Tektronix 7a15a User manual

•

I.

I

•

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••

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I·

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INSTRUCTION

MANUAL

Seriol

Number

·

__

7A15A/AN

AMPLIFIER

Tektronix,

Inc

. • P. O . 80K

500

• B

eo

ver

lon,

Oregon

97005

•

Phone

6<14

-0 161 •

Cobles

: Tektr

onix

070-1210-00 871

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WARRANTY

All

Tektronilt inltfUments are warranted against

defective material, and workmanship for

one

year.

Any

questiom

with

respect

to

the

warranty.

mentioned above, should be taken

up

with

your

Tektroni)( Field

En

l

;"

'!:.t.llf..!'

,

p,·

e.e'll'J

~~

e.

____

_

All

requests rep.irs and parts

should

to-th

e

Tektr

onix Office

representitii"e in

your

-.

This

pr~rt"l1

~

you

the

fatest

pos$ible service. P

JMee

include the

Number) .iKI Serial

or

Specifications

ar

price change

pri\/i'

~es

reserved.

Copyright ® 1971

by

Tektronix, Inc., Beaverton,

Oregon. Printed in the United

Sta

tes of America. All

rights reserved.

Co

nt

ents

of

thi

s

publication

may

not

be

reproduced

in arl V

form

without

permission

of

th

e

co

pyright

owner

.

U.S.A. and foreign Tektronix

products

covered

by U.S.

and

foreign

patent

s

and/or

pat

ents

pending.

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7A15A/7A15AN

TABLE

OF

CONTENTS

SECTION 1 SPECIFICATION

Introduction

Electrical Characteristics

Environmental Characteristics

Physical Characteristics

SECTION 2 OPERATING INSTRUCTIONS

SECTION 3

SECTION 4

Installation

Controls

and

Connectors

Basic

Operation

General Operating

Information

Applications

CIRCUIT DESCRIPTION

I

ntrod

uction

Block Diagram Description

Detailed Circuit Description

MAINTENANCE

Preventive Maintenance

Troubleshooting

Corrective Maintenance

REV.

B, OCT.

1974

Page

1-1

1-2

2-1

2-2

2-3

3-1

4-1

4-3

SECTION 5 CALIBRATION

Introduction

Test

Equipment

Required

Performance

Check

Procedure

Calibration

Procedure

SECTION 6 ELECTRICAL

PARTS

LIST

Abbreviations

and

Symbols

Parts Ordering

Information

SECTION 7 DIAGRAMS AND CIRCUIT BOARD

I

llUSTRA

TlONS

Symbols

and

Reference Designators

SECTION 8 MECHAN

ICAl

PARTS

LIST

Mechanical Parts List

Information

Index

of

Mechanical Parts

Illustrations

Mechanical Parts List

Page

5-1

5-2

-

.-

--

•

~-

I·

~

. " -•

0

"""'fiT

__

•

••

-

-"-

•

-

~

~.

I

·~

. "

..

•

1fIVt'" _ e

--

-•

Fig. 1-1.

7A1

5A .

nd

7

A1

5AN Am

pl

if..... •

••

7A15

A/AN

® •

ArtekMedia

Digitally signed by ArtekMedia

DN: cn=ArtekMedia, o=ArtekMedia.com, ou, [email protected],

c=US

Date: 2008.11.16 17:36:11 -06'00'

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Introduction

SECTION

1

SPECIFICA

TION

7A15A/7A15AN

7A

15A/7

A15AN

can

be

operated

in

any

plug-in

compart-

ment

of

7000-Series oscilloscopes.

The

7A

15A/7

A15AN Amplifier plug-in

unit

is

a wide

band amplifier designed

for

use with

Tektronix

7000-Series

oscilloscopes.

The

7A

15A

and

7A15AN

,are

electrically

identical

except

that

encoding capabilities and an

"IDENTIFY"

function

are provided in

the

7A15A.

The

following electrical characteristics are

val

id

over

the

stated

environmental range

for

instruments

calibrated

at

an

ambient

temperature

of

+20°C

to

+30°C,

and

after

a five

minute

warmup

unless otherwise

noted.

