Tektronix 7A16A Manuale utente

INSTRUCTION

MANUAL

7A16A

AMPL.IFIER

Serial Number

Tektronix,

P.O. Box

500

...

Bea

rton, Oregon 97005

one:

644·

0161

...

Cable

Tektronix

070

-1378-00 Scans bv Outsource·Options

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WARRANTY

All

TEKTRONIX

struments are warranted against

defecti

materials and workmanship for

one

year. Any

estions with respect

the warranty should be

taken

with your TEKTRONIX Fie

Engin

represen

tat

ive.

All requests for repairs and replacement p

arts

should be

directed

the

TEKTRONIX Fie

Office

representative

area.

Thi

s will assure you

the

fastest

ssi

ble

service. Please include the instrument

Type

Number

Number and Serial

Number

with all requests for

part

service.

Specifications and price change privileges reserved.

1972

by Tektronix, Inc., Beave

on, Oregon.

Printed

the

United

States

Contents

this publication may

not

reproduced in any

form

without

permission

Tektronix, Inc.

U.S.A. and foreign TEKTRONIX

products

covered by U.S.

and foreign

patent

s and

r p

ate

s pending.

TEKTRONIX is a registered trademark

Tektroni

x, Inc.

Scans

fIov

OlltsOIl'C~-OpliOlls

:::>

7A16A

TABLE

CONTENTS

Page

SECTION'

SPECIFICATION

Introduction

1·'

Electrical Characteristics

'·1

Environmental Characteristics

'·2

Physical Characteristics 1·2

SECTION 2 OPERATING INSTRUCTIONS

Installation 2·1

Function

Controls and

Connectors

2·'

Basic Operation

2·2

General Operating Information

2·2

Applications

2·3

SECTION 3 CIRCUIT DESCRIPTION

Block Diagram Description 3·1

Detailed Circuit Description

3·'

SECTION 4 MAINTENANCE

Preventive Maintenance 4·1

Troubleshooting 4·1

Corrective Maintenance

4·3

SECTION 5 CALIBRATION

Performance Check 5·1

Test

Equipment

Required 5·1

Short

Form Procedure

5·2

Calibration Procedure

5·3

Balance

5·4

Gain

5·4

Compensation

5·5

Bandwidth and Risetime

5·6

SECTION 6 ELECTRICAL PARTS LIST

Abbreviations and Symbols

Parts Ordering Information

SECTION 7 DIAGRAMS AND CIRCUIT BOARD ILLUSTRATIONS

Symbols

and Reference Designators

SECTION 8 MECHANICAL PARTS LIST

Mechanical Parts List Information

ndex

Mechanical Parts Illustrations

Mechanical Parts List

Scans

Oulsource-Opt;ons

7A16A

Ii"OsmON

IWIOWlOTll

IMQ INPUT

20Pf

.~,

tf"

Fig. 1·

7A16A

Amplifier

Plug·in.

Scam bv

Olltsoll,c~.Options

ArtekMedia

Digitally signed by ArtekMedia

DN: cn=ArtekMedia, o=ArtekMedia.com, ou,

[email protected], c=US

Date: 2008.11.16 17:47:24 -06'00'

..-

Section

1-7A16A

SPECIFICATION

Introduction

The 7A16A Amplifier Plug-In Unit

a wide-bandwidth

amplifier designed for use with TEKTRON

7000-Series

Oscilloscopes. The 7A16A can be operated

any plug·in

compartment of 7000·Series Oscilloscopes. Readout

encoding and trace identify functions are provided

readout equipped oscilloscopes.

Characteristics

Deflection

Factor

Calibrated Range

Accuracy

Uncalibrated (VARIABLE)

Gain Range

Frequency

Response

Bandwidth

AC Coupled (Lower Bandwidth Limit)

MHz Bandwidth

Step

Response

Risetime

MHz

Bandwidth

Risetime

Maximum

Input

Voltage

DC Coupled

AC Coupled

TABLE 1·1

ELECTRICAL

Performance

Requirements

5 mV/div

5 V/div,

steps in a 1·2·5

sequence.

