Tektronix 3A74 Bedienungsanleitung

INSTRUCTION

ANI

UAL

Serial

Number

Tektronix,

Inc.

S.W.

Millikan

Way

P.O.

Box

500

Beaverton,

Oregon

Phone

4-0161

Cables:

Tektronix

070-347

863

be]

—_

Type

3A74

”

TYPE

3A74

AMPLIFIER

FOUR-TRACE

MEG,

VOLTS/DIV.

POSITION

BAL.

MODE

NORM,

MEG.

VOLTS/DIV.

POSITION

‘Ss

BAL.

“

MopE

NORM,

VOLTS/DIV.

BAL.

POSITION

MODE

NORM.

ADJ.

VOLTS/DIV.

POSITION

BAL.

“MODE

NORM.

ADJ.

n(®)

ian

PORTLAND.

OREGON.

U.S.A.

SERIAL

KTRONIX.

INC

Type

3A74

SECTION

CHARACTERISTICS

General

Information

The

Type

3A74

Four-Trace

Amplifier

Plug-In

Unit

de-

signed

for

use

with

all

Type

560-Series

Oscilloscopes*

except

the

Type

560

itself.

The

Type

3A74

contains

four

independent

amplifier

channels.

Each

channel

can

used

separately

produce

single

display

electronically

switched

pro-

duce

multi-trace

displays.

These

features

reduce

cable

switch-

ing

minimum.

Each

amplifier

channel

has

its

own

input

coupling,

attenuator,

variable

gain,

position

and

mode

controls

which

permit

individual

adjustment

each

channel

for

best

measurement

conditions.

multi-trace

operation

there

choice

two

modes

operation—chopped

alternate.

the

chopped

mode

(free-running

electronic

switching),

internal

oscillator

switches

the

channels

sequentially

free-running

rate

about 500ke.

the

alternate

mode

(triggered

electronic

switching)

the

oscilloscope

time-base

generator

internally

switches

the

channels

the

end

each

sweep.

Switching

occurs

during

retrace

intervals.

Bandpass

mc.

Risetime

0.17

microsecond.

Calibrated

Deflection

Factors

Nine

calibrated

steps

provided

for

each

channel:

0.02,

0.05,

0.1,

0.2,

0.5,

2, 5,

and

volts/div.

When

the

gain

set

accurately

for

the

0.02

volt/div.

step,

the

other

steps

will

accurate

within

their

respective

panel

readings.

Uncalibrated

Deflection

Factors

Variable

controls

for

each

channel

permit

continuous

uncalibrated

adjustments

from

0.02

volt/div.

approxi-

mately

volts/div.

Input

Impedance

megohm

+1%

paralleled

by 47

+3%.

*Type

561

Oscilloscopes

below

serial

number

580

must

modified

first

obtain

proper

multi-trace

operation

from

the

Type

3A74.

your

oscilloscope

needs

modified,

ask

your

Tektronix

Field

Engineer

for

Modification

Kit

No.

040-267.

This

modification

not

needed

any

the

Type

RM561

Oscilloscopes

because

they

are

all

compatible.

Maximum

Allowable

Signal

Voltage

Input

Connectors

=£600

volts

peak.

Input

Coupling

Selectable

coupling.

the

position

coupling

capacitor

inserted,

limiting

the

low-frequency

response

about

cps

down.

With

10X

attenuator

probe

low-frequency

response

extended

0.2

cps;

with

100X

probe,

response

cps.

Operating

Modes

Channel

2, 3,

only.

Chopped—Sequential

electronic

switching

two

channels

approximately

500-ke

rate.

The

input

for

each

channel

chopped

into

“on”

and

“‘off’’

segments.

Thus

the

display

each

channel

series

2-ysec

“on”

segments.

Alternate—Triggered

electronic

switching

sequentially

from

channel

during

retrace

intervals.

Polarity

Inversion

Polarity

switch

for

each

channel

permits

inverting

the

displayed

waveform.

Construction

Aluminum-alloy

chassis.

Finish

Photo-etched

anodized

aluminum

front

panel.

Net

Weight

lbs.

oz.

Included

Accessories

Tektronix

Qty.

