Tektronix 524AD series Bedienungsanleitung

CATHODE-RAY

OSCILLOSCOPE

TYPE

S24AD

INSTRUCTION

MANUAL

TEKTRONIX, INC.

MANUFACTURERS

OF

CATHODE-RAY

AND

VIDEO

TEST

INSTRUMENTS

Sunset

Highway

and Barnes Road •

P.

0,

Box 831 • Portland

7,

Oregon,

U.S.

A.

Phone: CYpress

2-2611

• Cables:

Tektronix

TYPE

524AD

SERIAL

NUMBER

---

TYPE

S24AO

CATHOOE-tAY OSClllOSCOPf

•

B

GENERAL DESCRIPTION

General

The

'fektronix

Type

524AD is a

portable,

self-

contained

cathode-ray

oscilloscope specifically

designed

for

maintenance

and

adjustment

of

tele-

vision

transmitters

and

studio

equipment.

With

this

oscilloscope,

any

portion

of

the

tele-

vision

picture

can

be

observed,

from

complete

frames

to

small

portions

of

individual lines.

Any

one

of

the

525 lines in

the

picture

can

be

select-

ed

and

observed

in detail.

Internally-generated

time

markers

facilitate

sync-pulse

timing.

The

wide-band

vertical

amplifier

is

provided

with

a

network

that

can

be

switched

in

to

limit

the

high-frequency

response

to

that

recommended

by

the

IRE

Standards

Committee

for

stand-

ardized

pulse-level

measurements.

A second

switch

position

adds

high-frequency

compensa-

tion

to

make

flat

frequency

response

to

5 me,

within

one

per

cent,

but

at

the

sacrifice

of

best

transient

response.

The

vertical

amplifier

has

a

bandwidth

to

10

megacycles, a

de

sensitivity

to

0.15

volts

per

centimeter,

and

an

ac

sensitivity

increased

by

a

lOX ac-coupled

preamplifier

to

0.015

volts

per

centimeter.

A built-in

variable-duty-cycle

cali-

brator

aids

in pulse-level

measurements.

The

sweep

system

provides

calibrated

sweeps

as

fast

as

0.1

microsecond

per

centimeter,

in-

cludes a

3X

and

lOX magnifier, a television

composite-video-signal

sync

separator,

and

a

variable

delayed

sweep.

The

unblanking

pulse

is

de

coupled.

Characteristics

SWEEP

CIRCUIT

Hard-tube

type,

triggered

or

recurrent

opera-

tion

as

desired.

SWEEP-TIME

RANGE

Continuously

variable,

0.1

microsecond

per

centimeter

to

0.01

second

per

centimeter.

TRIGGER

REQUIREMENTS

TV

composite

video

signal

between

0.5

volt

and

15

volt

peak,

or

pulses 0.15

to

15

volts

peak

to

peak.

SWEEP

MAGNIFICATION

Magnifier

expands

the

trace

to

right

and

left

of

center,

either

3X

or

lOX. Magnified

sweep

speed limited

to

0.1

microsecond

per

centimeter.

EXTERNAL

SWEEP

INPUT

External

sweep

voltage

can

be

coupled

in via

100-k

potentiometer

through

de-coupled

sweep

amplifier,

with

magnification, if desired.

Hori-

zontal

positioning

included.

SINE-WAVE,

60-CYCLE

PHASED

SWEEP

This

sine-wave

sweep

is

adjustable

in ampli-

tude

and

the

phase

can

be varied

through

150

degrees. Applied via

the

sweep

amplifier.

In-

cludes

sweep-magnifier

and

horizontal-position-

ing

circuits.

TIME

MARKERS

Five

time

intervals

are

provided

of

1 µsec,

0.1

µsec, 0.05 µsec, 0.318 µsec

and

1.59 µsec. (200

markers

and

40

markers

per

television line.)

DC

UNBLANKING

The

de-coupled

unblanking

pulse

permits

the

slowest

sweeps

to

be used

with

uniform

spot

intensity

throughout

the

sweep.

VERTICAL

AMPLIFIER

Four

de-coupled

stages

provide

sensitivities

from

0.15

volts

per

centimeter.