-Characteristic

Deflection

Factor

Calibrated Range

Deflection

Factor

Accuracy

Uncalibrated (VAR IABLE)

X10

GAIN

Frequency

Response

Upper

Bandwidth

Frequency

(at

-3

dB)

X1 (System

Dependent)

X10

Low-Frequency Response

(Lower

-3

dB point)

AC (Capacitive)

coupled

®

TABLE 1-1

ELECTRICAL

Performance

Requirement

5 mV/Div

to

10

V/Div,

11

steps in a 1-2-5

sequence

Within

2%

of

indicated

deflection

factor

with GAIN adjusted

at

10

mV/Div

Continuously

variable

between

calibrated

steps;

extends

deflection

factor

to

at

least

25

V/Div

Increases amplifier gain by a

factor

of

10

within 10%, decreasing

deflection

factor

to

500

JlV

/D

iv

With 7900-series With nOO-series

80

MHz

75

MHz

With 7500-series With 7400-series

60

MHz

50

MHz

10

MHz

10Hz

or

less

without

probe

1 Hz

or

less

with

probe

Supplemental

Information

,-,

I

Specification-7

A

15An

A

15AN

TABLE

1-1

-Characteristic Performance

Req

Supplementalln/o,m.';on

.-

(cont)

uirement

-

Maximum

Input

Voltage

===F===========

I

DC

Coupled

AC Coupled

II

nput

Rand

C

Resistance 1

Mn

±

2%

Capacitance Approximately 20.0

pf

RC

Tolerance

Overdrive Recovery Time

-

TABLE

1-2

ENVIRONMENTAL

CHARACTERISTICS

IRefer

to

the specifications

for

the associated oscilloscope I

1-2

250 V (DC +

Peak

AC); AC component

500 V

P-P

maximum, 1 kHz or

less

500 V (DC +

Peak

AC);

AC component

500 V

P-P

maximum, 1 kHz or

less

Within ± 1% between all deflection

factors.

0.1

ms

or

less

to

recover

to

within

one

division after removal

of

overdrive signal

of

up

to

+75 divisions

to

-75

divisions

regardless

of

overdrive signal duration

TABLE

1-3

I

PHYSICAL

.1

---r----_

Size

Fits all 7000-series plug·in compartments

Weight 1 pound 13 ounces (0.82 kilogram)

®

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7A15A/7A15AN

SECTION

2

OPERA

TING

INSTRUCTIONS

General

To

effectively use

the

7A

15A/7

A

15AN,

the

operation

and capabilities

of

the

instrument

must

be

known.

This

section

dE!scribes

front-panel

control

functions,

general

information

on

signal

input

connections,

and

other

subjects

that

pertain

to

various

measurement

applications.

Installation

The

7A15A/7A15AN

is

calibrated

and ready for use as

received. It can be installed

in

any

compartment

of

Tek-

tronix

7000-Series Oscilloscopes,

but

is

intended

for

use

primarily

in

vertical plug-in

compartments.

To

install, align

the

upper

and lower rails

of

the

7A15A/7A15AN

with

the

oscilloscope

tracks

and insert

thE!

plug-in.

The

front

panel

will be flush with

the

front

of

the

oscilloscope

when

the

7A15A/7A15AN

is

fully inserted,

and

the

latch

at

the

bottom-left

corner

will be

in

place against

the

front

panel.

To

remove

the

7A15A/7Al!5AN,

pull

on

the

latch

(which

is

inscribed

with

the

unit

identification

"7

A

15A"

or

"7A15AN")

and

the

7A15A/7A15AN

will

unlatch.

Continue

pulling

on

the

latch

to

slide

the

7A15A/7A15AN

out

of

the

oscilloscope.

VOLTS/DIV

VARIABl.E

FRONT

PANEL

CONTROLS

AND

CONNECTORS

Selects calibrated

deflection

factors

from

5 mV/Div

to

10

V/Div;

11

steps

in a 1-2-!i sequence.

Provides

continuously

variable un-

calibrated

settings

between

calibrated steps.

Extends

the

deflec-

t

ion

factor

range

to

25

volts/

division

or

more.

GAIN

Adjustment

Screwdriiver

adjustment

permits

calibration

of

deflection

factor.

MAG

I

nput

Connector

AC-GND-DC

INVERT:

A positive-going signal

at

the

Input

connector

deflects

the

CRT

display

downward.

