Tektronix 531 Manual de usuario

CATHODE

RAY

OSCILLOSCOPE

TYPE

531/541

INSTRUCTION

MANUAL

TEKTRONIX,

INC.

MANUFACTURERS

CATHODE-RAY

AND

VIDEO

TEST

INSTRUMENTS

Sunset

Highway

and

Barnes

Road

P.O.Box

831

Portland

Oregon,

S.A.

Phone:

CYpress

2-2611

Cables:

Tektronix

070-203

NOTE

This

instruction

manual

has

been

prepared

cover

TEKTRONIX

Type

531/541

Oscilloscopes

all

serial

number

ranges.

Text,

diagrams,

and

parts

lists

have

been

expanded

incorporate

all

circuit

modifications

adopted

during

the

course

manufacture.

The

serial

ranges

instruments

which

various

modifications

were

applied

before

shipping

from

the

factory

have been

noted

wher-

ever

necessary.

However,

because

many

instruments

have

been

modified

the

field

and

out

serial

sequence,

component

values

and

circuitry

given

instru-

ment

may

differ

considerably

from

those

indicated

this

manual

for

its

serial

number.

Theuser

urged,

therefore,

enter

whatever

changes

may

necessary

bring

this

manual

intoagreement

with

the

present

circuitry

his

oscilloscope.

When

ordering

parts,

always

include

the

fol-

lowing

information:

Instrument

Type

(531/541).

Instrument

Serial

Number

(as,

S/N

9999).

Part

Circuit

Number

(as,

R999).

Part

Description

(value,

type,

rating,

tolerance,

etc.).

The

6-digit

TEKTRONIX

part

number

(as,

999-999),

kone

SAFETY

NOTICE

This

oscilloscope

employs

dangerously

high

voltages,

Since

some

maintenance

must

necessity

performed

with

the

case

removed,

great

care

should

taken.

Use

only

insulated

tools,

stand

dry

floor

and

possible

keep

one

hand

your

pocket.

Care

should

also

used

making

any

con-

nections

the

deflection

plates

the

cathode-ray

tube

through

the

access

panel.

advised

that

the

access

panel

never

removed

until

the

power

has

first

been

turned

off.

The

instru-

ment

should

not

operated

with

this

protective

cover

removed,

CONTENTS

GENERAL

DESCRIPTION

SECTION

Characteristics.

Functions

Front-Panel

Controls

and

Connectors.

OPERATING

INSTRUCTIONS

SECTION

Preliminary

Instructions.

First-Time

Operation.

Triggering

Modes.

‘Triggering

Instructions.

Sweep

Operation.

Auxiliary

Functions.

Sim-

plified

Sweep

Diagrams.

CIRCUIT

DESCRIPTION

SECTION

Block

Diagram.

Vertical-Deflection

System.

Horizontal-Deflection

System.

Power

Supply.

CRT

Circuit.

MAINTENANCE

SECTION

General

Information.

Trouble

Shooting.

Recalibration

Procedure.

PARTS

LIST

SECTION

GENERAL

DESCRIPTION

NOTE

The

Types

531

and

541

are

high-speed

laboratory

oscilloscopes,

designed

for

general

laboratory

use.

Their

extremely

fast

rise-

time,

wide

sweep-speed

range

and

10-kilovolt

accelerating

volt-

age

permit

accurate

analysis

many

types

waveforms.

Addi-

tional

adaptability

provided

plug-in

preamplifiers

which

extend

the

use

these

oscilloscopes

practically

all

laboratory-

oscilloscope

applications.

Accurately

calibrated

sweep

speeds

and

vertical-deflection

sensitivity

permit

quantitative

time

and

amplitude

measurements

made.

CHARACTERISTICS

Cathode-Ray

Tube

Tektronix

5-inch

post-deflection

accelera-

tion

cathode-ray

tube

furnished

with

the

in-

strument.

With

10-kv

acceleration

potential

the

trace

bright

enough

that

single

sweep

can

photographed

with

Pll

screen

even

the

fast-

est

sweep

speeds.

phosphor

furnished

unless

other

phosphors

are

specially

requested.

Vertical-Deflection

System

dc-coupled

vertical

amplifier

the

main

unit

adjusted

for

optimum

transient

response

and

wide

passband.

plug-inchannel-switching

unit

provides

dual-trace

presentation

for

re-

petitive

signals.