Output

stage

is a

three-section

push-pull

distributed

amplifier.

An

ac-coupled lOX

preamplifier

can

be

switched

in for

highest

sensitivity,

giving

a sensitivity

of

0.015

volts

per

centimeter.

AC

VERTICAL-DEFLECTION

SENSITIVITY

Continuously

variable

from

0.015

volts

per

centimeter

to

50

volts

per

centimeter,

peak

to

peak.

DC

VERTICAL-DEFLECTION

SENSITIVITY

Continuously

variable

from

0.15

volts

per

centimeter

to

50

volts

per

centimeter,

peak

to

peak.

VERTICAL-AMPLIFIER

FREQUENCY

RESPONSE

DC

to

10

megacycles

at

a

maximum

sensitivity

of

0.15

volts

per

centimeter.

Two

cycles

to

10

megacycles

with

the

ac-coupled

preamplifier

for

sensitivity

increased

to

0.015

volts

per

centi-

meter.

@

GENERAL

DESCRIPTION

-

PAGE

1

TYPE

624AD

Over-compensation

of

high

frequencies

can

be

selected

with

a

switch

to

provide

flat

frequency

response,

within

I

per

cent,

to

5 me,

bnt

with

some

overshoot

on

transient

response.

VERTICAL-AMPLIFIER

TRANSIF.NT

RESPONSE

Rise

time

0.04

microseconds

between

response

points

10

per

cent

and

90

per

cent

of

the

final

value.

VERTICAL-AMPLIFIER

INPUT

IMPEDANCE

One

megohm

shunted

by

45

µµf

capacitance.

PROBE

INPUT

IMPEDANCE

Ten

megohms

shunted

by

15

µµf;

!OX

attenua-

tion.

SIGNAL-DELAY

NETWORK

A <lelay

network

supplies

an

additional

0.25

microsecond

of

delay

to

the

vertical-ampli-

fier

system

to

permit

the

triggering

waveform

to

he

displayed.

Total

signal

delay

is

0.34

micro-

seconds.

CALIBRATOR

A

variable-duty-cycle

square

wave

is

provided.

Seven

full-scale

ranges

between

0.05

volts

and

SO

volts,

continuously

variable,

can

be

read

di-

@

rcctly

from

the

dial

settings

with

an

accuracy

within

three

per

cent

of

full scale.

The

duty

cycle is

variable

between

I

per

cent

and

99

per

cent.

Frequency

varies

with

duty

cycle.

CATHODE-RAY

TUBE

A

type

5ABP1

cathode-ray

tube

is

supplied

with

the

Type

524AD

unless

a P7

or

a

Pll

is

specified

as

the

optional

choice.

CATJIODE-RAY

Tum;

ACCELERATING

VOLTAGE

Four

kilovolts.

(-+·2.5

and

-1.5

kv.)

CONSTRUCTION

Welded

aluminum

alloy, with

photo-etched

panel

and

blue

wrinkle

case.

DIMENSIONS

25"

long, 13" wide, 16¼" high.

\VEIGHT

61

pounds.

POWER

REQUIREMENTS

105

to

125

volts

or

210

to

250

volts

ac,

SO

to

60 cycles. 500

watts

at

117

or

234 volts.

TYPE

524AD

GENERAL

DESCRIPTION-

PAGE 2 ®

VOLTS/CM

INPUT

SELECTOR

INPUT

1,

INPUT

2

GND

VARIABLE

ATTEN.

CAL.

VOLT-

AGE RANGE

VARIABLE

ATTEN.

BAL.

CAL.DUTY

CYCLE

CAL.

VOLTAGE

CAL.OUTPUT

PROBE

POWER

SCALE

ILLUMINA-

TION

FOCUS

INTENSITY

ASTIGMATISM

VERTICAL

POSITION

®

Front-Panel

Controls

and

Connectors

VERTICAL

AMPLIFIER

Seven-position

gang

switch. Selects

attenuators

or

preamplifier

at

the

input

to

the

vertical

amplifier

to

select

vertical-deflection

sensitivity.

