Tektronix 536 schematic

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INSTRUCTION

MANUAL

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Tektronix,

070-0270-01

Inc

. •

P.

O. Box

500

• Beaverton, Oregon'

97005

• Phone

644-0161

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• Cables: Tektronix 1270

WARRANTY

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All

Tektronix instruments against ship for

ranty mentioned .above should with your Tektronix Field Engineer.

service fore all requests for repairs ment tronix Field Office or Representative area. fastest possible service. Please include the instrument Type requests

reserved.

right

Oregon. America. this publication any

right owner.

Clefecti¥e materials

one

year.

Any questions with· respect to

Tektronix repair

is

geared

parts

should

This

procedure will assure you·

for.

parts

Specifications

Copyright

1970

form with ut permission

®

by Tektronix, Inc., Beaverton, Printed All

rights reserved.

and

directly to

be

and

Serial number with all

or

service.

and

price

1961,

in

the

may

not

are

warranted

and

workman-

the

war-

be

taken

replacement-part

the

field, there-

and

replace-

directed to

charge

new material copy-

United States of

be

the

Tek-

in

your

privileges

Co

tents of

repro~uced

of

the copy-

the

up

in

I I I I

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Type

536

U.S.A. covered by or

patents

and

foreign Tektronix roducts

U.S

and

forei n

pencUng.

patents

and!

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®®

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section

Section 2

Section 3

Section

Section 6

tion

Section 8

1

4

7"

Specifications

Getting Acquainted

Operating

Circuit Description

Maintenance"

Calibration Procedure

"Mechanical Parts List

Electrical Parts List

Instructions

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Type

536

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Type

536

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SECTION

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General

The

Type

536

Cathode-Ray Oscilloscope

signed

for

making phase measurements and

in

ing, almost identical vertical and horizontal amplifiers, and a new type cathode-ray tube. Additional versatility, provided the general laboratory applications. the triggered, accurately calibrated horizontal or vertical base.

Vertical-Deflection

Vertical·deflection factor

Transient response

Linear

Plug-in

Horizontal-Deflection

Horizontal-deflection factor

T

Linear

a range

by

Type Type T Time-Base

Deflection factor,

main

Risetime

unit,

0.032

deflection

10

divisions

preamplifier

See applicable instruction manual or the descriptive sheets

on

pi

Deflection factor,

unit

alone,

ra

nsient response

Risetime

main

deflection

10

divisions

from

de

to

18

me.

separately available Tektronix plug-in

536

Oscilloscope

using

unit

alone,

0.1

of

vertical-deflection amplifier

}JoSec.

(31ja

inches).

unit

ug-in

units

at

using

0.1

volt/div.

of

horizontal-deflection amplifier

unit,

0.032

p.sec.

(3%

inches).

useful

for

For

Generator plug-in

System

deflection system

volt/div.

the end

deflection system

of

System

this

is

especially de-

for

This

feature

a wide variety

example, the

unit

of

In

Type

section.

of

Type

In

curve trac-

is

due

units,

make

use

provides a

time

Type

536

main

536

main

Type

536

SPECIFICATIONS

to to

of

Plug-in

Other Characteristics

Cathode-ray tube

Voltage calibrator

Amplifier-phasing control

Horizontal and Vertical Signal Output Connectors

Power requirements

Ventilation

Finish

Dimensions

preamplifier

See applicable instruction manual or the descriptive sheets

on plug-in

T56P31

Type

(Pl,

P2,

P7 Accelerating potential: 4,000 volts. Deflection factors,

plates: Vertical-l0

Horizontal-l0

Eighteen fixed peak-to-peak voltages

to

100

volts. . Accuracy-3 Waveform-Square

Adjusts the relative deflection-system phase to compensate

for minor variations between plug-in

Cathode follower outputs and the nominal amplitude

1 volt/div

volt/div.

108,

115,

122,216,230,

Hz)

50-60

Filtered, forced-air.

Photo-etched, anodized panel.

24" long,

13"

unit.

units

at

the end of

and Pll phosphors optional).

with

volts/divisions, nominal.

percent.

wave

of

crt deflection;

625

watts.

wide, 16%" high.

this

direct connection

at

about 1

minimum

or 244v

Blue-wrinkle

section.

kc.

(-+-9%

to

from

0.2

units

and cables.

amplitude

on

each range

cabinet.

deflection

millivolt

is

0.75

is

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1-1

Specifications - Type

536

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PLUG-IN

TYPE

Wide-Band

DC

Coupled

TYPE

Wide-Band

High-Gain

TYPE

Dual-Trace

DC

Coupled

TYPE

High-Gain

AC

Coupled

Differential

TYPE

Low-Level

AC

Coupled

Differential

TYPE

Wide-Band

DC

Coupled

Differential

TYPE

A

B

CA

D

E

G

PLUG-IN

DEFLECTION

0.05

5 my/em

0.05

1 my/em

50

PREAMPLIFIER

CALIBRATED

v/em

to

v/em

fLv/em

0.05

v/em

CHARACTERISTICS

FACTOR

to

20

v/em

0.05

v/em 2 e to 9

to

20

v/em

to

20

v/em

to

50

v/emt

to

10

my/em

to

20

v/em

PASSBAND

de

de to lOme

de

0.06

cycles to

de

to

10

to

10

to 2 me

to

10

FOR

me

60

TYPE

ke

536

OSCILLOSCOPE

RISETIME

35

nsee

40

nsee

35

nsee

35

nsee

0.18

fLsee

6

fLsee

35

nsee

INPUT

CAPACITANCE

47

pf

47

pf

20

pf

47

pf

50

pf

47

pf

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TYPE

H

DC

Coupled

High-Gain

Wide-Band

TYPE

K

Fast-Rise

DC

Coupled

TYPE

L

Fast-Rise

High-Gain

TYPE

N*

Pulse

Sampling

TYPE

Q*

Strain

Gage

TYPE

T*

is a Time-Base

TYPE

Z*

Differential

Comparator

*More data available on the special purpose plug-in

tAt

sensitivities greater than

0.005

v/em

to

20

0.05

v/em

to

20

5 my/em to 2 v/em

0.05

v/em

to

20

10mv/em

10

fLstrain/div to

10,000

fLstrain/div

Generator

0.05v/em to 25v/em

.05

v/em,

maximum

v/em

3

units

in

bandpass

de

to

9.5

me

de

to

11

me

to

10

me

de

to

11

me

600

me

de

to 6

ke

de

to 9

me

the following paragraphs.

is

less

than 2

me.

At

37

nsee

32

nsee

35

nsee

32

nsee

0.6

nsee

60

fLsee

40

nsee

1 my/em,

Input Impedance,

it

is

approximately

47

pf

20

pf

20

pf

50

ohms

Adjustable

27

pf

350

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1-2

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Specifications - Type

536

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Type

N

The

Type N Sampling

Tektronix

thus formed permits the fractional nanosecond

ing successive samples currence structs the pulse on a of to a maximum bandpass tivity range results.

Accidental

Type

The oscilloscope such gages strain gages unit. The unit provides high low is Strain sensitivity strain per per division,

plug-in

of

the Type N include a risetime

of

10

of

::±:::

type oscilloscopes. The sampling system

(10"

at

the pulse under

relatively

of mv/cm 120 mv minimum

with

overload

of

2 mv

±4

Q

Type Q Plug-In Unit permits

as

the Type 536 to be

and

other

transducers. Excitation voltages for the

and

transducers are

drift. Frequency response

DC

to 6 kc;

major

and

risetime

is

calibrated

graticule

is

continuously

is

PLUG-IN

CHARACTERISTICS AND HORIZONTAL

Unit

is

designed for

display

of

repetitive

second

a slightly

approximately

or

nsec) risetime.

later

time at each re-

observation,

long time-base. Specifications

of

approximately

or

less

linear

volts dc

gain,

of

in

division to 10,000 microstrain

the Type N recon-

0.6 nsec, corresponding

noise;

range

before

is

permissible.

any

Tektronix

operated

provided

low

noise,

the Type Q Plug-In

60 microseconds.

10

steps from

variable

use

signals

600

mc;

a sensi-

and a dynamic

overloading

convertible

with

by

the

and

extremely

10

between steps.

with

By

tak-

strain

plug-in

Unit

micro-

APPLICABLE

DEFLECTION

Type

The Type T Time-Base voltages may be line frequency, external, matic on either rising

gering level is

required

Type

The Type Z Plug-In scope

of differential

erential

sertion range Unit

As

passband do v/cm

As a differential

common-mode signal level ± 100 volts Xl, Maximum

As a calibrated

available volt,

TO

BOTH

VERTICAL

SYSTEMS

T

Generator

from

0.2/lsec/div

or

high-frequency

or

is

adjustable. A signal

for

triggering.

sync. The

falling

Z

Unit

voltage

operation:

is

a conventional

not overscan the screen. The

to

and

zero

measurements. It can be used

(1)

as

a conventional

input

preamplifier,

comparator.

voltage

is

±2000

005%.

of

dc to 9 mc

25

v/cm

offers a

input signal

three comparison

to ± 10 volts,

With

range

of

cm.

Maximum

preamplifier,

with

in 9 fixed,

input

preamplifier,

common-mode

is

±1

differential

and

provides sawtooth sweep

to 2

sec/div.

slope

of

extends the accuracy

or

sensitivity

± 100 volts, the effective scale

resolution

the Type 536 for signals that

deflection

calibrated

rejection

volt/7nsec,

comparator,

voltage

zero to

The

trigger

ac

or

dc

coupled,

triggering

the

waveform,

of

0.2 volts to 50 volts

in

preamplifier,

(3)

as a calibrated of

50

mv/cm

of

the Type Z Unit offers a

factors

steps.

the Type Z accepts a with

input

ratio

of

or

-1

the Type Z makes

ranges; from zero to ± 1

::±:::

100 volts.

source

auto-

point can be

and

trig-

of

oscillo-

three modes

(2)

as

diff-

and

the Type Z

are

0.05

attenuation 40,000 to voll/5

nsec.

a

in-

1.

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1-3

NOTES

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SECTION

2

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General

In

order

to

help

soon

as

possible,

more

frequently

Oscilloscope

ner.

Other

covered

A

conventional

actually

interested in. To into

the

case,

screen shows

time.