Provides

means

of

decreasing

the

deflection

factor.

Xl:

Deflection

factor

is

that

selected

by

VOL

TS/DIV

and

VARIABLE

controls.

Xl0

REDUCED

BANDWIDTH:

Deflection

factor

is

one-tenth

of

the

value selected by

the

VO L

TS/

DIV and

VARIABLE

controls.

Provides signal

connection

to

the

amplifier.

Selects signal

input

coupling

mode.

AC:

The

AC

component

of

the

signal

is

coupled

to

the

amplifier

input,

while

the

DC

component

is

blocked.

DC:

Both

AC and

DC

components

of

the

signal are

coupled

to

the

amplifier

input.

GND:

Grounds

the

amplifier

input

while maintaining

the

same load for

the

input

signal. Provides a charge

path

for

the

AC

coupling

capacitor

to

pre-charge

the

input

circuit

before

switching

the

input

to

AC.

I

POLARITY

I·

Provides means

of

inverting

the

display.

POSITION

IDENTIFY

(7A15A

Only)

Controls

position

of

the

trace.

Deflects

trace

about

0.3

division

for

trace

identification.

In

instruments

with

readout,

also replaces

readout

with

the

word

"IDENTIFY".

I ®

+UP: A positive-going signal

at

the

Input

connector

deflects

the

CRT

display

upward.

2-1

Operating I

nstructions-7

A

15A/J

A15AN

BASIC OPERATION

General. This

procedure

demonstrates

the

use

of

the

connectors

and

controls

of

the

7A15A/7A15AN,

while

at

the

same

time

providing a means

of

checking

the

basic

operation

of

the

instrument.

Preliminary Setup. Install

the

7A

15A/7

A15AN

into

any

·1000-series oscilloscope vertical

compartment

and

set

the

oscilloscope

VERTICAL

MODE and

TRIGGER

SOURCE

to

the

proper

settings.

Install a 7-series time-base

unit

into

a

horizontal

compartment

and

set

the

oscilloscope

HORIZONTAL

MODE

to

~he

proper

setting.

Set

the

time-base

unit

to

a

sweep rate

of

one-millisecond per division and

set

the

triggering

mode

to

AUTO.

Procedure

1.

Set

the

7A15A/7A15AN

AC-GND-DC switch

to

GND and

position

the

trace

to

the

center

of

the

graticule.

2.

Set

the

VOL

TS/DIV

switch

to

10 mV and apply a

40

mV 1 kHz square-wave signal from

the

oscilloscope CALI-

BRATOR

to

the

7A15A/7A15AN

INPUT

connector.

Set

the

AC-GND·DC switch

to

DC

and

check

for a four-division

display.

3.

Set

POLARITY

switch

to

INVERT

and

check

that

the

displayed signal

is

inverted as

compared

to

its appear-

ance

in

step

2.

4.

Set

the

AC-GND-DC switch

to

AC

and

check

that

the

trace

is

centered

on

the

CRT

graticule.

5.

Set

the

oscilloscope

CALIBRATOR

to

4 mV and

the

7A15A/7A15AN

MAG switch

to

X10.

Check

for a four-

division display.

6.

(7A15A

Only) Press

the

7A15A

IDENTIFY

button,

check

that

the

display moves

upward

approximately

0.3

division

and

the

readout

(if so

equipped)

reads

"IDENTIFY".

GENERAL

OPERATING

INFORMATION

Signal Connections

In general,

probes

offer

the

most

convenient

means

of

connecting

a signal

to

the

input

of

the

7A15A/7A15AN.

A

10X

attenuator

probe

offers a high

impedance

and allows

2-2

I

the

circuit

under

test

to

perform

very close

to

normal I

operating

conditions.

•

The

Tektronix

P6053

probe

is

equipped

with

a

readout

I

coding

ring which

connects

to

a

circuit

in

the

amplifier

unit.

This

automatically

corrects

the

readout

displayed

on

the

CRT

to

the

actual

deflection

factor

at

the

tip

of

the

probe.

This

probe

is

recommended

for use

with

the

7A

15A

and an oscilloscope

equipped

with

readout.

The

Tektronix

P6054

probe

is

electrically identical

to

the

P6053

but

is

intended

for

use

with

systems

not

equipped

with

readout.

