Tektronix 2A61 User manual

INSTRUCTION

ANI

WAL

Serial

Number

27.3

2.3

Tektronix,

Inc.

S.W.

Millikan

Way

©.

Box

500

Beaverton,

Oregon

97005

Phone

644-0161

Cables:

Tektronix

070-0328-01

367

”

Type

2A61

DiSMEAY

TIME

MunTiV(SRe7

RESET

OUT

olvitess

’

COMMAND

MEMoRIE*

VOLTMETER

ite

PARTS

Lie

‘Cu

buUe

Tare

SEk

Ser

FOR

SERIES

MODEM.

General

Information

The

Type

2A61

high

sensitivity

differential

amplifier

designed

for

use

with

all

Tektronix

560-series

Oscilloscopes.

The

amplifier

provides

calibrated

deflection

factors

from

pV/division

mV/division

1-2-5

sequence.

The

upper

and lower

cutoff

frequencies

the

amplifier

are

adjustable.

addition,

line

frequency

notch

filter

can

switched

minimize

signals

the

power

line

fre-

quency

region.

SECTION

Type

2A61

CHARACTERISTICS

trace

restorer

pushbutton

returns

the

trace

driven

off

the

CRT

graticule

area

large

transient.

front

panel

control,

the

Input

Selector,

can

connect

the

amplifier

input

internal

common

mode

signal

for

check

common

mode

rejection;

ground

the

inputs

the

amplifier

for

no-signal

reference

display;

select

either

Input

select

minus

The

following

characteristics

apply

over

ambient

tem-

perature

range

0°

50°

Warm-up

time

reach

specified

performance

minutes

25°

5°

Characteristic

Performance

Requirement

Supplemental

Information

Deflection

Factor

0.01

mV/div

mV/div,

=5%

GAIN

AD§J

control

properly

set

and

VARI-

ABLE

CALIB.

Steps

1-2-5

sequence.

VARIABLE

range

>2.5

Maximum

Bandwidth

<0,06

>0.3MHz,

mV/div

<0.1

>0.1

MHz,

0.01

mV/div

FREQ

RESPONSE

switch

(High

Frequency

—3dB

point)

Selectable

fixed

steps.

Within

30%

indicated

frequency

300-100

kHz

(de-

pending

upon

mV/div

switch

setting},

kHz,

6kHz,

600

and

Hz.

Risetime

(10-90%}.

(Based

cutoff

fre-

quency

within

+30%

front-panel

fre-

quency

indication.)

kHz

4.5

8.3

kHz

600

0.45

0.83

8.3

FROM

switch

(Low

Frequency

—3

point)

Selectable

fixed

steps.

Within

+30%

indicated

frequency

0.06

0.1

(de-

pending

upon

mV/div

switch

setting},

0.6

Hz,

6Hz,

60Hz

and

600

Hz.

Decay

Time

Constant

(Based

cutoff

fre-

quency

within

+30%

front-panel

fre-

quency

indication).

600

0.21

0.37

2.1

3.7

21.0

37.0

0.6

0.21

0.37

POSITION

control

Range

divisions

Short

Circuit

Noise

<3.5

(RMS),

referred

input,

(0.01

mV/

div

and

maximum

frequency

response).

2220

peak

peak.

Input

GND.

Grid

Current

—B

input

grid

current,

10nA

(nano-

amperes)

max.

Input

and

Megohms,

+1%,

paralleled

approxi-

mately

100

For

each

input

ground

Line

Filter

Attenuation

>50:1

(with

60Hz

filter}

Insertion

Loss

<15%

and

above

kHz

(with

filter)

Filters

for

50Hz

and

400Hz

available

(60

standard)

Common

Mode

Rejection

Ratio

50,000:1

below

kHz,

peak

common

mode

sine-wave

input.

MILLIVOLTS/DIV

switch

set

.05

Maximum

Common-Mode

Voltage

Input

+5V

A—B

mode

1-1

Characteristics—Type

2A61

Characteristic

Performance

Requirement

Supplemental

Information

Dynamic

Range

+15

divisions

minimum,

about

the

zero-

input

level,

with

the

VARIABLE

control

CALIBRATED

For

other

settings

the

VARIABLE,

the

dynamic

range

reduced

proportion

the

gain,

and

on-screen

distortion

may

ap-

pear.