The

in

conjunction

Unit

and CALIBRATOR cal

signal

ways

in Ihe

looking

input

we

use the

following

the

in this

is

connector

how

with Type output

you

begin

using

we

have

outlined

encountered

operated

of

operating

Operating

oscilloscope

at

some

accomplish

oscilloscope

the

instructions

the Type T Time-Base

K Plug-In

of

demonstration.

operations

in a

the

Instructions section

voltage

on the

voltage

illustrate

Preamplifier.

the

oscilloscope

of

your

new

in this section some

when

conventional,

Type

536

Oscilloscope

provides

this,

so

us waveform we

feed this

oscilloscope

thai

the

this

waveform

the use

is

used

with

Generator

The

oscilloscope

the

Type

triggered

of

this

manual.

a means

that

we

waveform

panel.

display

of

on the

changes

the Type 536

Plug-In

square-wave

for

the

of

In

the

536

man-

are

this

with

verti-

as

of

GETTING

ACQUAINTED

Type T

TRIGGER TRIGGERING TRIGGERING

STABILITY

5X

TIME/DIV VARIABLE (red knob) POSITION

(red

Type K

VOL

VARIABLE Ired knob] AC-DC VERTICAL

SLOPE

MAGNIFIER

(black knob)

and

black

TS/CM

(black knob)

POSITION

MODE

LEVEL

knobs)

+EXT

AUTO

full

right

(clockwise)

PRESET

OFF

5 MILLISEC

CALIBRATED

centered

CALI

BRA

TED

AC

centered

5

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Initial Control

Insert the

CAL

plug-in

Oscilloscope.

right-hand

front-panel

Type

536

INTENSITY

INTENSITY CALIBRATOR (red knob) CALIBRATOR (black knob) POWER

Triggering;

The CALIBRATOR square is a periodic other

wave.

waveform

Settings

Type

K Plug-In

receptacle

Insert the Type T Time-Base

or

HORIZONTAL

controls

by

as

MODULATION

the

AUTO.

signal-that

We

got a stable

setting the

Unit

in the

follows:

EFFECTS

mode

wave

is,

each

oscilloscope

into

the

front

panel

plug-in

receptacle.

[counterclockwise)

INT.

OF

you

have

wave

(stationary)

controls

left-hand

Generator

THE

is

identical

or

VERTI-

of

the

Type

into Set

full

left

UNBLANK

VOLTS

10

ON

TYPE T TIME-BASE

been

looking

to

every

display

so

that

of

each

536

the the

at

this

Connect a lumper oscilloscope K Plug-In OUT

connector

Turn the INTENSITY

trace FOCUS

screen should

TISM TY

controls,

suilable

Center the

tioning Txpe while control

front

Unit.

connector

on the Type T Plug-In

of

useful brightness

control

now

control,

K Plug-In

and

so

brightness.

display

controls. The VERTICAL

the

POSITIONING

the

horizontal

GENERATOR

horizontal given settings the

be

called

this can be

point

were

starting

sweep

on the

given in the

of

each

"triggering"

accomplished

from

the CAL.

panel to the

Connect

on

~he

control

for

the sharpest trace. The

be a square

slightly

that

Ihe

on

Unit

will

positioning.

INPUT

another

oscilloscope

display

the

lumper

Unil.

to the

appears

readlust the FOCUS

control

on the screen.

wave.

has the best sha rpness

graticule

POSITION

control

on the T Plug-In

CONTROLS

of

the spot across the screen

waveform

horizontal

the sweep. As in the

we

table

above. sweep

with a minimum

OUT

connector

from

to the TRIGGER INPUT

right

until a

display

Adjust

by

means

control

the

vertical

were

looking

For present purposes,

across the screen can

procedure

of

on the

the

VERT.

horizontal

Adjust

on the

the

ASTIGMA-

and

INTENSI-

of

the posi-

on the

positioning,

Unit

started

at. These

above,

adjustment

Type

SIG

and

will

at

the

a

by

-I

®®

2-1

Getting Acquainted - Type

setting the red TRIGGER (automatic) position. That triggering.

of

Because

one

of

you

don't BILITY controls are described later in this manual.

Effect

its simplicity

the most useful

have to adjust the TRIGGERING

controls when you

of

the POSITION control

536

SELECTOR

is,

we

of

operation,

triggering

use

the

knob

used the

modes.

AUTO.

the

mode.

in the

AUTO.

In

LEVEL

Uses

AUTO.

mode

af

mode

particular,

or

STA-

of

these

I

at

begins during a rising portion of the square wave,

of

left-hand end at

a time when the slope

is

This

+EXT., rather than to

Observe it at triggered

because the

Now

turn the black TRIGGER

now

begins during a

the left-hand end

the graticule. That

of

the

black

TRIGGER

-EXT.

that the

at

a time when the slope

display

falling

of

the graticule. That

is,

the sweep

wave

is

positive

SLOPE

turns upside

portion

of

the

is

(see

knob

knob to

down,

the square wave,

is,

the sweep

wave

is

the

triggered

Fig. 2-1). is

set

to

-EXT.

so

that

negative.

I

is

I

Turn the POSITION control back

the

display

Note right, then one above tioned

Now

the center

Effect

Turn the black

both to the right

tion.

zontally

Reset

Turn the red VARIABLE control to the left. this contracts the cycles

Now position.

The switch (black knob) control the number on

the screen when a

tion frequency

moves to the left

especially that if you position the knob to the extreme

of

the beam-position

the

graticule

off

center

reset the POSITION control to return the

of

the screen.

of

the

Notice

as

this switch

the

TIME/DIV

appearing

reset the VARIABLE control to the CALI

above

operations

will

toward

TIME/DIV

and

to the left

that the

is

switch to the

display

on the screen

and

of

waveform

is

displayed.

indicate that the

the right.

display turned.

horizontally,

point

the VARIABLE control (red knob)

cycles

and

forth,

and

to the

right

on the screen.

indicator

lamps

display

controls

knob successively to positions

of

the

100

MICROSEC posi-

expands

is

increased.

up the fact

of

the

having a given fixed repeti-

or

contracts hori-

100

MICROSEC position

so

that the number

that

display

which

Effect of the 5X MAGNIFIER

Turn the

the resulting horizontal expansion switch from that the portion two at

OFF

when the switch

With control throughout its range, been

Now

Effect of the black TRIGGER

Carefully at

the left-hand end

5X

ON

centimeters

is

expanded

the

5X

expanded

reset the

observe the

MAGNIFIER switch to the

to OFF of of

is

at

MAGNIFIER switch

beyond

5X

and

back severa I times.

the

waveform

the

graticule

to

occupy

ON.

and

the limits

MAGNIFIER switch to the OFF position.

part

of

the graticule.

ON

position.

of

the trace. Turn this

which occupies the length when the switch

the entire

at

ON,

notice that the

of

SLOPE

the

graticule

turn the POSITION

the graticule.

knob

display

Notice

which appears

that the trace

notice that

located

is

display

Notice

BRA

the

TIME/DIV

appear

Observe

display

posi-

to

that

of

TED

Notice

middle

length

has

TRIGGERI1'.J6

"""0,,

Fig.

GER

the

positive-going

of

the

Note SLOPE triggered

~hether

negative, knob back

times, observing the

to

see

falling

Now

The ING

Check that the black TRIGGER

that the TRIGGERING that the STABILITY control ING from the screen.

is

Slowly

until the trace reappears; adjust this control for a stable display gering

Remove the CALIBRATOR

on

the Type K Plug-In Unit. to disappear. INPUT connector

Next, times 0,

to while range

"TR.166E.R SLOPE.

AC.

2-1.

SLOPE switch is

waveform

MODE

." ~...

Triggering

where

that one

knob

is

to

when the slope

it

is

triggered

as

just described. Turn the black TRIGGER

and

how

you thus start the sweep on either a rising

part

of

the

return the

1--.-+-+--+-+--+----1-+--+--\

IJfCf

on

the

rising

portion

at + EXT.,

part

of

the

of

provide

forth between

waveform.

black

waveform

slope

the purposes

control over whether the sweep

of

when the slope

left-hand

TRIGGER

is

so

that

positive

the

+EXT.

end

of a waveform.

the Ithat I.

of

waveform

of

SLOPE

The

display

is,

during

the bla.ck TRIGGEi<

is

of

the

and

-EXT.

the

display

knob to

TRiG-

starts

during

that

positive, or

waveform

SLOPE

several

carefully

+EXT.

AC triggering mode; effect of the TRIGGER-

LEVEL

MODE

back +.

you

control

LEVEL

control

is

at

switch to AC.

turn the TRIGGERING

of

the CALIBRATOR square wave.

is

now

being effected in the

Now

so

that

slowly

turn the TRIGGERING

and

forth throughout

Carefully

do

of

this control provides a

observe the left-hand end

this.

Note

The

lead

Note

reconnect the CALIBRATOR

the trace reappears.

that there

SLOPE

knob

is

set

at

+EXT.,

is

turned full right PRESET. trace should

Turn the TRIGGER-

now

disappear

LEVEL

control to the left

We

say that trig-

AC

mode.

from the INPUT connector

that

this causes the trace

lead

to the

LEVEL

its

range from

is

a certain

display;

control

settings too far

of

-, the

part

several

through

display

of

part

is

or

and

the

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®®

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Getting Acquainted - Type

536

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towards the display.

Also notice that, in the

ING

LEVEL determines the height where the trace starts. If you the part the + waveform is part

Fig. GERING GERING starts TRIGGERING display of

so

waveform

falling Repeat the observations that you can still control the height trace storts (see

the VERTICAL POSITION control on the Type K Plug-In Unit back and forth, on the graticule. Observe the left-hand end of the while TRIGGERING

given point on the VERTICAL POSITION control.

and

part

of

the port

set

at

of

the

STABILITY

TRIGG~RING

STABILITY

TRI(,(,UING

2-2.

Effect

MODE

LEVEL

during

starls

the

two

that

the

Now

turn the TRIGGER

port

Fig. 2-3).

Reset

the

you

These

brief

AUTO.

or

the + marks on the panel result

part

of

control where you

or

"level"

of

its range, the

waveform.

of

(see

Fig. 2-2). Since the TRIGGER

+EXT.,

waveform

LEVEL

If you

its range, the

the

display

in each case starts on the rising

(where the slope

a

LEVEL

b

of

the

TRIGGERING

switch

is in

the

control

the

LEVEL

during

displays

display

appears

of

by

block

do

modes of

is

upper

control

the above, starls

upside-dawn-that

the

waveform

means

TRIGGER

so

that the

this.

Notice

LEVEL

waveform,

statements can be

AC

in

the + part

half

of

the

is

set

lower

control, the trace

triggering:

in

half

the

TRIGGER SLOPE

during

the

SLOPE

(where the slope

of

the previous

of

the TRIGGERING

SLOPE

display

that,

regardless

the range

get a display,

of

the

point

set

this control more

display

set

display

starts on the

this control more

starts higher on the

is

positive).

---

LEVEL

control

position.

leading

the -part

of

rising

knob

for a fixed

mode

laJ

of

its

edge.

the

leading

switch

part

to +

is,

paragraph,

of

the pdint where the

knob to

+EXT.

is

moved

always

of

to compare the

in

of

the TRIGGER-

this control

on the

waveform

towards

lower

towards

SLOPE

when

When

range,

(bl

of

its

edge.

of

the

EXT., it storts on the

is

LEVEL

up

setting of the

the setting

nR-'2.4

OR-'Z5

the the

the

display

When

range,

lin

is

at

+EXT.,

waveform.

so

that the

negative).

and

control

Now

and

display

storts

of

knob

TRIGTRIG-

the the

each

note

turn

down

at

the

AC

no

STABILITY

I

J

TRI('G~RIN('

TRI('G~RING

Fig. GERING MODE

from

set

at negative-slope LEVEL ing When range,

1.

2.

3.

4.

LEVEL

a

STABILITY

LEVEL

b

2-3.