Input

the

vertical-deflection

system

must

made

through

one

the

avail-

able

types

plug-in

units.

Horizontal-Deflection

System

Sweep

Circuit

The

linear

sweep

generator

Miller

runup

generator

with

excellent

linearity,

and

the

ex-

tremely

wide

speed range

.02

microseconds

per

centimeter

seconds

per

centimeter.

Twenty-four

calibrated

sweep

speeds

are

avail-

able

accurate

within

three

per

cent.

The

main

sweep

control

has

eight

positions,

.1,

10,

and

100

microseconds

per

centimeter,

10,

100

milliseconds

per

centimeter,

and

second

per

centimeter.

Three

multiplier-switch

positions

1, 2,

and

times,

provide

total

twenty-

four

speeds.

Remaining

positions

the

multi-

plier

switch

provide

continuously

adjustable

531/54I—GENERAL.

DESCRIPTION

multipliers

2.5

times,

and

times

that

the

above

range

also

covered

continuously.

The

five-times

sweep

magnifier

increases

the

maximum

sweep

speed

.02

microseconds

per

centimeter.

Magnifier

Sweep

magnification

produced

increasing

the

sweep

output

amplifier

gain

five

times.

The

center

two

centimeters

the

trace

expanded

centimeters,

Any

one-fifth

the

sweep

magnified

can

positioned

show

the

screen

means

the

HORIZONTAL

POSI-

TION

control.

DC-Coupled

Unblanking

The

unblanking

square

wave

dc-coupled

the

grid

the

cathode-ray

tube

assure

uni-

form

unblanking

bias

for

all

sweep

times

and

repetition

rates.

Triggering

System

The

sweep

can

triggered

wide

range

triggering

voltages

either

derived

internally

from

the

signal

displayed,

through

front-panel

connector

from

external

source.

The

circuit

permits

the

sweep

triggered

from

any

selected

point

along

the

triggering

waveform.

recurrent

triggering

arrangement

which

runs

fifty-cycle

repetition

rate

will

synchronize

with

repetitive

trigger

signals

from

sixty

cycles

two

megacycles.

PAGE

1-1

Horizontal-Deflection

Amplifier

de-coupled

horizontal-deflection

amplifier

provides

horizontal

sensitivity

volts

per

centimeter

approximately

volts

per

centimeter,

continuously

adjustable

means

ten-to-one

continuously

adjustable

control

and

10X

and

switched

attenuator.

Because

this

amplifier

was

designed

for

op-

timum

performance

with

sweep

sawtooth,

its

performance

with

sine

waves

limited.

This

sine-wave

limitation

can

best

defined

amplitude-frequency

product,

which

can

ex-

ceeded

only

the

expense

considerable

dis-

tortion.

The

amplitude-frequency

product

2.4

centimeter-megacycles.

Thus

full

10-

centimeters

deflection

can

used

240

kc,

and

2.4-me

sine

wave

can

viewed

the

amplitude

one

centimeter

peak-to-peak

less.

The

amplifier

frequency

response

toa

sine

wave

down

less

than

30%

400

when

the

amplitude

within

this

limitation.

Output

Waveforms

Available

Front-panel

connectors

provide

positive-

going

sawtooth,

positive

gate

synchronized

with

the

sweep,

and

signal

derived

from

the

displayed

vertical

signal.

The

calibrator

pro-

vides

adjustable

amplitude

symmetrical

square

wave

with

repetition

rate

about

one

kilocycle,

The

amplitude

adjustable

intwenty

steps

between

millivolts

and

100

volts.

Power

Supply

All

voltages

are

regulated

accommodate

line-voltage

variations

between

105

and

125

volts

210

volts

250

volts,

cycles,

ac,

and

for

the

differences

loads

imposed

the

different

plug-in

units.

Power

Consumption

117

234

volts,

475

watts

with

plug-

unit

place.

Cooling

Safe

operating

temperature

maintained

with

filtered,

forced-air

ventilation.

thermal

dis-

connect

device

turns

off

the

power

the

event

the fan

fails

the

air

intake

becomes

blocked.

Illuminated

Graticule

The

graticule

accurately

scribed

centi-

meters

and

fifths

centimeters.