Differential

Input

Bias

+0.1

maximum

May

superimposed

the

input

sig-

nal

with

change

instrument

perform-

ance.

Overload

Recovery

Time

minutes

maximum

{with

+0.1

bias)

recovery

period

least

minutes

should

allowed

after

applying

maximum

allowable

bias,

before

any

measurement

attempted.

Balance

BAL

adjustable

for

trace

shift

with

Inputs

ground

operation

MILLIVOLTS/DIV

Control

throughout

its

range

1-2

Type

2A61

SECTION

OPERATING

INSTRUCTIONS

Introduction

This

section

gives

brief

description

front

panel

con-

nectors,

controls

and

signal

overload

indicator.

INPUT

CONNECTOR

The

INPUT

connector

designed

mate

with

the

low

noise

input

cable

supplied

with

the

instrument.

connections

are

shown

the

front

panel.

The

INPUT

SELECTOR

five

posi-

tion

rotary

switch

that

selects

the

method

coupling

and

Inputs

the

amplifier.

A—B:

Connects

the

Amplifier

and

—B

inputs

for

differential

oper-

ation.

GND:

Connects

the

Amplifier

ground

without

grounding

and

—B

Inputs.

INPUT

SELECTOR

CM:

Connects

the

Amplifier

com-

mon

volt

peak

sine-wave

power

line

frequency

for

com-

mon-mode

rejection

check.

Connects

the

side

the

Ampli-

fier

the

Input

and

connects

the

—

side

the

Amplifier

ground.

—B:

Connects

the

—

side

the

Amplifier

the

Input

and

connects

the

side

the

Amplifier

ground.

NOTE

signal

applied

the

Input

will

displayed

the

same

polarity,

positive

upward,

with

the

INPUT

SELECTOR

switch

the

position,

The

same

signal

applied

—B

Input

will

displayed

inverted

with

the

INPUT

SELECTOR

switch

the

—B

position.

MILLIVOLTS/DIV.

Selects

calibrated

deflection

factors

when

VARIABLE

the

CALIB.

position.

MILLIVOLTS/DIV.

Provides

continuously

variable

de-

VARIABLE

flection

factor

least

2.5

times

the

setting

MILLIVOLTS/DIV.

switch.

CAUTION

When

the

VARIABLE

control

the

minimum

gain

(fully

counterclockwise)

position

and

the

POSI-

TION

control

either

end

its

range, severe

signal

distortion

may

appear

the

screen

for

cer-

tain

settings

the

MILLIVOLTS/DIV.

control.

©i

BAL.

Front

panel

screwdriver

adjustment.

Adjusts

for

minimum

trace

shift

the

MILLIVOLTS/DIV.

switch

rotated

throughout

its

range.

DIFF

BAL.

Front

panel

screwdriver

adjustment.

Sets

optimum

common-mode

rejec-

tion.

LINE

FREQUENCY

With

FILTER

switch

set

IN,

signals

FILTER

power

line

frequency

are

attenu-

ated

approximately

dB,

The

chart,

Fig.

2-1,

shows

—3

points

the

Filter.

FREQ

RESPONSE

FROM:

(Black

knob)

Sets

the

approxi-

mate

lower

3dB

down

frequency

limit.

See

Chart,

Fig.

2-1.

TO:

(Red

knob)

Sets

the

approximate

upper

down

frequency

limit.

See

Chart,

Fig.

2-1.

GAIN

ADJ.

Screwdriver

adjustment

for

changing

the

gain

the

Type

2A61

com-

pensate

for

differences

deflection

factors

different

indicator

units.

POSITION

Provides

vertical

positioning

the

display.

Clockwise

rotation

moves

the

trace

up.

Counterclockwise

rota-

tion

moves

the

trace

down.

TRACE

RESTORER

The

red

button

the

center

the

POSITION

knob.

Returns

the

trace

its

original

position

the

trace

driven

off

the

CRT

screen

signal

transient

control

operation.

Neon

indicator

lights

whenever

the

display

driven

beyond

the

range

the

POSITION

control.