Effect

of

the

TRIGGERING

switch

is in

the

AC

those

of

-EXT.

control

the

the the

It when you you

When horizontal input signal you are testing tion from one you is

In vides control storts on the

in the case

The periodic periodic only

Fig. 4 in This part

is

set

upper

half

TRIGGERING

trace

starts

is

necessary to adiust the TRIGGERING

use

the

you

reference trace on the screen, even when no

use

the

no input signal.

the

AC

AUTO.

waveforms.

waveforms

once

or

that

causes

the

of

the

waveform.

in

the + part

of

the

waveform,

LEVEL

during

the

AC

AUTO.

use

mode the TRIGGERING

of

mode.

the

is

used. This

equipment

point

to

AC

mode, no trace appears when there

of

the height

waveform

the

AUTO.

mode

is

at

random

position.

the

black

display

of

control

the

lower

mode

AUTO.

will

by

another

or

being observed.

mode.

useful when you are

The

AC

and

for waveforms which occur

intervals.

DR-Z2.

0"-23

LEVEL

control

when

the

These

TRIGGER SLOPE

to

start

101

ils

range,

just

as

is

set

half

of

triggering,

mode, you gel a desirable

be especially

moving

in the equipment.

"level"

mode

drawings

during

When

the

trace

it

did

in Fig.

in

the -part

the

waveform.

LEVEL

but not when

the input connec-

LEVEL

at

which the

This

is

useful for both

TRIG-

differ

knob

the

falling

TRIGGERING

starts

dur-

4.

lbl

of

control

handy

when

When

control pro-

trac~

is

not true

looking

is

or

its

at

i

The DC triggering mode

After

completing the previous POSITION control on the Type K Plug-In Unit to center the display

a

control for a stable as

sary, readiust the TRIGGERING display. You

vertically

possible to

Turn the red TRIGGERING

on the screen.

display

O.

are

now

triggering

operation,

Set

with the control located

MODE

LEVEL

the sweep in the DC mode.

use

the VERTICAL

the TRIGGERING

switch to DC. If neces-

control for a stable

LEVEL

as

close

I

®®

2-3

Getting Acquainted - Type

536

I

Slowly turn the TRIGGERING

back

and

forth throughout its range from

+.

Carefully observe the left·hand end you do this. you got when you used the AC mode.

Turn

the above operation. to

those you obtained when you used the AC mode. Return

the black TRIGGER

VERTIC

POSITION

Note

that the results are very much like those

the black TRIGGER

Again

SLOPE

AL

LEVEL

control severoI times

-,

through

of

the display

SLOPE

knob to

note that the results are similar

knob to +EXT

-EXT.,

and repeat

o

VERTICAL

POSITION

'---"---I

._-'--------'-_'---L_

__

o

CA.-I'

'-----L

olt.-18

0,

to

while

_

,

STABILITY

TRI('G~RIN('

"RI(;'G~RIN"

Fig. GERING MODE

mode,

elevation

(0)

its

range,

center

-

part

cule

STABILITY

2-5.

Effect

the

selling

of

When

the

line.

of

horizontal

LEVEL

LE.VEl

the

its

of

the

switch

of

the

point

TRIGGERING

display

lbl

When range, center

a

r---

Ib

TRIGGERING

is in

the

TRIGGERING

on

the

LEVEL

starts

at a point

the

TRIGGERING

the

display

line.

DC

graticule

control

starts

LEVEL

position.

LEVEL

at

above

LEVEL

at a point

control

which

is

set

the

In

the

the in

graticule

control

when

below

OR-21

_.-

\-.-

0;'-1.0

the

TRIG-

DC

triggering

determines

display

horizontal

is

set

the

starts.

in

grati.

the + part

I

-I-

I

the

of

I

I I

I

Fig.

2-4.

Effect

of

the TRIGGERING MODE switch is in VERTICAL

same

where

less

so Observe the left-hand end Notice control, the trace always starts cule, regardless control too low, point, the trace disappears.)

with the VERTICAL POSITION control, the waveform shifts slightly from left to right on the screen los shown so

Effect

notice that this raises Note cule

POSITION

graticule

of

Now

that the

Notice, also, that

that the starting point

Turn

in

height.

the

display

the

VERTI

CAL

turn the VERTICAL POSITION control back

display

that,

for

(see

Fig.

so

that the

of

the

VERTICAL

the VERTICAL POSITION control back and forth, and

especially that

either direction, one

VERTICAL

control

This is in

starts

at

the

POSITION

is

moved up and down on the graticule.

a given setting

of

the setting

2·41.

(If you position the trace too high

waveform

as

you move the display up and

and

if

you position

POSITION

the

DC

is

rotaled, contrast

same

point

control

setring.

of

the display

of

at

a given point on the

of

the VERTICAL POSITION

doesn't include this starting

always

has

EFFECTS

POSITION

lowers the display on the screen.

of

the beam·position indicator

control

position.

the

displays

to

the

AC

on

the

while

the TRIGGERING

the same position on

when

Even

though

start

triggering

waveform

and

you do this.

in

OF

TYPE

control

the

display

off

the

at

mode,

regard-

forth,

LEVEL

grati-

down

Fig.

K PLUG-IN UNIT

groti-

the the the

6),

or

When

the graticule. the starting point

height. If you move the TRIGGERING

+,

the starting point TRIGGERING "'ii'll be

lowered

The

four comments triggering In

addition,

pore the DC and AC modes

1.

2.

mode

the

When

you

at

a given point on the graticule, for a given TRIGGER·

ING

LEVEL

TION setting). But when you

trace always starts at a given point on the for a given TRIGGERING the VERTICAL POSITION setting).

The

DC mode

forms which change slowly.

the TRIGGERING

will

be near the

will

be raised,

LEVEL

control towards

(see

Fig. 2-5).

at

the close

apply

also to

following

use

setting (regardless

statements can be made

of

the

DC

is

especially useful for viewing wove·

middle

while

of

the section on the AC

triggering

triggering:

mode, the trace

of

use

LEVEL

CONTROLS

lamps, located direction the display you which order to get the trace bock on the screen.

Now

reset the VERTICAL POSITION control to return the

display to the center

above

the graticule,

is

positioned

way

to turn the VERTICAL POSITION control

of

the screen.

will

off

LEVEL

is

set

near

of

the

graticule

LEVEL

control

if

-,

the starting point

in

the VERTICAL POSI·

the AC mode, the

setting (regardless

indicate

the screen. This tells

towards

you move the

the

DC

mode.

to

com·

always

storts

waveform,

in

which

0,

of

in

I

II

2-4

®®

I

Getting Acquainted - Type

536

I

I I

I

Effect

Effects

of

the

AC-DC

Turn the AC-DC switch from

in

the position

shift the output has ponent. effect the display. play form being viewed. display to rise

Effects

Turn the black VOL

both to the right

waveform

both an ac (square wave) component

When

the AC-DC switch

of

the dc component

When

indicates both the ac

or

of

the

VOLTS/CM

switch

AC

of

the trace.

from the SQUARE-WAVE CALIBRATOR

of

the

this switch

The

fallon

is

and

dc component

dc component causes the entire

the screen.

controls

TSjCM

and

knob successively to positions

to the left

EFFECTS

of

the

SQUARE-WAVE

to DC.

This

is

waveform

in

of

Notice

the vertical

is

due to the fact that

and

a dc com-

in the

AC

position, the

is

excluded from

the DC position, the dis-

of

the wave-

the 5 position.

OF

THE

TYPE

CAI.IBRATOR

Notice

trols

Turn the the right and to the left you

positions, the amount increased. Similarly, when the switch

numbered positions, the vertical deflection

Reset

Turn the red MILLIVOLTS-VOLTS knob to MILLIVOLTS.

Notice

greatly.

black

PEAK-

TO-PEAK knob to of

the

10

set

the PEAK-TO-PEAK switch to the

of

vertical deflection

the

black

PEAK-TO-PEAK control to the

that this reduces the amount

Reset

the control to the VOLTS position.

position.

of

positions

Notice

higher-numbered

on

is

turned to

is

decreased.

vertical deflection

both

that when

the screen

lower-

10

position.

536

con-

to

is

that when when you numbered positions, the duced on the screen waveform flection

number positions.

Reset Turn the red VARIABLE knob to the left.

reduces the amount screen waveform.

position.

The switch (black knob) provide results from feeding a

peak

is

reduced.

is

increased

the block VOL

by

the oscilloscope SQUARE-WAVE CALIBRATOR Reset

above

operations

control

voltage

into the INPUT connector.

OSCILLOSCOPE

The

above SQUARE·WAVE CALIBRATOR controls the output-signal

nector.

Effects

triggered normally this control the

of

the

When

using the Type 536 Oscilloscope

manner, the INTENSITY

left

in

and

Operating

Instructions section

set

the VOL

amount

the SQUARE-WAVE CALIBRATOR

by

a like manner, the amount

In

the control

as

TS/CM

of

vertical

the VARIABLE control to the CALIBRATED

point

up the fact that the VOLTS/CM

and

the VARIABLE control (red knob)

of

the amount

waveform

CONTROLS

operations

amplitude

other

the INT.

the associated connector are

point

available

front-panel

UNBLANKING

TS/CM

of

knob to the 5 position.

deflection

of

vertical deflection which

having

switch to higher-

vertical deflection pro-

IS

turned to the lower-

Notice

produced on the

a given pea k-Io-

up the fact that the

at

provide the

CAL

control

OUT

controls

in

a conventional

MODULATION

position.

of

this manual.

control

Uses

explained

of

that

de-

this

of

con-

..

is

for

In

I I I

I

I I I

®®

2-5

II

1

NOTES

I I I

I

I I

I

I I

I

I I

I

SECTION

:3

I I

I

SPECIAL

1.

Turn INTENSITY moving slowly, to prevent face

of

the cathode-ray tube.

toward

-

INSTRUCTIONS

the left when spot

damage

to the phosphor on the

-

--

is

stopped,

-

OPERATING

INSTRUCTIONS

or

I I

I

I I

Fig.

3-1.

Transformer

2.

Operate nearly

as

possible transformer ing range instrument. an input given

3.

Make

is

not obstructed

NOTE

RED BLACK letters

is

voltage

in

Figures 3-1,3-2 and 3-3.

certain the

FRONT-PANEL

letters

go

connections

the oscilloscope from a power-line

in

the

is

connected. The indicated on a metal

If you

want

other than indicated,

air

and

that the

with

RED

go

with BLACK knobs.

for

117-volt

middle

to operate your oscilloscope using

intake

knobs.

of

power-line

at

the rear

air

filter

COLORS

operation.

the range

voltage

tag

at

use

of

is

clean.

the rear

the information

the oscilloscope

voltage

for

which the

and

as

operat-

of

the

Fig.

3-2.

operalion

Fig.

3-3.

Fan

connections

move

upper

Transformer

for

fan

lead

connections

117-volt

10

sial

for

operation.

indicated

234-volt

by

the

operalion.

For

arrow.

234-volt

I

®®

3-1

Operating Instructions - Type

536

GENERAL INSTRUCTIONS

Overloading

of

the deflection

I I

systems

Fig.

3-4.