Six-position

switch

connects

INPUT

1,

INPUT

2,

or

the

calibrator

output

to

the

vertical

amplifier,

and

inserts

or

removes

a

capacitor

for ac

or

de coupling.

Coaxial

connectors

to

the

vertical-amplifier

system

via

the

INPUT

SELECTOR

switch.

Binding

post

connected

to

the

instrument

case.

Variable

resistor

between

cathodes

of

the

cathode-coupled

variable-gain

stage.

Varying

this

resistor

varies

the

coupling

between

stages

and

varies

the

overall

stage

gain.

Eight-position

switch

selects

attenuators

providing

seven

calibrator

voltage

ranges,

and

turns

the

calibrator

off.

Adjusts

grid

bias

of vertical

variable-gain

stage.

When

the

two

cathodes

of

this

cathode-coupled

stage

are

at

equal

voltage,

no

vertical

positioning

occurs

when

the

VARIABLE

ATTEN.

control

is

adjusted.

Variable

resistor

adjusting

time

constants

of

calibrator

multivibrator.

Time

con-

stant

of

one-half

of

multivibrator

is

lengthened

while time

constant

of

other

is

shortened.

Permits

duty

cycle

to

be

varied

between

one

per

cent

and

99

per

cent

limits.

Calibrated

potentiometer

across

the

CAL VOLTAGE RANGE

step-attenuator

output.

Gives

continuously

variable

voltage

within

the

step

range.

Coaxial

connector

from

arm

of

CAL VOLTAGE

potentiometer.

Provides

the

same

voltage

as

is applied

to

vertical amplifier input.

Connector

to

provide

plate

and

filament

power

for a

cathode-follower

probe.

CRT

CONTROLS

Potentiometer

in

the

graticule

light

circuit

to

vary

brightness

of

scale illumination.

Potentiometer

varying

the

voltage

of

the

focusing

anode

of

the

cathode-ray

tube.

Potentiometer

adjusting

the

control-grid

bias

on

cathode-ray

tube

to

adjust

spot

intensity.

Potentiometer

adjusting

the

grid

bias

of a

cathode-follower

voltage

regulator

supplying

astigmatism-grid

voltage

on

cathode-ray

tube.

Potentiometer

setting

the

grid

voltage

of

one-half

of

the

phase-inverter

amplifier

stage.

Since

the

amplifier is de coupled,

variation

of

the

de level

at

this

stage

varies

the

average

de

voltage

between

the

vertical-deflection

plates.

@

GENERAL

DESCRIPTION

-

PAGE

3

TYPE

524AD

HORIZONTAL

POSITION

EXT

MARKER

(CRT

CATH)

Time

Marker

Switch

PHASE

AMPLITUDE

+GATE

-GATE

MAG.

POS.

µSEC/CM

MULTIPLIER

SWEEP

DELAY

SWEEP

OUTPUT

FIELD

SHIFT

EXTERNAL

SWEEP

INPUT

@

TYPE

524AD

Pocentiometer

setting

bias

of

first sweep-amplifier V218A. Since

sweep

amplifier

is de coupled,

change

in de level

at

this

point

affects

average

voltage

between

horizontal-deflection plates.

TIME

MARKER

Front-panel

connector

connected

through

the

EXT

position of

the

time

marker

switch

and

through

a .015-µf

capacitor

to

the

cathode-ray

tube

cathode.

Six-position

gang

switch

selects circuit

constants

for

time-mark

time

intervals

and

connects

marker

to

cathode-ray

tube

cathode

circuit in five

of

the

six switch

positions.

In

sixth

position

switch

turns

off

time-marker

generator

and

connects

cathode-ray

tube

cathode

to

external

binding

post.

Control

to

delay

the

start

of

the

markers

up

to

1.5

µsec.

Variable

resistor

setting

bias

of

clipper amplifier

and

thereby

setting

amplitude

of

marker

pips.

SWEEP

GENERATOR

Front-panel

binding

post

to

cathode

of

gate-output

amplifier. Peak

voltage

about

30

volts

de coupled

to

binding

post.

Front-panel

binding

post

to

plate

of

gate-output

amplifier

through

0.047-µf capaci-

tor.