For

more

information

refer

to

the

Tektronix

I

nco

catalog.

Vertical Gain Check

and

Adjustment

To

check

the

gain

of

the

7A15A/7A15AN,

set

the

VOLTS/DIV

switch

to

10

mV and

connect

a

40

mV,

1 kHz

signal

from

the

oscilloscope

calibrator

to

the

Input

connec-

tor.

The

vertical

deflection

should

be

exactly

four

divisions.

If

not,

adjust

the

front

panel GAIN

for

exactly

four

divi-

sions.

Input

Coupling

The

AC-GND-DC switch allows a

choice

of

input

coup-

ling

methods.

The

type

of

display desired and

the

applied

signal will

determine

the

coupling

to

use.

The

DC

coupling

position

can be used for

most

applica-

tions.

For

AC signals with frequencies below

about

30

Hz

(10Hz

with

a 10X

probe),

and

square

waves whose low-

frequency

components

are

important

to

the

display, it

is

necessary

to

use

DC

coupling

to

obtain

a satisfactory

presentation.

In

the

AC coupling

position

the

DC

component

of

the

signal

is

blocked

by

a

capacitor

in

the

input

circuit.

The

AC

coupling

position

provides

the

best

display

of

signals

with

a

DC

component

much

larger

than

the

AC

component.

The

pre-charge

feature

should

be used

when

there

is

a possibility

of

having a residual charge

on

the

input

capacitor

of

the

opposite

polarity

to

the

intended

input,

and

when

the

algebraic sum

of

the

combination

of

charges may be greater

than

the

maximum

input

limitations

of

the

amplifier.

To

use this

feature,

first

set

the

coupling

switch

to

GND,

then

connect

the

probe

to

the

circuit

and

wait

about

two

seconds

for

the

coupl

ing

capacitor

to charge,

set

the

coupling

switch

to

AC.

I

The GND

position

provides a

ground

reference

at

the

I

input

of

the

amplifier

without

externally

grounding

the

Input

connectors.

However,

the

signal

connected

to

the.

input

is

not

grounded,

and

the

same

DC

load

is

presented

I

to

the

signal

source.

REV.

S, OCT. 1974 I

I

I.

I

VOLTS/DIV,

VARIABLE

and MAG Controls

The

amount

of

deflection

produced

by a signal

is

deter-

mined

by

the

signal

amplitude,

the

attenuation

factor

of

the

probe,

the

setting

of

the

VOL

TS/DIV

switch,

the

setting

of

the

VARIABLE

Control,

and

the

setting

of

the

MAG

switch.

Calibrated

deflection

factors

represented

by

the

setting

of

the

VO L

TS/D

IV

switch

apply

only

when

the

VARIABLE

control

is

in

the

CAL

position

(fully clock-

wise)

and

when

the

MAG switch

is

set

to

Xl.

I

The

VARIABLE

control

provides variable

uncalibrated

settings

between

the

calibrated

s,teps

of

the

VOL

TS/D

IV

switch.

With

the

VARIABLE

control

set

fully

counter-

clockwise

and

the

VOL

TS/DIV

switch

set

to

5 volts/div,

the

uncalibrated

deflection

factor

is

extended

to

at

least

2.5

times

the

attenuator

setting. By applying a

calibrated

voltage source

to

the

Input

connector,

any

specific deflec-

tion

factor

can be

set

within

the

range

of

the

VARIABLE

control.

The

MAG switch increases

the

VOLTS/DIV

switch

sensitivity

by

a

factor

of

10

when

in

the

Xl0

position.

Thus,

with

the

MAG switch

set

to

Xl

0 and

the

VO L

TS/

[)

IV switch

set

to

5 mV

/d

iv,

the

deflection

factor

is

extended

to

500}J..V/div.

The

MAG switch also

effects

a

circuit

in

the

7A

15A

which

corrects

the

readout.

With

the

MAG switch

set

to

X10,

the

bandwidth

of

the

amplifier

is

reduced.

Refer

to

specifications

in

Section

1.

Polarity Switch

I.

The

POLAR ITY

switch

provides a

means

of

inve~ting

the

displayed signal. With

the

POLAR ITY

set

to

+ui'

a

positive-going signal

at

the

INPUT

produces

an

up

ard

I

deflection

of

the

CRT

display. With

the

POLAR ITY s t

to

INVERT,

a positive-going signal will

produce

a downvVard

deflection

of

the

CRT

display. !