For

Maintenance

information

section.

on

core

of

the

air

filter,

refer

to

the

PRELIMINARY INSTRUCTIONS

Cooling

A fan maintains safe operating temperature 536 Oscilloscope. Air the rectifier and other components. therefore be placed blocked. air found

If the interior temperature does rise too high for some

reason, a thermal cutout switch and keep it disconnected until the lemperature drops to 0 safe value.

The

air

circulation. Instructions for maintaining this filter are

in

the Maintenance section

is

circulated through a filter and

so

the

air

intake,

filter

must

be kept clean to permit adequate

of

this Instruction Manual.

will

The

disconnect the

in

the Type

instrument musl

at

the rear,

ovei

is

not

power

Time-delay relay

A lime-delay relay delays the applicat"lon de

to the circuits long enough for erating temperature. seconds. If you switch the ac power off, even briefly, the time-delay relay

The

time delay

will

delay reapplication

all

of

the rectified

heaters to reach

is

approximately

of

the

de.

op-

25

Power requirements

The

regulated power supplies in the Type 536

with line voltages from

volts.

For

maximum

should be near the center

Voltages outside

on

the trace and cause your Type

Be

sure

the line are present. Unless tagged otherwise, your oscilloscope connected

voltage

at

the factory for 115-volt operation.

105

to

125

volts or from 210 to 250

dependability

of

these limits may cause

is

correct

and long life, the voltage

this range.

536

if

indications

will

operate

hum

or jitter

to lose calibration.

such

as

these

3-2

Above full the oscilloscope display. Reduce the size to minimize the distortion.

10

me,

it

is

possible to

10

division deflection. You

overload

will

see

this

of

Plug-in units

The

Type 536 Cathode-Ray Oscilloscope for both HORIZONTAL and VERTICAL deflection systems. A list of

available section

changing plug-in units. Although the removal unit

taken out regulation due to the reduced loads components

of

We

recommend that you turn your Type 536

will

not

plug-in units

this manual.

affect the instrument,

at

the same time, the power supply may

in

the instrument.

is

located

uses

in

if

both plug-in units are

and

this may

Positioning the trace

Controls for positioning the trace

in

units.

The

POSITION control on the plug-in unit located

in

the

right

or

HORIZONTAL side positions the trace hori· zontally. Similarly, you plug-in unit that position the trace vertically.

is

use

located in the

are

located on the plug-

the POSITION control

left

or

VERTICAL side to

TYPICAL OPERATION

Using a time-base plug-in unit

AC, AC

is

LF

REJECT

1.

Turn POWER switch off.

2.

Connect the cycle power.

3.

Insert a preamplifier plug-in unit into

side. Insert the Type T Plug-In Unit

ZONT

4.

Turn the POWER switch to

5.

Set

the Type 536 controls

INTENSITY

FOCUS

ASTIGMATISM INTENSITY Set

the red CALIBRATOR control

CALIBRATOR control to

Set

the black VOLTS/CM switch on the VERTICAL plug-

in unit to

and

power

AL

side.

MODULATION

5.

DC modes

cord to a source

ON.

as

follows:

10.

INT.

to VOLTS, the black

without having as

distortion

the crt display

plug-in units

the Specification

of

one plug-in

of

115-volt,

the

into the HORI-

full left centered centered

UNBLANK

of

off

while

go

out

of

damage

on

the

60-

VERTICAL

I I I I

I

I I

I

I I

I

Set

the Time-Base

6. TRIGGER TRIGGERING TRIGGERING STABILITY 5X

MAGNIFIER TIME/CM POSITION

7.

Connect a lead

8.

Connect a INPUT

on

After

30 seconds

trol

right

until the STABILITY or LEVEL You

The and the AC, procedure ence.

For AC,

1.

2.

3.

control

three degrees

control

may

need

procedure

TRIGGERING

AC

is

AC

Turn the full

right,

Turn the STABILITY pears, then

Turn the display the STABILITY

SLOPE

the Type T

left

to

LF now

LF

TRIGGERING

getting a free-running

TRIGGERING

of

plug-in

MODE LEVEL

from CAL

lead

from

warm-up

trace

left until the

further

for a stable

adjust

just

described

LEVEL

REJECT,

repeated

REJECT,

two

or

three degrees

the

input

control

unit

controls

OUT

to the VERTICAL INPUT.

VERT.

SIG.

plug-in

is

left.

the STABILITY

controls

and

control

unit.

time, turn the INTENSITY con-

visible

on the screen. Turn the

trace

Next,

display

for

operating

is

the

DC modes

in step

and

signal. slightly.

DC modes

LEVEL

left until the

LEVEL

You

form

and sweep.

control

as

.5

OUT

disappears,

turn the

of

the

control

procedure

of

triggering.

for

your

of

triggering:

STABILITY

further

left

may

need to

follows:

full

MILLISEC

centered

to TRIGGER

TRIGGERING

input

the STABILITY

left.

+EXT

AC right right

OFF

then

two

signa

slightly.

to

use

for

This

easy refer-

controls

trace

disap-

for a stable

adjust

AUTO mode

To

use

the

AUTO

mode

of

triggering, signal to the TRIGGER INPUT. Set the TRIGGER SLOPE switch to AUTO. most and controls

HF

+EXT

and

the

TRIGGERING

The time-base

trigger

2 megacycles. The STABILITY

are

signals

switched

generator

between

out

of

the frequencies

the

SYNC mode

will

circuit

connect

now

and

TRIGGERING

in the

the

MODE

switch to

synchronize

of

50 cycles

AUTO.

trigger

with

LEVEL

mode.

Amplifier-phasing adjustment

We type The AMPLIFIER for same taking

ING

1.

2.

3.

4.

5.

I.

6.

7.

8.

9.

The

adjusted turn the INTENSITY both screen can

recommend

when

phase-shift

type.

your

adjustment:

Turn POWER switch Connect

cycle

power.

Insert into

the Type 536.

Turn the POWER switch to

Set the Type 536

INTENSITY FOCUS ASTIGMATISM

Set the VOLTS/CM

VARIABLE VERTICAL

Connect ating have

the same

be

terminated pedance. of

this resistors. INPUT plug-in to the a

sine-wave 190A, to the Set the Type the phase measurements.

Turn the INTENSITY With

about 5 em

FIER

PHASING

a

straight

vertical

to

deflection

damage

that

making

You

two

resistors. The

manual,

receptacles

symmetrical

have

phase measurements

PHASING

variations

will

measurements.

the

power

preamplifier

controls

POSITION

two

coaxial

in

Refer

Connect

units. Join the

generator,

coaxial

190A

control

line

of

and

horizontal

the same

control

systems.

the

Operating

you

control

between

usually

off.

cord

controls

on

both

impedances;

a resistance

to

the Accessories section

for a listing

the

of

branches

tee. Use to the

control

vertical

positive

Leaving

phosphor.

Instructions - Type

use

two

plug-in

permits

two

make

this

adjustment

To

make

the AMPLIFIER PHAS-

to a source

plug-in

cables two

cable-terminating

the VERTICAL

unrerminated

so

amount

left

units

ON.

as

follows:

plug-in

units

both

of

equal

cables

however,

equal

of

cables

of a coaxial

such as the

an

frequency

right

deflection, that

the oscilloscope

sloV~,

inclining

deflection

of

before

removing

a spot

units

and

curve tracing.

a slight

plug-in

of

the same

as

follows:

to same

full

length

are

not

each

to its

and

resistors to the

and

HORIZONTAL

ends

of tee. Connect

Tektronix

adapter,

to be used

to

give adjust

at

systems

phase shift.

stationary

536

of

the same

adjustment

units

of

just

before

115-volt 60-

type

full left centered centered

position

right

centered

to termin-

required

cable

must nominal at

the back

terminating

the cables

Type

if

necessary.

a trace.

the AMPLI-

displays

45 degrees.

are

now

Always

signals from

on

the crt

the

to

im-

in

I

In

the

HF

SYNC not used. by

tion. The HF SYNC 5 megacycles to

You in the Instruction Plug-In

adjusting

will

Unit.

Synchronized

the STABILITY

about

find

Manual

mode

operation

mode

15 megacycles.

specific

for

the

TRIGGERING

control

will

operate

information

the

Type

LEVEL

of

the

sweep

for a stationary

with

most signals

on

Triggering

T Time-Base

control

is

obtained

presen ra-

from

Modes

Generator

is

Phase measurements

Phase-shift VERTICAL minimized the same kind, plished

for

differences amplifier by

careful design. Using

internal

frequencies

between

channels

AMPLIFIER

as

high

of

the

as

the

HORIZONTAL

Type

suitable

PHASING

20

me.

536

plug-in

can

We

and

have

been

units

of

be

accom-

recommend

3-3

Operating Instructions - Type

the

use

of

two

Type K Plug-In Units for measurements

8

me.

One

AMPLIFIER measuring frequency, ate

precision. If higher precision calibrate function The pensated errors switches are stepped from range to range.

the scale

of

frequency, for a

plug-in unit input attenuators cannot be perfectly com-

for

all

are

introduced when the plug-in unit

PHASING

is

sufficient for measurements

of

the AMPLIFIER

frequencies. Slight high-frequency phasing

536

adjustment,

is

particular

at

required, you can pre-

PHASING

pair

control,

of

plug-in units.

above

the highest

of

moder-

as

VOLTS/CM

I

4.

Use the POSITION control ZONTAL graticule

a

Fig. 3-6, equal to each other. the specific value chosen for the dimensions a does not

5.

Measure the dimensions A

6.

Using of from

channel to center the ellipse line.

Make

affect

the accuracy

thE?

formula shown in Fig. 3-6 calculate the sine

the desired phase

your

slide rule

of

the plug-in unit

the dimensions a

Within

of

the- measurements.

and B as

angle

e.

Determine the

or a trigonometric

in

the HORI-

about

a vertical

and

b, shown

reasonable limits,

and

shown in Fig. 3-6.

angle

table

of

sines.

in

b

e

I I

I

~TYP'S36

Terminating Resistors

~

Type

190A

Signal

Generator

'-'

Fig.

3-5.

Circuit

connections

A typical setup

circuit

is

shown

in tested are amplifiers, transformers cribe high-frequency phase measurements connections are

similarly performed.

1.

Select the your phase measurements. to the impedance FIER section.

2.

Make

are

required. Measurements

coaxial

HORIZONTAL

of

the circuit under test. Perform the AMPLI-

PHASING adiustment

the circuit connections

for

phase

for

phase measurements on an external

Fig. 3-5. Examples

To

cables

and

channel should match the

Vertical

~

I-f-o

measurements.

of

circuits that can be

and

filters.

at

make the phase measurements:

terminations to be used

The

impedance

as

outlined in the preceding

as

shown in Fig. 3-5.

I,

Oscilloscope

Horizontal

~

Circuit

Under

Test

We

where

audio

frequencies

of

will

coaxial

the

....

I--

des-

in

cable

output

a

A

Fig.

3-6. A typical

inclination

The phase relationship for angles between a A straight line cates a a-degree phase relationship. Elliptical patterns be

obtained

angle

is

increased, the inclination progressively. phase

angle beyond rogress-repeating, described fusion in interpreting the sketches sheet. The sign determined from a An interchange VERTICAL channels described more convenient.

