Tektronix 7a15 User manual

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1

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1

Ν

E3-rFt

U

CT1C>

Μ

ΜΑΝ

V

A

L

Se

r

ial

Nu

m

ber

Tektronix,

Inc

.

"

Ρ

.

Ο

.

Box

500

"

B

eave

r

ton,

O

r

egon

97005

"

Ph

o

n

eό

44-0161

"

Ca

b

les

:

Te

k

tr

onix

070-1044-00



670

WARRANTY

All

Tekt

r

onix

ίη 5tr

ιι r

η

eη

t5

are

war

r

a

n

te

d

against-

defective

m

ateriais

and

workmanship

for

one

year,

Tektronix

'transfo

r

m

ers,

manufactured

in'

o

u

r

plant,

are

wa

r

rante

d

f

or

t

h

e life

of the

instrument,

Any

μιι

estions

wit

h

respect

to

t

h

e

warranty,

mentioned

above

-s

h

oul

d

-

be

ta

k

e

n

up''

with

your

Tektronix

F

iel

d

Cnginee

ι

o

r

Repre'sentativ?

.

All

r

equests

for

re

p

ai

r

s

and

r

eplace

n

ι

ent

p

arts

should

b

e

di

r

ected

to

t

h

e

Te

k

t

ro

n

i

x

Fiel

d

Office

or

repr

esentative

in

your

area,'

This

p

roce

du

re

w

ill

assure

yo

u

the

fastest

possible

ser

v

ice

.

P

lease

include

the

instrument

Type

(or

P

art

R

lτι

r

r

i

b

er3

-

αη

dSer

i

al

o

r

M

o

d

el

Number

ινίΙ

h

all

requests for

parts

or

service

.

S

p

eci

f

icatio

n

s

an

d p

rice

change

privileges

reserve

d

.

Copyrig

h

t

0

1970

by Te

k

tro

n

ix,

I

nc

.,

B

ea

v

ertoη

,

-

O

r

egon

.

Printed

. i

n

t

h

e

U

nite

d

States of

America

.

All

rig

h

ts

rese

rve

d

.

Contents

of

t

h

is

publication

may n

ot

be

reprod

u

ce

d

i

n

any

form-without

permiss

i

on

of

t

h

e

co

p

yrig

h

t

owner

:,

:. ", .

TABLE

OF

CONTENTS

Page



Page

SECTION

1



SPECIFICATION



SECTION

5



PERFORMANCE

CHECK/CALIBRATION

Introduction



1-1



Introduction



5-1

Electrical

Characteristics



1-1



Test

Equipment

Required



5-1

Environmental

Characteristics



1-2



Short-Form

Procedure

and

Index



5-2

Physical

Characteristics



1-2



Performance

Check/Calibration

Procedure



5-4

SECTION 2



OPERATING

INSTRUCTIONS

General



2-1



SECTION

6



ELECTRICAL

PARTS

LIST

Installation



2-1



Abbreviations

and

Symbols

Front-Panel

Controls



2-1



Parts

Ordering

Information

First

Time

Operation



2-1



Index

of

Electrical

Parts

List

Control

Setup Chart



2-2

General

Operating

Information



2-4

Basic

Applications



2-5



SECTION 7



DIAGRAMS

AND

MECHANICAL

PARTS

ILLUSTRATIONS

SECTION 3



CIRCUIT

DESCRIPTION

Introduction



3-1

Block

Diagram

Description



3-1

Detailed

Circuit

Description



3-1

SECTION 4



MAINTENANCE

Introduction



4-1

Preventive

Maintenance



4-1

Troubleshooting



4-2

Corrective

Maintenance



4-5

Instrument

Repackaging



4-8

Mechanical

Parts

Illustrations

Instrument

Repackaging

SECTION

8



MECHANICAL

PARTS

LIST

CHANGE

INFORMATION

Mechanical

Parts

List

Information

Index

of

Mechanical

Parts

Illustrations

Mechanical

Parts

List

Accessories

Abbreviations

and

symbols

used

in this

manual

are

based

on

or

taken

directly

from

IEEE

Standard

260

"Standard

Symbols

for

Units",

MIL-STD-12B

and

other

standards

of

the

electronics

industry

.

Change

information,

if

any,

is

located

at

the

rear

of

this

manual

.