Within

indicated

deflection

factor

with

GAIN adjusted

mV/div.

Continuously

variable

between

calibrated steps;

extends

deflection

factor

least

12.5

V/div.

With 7400-Series With 7500-Series

MHz

With 7700-Series With 7900·Series

150

MHz

225

MHz

less.

With 7400-Series With 7500·Series

5.9

3.9

With 7700-Series With 7900·Series

2.4

ns 1.6 ns

Supplemental

Information

Permits

adjustment

deflection

factor

for

calibrated

operation

with

all 7000-Series main·

frames.

MHz, ±3 MHz.

maximum.

250

V (DC + peak AC); A

component

500

pop

maximum,

1 kHz

less.

500

V (DC + peak AC); A

component

500

pop

maximum,

1 kHz

less.

1-1

Specification-7

16A

TABLE 1-1 (cont)

Characteristics

Performance

Requirements

Input

Rand

Resistance

Capacitance

Overdrive Recovery

Time

DC Drift

Drift

with

Time

(Ambient

Temp

and

Line Voltage

Constant)

Drift

with

Temperature

(Line

Voltage

Constant)

TABLE 1-2

ENVIRONMENTAL

CHARACTERISTICS

Refer

the

specifications

for

the

associated oscilloscope. Size

Weight

1-2

Supplemental

Information

±2%.

±0.5

pF.

0.1 ms

less

recover

within

one

division

after

removal

overdrive signal

+75

div

-75

div regardless

overdrive signal

duration.

0.02

div

less in

anyone

minute

after

one

hour

warmup.

Not

than

0.02

div/"C.

TABLE 1-3

PHYSICAL

Fits all 7000-Series plug-in

compartments.

0.9

1.9

Ibs.

Section

2-7A16A

OPERATING

INSTRUCTIONS

General

effectively use

the

16A,

the

operation

and

capabilities

the

instrument

must

known.

This

section

describes

front-panel

control

functions,

general

information

signal

input

connections,

and

other

subjects

that

pertain

various

measurement

applications.

Installation

The

7A16A

calibrated

and

ready

for

use as received. It

can be installed in

any

compartment

TEKTRONIX

7000-Series Oscilloscopes,

but

intended

for

use

primarily

vertical plug·in

compartments.

install, align

the

upper

and

lower rails

the

16A

with

the

oscilloscope

tracks

and

insert

the

plug-in.

The

front

panel will be flush

with

the

front

the

oscilloscope

when

the

plug-in

inserted,

and

the

latch

the

bottom-left

corner

will be in place against

the

front

panel.

remove

the

7A16A,

pull

the

latch (which

inscribed

with

the

unit

identification

16A")

and

the

plug-in will

unlatch.

Continue

pulling

the

latch

slide

the

7A16A

out

the

oscilloscope.

Functions

Controls

and Connectors

Front

Panel

INPUT

Connector

Provides signal

connection

the

amplifier.

AC-GND-DC

Switch

Selects signal

input

coupling

mode.

AC:

The

component

the

signal

coupled

the

input

while

the

component

blocked.

DC:

Both

and

components

the

signal

coupled

the

amplifier

input.

GND:

Grounds

the

amplifier

input

while

maintaining

the

same

load

the

INPUT

connector.

Provides a

path

for

pre-charging

the

coupling

capacitor

(this

feature

pro-

tects

both

the

16A

and

the

source

generator

from

possible over-voltage

conditions).

POSITION

Controls

position

the

trace.

IDENTIFY

Pushbutton

Deflects

trace

about

0.3

division

for

trace

identification.

instruments

with

readout,

also replaces

readout

with

the

word

"10

ENTI

FY".

VOL

TS/DIV

Switch

Selects

calibrated

deflection

factors

from

/div

5 V/div;

steps

in a 1-2-5

sequence.

VARIABLE

(VOL

TS/DIV)

Provides

continuously

variable

uncalibrated

settings

be·

tween

calibrated

steps.

Extends

the

deflection

factor

12.5

volts/division

more.

