

con



duct

at

the

free-running

rate

of

the

multivi



brator.

TYPE

5

3/54C

—

CIRCUIT

DESCRIPTION

—

PAGE

1

Alternate

Turning

the

MODE

switch

to

the

ALTER



NATE

position

returns

both

grids

of

the

multi



vibrator

to

a

negative

potential

and

it

is

then

bistable.

At

the

end

of

each

sweep

cycle

a

nega



tive-going

trigger

is

generated

and

is

coupled

to

the

multivibrator

through

the

Trigger

Coup



ling

Diode

V3803.

Each

trigger

causes

the

multi



vibrator

to

“

flip

”

from

one

stable

state

to

the

other.

This

alternately

switches

the

amplifiers

on

and

off

but

now

the

switching

rate

is

deter



mined

by

the

sweep

repetition

rate.

TYPE

53/54C

—

CIRCUIT

DESCRIPTION

—

PAGE

2

MAINTENANCE

PARTS

ORDERING

AND

REPLACEMENT

Instruction

Manual

A

Tektronix

instruction

manual

usually

con*

tains

hand-made

changes

to

diagrams

and

parts

lists,

and

sometimes

text.

These

changes

are

in

general

appropriate

only

to

the

instrument

the

manual

was

prepared

for.

These

hand-made

corrections

show

changes

to

the

instrument

that

have

been

made

after

the

printing

of

the

manual.

There

is

a

serial

number

on

the

frontispiece

and

on

the

warranty

page

of

this

manual.

This

is

the

serial

number

of

your

instrument.

Be

sure

the

manual

number

matches

the

instrument

number

when

you

order

parts.

NOTE

Always

include

the

instrument

type

AND

SERIAL

NUMBER

in

any

cor



respondence

regarding

the

instrument.

Standard

Components

Tektronix

will

supply

replacement

compo



nents

at

current

net

prices.

However,

since

most

of

the

components

are

standard

electronic

and

radio

parts

you

can

probably

obtain

them

locally

faster

than

we

can

ship

them

to

you

from

the

factory

in

Portland,

Oregon.

Be

sure

to

consult

the

instruction

manual

to

see

what

tolerances

are

required.

Selected

Components

We

specially

select

some

of

the

components,

whose

values

must

fall

within

prescribed

limits,

by

sorting

through

our

regular

stocks.

The

components

so

selected

will

have

standard

RETMA

color

coding

showing

the

value

and

tolerance

of

the

stock

they

were

selected

from,

but

they

will

not

in

general

be

replaceable

from

dealer

’

s

stocks.

Checked

Tubes

To

obtain

maximum

reliability

and

perform



ance

we

check

some

of

the

vacuum

tubes

in

our

instruments

for

such

characteristics

as

micro



phonics,

balance,

transconductance,

etc.

We

age

other

tubes

to

stabilize

their

characteristics.

Since

there

are

no

well

defined

standards

of

tube

performance

we

have

established

our

own

arbitrary

standards

and

have

developed

equip



ment

to

do

this

checking.

These

checked

tubes

can

be

purchased

through

our

local

Field

Engi



neering

Offices

or

directly

from

the

factory

in

Portland,

Oregon.

Tektronix

Manufactured

Parts

Tektronix

manufactures

almost

all

of

the

me



chanical

parts

and

some

of

the

components

used

in

the

instrument.

If

you

‘

order

a

mechanical

part

be

sure

to

describe

the

part

completely

to

prevent

any

unnecessary

delay

in

filling

your

order.

When

you

have

any

questions

about

me



chanical

parts

or

Tektronix

manufactured

com



ponents

contact

our

nearest

Field

Engineering

Office

or

write

to

the

Field

Engineering

De



partment

at

the

factory

in

Portland,

Oregon.

GENERAL

INFORMATION

Color

Coding

We

use

color

coded

wires

in

the

instruments

to

help

identify

the

various

circuits.

These

wires

will

be

either

a

solid

color

or

will

be

a

solid

color

(including

black

and

white)

with

one

or

more

colored

stripes.

The

colored

stripes

are

“

read

”

in

the

same

manner

as

the

RETM

A

resistor

color

code.

In

the

case

of

multiple

stripes

the

wide

stripe

is

read

first.