Peak

voltage

about

30 volts.

Screwdriver

front-panel

control

adjusts

bias

of

phase-inverter

sweep-amplifier

stage

to

permit

adjustment

fo magnified-sweep position

so

that

the

magnified

sweep

centers

at

the

center

of

the

screen.

Ganged

variable

resistors

in

timing-capacitor

charging

circuit

and

multivibrator-

timing

circuit.

Units

dial

controls

ten-position

gang

switch

increasing

resistance

by

equal

increments

in

both

timing-capacitor

circuit

and

multivibrator-timing

circuit.

Tenths

dial

controls

dual variable

resistors

in series

with

step

resistors.

Dial

is calibrated in

conjunction

with

variable resistors.

Sum

of

units-dial read-

ing

and

tenths-dial

reading

gives sweep-time

multiplying

factor.

Three-tum

potentiometer

setting

grid

bias

of

voltage-comparator

tube.

Deter-

mines

point

on

triggered

sawtooth

at

which delayed

trigger

voltage

is

generated.

Triggered

sawtooth

has

maximum

repetition

rate

of

30

per

second.

Permits

trig-

gering

sweep

on

any

line

of

television field.

Front-panel

connector

from

cathode-follower

amplifier provides a positive-going

sawtooth

voltage

simultaneously

with

the

sweep.

Fixed

peak

voltage

of

about

40 volts, de coupled

to

binding

post.

Extends

duration

of

one

delay-timing

sawtooth

so

that

an

extra

vertical sync

pulse is missed,

and

sawtooth

thereafter

synchronizes

with

alternate

field.

External

front-panel connection

to

the

sweep amplifier, de coupled

to

amplifier

through

EXT

SWEEP

ATTEN

potentiometer.

GENERAL

DESCRIPTION

-

PAGE

4

TIME

STABILITY

(EXT.

SWEEP

ATTEN.)

AMPLITUDE

(INT

60'v

SWEEP

PHASE)

SELECTOR

EXTERNAL

TRIGGER

INPUT

POWER

Seven-position

ganged

switch.

Selects

five sizes

of

timing

capacitors

in

sweep

circuit

and

corresponding

five sizes of

capacitors

in

multivibrator

timing

circuit.

In

remaining

two

positons,

connects

EXTERNAL

SWEEP

INPUT

connector

or

internally-developed

60-cycle

sine

wave

to

sweep

amplifier,

and

biases

gating

multivibrator

off

to

unblank

cathode-ray

tube.

Ganged

dual

potentiometer.

Adjusts

bias

on

gating

multivibrator

in

region

of

bias

for

recurrent

operation.

Second

potentiometer

provides

amplitude

adjustment

for

external

sweeps.

TRIGGER

Potentiometer

setting

bias

on

trigger-amplifier

tube

to

adjust

gain

and

operating

point.

Ganged

with

variable

resistor

in 60-cycle

phasing

circuit

which

varies

phase

of

sine-wave

sweep

when

SWEEP

TIME

switch

is

in

INTERNAL

60'v

SWEEP

position.

Ten-position

switch

selects

various

sources

of

trigger

voltage

and

arranges

trig-

ger-amplifier

output

circuit

to

maintain

positive

trigger

output

for

either

polarity

of

input

pulse.

In

the

UNDELA

YED

SWEEP

positions,

output

of

the

trigger-

phase

changer

is applied

to

sweep

circuit directly.

In

the

DELAYED

SWEEP

positions

marked

in

red

on

the

panel,

input

triggers

pass

through

a

sync

separator

and

are

arranged

to

trigger

a

sawtooth

generator

which

produces

a

second

trig-

ger

delayed

by

an

adjustable

time

after

the

first

trigger.

Coaxial

connector

to

EXT

position

of

trigger

SELECTOR

switch.

Toggle

switch

in

primary

circuit

of

power

transformer.

@

GENERAL

DESCRIPTION

-

PAGE

6

TYPE

524AU

OPERATING

INSTRUCTIONS

Preliminary

Instructions

COOLING

The

Type

524AD Oscilloscope is cooled

by

filtered,

forced-air

ventilation.