7

Α

15

Intro

d

uction



TABLE

1-1

(cost)

The

7

Α

15

vertical

amplifier

p

lug-in

unit

is

d

esigne

d

for

u

se

with

Tektronix

7000-series

Oscillosco

p

es

.

The



7A15

is

α



Characteristic



Performance

wi

d

eband

general

purpose

am

p

lifier,

with

t

he upper

fre-



Freq

uency

R

esponse



7500-series



7700-series

q

uency

limit

d

etermine

d

mainly

by

the

oscillosco

p

e

in



System

De

pend

ent



Oscillosco

pe



Oscillosco

p

e

which

it is

u

se

d

.

For

exam

p

le,

the

7

Α

15

use

d

with

t

he

7504



Up

p

er

Ban

dwidth



60

MHz



75

MHz

oscilloscope

will

h

ave

αSystem

Ban

dwidth

of

60

mega-

hertz

;

an

d

when

use

d

with

t

he

7704

oscilloscope,

the



(DC

Coupled)

system

bandwidth

will

be 75 megahertz

.

Α

P

OLARITY



Lower

Bandwi

d

th

switch

provides

α

means

of

inverting

the

d

is

p

lay

.

The

7

Α

15

can be

operate

d

in

any

p

lug-in

com

partment

of

the

7000-



(AC Cou

p

le

d

)

series

oscilloscopes

.



W

ithout

P

robe



2

h

ertz

or

less

This

instrument

will

meet

the

electrical

characteristics

listed

in

Table

1-1

following

complete

calibration

as

given

in

Section

5

.

The

p

erformance

check

proce

d

ure

given

in

Section

5p

rovi

d

es

α

convenient

method

of

checking

instru-

ment

p

erformance

without making

internal

ad

justments

.

SECTION

1

S

PE

CI

F

I

CA

ΤΙΟΝ

Ch

ange

information,

if

any,

affecting

t

h

is

section

will

be

found

at

t

h

e

rear

of

t

he

man

u

al

.

The

following

electrical

characteristics

are

valid

over

the



Capacitance



20

picofara

d

s

within

1

.5

p

icofarad

state

d

environmental

range

for

instruments

calibrate

d

at

an

ambient

tem

p

erature

of

+2

ρ°

ς

to

+30°C,

and

after

α

five



R

an

d

CP

roduct



W

ithin

1°/

ο

over

all

d

eflection

factor

minute

warmup

unless

otherwise

noted

.



settings

Deflection

Factor

Calibrate

d R

ange

GAIN

C

h

aracteristic

Gain

R

atio

Accuracy

Uncalibrate

d

(Variable)

TABLE

1-1

ELECTRICAL

C

HARACTERISTICS

P

erformance

5

mV/

d

iv

to

5 V/d

iv

;

10

ste

p

s

in

α

1,

2,

5

se

q

uence

.

W

ithin

2%

of

GAIN

ad

juste

d

at

10

mV/

d

iv

.

W

ith

Ρ

6053

P

robe

Ι

0

.2

h

ertz

or

less

Maximum

Input



500

V

(DC

+

Peak

AC)

.

AC

com-

Voltage



I

p

onent

1

kHz

or

less

.

In

p

ut

R

an

d

C

R

esistance



1

1

megohm

within

2°/

ο

7

Α

15

Maximum

Input



0

.5

nanoam

p

ere

or

less,

0

°

C

to

Gate

Current



~

+35°C

.

2

nanoam

p

ere

or

less,

+35

°

C

to

+50

°

C

.

Displaye

dN

oise



0

.06

division

or

less

at

5

mV/

d

iv

(Tangentially



measure

d

in

7700-series

oscillo-

Measured)

scope

.

DC

Drift

Drift

W

ith

Time

(Ambient Tem-

perature

and

Line

Voltage

Constant)

Continuously

variable

b

etween

cali-

brated

ste

p

s

;

exten

d

s

d

eflection

factor

to at least

12

.5

V/

d

iv

.

Short

Term



250



microvolts/minute



(P-P)



or

P

ermits

a

d

justment

of

d

eflection



0

.05

d

ivision

(whichever

is

greater)

factor

for

all

7000-series

oscillo-



in

any one

minute,

after

one

h

our

sco

p

es

.



warmu

p

.