Wires

carrying

positive

regulated-power-sup



ply

voltages

are

white

and

the

stripes

indicate

the

supply

voltage.

For

example,

the

+225-V

supply

bus

will

be

coded

red-red-brown

(2-2-1)

giving

two

significant

figures

and

the

decimal

multiplier.

The

negative-supply

bus

wires

are

black

and

the

stripes

indicate

the

supply

voltage.

For

ex



ample,

our

most

common

negative-supply

volt-

tage

is

—

150v

and

is

carried

by

a

black

wire

coded

brown-green-brown

(1-5-1).

The

mains-voltage

leads

to

the

power

trans



former

are

yellow

and

coded

brown-brown-

brown

(1-1-1).

The

tube

heater

leads

are

white

and

coded

6-1,

6-2,

6-3,

etc.,

not

to

indicate

that

the

voltages

are

different

but

to

differentiate

between

cir



cuits.

In

other

respects

the

color

coding

will

vary

from

instrument

to

instrument.

In

general

all

signal-carrying

leads

are

white

and

coded

with

a

single

colored

stripe.

In

a

few

places

where

the

number

of

leads

exceeded

the

capabilities

of

single-stripe

coding

we

have

used

solid-color

leads.

Soldering

Precaution

The

solder

used

on

the

ceramic

terminals

of

this

instrument

must

contain

a

small

percentage

of

silver.

Repeated

use

of

ordinary

tin-lead

solder

will

dissolve

the

fused

bond

of

silver

that

makes

the

solder

adhere

to

the

porcelain,

especially

if

the

soldering

iron

is

quite

hot.

A

quantity

of

the

silver-bearing

solder

that

we

use

at

the

factory

is

attached

to

each

major

instrument

having

ceramic

strips.

This

solder,

containing

approximately

3%

silver,

is

not

readi



ly

available

through

regular

channels.

If

you

need

additional

silver-bearing

solder

for

main



tenance

purposes

you

can

purchase

it

from

Tek



tronix

in

one-pound

spools.

51/54C

—

MAINTENANCE

—

PAGE

1

ADJUSTMENT

PROCEDURE

The

following

outline

is

based

on

the

adjust



ment

procedure

used

in

our

test

department

here

at

the

factory.

Ordinarily,

adjustment

in

the

field

will

consist

of

touching

up

some

of

the

dc

level

and

balance

controls

as

outlined

in

the

OPERATING

INSTRUCTIONS,

but

if

a

re



adjustment

of

the

transient

response

is

ever

necessary

there

is

a

certain

sequence

that

should

be

followed.

The

input

capacitance

of

the

unit

is

accurately

set

to

20

µµf

at

the

factory.

This

insures

that

a

properly

adjusted

probe

can

be

used

interchange



ably

with

other

units

having

20-µµf

input

capaci



tance.

To

preserve

this

feature,

you

will

need

to

do

one

of

these

things:

(1)

use

a

CS-20

Input-

Capacitançe

Standardizer,

(2)

calibrate

a

P400-

Series

probe

against

a

plug-in

unit

known

to

be

in

correct

adjustment,

or

(3)

measure

the

input

capacitance

with

a

Type

130

L,C

meter

or

with

a

capacitance

bridge.

Peaking

Coils

As

a

preliminary

adjustment,

set

all

peaking-

coil

slugs

so

that

the

top

of

each

slug

is

flush

with

the

bottom

turn

of

the

winding.

(As

an

emergen



cy

measure,

these

settings

alone

are

adequate

for

approximately

correct

results.)

For

complete

calibration

of

the

peaking

coils,

plug

the

Type

53/54C

unit

into

a

540-Series

oscil



loscope

known

to

be

in

correct

adjustment.

Have

the

cabinet

or

side

panels

removed.

If

the

oscillo



scope

is

not

of

recent

manufacture,

you

will

have

to

drill

the

side

panel

of

the

plug-in-preamplifier

compartment

within

the

oscilloscope,

to

provide

access

to

the

adjustments

of

the

Type

53/54C

unit.

A

source

of

square

waves

or

pulses

having

a

rise

time

not

longer

than

3

millimicroseconds

is

needed.

The

repetition

rate

should

preferably

be

1

kc

or

more.