GENERAL

OPERATING

INFORMATION

Signal

Connections

Whenever

possible,

make

all

signal

connections

the

Type

2A61

INPUT

connector

with

the

low-noise

input

cable

supplied

with

the

instrument.

signal

connections

are

made

the

Type

2A6]

with

leads

other

than

those

supplied,

sure

use

shielded

cable.

When

making

single-signal

measurements

sure

establish

common

ground

between

the

chassis

the

device

under

test

and

the

Type

2A61.

The

common

ground

provides

reference

for

the

voltage

measurements.

ground

con-

nection

required

differential

measurements,

but

one

should

maintained

safety

measure.

2-1

Operating

Instructions—Type

2A61

‘A,

100

MIN.

SENSITIVITY

“s,

10k

6°

100

Fig.

2-1

Frequency

response.

f/f

\'|

NSN

0.1

Hertz

Ny.

9%.

‘upB

peypiqioy

spo

sjeqped

—10

0.01

Make

certain

that

any

signal

carrying

leads

are

positioned

away

from

stray

electrostatic

magnetic

fields

that

might

induce

voltages

into

the

input

circuit

the

Type

2A61.

This

‘is

important

because

the

Type

2A61

low-level,

high

gain

system

which

stray

signal

millivolt

less

can

cause

serious

measurement

error.

The

circuits

under

test

should

operate

closely

possible

normal

operating

conditions.

The

amount

that

the

input

circuit

the

Type

2A61

imposes

the

circuit

under

test

must

considered.

This

especially

important

when

the

circuit

under

test

offers

high

source

impedance.

Each

input

the

Type

2A61

has

resistance

MQ,

+1%,

shunted

about

100

pF.

Due

the

capacitive

component

the

input

circuit

the

Type

2A61,

the

circuit

increases

with

frequency.

For

example,

the

input

impedance

the

Type 2A61

with

input

frequency

3kHz

about

530kQ

but

with

input

frequency

kHz, input

impedance

decreases

about

k0.

important

note

that

shielded

cable

adds

capacit-

ance

the

input

circuit

the

Type

2A61.

42-inch

length

509

coaxial

cable

with

BNC

connectors,

such

Tek-

tronix

part

number

012-0057-00,

will

add

about

110

the

input

capacitance.

Setting

the

GAIN

ADJ

Control

The

GAIN

ADJ

control

should

checked

and/or

adjusted

each

time

the

Type

2A61

used

with

new

different

indicator

unit,

and

occasionally

during

regular

operation,

insure

reliability

measurement.

set

the

GAIN

ADJ

contro!

proceed

follows:

Plug

the

Type

2A61

into

the

left-hand

plug-in

compart-

ment

Tektronix

560-series

Oscilloscope

and

tighten

the

securing

knob.

Turn

the

power

and

allow

about

minutes

for

the

system

reach

operating

temperature.

Free

run

the

oscilloscope

sweep

2ms/diy

and

con-

nect

suitable

patch

cord

between

the

oscilloscope

calibrator

and

the

terminal

the

Type

2A61

INPUT

connector.

Set

the

oscilloscope

calibrator

for

(0.05

volt}

input.

Set

the

Type

2A61

front

panel

controls

follows:

INPUT

SELECTOR

MILLIVOLTS/DIV

VARIABLE

CALIB

FREQ

RESPONSE

FROM

.06

MHz

FILTER

OUT

Check

for

exactly

five

major

graticule

divisions

deflection.

the

deflection

not

correct

set

the

GAIN

ADJ

control

for

five

major

divisions.

Use

the

Type

2A61

POSI-

TION

control

necessary

keep

the

display

centered.

Setting

the

DIFF

BAL

Control

The

DIFF

BAL

control

(differential

balance)

should

set

occasionally

during

regular

operation

the

TYPE

2Aé6l,

particularly

prior

making

critical

differential

measurements.

Either

two

methods

may

used

set

the

DIFF

BAL

control.

The

first

the

methods

described

uses

the

Operating

Instructions—Type

2A61

internal

volt

peak

line

frequency

source.