Specification-7A15

Characteristic

Long

Term

Drift

With

Ambient

Tem-

perature

(Line

Voltage

Constant

TABLE

1-1

(cont)



TABLE

1-2

ENVIRONMENTAL

CHARACTERISTICS

Performance

250

microvolts/hour

(P-P)

or

0

.05

division

(whichever

is

greater)

in

any

one

hour,

after

one

hour

warmup

.

Refer

to

the

Specification

for

the

associated

oscilloscope

.

100

microvolt/degree

centigrade

or



TABLE

1-3

less

.



PHYSICAL

Fits

all

7000-series

plug-in

compartments

.

SECTION

2

OPERATING

I

NSTRU

CTIO

N

S

Ch

ange

information,

if

any,

affecting

this

section

will

b

e

found

at

t

h

e

rear

of

this

manual

.

General



ID

EN

TI

F

Y



Wh

en p

resse

d

,

d

eflects

trace

up-

The

7

Α

15

vertical p

l

u

g-i

n

units

o

p

erates

with α

Te

k

-



war

d

for

i

d

entification

andc

h

anges

tro

n

ix

7000-series

oscillosco

p

e

and

α7Β

__

series

time-

b

ase



CRT



rea

d

out



to



t

he



word

u

nit

to

form

αcomplete

oscillosco

pe

system

.

To

effectively



"ID

EN

TI

F

Y"

.

u

se

t

he 7

Α

15,

t

h

e

op

eration

an

d

ca

pab

ilities

of

t

h

e

instru-

ment

s

h

o

u

l

d

b

e

k

nown

.

T

h

is

section

d

escribes

th e

o

p

eration



P

O

L

A

R

ITY

of

t

he

front-panel controls,

gives

first-time

op

eration

and

general

o

p

erating

information,

and

lists

some

measurement



+

UP



Α

ρο

p

itive-

ce

s

α

signal

at

t

he

IN-

PU

T



ro

du

s



p

ositive

d

eflection

tec

h

ni

q

ues

using

t

he

am

p

lifie

r

.



on

t

he

CRT

.

Installat

i

on



INVER

T



Inverts

d

is

p

lay

.

Α

negative-going

The

7

Α

15

is

d

esigne

d

to

operate

in

α

vertical

plug-in



signal at

t

h

e

IN

PU

T

pr

odu

ces

α

compartment

of

Te

k

tronix

7000-series

oscillosco

p

es

.

F

or



positive

d

eflection

on

t

he

CRT

.

Χ

-

Υ

o

p

eration,

t

h

e

7

Α

15

may

also

be

installe

d

in

α

h

orizo

n

-

tal

p

lug-in

com

p

artment

(refer

to

th e

Oscilloscope

Instruc-



CO

UPL

I

NG

tion

Manual

for

i

n

formation

on

Χ

-

Υ

op

eration)

.

To

install



AC



Ca

p

acitively

cou

p

les

t

he

in

p

ut

sig-

t

he 7

Α

15

into

α

plug-in

compartment,

p

us

h

it

i

n u

ntil

it is



ηαΙ

to

t

he

vertical

am

p

lifier

.

seated

flus

h

against

t

he

front

p

anel

of

the

oscillosco

p

e

.

To

remove,

pull

the

release

latc

h

to

d

isengage

t

he 7

Α

15

from



GND



Disconnects

the

in

p

ut

signal

fr

o

m

t

h

e

oscillosco

p

e

.

Continue

to pull

t

he

release

latc

h

to

re-



t

he

am

p

lifier

andground

s

t

he

am

move

t

he u

nit

from

t

he

oscillosco

pe

.



p

lifier



in

p

ut

.



Allows



the



in

p

ut

coupling

ca

p

acitor

to

be ch

arged

to

t

he

DC

voltage

app

lied

to

the

IN-

FRONT

P

A

NEL

CO

NT

R

O

LS



PU

T

conn

ector

.

All

co

n

trols

re

qu

ire

d

for operation

of

t

he 7

Α

15

are

lo-



DC



T

he

signal

is

directly

cou

p

le

d

to

t

he

cate

d

on

t

h

e

front panel

of

t

h

e

unit

.