The

instrument

must

therefore

be

placed

so

the

air

intake

is

not

blocked,

and

the

filter

must

be

clean

enough

to

permit

adequate

air

circulation.

If

the

interior

temperature

does rise

too

high

for

some

reason,

a

thermal

cutout

switch

will

disconnect

the

pow-

er

and

keep

it

disconnected

until

the

temperature

drops

back

to

a safe value.

Keep

the

instrument

dry.

If

is it

exposed

to

excessive

dampness,

let it

dry

thoroughly

before

operating

it.

CATHODE-RAY

TUBE

CONTROLS

The

Type

SABP

cathode-ray

tube

used in

this

instrument

has

a

total

deflection

potential

of

about

4000 volts.

With

this

amount

of accel-

eration,

the

spot

can

be

bright

enough

to

dam-

age

the

screen

if it is left

long

in

one

place. Be

careful

to

turn

the

INTENSITY

control

to

the

left

so

that

the

spot

is dim

whenever

you

leave

the

instrument

unattended.

Individual

FOCUS, ASTIGMATISM,

and

INTENSITY

controls

are

available

on

the

front

panel.

These

controls

are

slightly

interdepen-

dent,

and

may

require

readjustment

for

different

INTENSITY

control

settings.

ILLUMINATED

GRATICULE

The

adjustable

graticule

lighting

control

la-

beled SCALE ILLUM.,

can

be

adjusted

to

suit

the

lighting

conditions

of

the

room.

The

colored

filter supplied is colored

to

provide

the

maxi-

mum

trace

contrast

for

the

Pl

phosphor

in

the

presence

of

room

light.

The

graticule

is

accurately

scribed

in

centi-

meters,

and

the

sweep

times

and

vertical-de-

flection

factors

are

given in

units

per

centimeter.

To

find

volts

from

the

amplitude

of deflection,

therefore,

multiply

centimeters

of

deflection

from

the

graticule

reading

by

the

volts

per

centi-

meter

indicated

by

the

vertical-amplifier dial

settings.

Similarly,

to

find time,

multiply

centi-

meters

along

the

time axis

of

the

graticule

by

the

sweep time

per

centimeter

indicated

by

the

sweep-dial

settings.

The

graticule

can

be

mounted

in

either

of

two

positions,

rotated

180

degrees

from

each

other.

In

one

position,

the

graticule

illumination

is

colored red,

and

in

the

other

position it is white.

The

red

contrasts

well

with

the

green

filter.

The

white is

more

satisfactory

photographically.

First Time Operation

To

place

the

Type

524AD in

operation

for

the

first time,

the

following

procedure

is

sug-

gested:

I.

Connect

to

a

source

of

50-60 cycle, 105-

125

v

power

(or

210-250 v if T401

primary

connections

have

been

changed

accord-

ing

to

the

directions

shown

in

the

Adjust-

ment

Section

of

this

manual).

2.

Set

controls

as

indicated below.

INPUT

SELECTOR CAL.,

AC

VOLTS/CM

15-50

VARIABLE

ATTEN.

Clockwise

CAL. VOLTAGE RANGE

50

CAL.

DUTY

CYCLE

Mid

range

CAL.VOLTAGE

0

SELECTOR

+SIG,

UNDELAYED

SWEEP

AMPLITUDE

Counterclockwise

STABILITY

Counterclockwise

TIME

100

µsec/cm

TIME

MULTIPLIER

5.0

MAGNIFIER

OFF

TIME

MARKER

EXT

3.

Turn

POWER

switch

to

ON

and

wait

about

60 seconds.

4.

Set

INTENSITY

control

at

about

¼

clockwise rotation.

5.

Adjust

VERTICAL

POSITION,

HORI-

ZONTAL

POSITION,

ASTIGMA-

TISM,

and

FOCUS

until

a

sharply

fo-

cussed

spot

is

obtained

at

the

left

center

of

the

screen.

CAUTION

-

DO

NOT

ALLOW

THIS

SPOT

TO

BE

EXCES-

SIVELY

BRIGHT

OR

REMAIN

FOR

LONG

IN

ONE

POSI-

TION.