Part

Number

Description

103-033

Adapter,

single

binding

post

fitted

with

BNC

plug.

070-347

Type

3A74

Instruction

Manuals.

NOTES

SECTION

OPERATING

INSTRUCTIONS

NOTE

The

Type

3A74

can

used

either

the

X-axis

Y-axis

plug-in

opening

Tektronix

Type

561-

Series,

567,

RM567

oscilloscopes.

the

fol-

lowing

discussion

assume

that

the

Type

3A74

inserted

the

left-hand

(Y-axis)

opening

which

will

provide

vertical

deflection

with

crt

beam

blanking

the

channel

switching

transient.

the

Type

3A74

used

with

Type

565

RM565

Dual-Beam

Oscilloscope,

assume

the

unit

inserted

the

left-hand

vertical

opening.

FUNCTIONS

FRONT-PANEL

CONTROLS

AND

CONNECTORS

Table

2-1

describes

the

functions

the

front-panel

con-

trols.

Since

the

four

channels

are

identical,

the

functions

channel

control

and

the

inputs

connector

are

described

the

table.

Functions

the

controls

for

the

other

channels

are

identical.

Fig.

2-1

shows

the

front-panel

layout.

TABLE

2-1

INPUT

CONNECTOR

BNC

Type

jack

for

coupling

input

voltages

the

chan-

nel

amplifier.

AC-GND-DC

Three-position

miniature

toggle

switch

provides

choice

coupling,

grounding

the

channel

]

input

circuit

without

grounding

the

input

connector.

VOLTS/DIV.

Nine-position

switch

select

the

calibrated

vertical

deflection

factors.

VAR.

GAIN

Provides

continuously

variable

attenuation

between

the

calibrated

deflection

factors,

and

extends

the

attenua-

tion

range

approximately

volts/div.

This

control

has

360°

rotation

and

has

detent

position

for

the

CAL.

(calibrated)

position.

BAL.

Screwdriver-adjustable

potentiometer

balance

the

amplifier

levels

the

trace

does

not

shift

position

the

VAR.

GAIN

control

varied.

GAIN

ADJ.

Screwdriver-adjustable

potentiometer

precisely

adjust

the

deflection

factor

the

channel.

(.02

VOLTS/DIV.

the

deflection

factor

normally

calibrated.)

POSITION

Potentiometer

provide

vertical

positioning

the

trace.

MODE

Three-position

switch

provides

the

following

choices:

‘a

normal

display,

inverted

display,

display

all.

the

NORM.

position

the

display

has

the

same

polarity

the

input

signal.

the

INV.

position

the

polarity

the

signal

inverted.

the

OFF

position

the

channel

turned

off;

during

muiti-trace

operation

the

channel

excluded

from

the

switching

cycle.

TRIGGER

push-pull

switch

which,

when

pulled,

permits

internal

triggering

channel

signal

only,

regardless

the

channel

MODE

switch

settings.

When

the

switch

pushed

with

two

channels

‘‘on",

the

time-

base

triggers

from

the

composite

time-shared

vertical

signal.

With

only

one

channel

on,

the

channel

dis-

played

provides

the

triggering

signal.

Plug-In

Securing

Knob

Permits

locking

the

Type

3A74

the

plug-in

com-

partment.

(This

knob

located

bottom

center

the

plug-in

unit.)

CALIB.

Master

gain

control

for

adjusting

the

common

gain

all

channels.

Compensates

for

differences

ert

deflec-

tion

sensitivities.

NOTE

For

plug-in

units

S/N

156

and

up,

including

S/N

133

unit

(modified

out

sequence)

CALIB.

con-

trol

shaft

has

shorter

length.

The

shorter

shaft

permits

the

front-panel

mounting

bushing

used

ground-connection

banana

jack.

CHOP.-ALT.

Two-position

toggle

switch

select

either

alternate

chopped mode

operation.

FIRST

TIME

OPERATION

place

the

Type

3A74

into

operation

for

the

first

time,

rotate

the

plug-in

securing

knob

counterclockwise

move

the

latch

its

fully

counterclockwise

unlatched

position.