GAIN

Adjustment

Screwdriver

adjustment

permits

calibration

deflection

factor.

POLAR

ITY

Switch

Provides a

means

inverting

the

display.

+UP: A positive-going signal

the

INPUT

connector

deflects

the

CRT

display

upward.

INVERT:

A positive-going signal

the

INPUT con-

nector

deflects

the

CRT

display

downward.

BAN

DWI

DTH

Switch

Provides a

means

limiting

the

upper

bandwidth.

FULL:

Allows

the

7A16A

operate

full

rated

bandwidth.

MHz: Reduces

the

upper

bandwidth

the

7A16A

about

MHz.

2-1

Scans

Oulsource-Options

Operation-7

16A

BASIC

OPERATION

General. This

procedure

demonstrates

the

use

the

connectors

and

controls

the

7A16A,

while

the

same

time

providing a means of checking

the

basic

operation

the

instrument.

Preliminary

Setup.

Install

the

16A

into

any 7000-

series oscilloscope vertical

compartment

and

set

the

oscillo-

scope

VERTICAL

MODE and

TRIGGER

SOURCE

the

proper

settings.

Install a 7-series time-base

unit

into

a horizontal

compartment

and set

the

oscilloscope HOR IZONTAL

MODE

the

proper

setting.

Set

the

time-base

unit

sweep rate

one-millisecond per division

and

set

the

triggering

mode

AUTO.

Procedure

Set

the

7A16A

AC-GND-DC switch

GND

and

position

the

trace

the

center

the

graticule.

Set

the

VOLTS/DIV switch

10 mV

and

apply a

mV 1 kHz square-wave signal from

the

oscilloscope

CALIBRATOR

the

7A16A

INPUT

connector.

Set

the

AC-GND-DC switch

and check

for

a four-division

display.

3. Set

POLARITY

switch

INVERT

and

check

that

the

displayed signal

inverted as

compared

its appear-

ance

step

Set

the

AC-GND-DC switch

and

check

that

the

trace

centered

the

CRT

graticule.

GENERAL

OPERATING

INFORMATION

Signal Connections

general, probes

offer

the

most

convenient

means

connecting a signal

the

input

the

7A16A.

A lOX

attenuator

probe

offers a high impedance and allows

the

circuit

under

test

perform very close

normal

operating

conditions.

2-2

The

TEKTRONIX

P6053

probe

equipped

with a

readout

coding ring which

connects

circuit

the

amplifier unit. This

automatically

corrects

the

readout

displayed on

the

CRT

the

actual deflection

factor

the

tip

the

probe.

This

probe

recommended

for use with

the

16A

and

an oscilloscope

equipped

with

readout.

The

TEKTRON

P6054

probe

electrically identical

the

P6053

but

intended

for use with systems

not

equipped

with

readout.

For

information

refer

the

Tektronix,

Inc. catalog.

Vertical Gain Check and Adjustment

check

the

gain

the

7A16A,

set

the

VOLTS/DIV

switch

and

connect

mV, 1 kHz signal from

the

oscilloscope

calibrator

the

Input

connector.

The

vertical deflection should be

exactly

four

divisions. If

not,

adjust

the

front

panel GAIN

for

exactly

four

divisions.

Input

Coupling

The

AC-GND-DC switch allows a choice

input

coupling

methods.

The

type

display desired

and

the

applied signal will

determine

the

coupling

use.

The

coupling position can be used

for

most

applications. For AC signals with frequencies below

about

(10 Hz with a lOX

probe),

and

square waves whose

low-frequency

components

are

important

the

display, it

necessary

use

coupling

obtain

a satisfactory

presentation.

the

AC coupling position

the

component

the

signal

blocked by a

capacitor

the

input

circuit. The AC

coupling position provides

the

best

display

signals with a

component

much larger

than

the

component.