Α

brief

d

esc

r

i

p

tio

n

of



am

p

lifier

.

t

he

function

or

op

eration

of

t

he

front

p

anel

controls

follows

.

M

ore

d

etaile

d

infor

m

ation

is

given

und

er

General



GAIN



Screw

d

river

ad

j

ustment

p

ermits

O

p

erating

I

n

formation

.



A

dju

stment



cali

b

ration

of

d

eflection

factor

.

VO

L

TS/DI

V

Selects

calibrate

d

vertical

d

eflection

factor

from

5

m

V

/

d

iv

to

5

V

/

d

iv

in

α

1,

2,

5

se

quence

.

VA

RIA

BLE



P

rovides

uncalibrate

d

varia

b

le

d

e

(

VO

L

TS/DI

V

)



flection

factors

.

E

xten

d

s

t

he

h

ig

h

est

d

eflection

factor

to at least

12

.5

V

/

d

iv

.

P

us

h k

nob

in

an

d

re-

lease

to

activate

;

the

k

nob

moves

outwar

d

from

t

he

VO

L

TS/DI

V

control

w

h

en

activate

d

.

VA

R B

A

L



Screw

d

river

a

dju

stment

p

ermits

A

d

j

ustment



b

alancing

of

the

am

p

lifier

for

minimum

trace

s

h

ift

w

h

ile

rotating

t

he

VA

R

IA

BLE

control

.

I

N

PU

T



BN

C

connecto

r

for

applying

exter-

Connector



ηαΙ

signals

.

General

FIRST-TIME

O

PER

ATIO

N

7

Α

15

Wh

en

s

h

ippe

d

from

t

he

factory,

t

he 7

Α

15

h

as

been

cali-

P

OSITIO

N

Controls

vertical p

ositio

n

of

oscillo-



br

ate

d

to

meet

the

s

p

ecifications

listed

in

Section

1

and

is

sco

pe

d

is

p

lay

.



rea

d

y

to

be

u

se

dwith an

in

d

icator

oscilloscope

.

Operating

Instructions-7A15

T

h

e

following

ste

p

s

d

emonstrate

the

basic

op

eration of

t

he co

n

trols

of

t

he 7

Α

15

.

It

is

recommen

d

e

d

t

h

at

t

h

is

pr

o-

cedure

be

followe

d

com

p

letely

for

familiarization

with

t

he

instrument

.

O

p

eration

of

t

he

oscilloscope

an

d

time-base

unit

is

d

esc

r

i

bed

in

t

he

instr

u

ction

ma

nu

al

for

t

h

ese

units

.

Setu

p

I

n

formation

1 . I

n

sert

t

he 7

Α

15

i

n

to

α

vertical

p

lug-in

com

p

artment

of

α

7000-series

oscilloscope

.

2

.

Insert

α

713--series

time-

b

ase

unit

i

n

to

α

h

o

r

izo

n

tal

p

lug-in

com

partment

.

2-2

3

.

Set

t

he

controls as

follows

:



Fig

.

2-1

.

Oscilloscope

dis

p

lay

w

h

e

nch

ec

k

ing

amplifier

Gain

.

7

Α

15

(

L

eft

V

ert

com

p

artment)

P

OSITIO

N



Midrange

POLARITY

+UP

VO

L

TS/DI

V

10

m

V

CO

UPL

I

N

G

DC

VA

R

IA

BLE

CA

L

IN

713511

(

Β

H

oriz

com

p

artment)

L

evel/Slo

p

e



Ce

n

tere

d on p

ositive

slo

p

e

Triggeri

ng

Mo

de



Ρ

-

Ρ

A

u

to

Coup

ling



AC

Source



I

n

t

Time/Div



1

ms

Variable

(Time/Div)



Cal

In

M

agnifier



Χ

1

ΒDelay

Mode



I

ndepen

d

ent

P

osition



Mid

range

7504

(Indicator

Oscillosco

p

e)

V

ertical

Mo

de



L

eft

Horizontal

Mode



Β

Β

Intensity



CCW

Calibrator



1

kH

z,

40

mV

Β

Trigger

So

u

rce



L

eft

Vert

4

.

Connect

t

he

oscilloscope to

αp

ower

sou

r

ce

w

h

ic

h

meets

t

he

voltage

an

d

frequency

re

q

uiremen

ts of

t

h

e

oscil-

loscope

power

su

pp

ly

.