Insert

the

unit

the

left-hand

plug-in

opening

Tek-

tronix

Type

560-Series

oscilloscope

(except

the

Type

560).

Rotate

the

plug-in

securing

knob

clockwise

until

hand

tight.

Turn

the

oscilloscope

power.

Allow

about

minutes

warm-up

time

and

free

run

the

time

base

millisec/div.

Set

the

front-panel

controls

the

Type

3A74

these

settings.

AC-GND-DC

(all

channels}

VOLTS/DIV.

(all

channels)

VAR.

GAIN

(all

channels)

CAL.

2-1

Operating

Instructions

—

Type

3A74

VOLTS/DIV.

tmeo.

VOLTS/DIV.

eau,

POSITION

os,

MODE

nw,

Fig,

2-1.

Front-pane!l

view

the

Type

3A74

showing

grouping

controls

and

connectors

for

each

channel.

Nomenclature,

used

the

text,

also

shown,

2-2

Operating

Instructions

—

Type

3A74

POSITION

(all

channels)

Centered

MODE

(channel

NORM.

MODE

{channel

and

OFF

TRIGGER

Pushed

Ch.

Trace

CHOP.-ALT.

ALT.

Ch.

Trace

Using

the

graticule

centerline

reference,

vertically

-°

ae ee

ee ee

position

the

trace

about

two

divisions

above

the

centerline

HEE

BEE

EHH

with

the

channel

POSITION

control.

(If

you

are

using

trace

OT OE

Type

565

Dual-Beam

Oscilloscope,

use

the

upper

beam

Pape

graticule

centerline

the

reference.)

. .

Chef

Trace

Place

channel

MODE

switch

NORM.

and

posi-

tion

the

channel

trace

about

one

division

above

the

graticule

center

with

the

channel

POSITION

control.

Set

channel

MODE

switch

NORM.

and

position

its

trace

near

the

graticule

centerline

with

the

channel

(a)

Chopping

rate

per

channel

125

kc;

sweep

rate

POSITION

control

usec/div.

Place

channel

MODE

switch

NORM.

and

position

its

trace

one

division

below

the

graticule

center

with

the

sweep

the

time

base

switches

the

channel

succes-

sion

during

the

retrace

interval.

usec

channel

POSITION

control.

This

makes

total

four

traces

the

crt.

For

each

sweep

cycle

one

channel

“

usec

displayed

and

the

others

are

shut

off.

the

end

each

view

the

alternate-trace

switching

cycle

slow

HEHEHE

HHH

motion,

decrease

the

sweep

rate

0.1

sec/div.

observe

chopped

mode

operation,

set

the

CHOP.-

ALT.

switch

the

CHOP.

position.

your

oscilloscope

has

CRT

Cathode

Selector

(Z-axis}

switch

mounted

the

rear

panel,

set

this

switch

the

Chopped

Blanking

posi-

tion

blank

(shut

off}

the

crt

beam

while

the

Type

3A74

switches

between

channels.

davadagtiu

tapi

(b)

Chopping

rate

per

channel

125

ke;

sweep

rate

Set

the

oscilloscope

triggering

controls

for

internal

psec/div.

triggered-sweep

operation.

Notice

that

all

four

traces

seem

start

simultaneously

and

continue

across

the

crt

screen.

Increase

the

sweep

rate

usec/div.

Adjust

the

oscilloscope

Trigger

Level

control

obtain

stable

display.

Notice

that

each

trace

composed

many

short-duration

bits

segments

(see

Fig.

2-2a).

popu

tpigy

Terry

-L

Ch.

Trace

10.

see

the

chopped-mode

switching

action,

increase

the

sweep

rate

wsec/div

and

increase

the

crt

intensity.

chopped-mode

operation

all

four

channels

are

elec-

tronically

switched

sequentially

rate

approximately

500

ke.

Observe

that

each

channel

“‘on’’

for

about

usec

and

then

turned

off

for

psec

while

the

other

three

chan-

nels

are

each

“‘on"

for

usec

(see

Fig.

2-2b].

The

sampling

rate

each

channel

about

125kce.

(500

divided

the

number

channels

use.)

Switching

time

between

channels

approximately

0.3

psec.