Trace Identification

(7A15A

only)

I

When

the

IDENTIFY

button

is

pressed,

the

tract'

is

deflected

.upward

about

0.3

division

to

identify

the

7A

5A

trace. ThiS

feature

IS

particularly

useful

when

mul iple

traces are

displayed

on

the

CRT.

In

mainframes

with

rfad-

out,

It

also replaces

the

deflection

factor

readout

with

i

the

lIVord

"IDENTIFY".

i

I

When using a 100X

readout

coded

probe

such as a

P~09

(Tektronix

Part No.

010-0264-01),

the

7A

15A

encodin

of

CRT

readout

is

incorrect

for

a

number

of

VOL

TS/

IV

settings. These

incorrect

readings

occur

with

the

AG

switch

in

the

1X gain

position

as follows:

Actual:

50

V,

10V,

20V

and

lS,

should

read:

500mV,

100V,

200V

land

lkV.

If

a

100X

probe

is

to

be used

with

the

7A154.

at

these sensitivities, in a

CRT

readout

mainframe,

it migh be

preferable

to

defeat

the

probe

coding

and

multiply

the

plug-in

VOL

TS/DIV

by a

factor

of

100

as

in

non-c

ded

operation.

Possible means

for

achieving

this

is;

use a P6

09

I

Tektronix

Part No.

010-0170-00

(no

readout

connect

r),

defeat

the

probe

coding

connection

in

the

7A

15A

by dis-

•

connecting

R48,

defeat

the

CRT

readout

entirely

for

the

7A

15A

by unsoldering

the

A37

and

837

cable

connections

I

between

the

readout

EC

board

and

the

mainframe

EC

board.

I

REV.

B, OCT.

1974

Operati

ng I

nstructions-7

A

15A/7

A

15AN

APPLICATIONS

General

The

following

information

describes

the

procedures

and

techniques

for

making

measurements

with

a 7A

15A/

7A

15AN

and

the

associated

Tektronix

oscilloscope

and

time-base.

These

applications

are

not

described

in

detail,

since each

application

must

be

adapted

to

the

requirements

of

the

individual

measurements.

This

instrument

can also be

used

for

many

applications

which

are

not

described

in

this

manual.

Contact

your

local

Tektronix

Field

Office

or

representative

for

assistance

in

making specific measure-

ments

with

this

instrument.

Peak-to-Peak Voltage Measurements (AC)

To

make

peak-to-peak

voltage

measurements,

use

the

following

procedure:

1.

Apply

the

signal

to

the

I

nput

connector.

2.

Set

the

Coupling

switch

to

AC.

NOTE

For low-frequency signals

below

about

30

hertz, use

the

DC

position to prevent attenuation

of

the signal.

3.

Set

the

VOLTS/DIV

switch

to

display

about

five

vertical divisions

of

the

waveform.

4.

Set

the

time-base Triggering

controls

for

a

stable

display.

Set

the

Time

Base

to

a sweep

rate

wh ich displays

several cycles

of

the

waveform.

5.

Turn

the

7A15A/7A15AN

POSITION

control

so

the

lower

portion

of

the

waveform

coincides

with

one

of

the

graticule lines

below

the

center

horizontal

line, and

the

top

of

thl~

waveform

is

within

the

viewing area. With

the

time

base

Position

control,

move

the

display so

one

of

the

upper

peaks lies near

the

center

vertical line (see Fig. 2-1).

6. Measure

the

divisions

of

vertical

deflection

peak

to

peak.

Check

that

the

VARIABLE

control

is

in

the

CAL

position.

NOTE

This technique can also

be

used to

make

measure-

ments

between two points on the waveform, rather

them

peak to peak.

7. Multiply

the

distance

measured

in

step

7

by

the

VO L

TS/D

IV

switch

setting.

I

nclude

the

attenuation

factor

of

the

probe

if

used.

EXAMPLE:

Assume

that

the

peak

to

peak

vertical

deflection

is

4.5

divisions using a lOX

attenuator

probe,

and

the

VOL

TS/DIV

switch

is

set

to

1 V.

2-3

Tektronix 7a15a User manual

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