180 degrees, the inclination

of

ellipse.

of

the ellipse gives an indication

of

positive slope (inclining to the right) indi-

for intermediate phase angles.

One

axis

of

90

degrees.

in reverse

above

in

the

this

for angles

elliptical

(+

or

knowledge

of

the cables to the

will

paragraph.

of

patterns

-)

not

b

the ellipse

As

order,

less

data

of

the phase

of

alter

Use

B

A

= -

!3

and

180 degrees.

As

the phase

of

the ellipse

will

the phase

of

the ellipse

the

than 180 degrees. Con-

is

often

are

included on the data

angle

the circuit being tested.

the sequence

whichever

will

change

be vertical for a

angle

increases

will

elliptical

avoided,

HORIZONTAL

patterns

if rough

can usually be

of

patterns

connection

of

the

will

ret-

and

I I I I I I I I I

is

I

3.

Adjust the plug-in unit a suitable ellipse on the oscilloscope screen. of

the ellipse

within the

ellipse

will

to

overloading

the

elliptical degrees. is

independent

is

graticule

have to be reduced to prevent distortion due

of

pattern

The

procedure of

VOL

not critical;

area.

the

deflection

displayed

for

the shape

TS/CM controls until you get

use

any

Above

of

10

systems. Fig. 3-6 shows

for

a phase

measuring the phase

the ellipse.

3-4

The

height

convenient height

me,

the size

of

angle

the

of

45

angle

Curve tracing

The

horizontal Type 536 Cathode-Ray Oscilloscope Therefore, is

always dependent variables. The independent plotted

able

along

is

normally

in

plotted

using

the

and

your as

a function

horizontal

plotted

vertical

Type 536

axis

along

the vertical axis.

deflection

for

of

while

systems

are

voltage-sensitive.

curve tracing,

the independent

variable

the dependent vari-

voltage

is

The

of

the

and

usually

repeti-

I I I

I

I I

I

tion rate of give a bright, consistent disploy. Repetition rates and greater cps

you will obtain

using

the

independent variable should

will

give

on

intelligible presentation. Below

the

desired information more readily

photographic techniques.

be

chosen

of

60

to

cps

60

Operating

To

assure coincidence of

at

the

origin, should be adjusted cedure for

paragraph, titled Amplifier Phasing.

the

this

Type

to

adjustment

the

horizontal and vertical

536

amplifiers and preamplifiers

like amounts of

is

described

Instructions - Type

phase

shift.

The

in

a preceeding

536

axes

pro-

I I

I I I

I

FUNC1'IONS

CRT

Controls

FOCUS

INTENSITY Control to vary the brightness

ASTIGMATISM Control

SCALE

ILLUM. Control to vary the brightness

INTENSITY

MODULATION grid.

INTENSITY Coaxial connector to crt grid through

MOD. INPUT

Control to adjust the beam for maximum sharpness

CUS

mum

cule illumi notion.

Three-position switch

positions switch.

of

the trace.

used

in conjunction with

control to adjust the beam for maxi-

sharpness

of

the

selects

of

the INTENSITY MODULA

trace.

OF

of

the trace.

the

of

the

signal to crt

CONTROLS

AMPLIFIER PHASING

SQUARE·WAVE Three-position switch turns CALIBRATOR

FO-

grati-

EXT

nON

(red knob) SQUARE-WAVE

CALIBRATOR (block knob)

CAL. HORIZ.

OUT the signal from the HORIZONTAL ampli-

VERT OUT

POWER

AND

CONNECTORS

Auxiliary

Variable capacitor to correct for slight

phase differences between

on

and

put. Nine-position switch

voltage from a precision voltage divider.

OUT

SIG

SIG. Front-panel connector supplies a sample

Coaxial connector from the calibrator. Front·panel connector supplies a sample

fier. Output signal amplitude deflection; minimum amplitude volt/div.

of

the signal from

fier. Output signal

amplitude

crt deflection; minimum amplitude volt/div.

On-off transformer and fan.

Functions

selects

is

nominally 1

is

switch

pi

ug-in units.

the

MILLIVOLTS or

selects

is

dc-coupled and

the

is

dc-coupled and

nominally 1

in

the lead to the power

VOLTS

the

volt/div

VERTICAL

volt/div

calibrator

of

the

is

ampli-

of

is

out-

of

the

crt

0.75

the

0.75

I

®®

3-5

NOTES

I

I I I

I

-----------

-

I I I

I

I I

I

I I

SECTION

I

I I I

I

Introduction

The

Tektronix Type 536 ing two Tektronix Plug-In Units for amplifiers (plug-in units) inserted into the vertical- and horizontai-deflection circuits, the instrument

making phose measurements, for curve tracing, other

applications

characteristics are required. The instrument may be used

a standard oscilloscope Generator and

deflection circuit. quired the vertical-deflection circuit,

amplifier

cuit.

Plug-In Unit into the horizontal deflection circuit,

any

of

or

desired, the Time-Bose Unit may be inserted

may

where

the Preamplifier Plug-In Units into the vertical

Or,

be inserted

is

on

"X-Y"

oscilloscope, requir-

operation.

may

deflection

by

if a calibrated

into

amplifiers

inserting a Tektronix Time-Bose

verticai time-base

in

which case the desired pre-

the

horizontal-deflection

With

two

pre-

be used for

and

with identical

is

into

for

re-

cir-

Deflection Amplifiers

The Type 536 Oscilloscope has almost identical amplifiers, the main difference being the PHASING network. Since the a description to the

The amplification Amplifier by

two voltage (the exact

brated the plug-in unit, the crt.

The unit (through pins 1 and 3 applied VERT. and

is

this control crt agrees unit when the red VARIABLE

to the CALIBRATED position.

High-frequency provided stage. for

adjusting the compensation for

DC shift

de

and

of

the Vertical

Horizontal

Vertical

cascaded,

gain

so

signal to be

to the grids

GAIN

thus used to

The

extremely low-frequency transconductance

Amplifier.

Amplifier

(the Input

V354-V364, (V354A & B SIN 101-614) separoted

cathode-follower,

of

the

amplifier,

gain

depends on the sensitivity

that a .1-volt, peak-to-peak signal, received from

will

produce one division

amplified

of

ADJ.

R313

set

is

adjusted

with

the front-panel

compensation

by

the peaking coils in the

variable

in

the

inductors

amplifier

amplifiers

Amplifier

consists

Amplifier

which

is

of

the Inter-connecting Plug) the Input regulates the

the

gain

of

so

that

the vertical

volts/div.

for

L304

tubes

... 0 condition

configuration

are

will

also be

of

two

stages

V304-V324

isolating stages. The

is

approximately

of

obtained

Amplifier

cathode

the stage.

calibration

control

the Input

plate

and

L324

optimum

deflection

of

the

almost

identical,

applicable

of

push-pull

and

the

Output

100

the crt),

of

from the plug-in

V304-V324. The

deflection

of

is

circuits

provide

results.

is

cali-

deflection on

and

degeneration,

In

operation,

on the

the plug-in

set

full right

Amplifier

of

the

a means

whereby

the

is

less

as

CIRCUIT

DESCRIPTION

than

at

higher frequencies

constant network that shunts each

and

C364 form the

load

resistor for V304, work that shunts de

and

extremely

RC

networks

load

resisfors plate-load the signals increases, however, the impedance networks approaches a minimum value

the

plate-load creases the gain the extremely higher transconductance

For the frequencies

sistors

of

vide a small amount Amplifier. sation, makes the de response of the

mid-frequency response.

The signal to be

Amplifier C.F.

stages V333

a high-impedance,

fier; they also

the

Output

The

.75-microhenry interstage inductors, together with the PHASING signal

delay

Amplifiers.

Amplifier fier, lay. This

of and Vertical C252

as cuit

the

delay

crt

is

The push-pull quency compensation for this stage able R359 is

is

and

provides a slight amount

the electron beam between the vertical

the horizontal

Amplifier

and

the capacitance,

is

decreased, the caoacitance

other

time in both channels,

display,

plate-loaded

shunt peaking coils L350

regulates the

adjusted for

R324,

low

is

so

high that their shunting effect

is

negligible.

resistance remains

resistance to a minimum

of

low-frequency

the Input

This feedback, together

to the

Output

and

low-capacitance

provide a low-impedance

Amplifier.

capacitor

between the Second

(The

Signal-delay

slightly

additional

is

C253 SiN 101-614) in the

is

increased.

can be adjusted for

drive

for the vertical

optimum

...

is

compensated for

RC

network

and

R333

the

plate-load

frequencies, the impedance

For signals at

the stage slightly, for

range,

of

the tubes

at

which they shunt the

Amplifier,

of

amplified

V343. The

C352,

different

delay

deflection

gonged

and

Output

voltage

these

positive feedback from the

Amplifier

provide

than that

compensates for the transit time

plates

differentially

hence the

With

this arrangement the signal

and

optimum

Amplifier

and

on the common screen

linearity

plate

load

resistor.

that shunts

and

1.6

K.

and

above

with

is

coupled by

cathode

load

for

network

of

in

Horizontal

and

hence the phasing

deflection

is

L356.

in

R304,

C362 form the

resistor for V324. At

in

this range, the

As

the frequency

of

150

K,

of

1.58

all

signals

compensates for the

this range.

plate-load

RC

networks also pro-

the de shift compen-

amplifier

from the Input

the First

followers present

for the Input

driving

a small

C.F.

and

in

the

in

the Vertical Ampli-

additional

deflection

the crt.) C352 in the

with C253 (with

delay

time, in one cir-

the

delay

results.

stage provides the

plates. High-fre-

provided

The

SCREEN

the output waveform.

by

a time-

R326

the plate-

RC

net-

of

these

of

the plate-

of

the

RC

which lowers

K.

This de-

above

re-

Output

equa I to the

and

Second

Ampli-

source for

amount

the

Horizontal

signal de-

Amplifier,

by

Output

plates

time

of

the vari-

ADJ.

grid,

of

so

in

the

and

I

®®

4-1

Circuit Description - Type

The

Output shift by C364

in impedance resistance load

resistors ever, the mum

value

is

lowered COMPo amount

Indicator

The the junction regulates the TION

INDICATOR

at

the

grid,

centered

the

voltage potential the lamp. Thus, the lamps centered above

or

at

the

plate

will

fire, moved. For center

of

SIN

101-614)

V364 (V354A, SIN 101-614) the

voltage

the

plate across B379 positioned condition

A sample

by

the Vert. Sig. on the instrument. The is

adjusted

the beam

Amplifier

R362

and

the other.

of

the

for

each tube

R350

impedance

of

82K,

to a minimum

control

of

vertically

indicating

R363

compensation

of

the

potential

and

thus

at

the

across each

vertically

below

of

example,

the crt, the

will

at

the

of

the tube to rise.

and

below

will

result

of

the signal

so

that the

is

centered

C362 in one

At

dc

RC

networks

and

of

and

Amplifier

two

CENTERING control

at

on the crt, this control

plate

lamp

on the crt. If the beam

the center

V374A

the

increase

grid

cause this

the center

and

Out

C.F.

vertically

536

stage

is

also compensated for de

plate

and

extremely

is

so

is

1.25 K (the

R356).