@

OPERATING

INSTRUCTIONS-

PAGE

1

'l'YPE

524AlJ

6.

Advance

the

sweep

ST

ABILITY

con-

trol

until a

sweep

appears,

then

turn

it

back

until

the

sweep

just

disappears.

7.

Set

the

CAL.

VOLTAGE

control

to

5

(50

v).

8.

Advance

the

trigger

AMPLITUDE

con-

trol

to

obtain

a

stable

trace

of

a

square

wave

(about

3½

cm

vertical

deflection).

The

oscilloscope is

now

displaying

the

square-

wave

calibrating

voltage.

To

observe

other

waveforms,

connect

to

either

INPUT

1

or

IN-

PUT

2

and

set

the

INPUT

SELECTOR ac-

cordingly.

Adjust

the

VOL

TS/CM

and

VARI-

ABLE

ATTEN

for

the

desired

amount

of

verti-

cal deflection,

and

then

select

the

appropriate

sweep

time

by

means

of

the

sweep

TIME

and

µSEC/CM

MULTIPLIER

controls.

Sweep Operation

GENERAL

The

sweep

circuit

of

the

Type

524AD

is

very

flexible

and

is

capable

of

synchronizing

at

high

frequencies.

Fundamental

frequencies

as

high

as

10

me

can

be

observed

easily.

By

adjusting

the

sweep

STABILITY

control,

the

sweep

can

be

made

to

run

recurrently

or

triggered

as

de•

sired.

ADJUSTMENT

OF

SWEEP

STABILITY

The

sweep

STABILITY

control

varies

the

multivibrator

bias

and

therefore

determines

whether

the

sweep

will

operate

recurrently

or

wait

for

a

trigger

impulse.

Correct

functioning

for

triggered

operation

is

therefore

obtained

when

the

STABILITY

control

is

set

just

under

the

point

where

oscillation

takes

place.

The

pro-

cedure

is

to

remove

the

trigger

source

by

turn-

ing

the

trigger

AMPLITUDE

control

counter-

clockwise,

advance

the

STABILITY

knob

until

a

sweep

appears,

and

then

decrease

it until it

just

disappears.

NOTE-

When

using

the

internal

(

+SIG.

or

-SIG.)

trigger

impulses

to

view

signals

at

fundamental

fre-

quencies

of

about

2

me

or

higher,

it

will

be

necessary

to

advance

the

STABILITY

control

somewhat

above

the

normal

operating

point

to

secure

a

stable

pattern.

The

µSEC/CM

MULTIPLIER

dials

also

may

have

some

effect up-

on

the

critical bias

for

triggered

op-

eration

of

the

multivibrator.

The

STABILITY

control

may

need

to

be

readjusted

when

the

MULTI-

PLIER

dials

are

changed.

FUNCTION

OF TRIGGER SELECTOR

This

control

selects

the

trigger

impulses

to

be

used

from

three

sources:

the

line

frequency

(601\/),

the

vertical

amplifier

(+SIG.

or

-SIG.)

and

the

EXTERNAL

TRIGGER

INPUT

coax

connector.

The

trigger

SELECTOR

switch

is

divided

into

two

sectors

of

rotation.

One

sector,

marked

in black,

provides

positions

for all

types

of

trigger

signals

without

the

delayed-trigger

cir-

cuit.

The

other

sector

provides

the

same

posi-

tions

as

the

first sector,

but

includes

the

delayed

trigger

circuits.

When

using

those

marked

(+

),

the

sweep

starts

during

the

rising

portion

of

the

trigger

impluse.

When

using

the

positions

marked

(-),

the

sweeps

start

during

the

falling

protion.

For

satisfactory

operation

in

the

EXT

positions,

trigger

amplitudes

between

.5

volts

and

15

volts

peak

should

be

provided.

Larger

trigger

voltages

should

be

attenuated

externally.

ADJUSTMENT

OF TRIGGER

AMPLITUDE

The

trigger

AMPLITUDE

control

sets

the

bias in

the

trigger

amplifier

and

thereby

adjusts

the

amplitude

of

the

impulse

which

reaches

the

multivibrator.