TTT

{c)

Chopping

rate

per

channel

250

kc;

sweep

rate

11.

Now

set

channels

and

MODE

switches

the

wsec/div.

OFF

position.

Readjust

the

Triggering

Level

control

obtain

stable

display.

Notice

that

the

Type

3A74

switches

between

channels

and

only

(see

Fig

2-2c).

Each

channel

conducts

for

about

usec

and

then

cut

off

while

the

other

channel

conducts

for

equal

time.

The

sampling

Fig.

2-2.

Chopped-mode

operation.

rate

for

each

channel

now

about

250

kc.

2-3

Operating

Instructions

—

Type

3A74

GENERAL

OPERATION

Any

the

four

amplifier

channels

can

used

independ-

ently

setting

the

appropriate

MODE

switch

the

NORM.

the

INV.

position

and

connecting

the

signal

observed

the

appropriate

input.

The

following

discussion

applies

equally

each

channel.

Signal

Connections

The

signal

displayed

applied

the

appropriate

input

connector

the

front

panel

the

Type

3A74.

For

best

results

here

are

some

precautions

you

should

observe

when

making

the

connections.

often

possible

make

signal

connections

the

Type

3A74

with

short-length,

unshielded

test

leads*.

This

particularly

true

for

high-level,

low-frequency

signals.

When

such

leads

are

used,

you

must

also

use

ground

con-

nection

between

the

Type

3A74

oscilloscope

chassis

ground

and

the

chassis

the

equipment

under

test.

Posi-

tion

the

leads

away

from

any

stray electric

magnetic

field

source

avoid

obtaining

erroneous

displays.

2. In

many

low-level

applications,

however,

unshielded

leads

are

unsatisfactory

for

making

signal

connections

be-

cause

unavoidable

pickup

resulting

from

radiating

fields.

prevent

unwanted

signal

pickup,

use

shielded

{coaxial}

cables.

sure

that

the

ground

conductors

the

*To

connect

test

leads

the

Type

3A74,

use

the

single

binding

post

adapters

(Tektronix

Part

No.

103-033}

supplied

with

the

cables

are

connected

the

chassis

both

the

oscilloscope

and

the

signal

source.

nearly

possible,

simulate

actual

operating

con-

ditions

the

equipment

under

test.

For

example,

the

equip-

ment

should

work

into

load

impedance

equal

that

which

will

see

actual

use.

Consider

the

effect

upon

the

equipment

under

test

due

the

input

circuit

the

Type

3A74.

The

input

circuit

can

represented

resistance

meg-

ohm

(+1%}

paralleled

capacitance

picofarads

(42%).

With

few

feet

shielded

cable,

the

capacitance

increased

considerably.

Where

the

effects

these

re-

sistive

and

capacitive

loads

will

affect

the

operation

the

device

under

test

distort

the

signal,

use

probe

the

manner

described

next.

Use

Probes

attenuator

probe

lessens

both

capacitive

and

resis-

tive

circuit

and

the

same

time

reduces

plug-in

sensitivity.

The

attenuation

introduced

the

probe

extends

the

vertical

deflection

factor

the

Type

3A74

that

high-

amplitude

signal

voltages

can

conveniently

displayed

the

crt.

When

applying

signals

the

probe,

consider

the

input

voltage

rating

the

probe.

When

making

the

ampli-

tude

measurement,

sure

multiply

the

observed

ampli-

tude

the

probe

attenuation.

unit.

tii,

—

‘

INCORRECT

ADJUSTED

CORRECTLY INCORRECT

(a)

Effect

compensation

with

60-cycie

calibrator

waveform.

—

—L

—

ev_ieot

lee

iot

—=

veseleeerleseeleetsetraetesetreelrteel

lospeteeeterelrertreteeeteteelrsteae!

—

beteedtteetHeeleeeeleeelie

HEHEHE

H+

HHH

HEE

HHH

QL QL

JL —L

—

olet

¢ £

INCORRECT

ADJUSTED

CORRECTLY

INCORRECT

{b)

Effect

compensation

with

1-ke

calibrator

waveform.

Fig.

2-3.

Probe

compensation

waveforms.

2-4

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