The

scribed

lines

can

edge-lighted

either

white

red

light.

green

filter

supplied

increase

contrast

the

presence

room

brightness.

extra

cost,

light

shield

available

con-

structed

that

will

slip

onover

the

graticule

bezel.

Mechanical

Characteristics

Construction

The

cabinet

and

chassis

are

madeof

electric-

ally-welded

aluminum

alloy.

Finish

Photo-etched

anodized

aluminum

-alloy

panel,

wrinkle-enameled

cabinet.

Dimensions

inches

long,

inches

wide,

16-3/4

inches

high.

Weight

61-1/2

pounds.

FUNCTIONS

FRONT-PANEL

CONTROLS

AND

CONNECTORS

TRIGGERING

MODE

(red

knob)--Five-position

switch

arranges

trigger

circuits

for

five

kinds

triggering:

DC,

SLOW,

FAST,

AUTOMATIC

and

SYNC,

Type

531

instruments,

S/N

101-6010

and

Type

541,

S/N

101-5414,

AUTOMATIC

labeled

AUTO,

Type

531,

S/N

101-592,

there

SYNC

position.

PAGE

1-2

TRIGGER

SLOPE--Six-position

switch

selects

source

trigger

signal

and

converts

negative-going

output,

either

negative-going

positive-going

input.

TRIGGER

INPUT--UHF

coax

connector

trig-

gering

circuits

through

EXT

positions

TRIGGER

SLOPE

switch.

531/541—GENERAL

DESCRIPTION

STABILITY

(red

knob)--Contro]

for

adjusting

the

stability

the

sweep

circuits

for

stable

display.

The

control

has

PRESET

position

suitable

for

most

triggering

ap-

plications.

Type

531,

S/N101-6710,

and

Type

541,

S/N101-5942,

have

PRESET

position

the

STABILITY

control.

TRIGGERING

LEVEL--Potentiometer

deter-

mines

part

triggering

waveform

where

sweep

triggers.

TIME/CM-

-Eight-position

switch

selects

timing

capacitors

determine

sweep

speeds,

and

determine

duration

trigger

holdoff

period.

MULTIPLIER-

-Six-position

switch.

Three

po-

sitions

place

precision

charging

resistors

series

with

timing

capacitors

determine

sweep

speeds

conjunction

with

selected

timing

capacitor.

Three

positions

marked

red,

place

adjustable

charging

voltages

series

with

timing

capacitors

for

contin-

uous

control

sweep

speeds.

MAGNIFIER--Two-position

switch

removes

inserts

feedback

sweep

amplifier

change

sweep

speeds

factor

five.

HORIZONTAL

DISPLAY--Three-position

switch

connects

sweep

amplifier

internal

sweep

generator

one

position,

front

panel

connector

directly

through

10-1

fixed

attenuator

second

and

third

positions.

EXTERNAL

SWEEP

ATTENUATOR,

10-1---

Continuously

adjustable

gain

control

hor-

izontal

amplifier.

Switched

out

circuit

for

internal

sweeps.

EXTERNAL

SWEEP

IN--Front-panel

connector

horizontal

amplifier

through

HORIZON-

TAL

DISPLAY

switch.

Magnifier

must

switched

for

undistorted

10-cm

deflection.

VERT.

SIG.

OUT--Front-panel

connector

sup-

plies

signal

from

vertical

amplifier

via

trigger

cathode

follower.

HORIZONTAL

POSITION--

Positions

trace

along

horizontal

axis.

531/541—-GENERAL

DESCRIPTION

VERNIER

(red

knob)-

-Fine

adjustments

hori-

zontal

positioning,

with

five

times

the

reso-

lution

the

coarse

adjustment.

SQUARE-WAVE

CALIBRATOR

(red

knob)---

Three-position

switch

turns

calibrator

plate

voltage

and

switches

out

1000-

to-1

voltage

divider

give

either

volts

millivolts

output.

SQUARE-WAVE

CALIBRATOR

(black

knob)---

Nine-position

switch

selects

nine

taps

precision

voltage

divider

calibrator

cir-

cuit.

Provides

accurate

voltages

.2,

.5,

10,

20,

50,

and

100

volts

VOLTS

position,

millivolts

the

MILLIVOLTS

position

the

red

concentric

control

knob.

CAL

OUT---UHF

coax

front-panel

connector

from

the

calibrator.