It

is

essential

that

this

source

be

terminated

in

accordance

with

the

manufacturer

’

s

specifications.

Turn

the

MODE

switch

to

A

ONLY,

the

VOLTS/CM

switch

to

0.05,

and

the

VARI



ABLE

control

full

right

to

the

CALIBRATED

position.

The

peaking

coils

affect

the

rise

and

leading

corner

of

the

square

wave

and

should

be

ad



justed

for

a

square

comer

with

no

overshoot.

1.

Adjust

L3523

and

L4413.

2.

Adjust

L3313

and

L3353.

3.

Adjust

L3073

and

L3253.

Move

the

square-wave

source

to

the

CHAN



NEL

B

input

connector

and

set

the

B-channel

controls

as

you

previously

set

the

A-channel

controls.

1.

Adjust

L4313

and

L4353.

2.

Adjust

L4073

and

L4253.

If

after

adjustment

one

channel

seems

to

have

a

better

response

than

the

other

try

a

slightly

different

setting

of

L3523

and

L4413,

which

are

common

to

both

channels,

and

then

repeat

steps

2

and

3

of

the

A-channel

adjustment

and

steps

1

and

2

of

the

B-channel

adjustment.

You

will

have

to

experiment

with

the

settings

of

L3523

and

L4413

to

find

which

setting

will

give

the

best

balance

of

response.

Input

Attenuators

There

are

two

types

of

adjustments

to

be

made.

Each

adjustment

requires

a

Type

105,

or

other

square-wave

source

having

a

rise

time

not

longer

than

0.025

µsec.

The

source

must

be

terminated

according

to

the

manufacturer

’

s

specifications.

One

type

of

adjustment

is

made

to

compensate

the

attenuators

so

the

ac

attenuation

is

equal

to

the

dc

attenuation.

This

involves

a

moderately

short

time

constant.

Misadjustment

can

be

rec



ognized

as

a

slight

rounding

or

overshoot

at

the

leading

corner

of

the

square

wave.

The

other

type

of

adjustment

is

made

to

get

equal

input

capacitances

at

all

positions

of

the

at



tenuator.

Misadjustment

can

be

recognized

as

a

downward

or

upward

slope

over

about

the

first

one-quarter

of

the

square

wave.

First

compensate

the

A-channel

attenuators.

Connect

the

probe

to

the

CHANNEL

A

input

connector

and

connect

the

square-wave

source

to

the

probe.

Display

four

or

five

cycles

of

a

1-kc

square

wave.

Set

the

VOLTS/CM

switch

to

.05

and

adjust

C3023

for

a

flat

top

on

the

square

wave.

Remove

the

probe

and

connect

the

square-wave

source

to

the

input

connector.

Adjust

the

listed

capacitors

for

a

square

corner

on

the

square

wave.

VOLTS/CM

Capacitor

.1

C4823C

.2

.5

1

2

5

C4833C

C4843C

C4853C

C4863C

C4873C

10

C4883C

20

C4893C

Connect

the

probe

to

the

CHANNEL

A

input

connector

and

connect

the

square-wave

source

to

the

probe.

Adjust

the

input

capacitance

with

the

VOLTS/CM

switch

in

the

positions

shown.

VOLTS/CM

.1

.2

.5

1

Capacitor

C4823B

C4833B

C4843B

C4853B

5S/54C

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PAGE

2

2

C4863B

5

C4873B

10

C4883B

20

C4893B

Repeat

the

above

operations

with

the

B-chan-

nel

amplifier.

Move

the

square-wave

source

to

the

CHANNEL

B

input

connector

with

the

probe

in

place

and

adjust

C4023

for

a

flat

top

on

the

square

wave.

The

VOLTS/CM

switch

should

be

in

the

.05

position.

Remove

the

probe

and

compensate

the

attenuator.

VOLTS/CM

.1

.2

.5

1

Capacitor

C4923C

C4933C

C4943C

C49S3C

2

C4963C

5

C4973C

10

C4983C

20

C4993C

Insert

the

probe

and

adjust

the

input

capaci



tance.

VOLTS/CM

.1

.2

.5

1

2

5

10

20

Capacitor

C4923B

C4933B

C4943B

C4953B

C4963B

C4973B

C4983B

C4993B

53/54C

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3