After

the

sweep

STABILITY

is

set as

described

previously,

and

the

trigger

SE-

LECTOR

switch

is

set

to

the

correct

position,

advance

the

trigger

AMPLITUDE

control

until

a

stable

trace

is

obtained.

When

the

trigger

source

is a

slowly

changing

wave

such

as a sine

wave

or

sawtooth,

adjustment

of

the

AMPLI-

TUDE

setting

will

change

the

phase

of

the

sig-

nal relative

to

the

start

of

the

sweep.

In

general, it is

desirable

to

use

the

minimum

AMPLITUDE

setting

required

to

insure

a

stable

trace.

If

poor

synchronizing

is

experienced

when

the

Type

524AD is

used

to

observe

repetitive

signals

containing

erratic

peak

voltages,

such

as

are

produced

by

vibrating

contacts,

it

may

be possible

to

form

a

stabilized

trigger

signal

by

the

use of

auxiliary

limiting

and

differentiat-

ing

circuits.

The

trigger

SELECTOR

switch

should

then

be

set

to

the

proper

EXT

polarity,

and

connection

should

be

made

to

the

EXTER-

NAL TRIGGER

INPUT

connector.

ADJUSTMENT

OF

SWEEP

TIME

The

combination

of

sweep

TIME

and

µSEC/CM

MULTIPLIER

controls

allows

the

operator

to

vary

the

sweep

time

so

that

the

marked

portion

of

the

graticule

(

10

cm)

is cov-

ered

in

any

time

from

.1

sec

to

1 microsec.

The

approximate

number

of

microseconds

for

a

horizontal

deflection of 1

cm

can

be

determined

easily

by

multiplying

the

TIME

setting

by

the

sum

of

the

MULTIPLIER

dial

readings.

Mul-

tiply

this

figure

by

ten

to

determine

the

time

required

to

sweep

the

entire

10-cm

portion

of

the

graticule

which

is

calibrated

in

centimeters.

TYPE

524AD

OPERATING

INSTRUCTIONS-PAGE

2

®1

The

MULTIPLIER

consists

of

a 10-step

con-

trol

and

a

continuously

variable

control,

with

the

step-control

dial

numbers

serving

as

indices

for

the

hand-calibrated

variable

dial.

These

dial

readings

are

added

to

determine

the

multi-

plying

number.

Since

100 dial

divisions

are

pro-

vided

for

each

10-to-1

TIME

range,

accurate

indication

and

precise

resetting

are

made

pos-

sible.

The

overall

accuracy

of

the

sweep-time

cali-

bration

is

dependent

on

several

factors,

includ-

ing

linearity

of

the

sweep

amplifier

and

the

cathode-ray

tube,

but

the

actual

time

for

a

10-cm

sweep

will

be

within

five

per

cent

of

the

indicated

time

at

any

setting

of

the

controls.

Compensation

for

variations

caused

by

different

tubes, etc.,

can

be

made

by

means

of

screwdriver

adjustments

inside

the

case.

Procedure

for

these

adjustments

will be

found

in

the

Main-

tenance

section.

RECURRENT

SWEEP

Jn

case

it is

desirable

to

have

a

sweep

without

using

any

sort

of

trigger,

retard

the

trigger

AMPLITUDE

control

and

advance

the

sweep

STABILITY

control

until

a

stable

repetitive

sweep

is

obtained.

SINGLE

SWEEP

The

triggered

sweep

circuit

used

in

the

Type

524AD

inherently

provides

for

single-

sweep

operation.

The

beam

is

blanked

out

until

the

trigger

simultaneously

turns

it

on

and

starts

the

sweep.

For

single-sweep

operation,

a

me-

chanical

contact

or

hand

key

can

be

connected

between

the

EXTERNAL

TRIGGER

INPUT

connector

and

ground,

with

the

trigger

SELEC-

TOR

switch

at

-EXT.

If

multiple

sweeps

occur

because

of

intermittent

or

bouncing

contact,

a

capacitor

of

.1

µf

to

1 µf

should

be

connected

across

the

contact.

This

capacitor

will

charge

to-

ward

about

10

volts

through

1

megohm

and

the

long

time

constant

will

prevent

an

immediate

re-

currence

of

the

sweep.