The

second

uses

external

volt

peak

signal.

set

the

DIFF

BAL

control

the

first

method,

proceed

follows:

Method

Plug

the

Type

2A61

into

the

left-hand

plug-in

compart-

ment

Tektronix

Type

560

Series

oscilloscope

and

tighten

the

securing

knob.

Turn

the

oscilloscope

power

and

allow

about

minutes

for

the

system

warm

up.

Set the

Type

2A61

front

panel

controls

follows:

INPUT

SELECTOR

MILLIVOLTS/DIV

VARIABLE

CALIB

FREQ

RESPONSE

FROM—.6

TO—.1

MHz

FILTER

OUT

Trigger

the

oscilloscope

time

base

from

the

line

and

set

the

sweep

rate

ms/div.

Position

the

trace

vertically

the

graticule

center

line,

using

the

Type

2A61

POSITION

control

and/or

the

Trace

Restorer

button.

Adjust

the

DIFF

BAL

control

for

minimum

vertical

deflection.

One

major

division

deflection

with

the

mV/DIV

switch

set

indicates

common

mode

rejec-

tion

ratio

50,000:1.

the

division

requirement

for

50,000:1

rejection

ratio

cannot

met

adjusting

the

DIFF

BAL

control,

the

Type

2A61

should

recalibrated.

See

Section

Method

Plug

the

Type

2A61

into

the

left-hand

plug-in

compart-

ment

560-series

Oscilloscope

and

tighten

the

securing

knob.

Turn

the

oscilloscope

power

and

allow

minutes

for

the

system

reach

operating

temperature.

Set the

Type

2A61

front

panel

controls

follows:

INPUT

SELECTOR

A—B

MILLIVOLTS

/DIV

VARIABLE

CALIB

FREQ

RESPONSE

FROM

.06

MHz

FILTER

OUT

Apply

volts

peak

signal

(preferably

the

signal,

signal

similar

the

signal

rejected)

the A

and

INPUT

terminals

the

Type

2A61.

Set the

oscilloscope

time

base

sweep

rate

con-

sistent

with

frequency

the

signal

applied.

Set

the

oscillo-

scope

triggering

for

stable

display.

Position

the

trace

necessary

with

the

Type

2A61

POSITION

and/or

Trace

Restorer

button.

Adjust

the

Type

2A61

DIFF

BAL

control

for

minimum

vertical

deflection.

One

major

division

deflection

with

the

MILLIVOLTS/DIV

indicates

common

mode

rejec-

tion

ratio

50,000:1

with

volt

peak

signal

applied.

2-3

Operating

Instructions—Type

2A61

(B)

Signal

applied

—INPUT.

(C)

Resultant

display.

Fig.

2-2.

Typical

CRT

displays

showing

differential

rejection

common

mode

signal.

Resultant

waveform

(C)

displays

the

difference

signals

and

Setting

the

DC BAL

Control

The

BAL

control

may

need

set

occasionally

dur-

ing

regular

operation

the

Type

2A61.

Proper

balance

minimizes

trace

shift

when

rotating

the

MILLIVOLTS/DIV

switch

from

one

position

another.

set

the

BAL

control,

proceed

follows:

Plug

the

Type

2A61

into

the

left-hand

plug-in

compart-

ment

Tektronix

560-series

Oscilloscope

and

tighten

the

securing

knob.

Turn

the

oscilloscope

power

and allow

about

minutes

for

the

system

reach

operating

tempera-

ture.

Free

run

the

oscilloscope

time

base

sweep

rate

ms/div.

Set

the

Type

2A61

front

panel

controls

follows:

INPUT

SELECTOR

GND

MILLIVOLTS/DIV

VARIABLE

CALIB

FREQ

RESPONSE

FROM

FILTER

OUT

Vertically

position

the

trace

the

CRT

graticule

center

line

using

the

Type

2A61

POSITION

control.

Reset

the

MILLIVOLTS/DIV

switch

.01.

Adjust

the

BAL

control

return

the

trace

the

graticule

center

line.

2-4

Reset

the

MILLIVOLTS/DIV

switch

and

repeat

steps

and

until

there

trace

shift

while

rotating

the

MILLIVOLTS/DIV

switch

between

and

.01.

Fig.

2-3.

Example

measurement

situation

which

CMRR

only

1000:1.

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