7

.

Co

nn

ect

t

he

Cali

b

rator

ou

t

pu

t

to

t

h

e 7

Α

15

INPU

T

conn

ector

.

8

.

C

h

ec

k

t

he

C

R

T

d

is

p

lay

for

fo

u

r

d

ivisions

of

vertical

deflection

(see

Fig

.

2-1)

.

If

necessary, ad

j

ust

t

he

fro

n

t

p

anel

GAI

N

for

fo

u

r

d

ivisio

n

s

of

vertical

d

eflection

.

9

.

P

ress

the

ID

E

NTI

F

Y

b

utton

an

dch

ec

k

t

h

at

the d

is-

play

moves

u

p

ward

about

0

.3

divisions

.

Also ch

ec

k

t

h

at

the

rea

dout

information

on the

C

RT

is

replace

d by the

wo

r

d

"ID

EN

TI

F

Y"

.

10

.

P

ress

and

release

the

VA

R

IA

BLE

control

to

its

out-

ward

p

ositio

n

.

Turn

t

h

e

VA

R

IA

BLE

control

fully

cou

nter-

cloc

k

wise,

and ch

ec

k

for

1

.6

d

ivisions

or

less

d

is

p

lay

am

p

li-

tude

.

P

ress

t

he

VA

R

IA

BLE

control

to

the

CA

L

IN

p

osition

.

11

.

C

hange

t

he

VO

L

TS/DI

V

to

0

.1

V,

Calibrator

Volts

to

0

.4

V

an

d

t

h

e

Triggeri

n

g

Sou

rce

to

Ext

.

Connect

the

Calibrator

out

p

ut

t

h

ro

ugh α"

Τ

" connector

to

the

time

b

ase

Ext

Trig

In

an

d

t

he 7

Α

15

I

NPU

T

con

nector

.

Set the

P

O

L

A

R

ITY

switc

h

to

I

NVER

T

to

d

is

p

lay

t

h

e

opp

osite

polarity

of

t

he

s

q

uare

wave

.

T

h

is

com

p

letes

t

he

basic

op

erating

p

rocedure

for

t

he

7

Α

15

.

I

nstrument

operations

not

ex

p

lai

ned

h

ere

or

op

era-

tions

w

h

ic

hneed

furt

h

er

exp

lanation

are

d

iscusse

d

und

er

General

O

p

erating

I

n

formatio

n

.

5

.

Turn

t

he

oscillosco

pe

p

ower

on

and

allow

about 5



CO

NTR

O

L

S

E

T

UP

C

H

A

R

T

minutes

warmu

p

.

Figure

2-2

s

h

ows

t

h

e

front panel

of

t

h

e

7

Α

15

.

T

h

is

c

h

art

can be

re

p

ro

ducedan

d

use

d

as

α

front

p

a

n

el

record

for

6

.

A

d

vance

the

Β

Intensity

until

α

free-r

u

nning

trace

is



sp

ecial

meas

u

rements,

a

pp

lications

or p

roce

du

res,

or

it

may

observe

d

.

A

d

j

ust the

P

ositio

n

controls to center

t

he t

r

ace



b

e

used

as

α

training

ai

d

for

familiarization

with

t

h

is

instru-

οη

t

he

C

RT

.



ment

.

7

Α

15

T

E

ST

S

E

T-

UP

C

H

A

R

T

σ

»

οί

~

ορρν

POSITION

V

A

R

B

A

L

INPUT

imp

20

pF

ΤΕΚΤ

R

ΟΝΙ

%®

7

Α

75

P

OLA

R

ITY

Π

+

UP

-/I

NVER

T

V

A

R

IA

BLE

(CA

L

IN)

V

O

L

TS/DI

V

Ί-

Ί

AC

GN

D

υ

DC

AMPL

IF

I

ER

F

ig

.

2-2

.

7

Α

15

control

set

u

pch

art

.

O

p

erating

Instructions-7A15

2-

3

O

pe

r

ati

ng Instructions-7A15

G

ENER

A

L

O

PER

ATI

NG

I

NF

O

RM

ATIO

N



T

h

e

GND

p

osition

is

also

use

d

to

p

re-c

h

arge

t

h

e

coup

ling

ca

p

acitor

to

t

he

average

level

of

t

h

e

signal

app

lie

d

to

t

h

e

Signal

Con

n

ection



I

NPU

T

connector

.