Use

minimum

dependable

trigger

AMPLITUDE

setting.

SWEEP

DELAY

The

SWEEP

DELAY

control

will

produce

triggers

no

faster

than

30

times

per

second.

This

control

adjusts

the

amount

of

delay

between

receipt

of

the

trigger

and

the

start

of

the

sweep.

The

delay

circuit

operates

only

when

the

trigger

SELECTOR

switch

is in

the

DELAYED

SWEEP

sector.

The

panel

markings

give

an

approximate

indication

of

the

delay.

When

a

composite

television

signal

enters

the

sweep-delay

circuitry

a

sync

separator

ex-

tracts

the

60-cycle

field-sync

pulse.

The

sweep

delay,

operating

30

times

per

second,

accepts

every

other

vertical-sync

pulse

and

starts

the

sweep

from

zero

milliseconds

to

25

milliseconds

after

the

accepted

sync

pulse.

This

amount

of

delay

allows

the

sweep

to

display

any

of

the

lines in

one

field.

FIELD

SHIFT

When

the

FIELD

SHIFT

button

is

depress-

ed,

the

other

60-cycle

vertical-sync

pulse

is ac-

cepted

by

the

sweep

delay

circuitry,

allowing

display

of

the

other

interlaced

field.

SWEEP

MAGNIFIER

Frequenty

it is

desirable

to

examine

a

portion

of

the

waveshape

under

observation

in

greater

detail,

for

instance

the

rate

of

fall

of

a fairly

long

pulse.

In

the

524AD,

the

sweep

magnifier

makes

it

possible

to

expand

any

desired

33.3

per

cent

or

IO

per

cent

of

the

sweep

to

cover

the

entire

tube

face.

The

operating

procedure

is

as follows:

Turn

the

sweep

MAGNIFIER

to

OFF.

Adjust

the

sweep-time

and

horizontal-

positioning

controls

so

that

the

portion

of

the

wave

to

be

magnified

is

at

the

center

of

the

tube.

Then

move

the

MAGNIFIER

control

to

either

3X

or

lOX

and

the

portion

of

the

wave

in

the

center

of

the

tube

will be

magnified

linearly

in

both

directions.

The

accuracy

of

sweep

magni-

fication will be

within

five

per

cent

for

sweep

speeds

to

1.0 µSEC/CM.

The

accuracy

will de-

crease

for

sweep

speeds

in

excess

of

this

amount.

If

the

portion

of

the

wave

to

be

magnified

moves

from

the

center

of

the

screen

when

the

MAGNIFIER is

turned

to

one

of

the

two

po-

sitions

for

magnification,

the

MAG. POS.

ad-

justment

should

be

reset.

(See

Maintenance

section.)

NOTE:

A

sweep

of

10

cm

per

mi-

crosecond

is

about

the

limit

of

the

sweep

amplifier.

Some

non-linear-

ity

will

result

if

the

sweep

exceeds

this

value.

EXTERNAL

SWEEP

INPUT

In

the

full-counterclockwise

position

of

the

sweep

TIME

switch

a

binding

post

labeled

EXT

SWEEP

INPUT

is

connected

to

the

sweep-

amplifier

input.

This

connection

can

be

used,

for

example,

for a

sine-wave

oscillator

for fre-

quency-comparison

measurements,

for

an

aux-

iliary

slow-sweep

generator,

etc.

The

connection

to

the

sweep

amplifier

is

made

through

a po-

tentimeter

ganged

with

the

sweep

STABILITY

control,

for

adjustment

of

the

amplitude

of

the

external

sweep.

The

magnifier

circuits

and

the

horizontal-positioning

control

operate

on

sweep

voltages

applied

at

this

connector.

At

maximum

sensitivity

with

the

MAGNIFIER

at

lOX

and

the

SWEEP

ATTEN.

control

full clockwise,

the

deflection

factor

is

about

.25

volts

per

centi-

meter,

peak

to

peak.

@

®J

OPERATING

INSTRUCTIONS-PAGE

3

TYPE

524AD

Tektronix 524AD series Bedienungsanleitung

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