The

pre-charge

feature

should be used

when

there

a possibility

having a residual charge

the

input

capacitor

the

opposite

polarity

the

intended

input,

and

when

the

algebraic sum

the

com

bination

charges may be greater

than

the

maximum

input

limitations

the

amplifier.

use this

feature,

first

set

the

coupling switch

GND,

then

connect

the

probe

the

circuit

and

wait

about

two

seconds

for

the

coupling

capacitor

charge,

set

the

coupling switch

AC.

The

GND position provides a

ground

reference

the

input

the

amplifier

without

externally grounding

the

Input

connectors.

However,

the

signals

connected

the

inputs are

not

grounded,

and

the

same

load

presented

the

signal source.

®I

Scans

Outsource-Options

VOLTS/DIV and

VARIABLE

The

amount

deflection

produced

by a signal

determined

the

signal

amplitude,

the

attenuation

factor

the

probe,

the

setting

the

VOL

TS/DIV

switch,

and

the

setting

the

VARIABLE

Control.

Calibrated

deflection

factors

represented

the

setting

the

VOL

TS/

DIV switch apply

only

when

the

VARIABLE

control

the

CAL position (pushed-in).

The

VAR IABLE

control

provides variable

uncalibrated

settings

between

the

calibrated

steps

the

VOL

TS/DIV

switch.

With

the

VARIABLE

control

out

set

fully

counter-

clockwise

the

uncalibrated

deflection

factor

extended

least 2.5 times

the

attenuator

setting.

applying a

cal

ibrated

voltage

source

the

INPUT

connector,

any

specific

deflection

factor

can

be set

within

the

range

the

VARIABLE

control.

Polarity Switch

The

POLAR ITY switch provides a

means

inverting

the

displayed signal. With

the

POLAR ITY

set

+UP, a

positive-going signal

the

INPUT

produces

upward

deflection

the

CRT

display. With

the

POLAR ITY

set

INVERT,

a positive-going signal will

produce

downward

deflection

the

CRT

display.

Trace Identification

When

the

IDENTIFY

button

pressed,

the

trace

deflected

upward

about

0.3

division

identify

the

16A

trace.

This

feature

particularly

useful

when

multiple

traces are displayed

the

CRT.

mainframes

with

readout,

it also replaces

the

deflection

factor

readout

with

the

word

"IDENTIFY".

APPLICATIONS

General

The

following

information

describes

the

procedures

and

techniques

for making

measurements

with a 7A

16A

and

the

associated

TEKTRON

oscilloscope

and

time-base. These

applications

are

not

described

detail, since each applica-

tion

must

adapted

the

requirements

the

individual

measurements.

This

instrument

can also be used for

many

applications

which are

not

described

this

manual.

Contact

your

local

TEKTRON

Field Office

represent-

ative for assistance

making

specific

measurements

with

this

instrument.

Peak-to-Peak Voltage Measurements (AC)

make

peak-to-peak voltage

measurements,

use

the

following

procedure:

1. Apply

the

signal

the

nput

connector.

Operation-7

16A

Set

the

Coupling switch

AC.

NOTE

For low-frequencv signals below about

hertz, use

the

position to prevent attenuation

the

signal.

Set

the

VOL

TS/DIV

switch

display

about

five

vertical divisions

the

waveform.

Set

the

time-base Triggering

controls

for a stable

display.

Set

the

Time

Base

a sweep rate which displays

several cycles

the

waveform.

Turn

the

7A16A

POSITION

control

the

lower

portion

the

waveform coincides

with

one

the

graticule

lines

below

the

center

horizontal

line,

and

the

top

the

waveform

within

the

viewing area. With

the

time

base

Position

control,

move

the

display so

one

the

upper

peaks lies near

the

center

vertical line (see Fig. 2-1).

6. Measure

the

divisions

vertical

deflection

peak

peak. Check

that

the

VARIABLE

control

the

CAL

position.

NOTE

This technique can also be used to make measure-

ments between two points on the waveform, rather

than peak to peak.

Vertical

deflection

Position

center

vertical

line

\ \

~--

---)

1 /

Jr"\.

\ 7

\ j

Fig. 2-1. Measuring

the

peak·to-peak

voltage

waveform.

2-3

Scans bv

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