T

he

p

re-c

h

arge

network

allows

t

h

e

i

npu

t

In

general,

prob

es

offer

the

most

convenient

means

of



coupling

ca

p

acitor

to

c

h

arge to

t

h

e

DC

source

voltage

level

con

necting

α

signal

to

t

he

in

pu

t

of

t

he 7

Α

15

.

Tek

tronix



whe

n

t

h

e

CO

UPL

I

N

G

switc

h

is

set

to

GN

D

.

p

ro

b

es

are

s

h

iel

ded

to

p

r

event

p

ic

k

up

of

elect

r

ostatic

inter-

fere

n

ce

.

Α

10

Χ

atten

u

ator

p

robe

offers

α

h

ig

h

inp

u

t

im-



T

he

p

edance

an

d

allows

t

h

e

circuit

un

d

er test to

op

erate

very



procedure

for

using

th

is

feature

is

as

follows

:

close

to

normal

operati

ng

con

d

itions

.

H

owever,

α

10

Χ

p

robe

also

attenuates

t

h

e

inp

u

t

signal

ten

times

.



1

.

Before

connecting

the

signal

con

taining

α

DC

com-

p

onent

to

t

he 7

Α

15

INPU

T,

set

the

CO

UPL

I

NG

switc

h

to

GND

.

T

h

en

connect

t

h

e

signal

to

the

I

NPU

T

connector

.

In

h

ig

h

-fre

qu

ency a

pp

lications

re

q

uiring

maximum

over-

all

b

andwid

t

h

,

use

α

coaxial

ca

b

le

terminate

d

at

both end

s

in

t

h

e

ch

aracteristic

imp

e

dance

of

the

ca

b

le

.

To

maintain

t

h

e

h

ig

h

-fre

q

uency

c

h

aracteristics

of

t

he

a

pp

lie

d

signal,

use

h

ig

h

-

q

uality

low-loss cable

.

R

esistive

coaxial

attenuators

can be

u

se

d

to

min

imize

reflections

if

t

h

e

a

pp

lie

d

signal

h

as

s

u

ita

b

le

am

p

litu

de

.

In

p

ut

Cou

p

ling

T

h

e

AC-G

N

D-DC

lever

switc

h

allows

α

c

h

oice

of

in

p

ut

co

u

p

ling

.

T

he

ty

pe

of

d

is

p

lay

d

esire

d

d

etermines

t

h

e

mo

d

e

of

in

pu

t

co

u

pling

u

se

d

.

T

h

e

DC

p

osition

can be

use

d

for

most

a

pp

lications

.

However,

if

t

he

DC

com

ponent

of

t

h

e

sig

n

al

is

muc

h

larger

t

han

t

he

AC

com

p

one

n

t,

t

h

e

AC

p

osition

will

p

robably

p

rovi

d

eα

better

d

is

p

lay

.

DC

coupling

s

h

ould

be

use

d

to

d

isplay

AC

signals b

elow about 2 h

ertz

an

dsqu

a

r

e

waves

containing

low-frequency

com

ponen

ts,

as

t

hey

will

b

e

attenuate

d

in

t

he

AC

p

osition

.

Ι

η

the

AC

p

osition,

t

he

DC

com

p

onent

is

bloc

kedby

α

ca

p

acitor

in

t

h

e

in

p

ut

circ

u

it

.

T

h

e

low-frequency

res

p

onse

in

t

he

AC

position

is

abou

t

2

h

ertz

(-3

dB

point)

.

Th

ere-

fore,

some

low-frequency

attenuation

can

be

exp

ecte

d

near

t

h

is

fre

q

uency

limit

.

Distortion

will

also

app

ear

in

s

q

uare

waves

w

h

ic

h h

ave

low-fre

q

uency

com

p

onents

.

2-

4

2

.

Allow

a

bo

u

t

two

seconds

for

the

coup

ling

ca

p

acitor

to

ch

arge

.

3

.

R

eset

t

h

e

CO

UPL

I

N

G

switc

h

to

AC

.