At

these networks

the

load

of

1.23K. The

provides a means

for

optimum

V374A regulates the

Beam Position Indicators,

across each lamp. The BEAM POSI-

the

plate,

of

V374A

is

less

than the

are

extinguished

of

the crt, however, the

will

change

direction

if

voltage

of

VERT.

dc

in

which

the beam

at

the

and

the

will

decrease. This

V374A,

B385

at

V374B to- a front panel connector

level at the connector

and

This-

lamp

of

the crt, just the

will

the

plate

SIG. OUT. DC lEVEL ADJ.

on the crt.

Power Supply

Plate

and

filament Oscilloscope T600. may be connected in or

in series

are

employed

power

four supplies furnish volts,

+225

has an

lator

tube in the

necessary to

supplies have their

relay power tion

of ment until the temperature brought

Reference

by

a gas

which has a constant

is

The

primary

for

supplies. ISelenium rectifiers,

volts

unregulated

regulate

K601

remains

switch has been turned on. This prevents the

any

dc voltages to the

up

to a point sufficient to produce

voltage

diode

power

for

the tubes in the Type 536

furnished

210- to 250-volt

for

the four seporate full

and

high-voltage

Voltage-Reference Tube V689. This tube,

has

two

parallel

regulated

+350

output

of

this supply

own

regulation

open

for

for the

voltage

by

a single

equal

for

105- to 125-volt

operation.

voltages

volts. The

about

supply

as

about

amplifier

of

the tube heaters has been

-1

SO-volt supply

drop,

circuit,

and

by

R364

and

low

frequencies, the

high that the

value

higher

approaches

resistance

results.

R375

V374A.

is

such

and

one

the beam has been

is

positioned

plate

voltage

cause the

will

increase the

to fire. If the beam

fire.

of

power

tapped

wave,

SIN

of

+225-volt

+360

for

the

high-voltage

circuits. The

thirty

tubes

cathode

establishes a fixed poten-

plate-load

of

the plate-

frequencies,

for

VERT.

for

adiusting the

sets

With

adjusted

a value that the

firing

when

is

of

V354 (V354B,

at

V354

windings; these

Silicon rectifiers

101-1202). The

-1

SO

volts

the crt. It

seconds

is

how-

a mini-

each

tube

DC SHIFT

voltage

and

thus

the

voltage

the trace

so

that

potential

the trace

positioned

voltage

the lamps

above

the

plate

will

lower

voltage

opposite

is

coupled

R395

is

zero when

transformer

operation,

bridge-type,

volts, + 100

supply also

for

the oscil-

is

power

time-delay

after

applica-

in

the instru-

emission.

established

the

un-

the

at

of

at

of voltage

voltage

in

is

tial

of

about

-84

volts

at

the

grid

difference

-1

SO

appears

the

Should the

put

proportion, two pears again series tube V687 is

no

to set the appearing voltage at

plates

the series tube, which for

C628 to the

established value of

the

cuit to sudden changes in

The

+ 100-volt supply. The

lishes a

plifier bias change at

the

will cathode

voltage

volts. C662 improves the response

to

sudden changes in

A small sample at pearing produce a ripple

will plate

ode

volt the circuit in the presence

The + 100-volt

75

Plug-In Units. The activates the the circuit. If either Plug-In strument, however, the into supply.

Rectified transformer regulator the volt essentially zero

amplifier.

the

difference

divider

ADJ., determines the

at

the

across the

output

voltage

loading

voltage,

grids

the plates

the change in the

required

appear

the screen

be

of bus. This some

volts

the circuit to

-1 regulator,

the

of

V696. The error signal

at

the

grid

amplified

attenuation

dc

level

at

drop

across the tube

of

the tube. This change

output

feedback

-1

SO-volt

voltage

V656 (the

the

output

grid

of

at

of

V617 A

will

be returned to its established

at

the screen (which acts as

opposite

of

V617A. This tends to cancel the

V617A,

at 1SO

relay

voltage

is

to supply

SO-volt supply serving

The

grid

amplifier,

consisting

grid

potential

and

in V674

by

the grids

of

the tube. This

of

loop

of actual

by the tube). If the

V656. The

the

of

V656

in

and

regulator,

milliamperes, dc,

added

the

at

of

percentage

of

V696A

divider.

is

exactly

an error

of

in

at

and

supply

essentially zero

voltage,

will

of

component

K668

mainlain

power

divider

the

-1

on the supply tend to change the out-

at

the

amplifier

and

the neon lamps

the neon lamps; they

the

grids

of

the series tube

will ouptut

pulls the

-1

SO

volts. C695 improves the

and

increases the response

output

serves

voltage

error

grid

of

follow

output

the

unregulated-bus-ripple

through

polarity

hence reduces the

circuit

of

through

total

heater current (300 milliamperes)

and

relay

from terminals 7

to the

for

R648-R649 establishes a

grid

potential

V696A,

R696,

and

This

control

SO

the

voltage

is

coupled

of

and

in

be a

voltage,

at

on

signal the series tube V617A. The the

voltage.

R656.

at

to the

also improves the line

voltage

for

removes the shunt

Unit

closes

the

regulation

voltage

the

as

the reference

of

V646B,

of

V696B,

is

R697

thus determines the

volts.

grid

of

\vill

is

V674. The

B681

V687. The

hence change the

change

voltage

direction

output

voltage.

as

a reference

divider

at

this

loading

error

will

grid,

of

This

an

the

grid

ripple

R667

the tube heaters in both

is

removed

and

supplying

+225-volt

one-half

for

the

other

obtained

ond

R698.

of

total

voltage

is

adjusted

V696A

will

exist

between

amplified

error

to the grids

and

B682. There

are

simply used

error

will

change

in

voltage

at

the plates

to compensate

is

coupled

voltage

the

grid

voltage

and

the

ripple

variations.

and

one-half

bock to its

of

R663-R664 estab-

grid

of

is

equal to the

should tend to

will

be

amplified

thus the

value

regulator

will

ripple

signal

injector

of

V617A which

appearing

ripple

at

on the + 100-

regulation

R668,

R669

from the in-

R669

is

connected

of

the + 100-volt

14

of

the

the + 100-volt

regulator.

for

the + 225-

voltage

of a differ-

R697,

and signal

of

grid)

the cath-

provides

of

half

from a

the

that

total

so

that

change

the

ap-

of

the

voltage

the

voltage

at

the

of

through

ac

gain

the cir-

for

the

the am-

appear

and

output

+ 100

circuit

appear

ap-

will

at

the

from

power

With

a

is

of

I I

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4-2

@@

I

Circuit Description - Type

536

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ence amplifier.

output

voltage, ference fier V634. The signal ity V637. The cathodes grids, and thus the output established value of the regulator circuit to sudden changes in output voltage.

The functions the same

supply.

provided the high-voltage supply

transformer volt This regulator;

+350-volt

CRT

three separate ages

main components are V800 and the C806.

tor-input filters. Separate supplies are required for the cathode and ing to the

In

supplies provides an accelerating beam. V842 supplies

crt (the actual

TENSITY control

the crt, and thereby maintain the

loscope, it

the crt remain constant. the three supplies, by comparing a voltage to the regulated applied which regulated the percentage V8J6A divider. voltage

nal

amplifier

by

V634, and

ripple-cancellation circuitry

As

mentioned previously, the

Rectified

regulator te furnish circuit operates in the same manner

Circuit

A single 60-Kc

for

The rectifier circuits are the

grid

Unit

is

used to sweep the crt horizontally.

V822 supplies

+3200

In

order to maintain a constant deflection sensitivity

to the

is

and

When

will

If the

-800-volt

will

appear

If

the

loading

the error signal

and

will

appear

of

+225

as

an unregulated

for

voltage

is

for

regulator

the crt. The

grid

is

connected between the

+225-volt

from terminals 5 and

added

power

circuits

necessary that the accelerating potentials

thus

be exactly

to the

this reason no further description

is

necessary.

Oscillator

supplies that

Oscillator

in

order

supply when a Time-Base

-800

volts for the cathode

volts for the post-anode acceleration. This

about

voltage

grid

of

this control

depends on the setting

R831).

of

V8l6A,

supply. The

total

voltage

determines the total

-800

supply should tend

at the

grid

should tend to change the

will

be

amplified

appear

be

the series tubes

voltage volts. C647 improves the response

that described for the + 100-volt

output the crt.

power

voltage

This

-150-volt

at the

grid

amplified

at the grids

voltage

circuit furnishes energy for the

to

-920

is

of

and reversed

of

will

be pulled back to its

in

the + 225-volt supply

+225

volt

of

about

+360

10

supplying the

for the

is

half-wave

supply dc-coupled unblank-

accomplished by

is

-800-volt HV

that appears at the

properly adjusted, the

volts.

V816A, since the cathode of

+350-volt

as

provide

primary

of

volts

obtained

accelerating volt-

the

Hartley

of

type, with capaci-

Generator

of

4000 volts for the crt

for

the

calibration

"sample"

supply.

from a

supply

ADJ.

R811

voltage

to

drift,

by the

dif-

of

the

ampli-

in

polar-

the series tube

follow

regulator also

of

the + J

type, whose

T801

the crt. V832

grid

of

This

an error sig-

the

volts for

the

power +225-

supply.

OO-volt of

the

tuned

by

Plug-

of

the

IN-

the oscil-

regulating

the high

"sample,"

divider

and

the

determines

grid

across the

output

in

of

this tube

The error signal

the output lator tube, thereby

Unblanking

DC-coupled unbJanking [when a Time-Base

In accomplished by for the

+225-volt

"moved".

any other supply and from the Time-Base

the crt via the supply.

The move the the required time. To overcome this, an isolation network composed rangement, the fast coupled directly to the duration supply itself ing pulses (at slower sweep rates), however, the stray capacitance grid blanking pulse.

is

connected to the

will

be

of

V816B varies the screen

controlling

Unit

is

employed in the horizontal deflection circuit)

employing

grid

and cathode. The cathode supply

regulated supply, and therefore cannot be

The

grid

supply, on the other hand,

is

Generator

Unblanking

stray capacitance

floating

of

blanking pulses (at the faster sweep rates) the power

of

the circuit

at

the unblanked potential for the duration of the un-

supply fast enough to unblank the crt

C835,

R835 leading

is

not

appreciably

is

charged through

-150-volt

amplified

its output.

separate high-voltage supplies

"floating".

are transmitted

C.F.

V843 and the

in

the circuit makes it

and

R836

edge

of

grid

of

the crt via C835. For short-

moved. For longer unblank-

regulated supply.

by

V816A and V8l6B;

voltage

Generator

The unblanking pulses

to

is

employed.

the unblanking pulse

R835.