+GATE

OUT---Front-panel

binding

post

sup-

plies

positive

20-volt

square

pulse,

dc-cou-

pled

through cathode

follower

synchronized

with

the

internal

sweep.

SAWTOOTH

OUT---Front-panel

binding

post

supplies

150-volt

positive-going

sawtooth

dc-coupled

through

cathode

follower,

syn-

chrenized

with

the

internal

sweep.

POWER---On-off

switch

primary

power

transformer

and

ventilating-fan

lead.

FOCUS--

Adjustable

voltage

for

the

cathode-ray

tube

focusing

grid.

INTENSITY--Bias

adjustment

cathode-ray

control

grid.

ASTIGMATISM-

Adjustable

voltage

for the

astig-

matism

grid

the

cathode-ray

tube.

SCALE

ILLUM-

-Adjustable

series

resistor

con-

trols

voltage

across

graticule

lights.

Beam-

position

indicators,

unlabeled,

marked

with

arrows.

Thé

arrow

nearest

the

illuminated

indicator

shows

which

way

the

beam

off

the

screen

cannot

seen.

Rear

Cabinet

CRT

CATHODE--Binding

post

connects

crt

cathode

through

high-voltage

capacitor.

In-

put

impedance

Discharge

time

eonstant

about

milliseconds.

PAGE

1-3

SECTION

OPERATING

INSTRUCTIONS

PRELIMINARY

INSTRUCTIONS

Cooling

The

Oscilloscope

cooled

filtered,

forced-

air

ventilation.

The

instrument

must

therefore

placed

the

air

intake

not

blocked,

and

the

filter

must

clean

enough

permit

ade-

quate

air

circulation.

the

interior

tempera-

ture

does

rise

too

high

for

some

reason,

thermal

cutout

switch

will

disconnect

the

power

and

keep

disconnected

until

the

temperature

drops

safe

value.

Time-Delay

Power

Relay

time-delay

relay

delays

application

the

rectified

the

circuits

long

enough

for

all

heaters

reach

operating

temperature.

The

time

delay

approximately

seconds,

you

switch

the

power

off,

even

briefly,

the

time-

delay

relay

will

delay

reapplication

the

dc.

Cathode-Ray

Tube

Controls

The

Tektronix

cathode-ray

tube

inthis

instru-

ment

has

total

accelerating

voltage

10,000

volts.

The

spot

intensity

with

this

amount

acceleration

can

bright

enough

damage

the

screen

short

time

the

spot

left

one

place.

careful

not

leave

fixed

bright

spot

slow

sweep

on the

screen.

Turn

the

INTENSITY

control

counterclockwise

that

the

spot

dim

whenever

you

leave

the

instru-

ment

unattended.

The

separate

FOCUS,

ASTIGMATISM

and

IN-

TENSITY

controls

are

somewhat

interdependent,

and

may

require

readjustment

for

different

IN-

TENSITY

control

settings.

Illuminated

Graticule

The

adjustable

graticule

lighting

control

la-

beled

SCALE

ILLUM.,

can

adjusted

suit

the

lighting

conditions

the

room.

Thecolored

filter

supplied

colored

provide

the

maximum

trace

contrast

for

the

phosphor

the

pres-

ence

room

light.

The

graticule

accurately

scribed

centi-

meters

and

fifths

centimeters.

These

scale

markings

and

the

calibrated

fixed

vertical-de-

flection

sensitivities

and

sweep

times,

can

used

convert

deflections

centimeters

into

volts

and

seconds.

Vertical

sensitivities

are

calibrated

volts

per

centimeter,

and

hori-

zontal

sweep-times

are

calibrated

seconds

per

centimeter,

which,

multiplied

centimeters

deflection,

give

volts

and

seconds.

The

graticule

can

mounted

either

two

positions

rotated

180

degrees

from

each

other.

one

position,

the

graticule

illumination

colored

red,

and

the

other

position

white.

The

white

will

reproduce

well

photographically.

FIRST-TIME

OPERATION

First

get

atrace

onthe

screen

the

simplest

method,

and

then

proceed

with

the

presentation

you

want

after

you

get

idea

the

functions

the

controls

get

simple

trace

the

screen,

insert

preamplifier,

and

proceed

follows:

Turn

the

POWER

switch

OFF.