This

of

the oscil-

is

tied

is

not tied to

the

grid

floating

difficult

By

this ar-

holds the

to

Plug-

the

of

grid

Calibrator

The

calibrator imately CAL. OUT. It consists nected two

the ode rests of volts. voltage VOL volts when the red SQUARE-WAVE CALIBRATOR knob turned to the OFF position.

divider

completely or black SQUARE-WAVE CALIBRATOR knob) by another R589-R590. whether the output depending on the position

black knob, nine

volts to 100 volts

l-kc

so

operating

During the negative portion

grid

of

the waveform the

By

can be adjusted

T CHECK jack (cathodel can be

The

Calibrator

for

is

a square-wave generator whose

output

is

available

of a Multivibrator

as

to

switch the cathode

5~ates-cutoff

V555B

is

driven well

at

ground potential. During the positive portion

grid

means

of

the CAL. ADJ. control

C.F.

its cathode resistor. This

partially

The

1000 to 1 ratio

voltage

calibrated

or

millivolts, peak-to-peak, are

at a front-panel jack labeled

V555A-V565, con-

follower

and

conduction.

of

the

Multivibrator

below

rises

to

slightly

so

that the

has

a calibrated, tapped voltage

divider

(depending on the setting of the

of

this

shall be in volts or

of

the red knob.

voltages from

V555B between

waveform,

cutoff and the cath-

less

than + 100

R566,

the

voltage

set

at

the CAL.

to exactly + 100

is

shunted, either

divider

determines

in

By

means of the

.2

volts

available.

millivolts,

approx-

grid

divider

or

milli-

is

to in

is

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4-3

NOTES

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SECTION

c---

MAINTENANCE

5

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PREVENTIVE

MAINTENANCE

Recalibration

The

Type 536 Oscilloscope provide insure the 536, Maintenance Department

(or plete step-by-step procedure the instrument tion

many hours

reliability

we

suggest that its

at

least every six months

of

this manual.

of

is

included in the Recalibration Procedure sec·

is

a stable instrument

trouble-free

measurements

calibration

after

each 500 hours

if

used intermittently). A com-

for

checking the

operation.

obtained

be

checked

and However, on the Type

by

your

of

operation

calibration

will

to

of

Cooling System

The

Type 536

ment

is

equipped structed filter becomes

the instrument to overheat. The and cleaned months.

on a water be coated the Research Products Corp. These products are available

to four months. apply

of

To

remove the loose

hard

and rinsed

The

bearings in the fan

only a drop

Soldering

Many

of mounted on ceramic terminal strips. The notches in these strips are sive heat, the silver-to-ceramic bond. Occasional will

not break the bond

If you are responsible for the maintenance

ber

of

Tektronix instruments, parts changes, stock

of

solder

is

cooled

by

forced, filtered air. The instru-

with a fan

aluminum

or

surface. It should then be washed

with

from

and

the components in your Tektronix instrument

lined or

use

solder containing

used frequently in printed circuitry

wool

dirty,

it

replaced

thoroughly.

"Handi-Coater"

air

conditioner

Use a good

or

two.

Ceramic Strips

with

a silver

of

ordinary

we

recommend that you keep on hand a

and a washable

coated

may

restrict the

if

dirt,

motor

if

excessive heat

with

an adhesive.

flow

of

filter

should be inspected,

necessary, every three to four

the

filter

may

be

After

drying,

or

"Filtercoat"', products

suppliers

should be

grade

of

alloy.

tin-lead solder

or

if

you

about

3%

the filter should

..

oiled

light

machine

Repeated

will

use

of

is

not

of a large

contemplate

silver. This type

air

and

rapped

with

every three

use

break

tin-lead solder

applied.

and

filter

con-

If

the

cause

gently

hot soapy

of

generally

oil,

and

are

of

exces-

down

num-

frequent

of

should be

readily you can pound

it iron when you are installing or removing parts from the strips. Fig. of the building

Fig.

ceramic strips you tained

available

order

rolls.

Because of the shape

is

advisable

the soldering iron.

iron

which

up on rough spots where it

5-1.

Soldering

When

removing

if

you proceed in the manner

I.

Use a soldering

2.

Prepare the tip

3.

Tin

only ing to ceramic terminal strips tin the iron containing

4.

Apply to solder

5.

Apply

6.

Do

not instead, adequately, shown in Fig. 5·3.

from

radio·supply

the solder

Order

by

to

use

5-1

will

show you the correct shape

will

iron

or

will

iron

of

the first

about

one corner

(see

Fig. 5·2).

only

enough heat to make the solder

attempt

to fill the notch on the strip

apply

only

and

directly

Tektronix

of

a wedge-shaped tip on your soldering

Be

be tinned.

tip

properly

replacing components mounted on the

find that satisfactory results are ob-

the iron

1/16

3%

of

to form a slight fillet on the wire

part

the terminals on the ceramic strips

sure

and

file smooth

This

shaped

outlined

of

about

75-watt

as

shown in Fig. 5-1.

to

1/8

inch

silver.

the tip to the notch where you wish

enough solder to cover the wires

houses. If you prefer, from Tektronix in onenumber 251·514.

prevents so'der from

will

and

of

for

the tip

all

surfaces

quickly oxidize.

tinned.

below.

rating.

the tip. For solder-

with

solder

flow

freely.

with

solder;

of

as

I

®®

5-1

Maintenance - Type

Fig.

5-2.

Correct

method

amic

strip.

536

of

applying

heat

in

soldering

to a

cer-

Fig.

5-4.

exaggerated

Soldering

for

clarity-formed

to a terminal.

Note

around

the

slight

wire.

fillet

of

solder-

I

I I I

Fig.

5-3. A slight

heat

is

applied

In

soldering to metal terminals (for example, pins on a tube socketl a slightly ployed. Prepare the iron as outlined ordinary be

soldered as shown in Fig. 5-4. Use

to

allow

a slight fillet

General Soldering Considerations

When

replacing wires in terminal slots clip the ends

as

close to the solder joint as possible.

of wires take care the end removed does not

room

as

it

Occasionally

as

it

is

being soldered. A

a short length of

shown in Fig. 5-5. plastic rods it

to

ovoid

Fig. 5-6) makes a convenient tool for this purpose.

fillet

of

correctly.

tin-lead solder.

the solder to

will

is

clipped.

you

is

melting the plastic. A

solder

different

Apply

flow

be formed

will

wish to

handy

wooden

In

necessary to

dowel,

soldering to terminal pins mounted in

is

formed

around

the

technique should be em-

above,

the iron to the

only

freely

along

the

as

shown in Fig. 5-3.

In

clipping

fly

hold a bore

device for this purpose

with

use

some form

pair

of

long-nosed pliers

wire

one end shaped as

of

wire

when

but tin

enough heat

wire

with

part

so

that

neatly

the ends

across the

in place

"heat

sink"

to

(see

I I

I

Fig.

5-5. A soldering

dowel.

aid

constructed

from a 'I. inch

wooden

I

I I I I

is

I

Fig.

5-6.

of

the

absorb

Soldering

long-nosed

the

heat.

to a pliers

terminal

between

mounted

the

iron

in

plastic.

and

the

Note

the

coil form

use

to

I

5-2

®®

I

Maintenance - Type

536

I I

I

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I

Ceramic Strips

Two distinct types Tektronix instruments. The chassis by means mounted in Fig. 5-7.

a # 2-56 nut so bottom wish to mount the strip the bolts the holes in the chassis placing a sis. ing ends set the second set

with

snap-in, plastic fittings. Both styles

To replace ceramic strips

onto

that the distance between the

of

the ceramic strip equals the

with a drop

#2

Place a second

of

the bolts,

of

#2-56 nllts. Place a

of

#2-56

each

above

of

where

star washer

set

and

of

nuts

after

ceramic strips

earlier

bolts

which

mounting

the chassis. Secure the nuts to

red

glyptal.

the

between

of

#2

flat

fasten them

drop

of

fastening.

have

type

mounted

and

nuts. The

bolt

to the chassis, screw

bolt,

positioning the nut

bottom

original

of

the nut

height

Insert the bolts through

strip was mounted,

each nut

washers on the

firmly

red

glyptal

been used in

later

are

at which you

and

the chas-

with over

Mounting Later Ceramic Strips

To

replace strips which mount first remove the the mounting post on the ceramic strip. Insert the collar

into the mounting post of

the

mounting

on the reverse side

the

original

mounting

into

post

which

of

the chassis.

fittings from the chassis. Assemble

holes in the chassis.

the

nylon

collars. Snip

protrudes

with

snap-in plastic fittings,

Carefully

off

below

the

nylon

the

on the

type

shown

and

the

protrud-

another each

nylon

force

portion

collar

of

is

0''1.

Fig.

5-7.

Two

types

of

ceramic

strip

mountings.

NOTE

Considerable

mounting you

apply

strip

directly

rods

this

force

into

force

above

may

the

be

nylon

to

that

mounting

necessary

collars.

area

of

rods.

to

push

Be sure

the

ceramic

the

that

I I I

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TROUBLESHOOTING

Introduction

This section shooting the Type 536 Oscilloscope. Before troubleshoot apparent oscilloscope, a

faulty Type 536 Operating structions

the

manual

determine

To

units

may

operating

most a ever, should the when the plug-ins

lies

within

Type

536.

of

the

manual

the instrument,

trouble

plug-in

and

for

certainty

is

actually

and

not due to

unit. Instructions

certain types

Instructions section

a specific

for

that specific unit.

that the oscilloscope

be replaced

condition.

one

If the

that the Type 536 itself

trouble

were

of

the

contains

however,

due

improper

of

plug-in

of

type

of

with

others

trouble

appear

replaced, the

original

plug-in units

information

make sure that

to a malfunction

control

for

the

operation

units

this

manual;

plug-in

is

to

unit

is

at

known

still

have

trouble

fault, the

apparent,

is

GENERAL

for

trouble-

attempting

any

within

the

settings

are

operating

will

to be in

at

been corrected,

and

or

of

the

given in the

in-

be

found

plug-in

good

it

is

al-

fault.

How-

most

likely

not in the

PROCEDURE

INFORMATION

Tube Failure

failure

Tube

For this reason, the first step in

to

in

the Type 536 direct

substitution.

quately

within

the instrument. The criterion whether Be

sure to return

inal

socket;

the instrument

servicing.

If

replacement

trouble,

draws

current have not been

sometimes

resistors. These components can ual inspection

are

apparent, urements trouble.

is

to check

indicate

or

then check

the

not it works

if

this

will

overload

of

however,

or

other

the most

any

procedure

of

the circuit.

prevalent

for

Do

not

depend

suitability

satisfactorily

tubes

found

is

be

required

a defective

that

components through which the tube

and

damage

it

will

checks

within

cause

of

troubleshooting

defective

of

followed

damaged.