Connect

the

power

cord

toa

source

117-volt,60-cycle

pow-

er.

Then

set

the

front-panel

controls

follows:

INTENSITY

Counterclockwise

(CCW)

FOCUS

Center

531/541-OPERATING

INSTRUCTIONS

ASTIGMATISM

Center

POWER

TRIGGERING

LEVEL

CCW

STABILITY

(red

knob)

PRESET

CCW

TRIGGER

SLOPE

INT

PAGE

2-1

TRIGGERING

MODE

(red)

Connect

lead

between

the

CAL,

OUT

ter-

AUTOMATIC

AUTO

minal

and

the

INPUT

terminal

the

unit.

Set

TIME/CM

100

MICRO

SEC

MULTIPLIER

HORIZONTAL

DISPLAY

INTERNAL

SWEEP

HORIZONTAL

POSITION

Center

SQUARE-WAVE

CALIBRATOR

VOLTS,

MILLIVOLTS,

OFF

VOLTS

the

controls

the

plug-in

follows:

AC--DC

AC.

VOLTS/CM

VARIABLE

Clockwise

VERTICAL

POSITION

Center

When

the

POWER

switch

has

been

turned

for

about

one

minute,

turn

the

INTENSITY

control

clockwise

until

you

can

see

trace

the

screen.

With

the

calibrator

waveform

dis-

played,

you

can

set

the

FOCUS,

INTENSITY

and

ASTIGMATISM

controls

for

sharp

line,

and

position

the

trace

near

the

screen

center

with

the

HORIZONTAL

POSITION

and

VERTICAL

POSITION

controls.

TRIGGERING

MODES

Automatic

You

are

now

displaying

the

calibrator

wave-

form,

whose

repetition

rate

about

one

kilo-

cycle,

and

whose

amplitude

five

volts,

peak-

to-peak,

with

the

AUTOMATIC

mode

trigger-

ing.

This

about

the

simplest

mode

trigger-

ing.

useful

for

general

purpose

viewing,

and

will

operate

satisfactorily

for

wide

variety

trigger

signals

whose

repetition

rates

are

be-

tween

sixty

cycles

and

about

two

megacycles.

Slow

When

you

have

good,

well-focused

trace

the

calibrating

waveform

the

AUTOMATIC

mode

triggering,

try

the

other

four

TRIG-

GERING

MODE

switch

positions.

Turn

the

switch

the

SLOW

position.

Advance

the

TRIGGERING

LEVEL

control

clockwise

until

you

getastable

trace

again.

There

may

con-

siderable

range

the

LEVEL

control

over

which

you

can

get

stabletrace,and

the

start

the

trace

will

move

and

down

the

edge

the

square

wave

within

this

range.

Notice

that

the

trace

starts

the

upgoing

partof

the

calibrator

square

wave.

Now

turn

the

TRIGGER

SLOPE

switch

the

-INT

position,

and

readjust

the

TRIGGER-

ING

LEVEL

obtain

stable

trace

again.

No-

tice

now

that

the

trace

starts

the

down-going

portion

the

trace

and

that

the

position

the

PAGE

2-2

start

can

again

changed

somewhat

with

the

LEVEL

control.

Triggering

Now

turn

the

TRIGGERING

MODE

switch

DC,

Adjust

the

LEVEL

control

for

stable

trig-

gering,

and

then

position

the

trace

with

the

VERTICAL

positioning

control.

You

will

notice

that

triggering

occurs

vertical

level

the

screen

selected

the

LEVEL

control

and

that

the

triggering

point

changes

relative

the

waveform

the

waveform

positioned

verti-

cally.

This

effect

will

noticeable

you

look

low-frequency

sine

wave.

This

triggering

position

most

useful

for

low-frequency

signals.

not

suitable

for

applications

where

the

level

changing

such

when

Dual-Trace

Unit

being

used.

Fast

the

FAST

position

the

TRIGGERING

MODE

switch,

the

circuit

quite

similar

that

the

SLOW

position,

and

you

will

notice

difference

when

displaying

the

cali-

brator

waveform.

The

only

difference

thatan

filter

inserted

the

circuit,

making

insensitive

low

frequencies,

and

allowing

recover

quickly

from

level

changes.

This

the

position

use

when

there

hum

present.

This

also

the

best

position

use

with

the

531/541-OPERATING

INSTRUCTIONS

alternate

sweep

feature

the

53/54C

unit

you

use

INTernal

triggering

with

signals

having

fre-

quency

components

above

kc.

Sync

The

SYNC

position

the

TRIGGERING

Triggering

Level

The

TRIGGERING

LEVEL

control

selects

the

point

the

triggering

waveform

which

trig-

gering

will

occur.

trigger

small

signals

this

control

must

set

near

the

level

with

triggering.

The

levels

are

indi-

cated

the

panel

positive

the

right

and

negative

the

left.

Negative

positions

the

LEVEL

control

cause

triggering

occur

dur-

ing

negative

levels

the

triggering

waveform

and

positive

positions

cause

triggering

during

positive

levels.

This

control

not

used

the

AUTOMATIC

and

SYNC

positions

the

TRIGGERING

MODE

switch.

Trigger

Slope

The

positions

the

TRIGGERSLOPE

switch

(black

knob)

cause

triggering

occur

during

the

rising

portion

the

triggering

waveform.

The

level

may

either

negative

positive.

The

positions

cause

triggering

occur

during

the

falling

portion

the

waveform.

Thus

for

slow

rising

waveforms

such

sine

waves,

the

triggering

point

can

caused

occur

almost

any

point

the

waveform.

additional

function

the

TRIGGERSLOPE

switch

selects

the

source

trigger

signals.

For

each

the

available

signal

sources,

the

switch

provides

choice

positive

negative

slope.

Triggering

Mode

The

TRIGGERING

MODE

switch

arranges

the

circuits

provide

the

kind

triggering

you

need.

This

the

red

knob

and

the

positions

selects

are

labeled

red

the

panel.

Slowly

changing

waveforms

work

best

the

SLOW

and

positions.

the

SLOW

position

capacitor

removes

the

component

the

triggering

waveform

and

makes

triggering

the

vertical

signal

independent

trace

posi-

531/541—-OPERATING

INSTRUCTIONS

MODE

switch

primarily

for

signals

having

repetition

rate

excess

ten

megacycles.

this

position

the

sweep

will

trigger poorly,

all,

the

calibrator

waveform.

trigger

high-frequency

signal,

simply

advance

the

STABILITY

control

until

stable

trace

ob-

tained.

The

LEVEL

control

not

used

this

position.

INSTRUCTIONS

tion.

This

position

suitable

for

signals

from

twenty

cycles

about

five

ten

megacycles.

The

position

the

same

except

that

re-

sponds

well.

the

FAST

position,

the

circuit

includes

filter,

useful

for

pre-

venting

60-cycle,

other

low-frequency

com-

ponents,

from

triggering

the

sweep

when

both

high-

and

low-frequency

components

are

present

the

triggering

waveform.

The

low-frequency

limit

about

two

kilocycles.

these three

positions,

the

STABILITY

control

properly

set,

the

sweep

will

not

run

unless

triggered

signal.

The

AUTOMATIC

and

SYNC

switch

posi-

tions

both

arrange

synchronizing

circuits

rather

than

strictly

triggering

circuits.

The

AUTO-

MATIC

circuit

provides

free-running

multi-

vibrator

with

normal

repetition

rate

about

cycles,

which

locks

and

runs

synchro-

nously

with

recurrent

triggering

waveforms

from

cycles

about

megacycles.

The

synchronized

multivibrator

then

triggers

the

sweep-gating

multivibrator,

The

SYNC

switch

setting

arranges

cir-

cuit

which

connects

the

triggering

source

di-

rectly

the

sweep-gating

multivibrator

that

can

synchronize

with

the

triggering

wave-

form.

The

sweep-gating

multivibrator

must

free-running

for

this

type

operation.

free-

runs

advanced

settings

the

STABILITY

control.

will

synchronize

with

signals

whose

frequencies

are

high

megacycles,

ata

sweep-repetiton:

rate

200

kilocycles.

Stability

The

STABILITY

control

adjusts

bias

level

the

sweep-gating

multivibrator

near

the

level

which

will

free-run.

Three

principal

settings

the

STABILITY

control

are

used,

the

first

setting

with

the

control

advanced

the

right,

just

past

the

point

where

the

sweep-gating

mul-

tivibrator

free-runs;

second,

retarded

the

left

PAGE

2-3

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