If

be necessary to make meas-

tubes,

on tube testers to ade-

a tube

for

certain positions

for

usability

within

to be

good

less

upon

completion

tube

does not correct the

Shorted tubes

plate-load

often

be

located

no

damaged

the circuit to locate the

circuit failure.

any

circuit

preferably

of

a tube

the instrument.

to

their

orig-

recalibration

of

the

will

and

cathode

by

a vis-

components

in

by

is

of

5-3

Maintenance - Type

536

Component Numbers

The

component number

tor, vacuum tube, control diagrams. The associated

All 200 numbers All 300 numbers All 500 numbers All

600

All

700

All

800

following

with

each circuit.

numbers

Faulty-Circuit Isolation

Although thought the

Square-Wave

the

Low-Voltage High-Voltage Horizontal

the Type 536

of

as

consisting

Power Supply, the

Power Supply, the Vertical

Amplifier.

of

Calibrator

of

each resistor, inductor, capaci-

and

switch

is

shown on the circuit

chart lists the component numbers

Horizontal Vertical Calibrator Low-Voltage Power Supply Decoupling

In

Units

CRT

is

a complex instrument, it can

four main circuils, in

circuit. These four circuits

Amplifier

Networks

Circuit

CRT

Circuit including the

Amplifier

for Plug-

addition

and

be

10

are

the

The first circuit to check,

ble,

is

the

Low-Voltage configuration an

improper

than the others. For example, Amplifier power-supply

cal

Amplifier.

saved

by

On

the isolate viously exists for

example, when the intensity appear exists in the Vertical vestigated first.

The shooting each circuit defect in the circuit. A method

stances, for

originating;

ent(sl causing the

resistance measurements

certain other instances the the

trouble

employed

power-supply

should change, this could

voltage

In

cases

checking the

other

hand, the crt

trouble

to be

material

to one

in

that circuit. If there

normal,

that follows contains

locating once the stage

trouble

can be traced to a

for

Power Supply. Due to the circuit

in the Type 536, it

voltage

and not to

of

this type

power

supplies first.

display

particular

it

is

apparent

Amplifier

for

troubles that may be caused

the stage in which the

at

can be

or

by

information

particular

practically

to

if

the

any

circuit when

and

is

fault

component substitution.

any

type

is

possible

affect

one circuit more

gain

of

the Vertical

be

due to an

condition in the Verti-

valuable

can often be used to

is

no vertical deflection,

horizontal

that

this circuit should be in-

information

described, in some in-

is

known, the compon-

located

is

component.

time can be

trouble

deflection

an open condition

for trouble-

trouble

by

voltage

more specific and

of

trou-

for

improper

ob-

by

may

be

and

I I

I I I

a

I

In

I

Proper cluding the Lo..--Voltage Power Supply. remain the plug-in units to retain their horizontal-deflection

operation

plug-in

within

Exercise cause Low-Voltage harmful

CRT

any touch possible, sulated

care

of

the

shocks

Circuit.

reason,

the

surface_

of

every circuit in the Type 536, in-

units, depends on

The

their specified tolerances for the instrument

circuits.

CAUTION

in

checking

metal

use

current

If

with

insulated

Power

than

you

frame

capabilities

Supply

the

high-voltage

reach

the

power

tools

proper

regulated

calibration

the

power

can

into

turned

with

the

and

of

the

Open Power Circuit (Dead Circuit)

If the

pilot

lamp

and the fan

instrument power instrument. If the fuse proper fuse blows shorted shorted

is

turned on, check the source

cord connections. Check the

value

and

turn the instrument on

immediately,

primary

power

and

supply rectifiers. If a new fuse does not

is

secondary windings. Also check for

do

blown,

check the

replace it

not come

fuse

power

LOW-VOLTAGE

operation

dc

voltages must

in the vertical-

supply.

the

circuit,

produce

supply

instrument

on,

other

stand

on

of

power

at

the rear

with

again.

transformer for

in

do

hand.

an

on

when the

one If the

of

Be-

the

more

the

for

not

in-

and

of of

the

and

If

the the the

new.

POWER

blow can be heard), check for a shorted

lator

the volt the resistance ment even though the Thermal mal Cutout switch ment near the fan

circuit

Incorrect Output

at coded wires. The and brown,

350-volt bus

check ulate between 105

center

SUPPLY

until the time-delay relay has

circuits

If the fuse

power

operation,

is

If both the fan and the

of

wired

the

and

the

is

good,

transformer.

check

of

this switch

for

115-volt

is and

power

transformer

loading

check

If

your

for

an open Thermal Cutout switch;

Cutout

located

the

pilot

Voltage

The

regulated

the points indicated in Fig. 5-8,

brown

black

is

coded red, red

wire.

If

any

of

is

the line

115 volts,

at

supply voltages,

-150-volt

on a black wire; the + 1DO-volt

and

brown

on a

and

brown

is

coded orange, green

the supplies

voltage.

or

between 210

234 volts,

fail

The supplies are designed to reg-

and

125 valts

rms.

for

operation

power

and

activated,

condition

on the supply.

an open

instrument

is

about

.1

the fan

may be open). The Ther-

toward

white

transformer.

lamp

is

operating

which

bus

on a

to

regulate

with

250 volts

the rear

come on the

are

is

coded

wire; white

and

in the regu-

primary

is

wired

n.

(If

will

of

normally.

may be measured

identified

brown,

bus

the

+225-volt

wire;

brown

the first thing to

the design center

with

(a

"click"

winding

for

234-

your

instru-

come on

the instru-

primary

by

colorgreen

is

coded

and

the +

on a

white

the design

in

bus

at

I I I I I I I I

I I

5-4

®®I

I

I I I I

Maintenance - Type

536

I

I I

I

Fig.

5-8.

If the line remove the plug-in units each bus

should measure

measure measure

If the resistance values between the regulated ground check out, the next step has

not voltage or 234 winding each secondary center ondary operation done regulator. These values are also diagram. Then check for off-va I

The material that follows may be used

for

troubleshooting.

voltage

of

the regulated buses and ground. The

about

already

is

set to the design center

v)

and

of

the

voltage

voltages are all correct, the next step

of

the

by

measuring the rectified

ue

is

the correct value, the next step

and

measure the resistance between

about

20,000 ohms, the + 100-volt bus

about

650 ohms, the

15,000 ohms,

23,000 ohms,

been done). Then make sure that the line

check the

power

voltage

is

indicated on the circuit

power

resistors, especially

and

all

to ground.

rms

voltage

transformer; the nominal value

when the line

supply rectifiers.

for

open

+225-volt

the

+350-volt

is

to check the tubes (if this

for

your

across each secondary

is

voltage

indicated

or

leaky capacitors, and

in

the dividers.

diagram.

This

at

Voltage

check

points

is

to

-150-volt

bus should bus should

"~

buses

and

instrument (115 v

of

set to the design

If the

sec-

is

to check the

can be easily

the input to each

on the circuit

as

a quick index

for

Low-Voltage

If the output

a. For high line voltage. b.

c.

If the output

a. For proper resistance values

If the

a. b.

c.

d. e. If the outpur a. b.

Power

Supply.

voltage

The

Amplifier

V696. For insufficient loading.

R615,

R648

and

R698).

output

For

low

The Series tubes V607, V617, V637 and V687.

For excessive

Open

or

Defective rectifiers.

The resistance values

The capacitors across the dividers.

tubes V606, V634, V646, V656, V674 and

voltage

and

R649,

voltage

line voltage.

loading.

leaky

filter

voltage

is

high with excessive ripple, check:

is

high with normal ripple, check:

in

the dividers

R663

and

R664,

is

low

with excessive ripple, check:

capacitors.

is

low

wirh normal ripple, check:

in

the dividers.

and

(R614

R696,

and

R697

I

®®:I

5-5

Maintenance - Type

The

intensity, focus,

display depend on the

CRT

supply in the

Circuit.

536

geometry proper

operation

and

calibration

of

the high-voltage

of

CRT

the crt

I

CIRCUIT

I I

Incorrect

If no high from any should be checked first. The checked first. The removing the shield from the high-voltage supply a neon shown in Fig. 5-9. If the field this case, the trouble windings. It be defective.

Do when

an

ful

If the neon of placement (V80a, V8l6) does not correct the trouble, then check the components associated with this circuit, including the primary and secondary

If the correct output one not be checked. and components associated

If the high by should be checked. circuit ADJ. control

No

If the power supply voltages are normal, but no spot trace crt, a defect in

either case, the voltages and the beam

To ING of plate (at the neck pins)

Output Voltage

voltage

of

lamp

of

T80l, the

not

let

making

otherwise

injury.

T80l, the

of

the

high-voltage

decreased deflection sensitivity, the

is

changed you should check the setti

Spot

or

is

visible on the crt, the trouble could be a defective

or

de

determine which circuit

control on each plug-in unit to the

its range.

(or insufficient high voltage)

the three supplies, the

operation

in the field

Oscillator

is

unlikely that

your

hand

this

harmless

lamp

does not

Oscillator

In

this case you can check the rectifier tube

voltage

R8ll.

Trace

in

the crt circuit,

both

of

unbalance

Then

measure the

of

lamp

circuit

would

probably

CAUTION

or

check.

shock

circuit

of

voltage

supplies, the

with

appears

If

this tube or any component in the

Visible

the deflection amplifiers.

is

producing

is

being deflected

with

Oscillator

of

this circuit can be

this circuit can be checked by

high-voltage transformer,

glows, when placed in the

is

operating be defective secondary

all

three rectifier tubes

body

touch

the

Secondary

might

glow

when placed

is

inoperative. If tube re-

the transformer.

is

obtained from

the inoperative supply

to

be

on

CRT

or

an unbalanced

;s

at

fault,

voltage

respect to ground. If the de-

reactions

result

Oscillator

too

high,

regulator

improper

off

the screen.

set

approximate

at

each deflection

circuit (V800)

and

properly.

instrument

in a

as

ng

In

the POSITION-

is

available

holding

as

would

to

pain-

in

the field

at

least

circuit need

(s).

evidenced

circuit

V8l6

of

the

H.

de

condition

the latter

positioning

center

In

V.

or

Fig.

5-9.

high-voltage

flection amplifiers are in balance, these voltages about POSITIONING of amplifier to following

exists somewhere within the crt circuit; it may possibly be the crt itself. Check the continuity check especially to the ASTIGMATISM control crt base;

crt. Check the INTENSITY control circuit; this control should

vary

volts and your voltmeter).

check

check the neck pin on the crt).

Using a neon

transformer.

+250

volts

deflection plates measures more than

driving

deflect the beam

section on troubleshooting the deflection ampl ifiers.

If the deflection voltages

if

this circuit

the

voltage

about

If the crt circuit appears to be

for

a defective crt,

badly

(If a

GEOM.

lamp

to

check

for

energy

±25

volts, depending on the setting

controls. If the

those plates

off

the screen.

see

that

is

open no trace

at

the

grid

-900

volts (be sure to observe

preferably

distorted spot

ADJ. control and its connection

voltage

is

out

of

In

appear

and

to be normal, the

of

R856

is

the

lead

of

the crt between

operating

by

or

trace

between either about

de

this event refer

the cathode circuit;

not

will

substitution.

is

in

the

field

of

the

should

50

balance sufficient

open. Also check

connecting

be visible on the

about

normally, then

visible on the crt,

of

volts, the

to

trouble

to

-800

polarity

to

read

the

set

the

on

the

I

I I I I I I I

I

The

material that follows describes a method for trouble--

shooting the deflection amplifiers

two amplifiers are almost identical, this

applicable

to either.

in

the Type 536. Since the

material

5-6

DEFLECTION

will

be

AMPLIFIERS

No

Spot

or

Trace

Visible

For the trace to be visible on the crt, the de

tween the deflection plates (either Vertical

on

CRT

voltage

or

Horizontall

I

be-

I