T

he

trace

(

d

isplay)

will

remain

on

t

h

e

scree

n

and

t

he

AC

com

p

on

ent

of

t

he

signal

can

b

e

meas

u

re

d

in

th

e

normal

manner

.

H

ig

h

-level

low-frequency

signals

can

b

e

con

n

ecte

d

direc-

tly

to

the

7

Α

15

I

NPU

T

conn

ector

with sh

ort

unsh

ielded



Deflection

F

actor

leads using

α

BN

C

to

Banana

J

ack

A

da

p

ter

.

T

h

is

met

ho

d

wor

k

s

best

for

signals

below about

one

k

ilo

h

ertz

an

d

d

eflec-



T

he

amou

nt

of

vertical d

eflection

p

ro

du

ce

d by

α

signal

is

tion

factors

above

one

volt/

d

ivisio

n

.

Wh

en

t

h

is

met

hod

is



d

etermine

d by

t

he

sig

n

al

am

p

litu

d

e,

t

h

e

atten

u

ation

factor

u

se

d

,

esta

b

lis

hα

common

ground

between

t

he 7

Α

15

and

of

t

he

p

ro

b

e

(if

any),

t

he

setting

of

t

he

VO

L

TS/DI

V

switc

h

t

he

e

q

uipment

un

d

er test

(common

groundp

rovi

d

e

dby



and

t

he

setting

of

the

VA

R

IA

BLE

control

(if

co

n

trol

is

i

n

line

cord

s

is

usually

ina

deq

uate)

.

Attem

p

t

to

p

osition

t

h

e



t

he outwar

d p

ositio

n

)

.

T

h

e

calib

r

ate

d

d

eflection factors

in-

lea

d

s

away from

any

source

of

interfere

n

ce to

avoi

d

errors



dicated

b

y

t

h

e

VO

L

TS/DI

V

switc

happ

ly

only

w

h

en

t

he

in

t

he d

is

p

lay

.

If

interfere

n

ce

is

excessive

with

uns

h

ielded



VA

R

IA

BLE

control

is

in

t

he inward

(CA

L

IN)

p

osition

.

leads,

use α

coaxial

cable

or

α

p

ro

b

e

.

T

he

VA

R

IA

BLE

control

p

rovides

uncali

b

rated

vertical

d

eflection

b

etween

t

he

calibrate

d

settings

of

t

he

VO

L

TS/

DI

V

switc

h

,

an

dexten

d

s

the

maximu

m

d

eflection

factor to

at

least

12

.5

volts/

d

ivision

.

T

h

e

GAI

N

control,

α

fro

n

t-

p

anel

screwd

river

ad

j

ustment,

sets

t

he

gai

n

of

the

7

Α

15

in

t

he 10

m

V

/

d

iv

p

osition

of

t

he

VO

L

TS/DI

V

switc

h

.

T

he

gain

calibration

of

t

he

unit

s

hou

l

d

be ch

ec

k

ed

for acc

u

racy

p

rior

to

ma

k

i

n

g

critical

measure-

ments,

using

eit

h

er

t

he

oscillosco

p

e

cali

b

rator

ou

t

p

ut or

α

sta

nd

ar

d

am

p

lit

ude

calibrator

.

If

a

d

j

ustment

is

necessary,

t

he

GAI

N

s

h

oul

d b

e a

d

ju

ste

d with

t

he

VO

L

TS/DI

V

switc

h

set

to

10

m

V

.

V

ariable

B

alance

To

c

h

ec

kan

d

/o

r

a

dju

st

the

VA

R

B

A

L,

p

roceed

as

fol-

lows

:

1

.

Set the

CO

UPL

I

N

G

to

GND

an

d

a

d

just

the

time-

b

ase

T

he

GND

position

p

rovi

d

es

α

ground

reference

at

t

he



controls

for

α

free-running

trace

.

am

p

lifier

in

p

ut

.

T

h

e

signal

a

pp

lied

to

t

h

e

I

NPU

T

connector

is

p

resente

d

wit

hα

one

mego

h

m

load,

w

h

ile

the

am

p

lifier

in

pu

t

is

grounded

.

T

h

is

eliminates

the

nee

d

to

externally



2

.

P

ress

and

release

t

h

e

VA

R

IA

BLE

control

to

its

o

u

t-

gro

und

the

I

NPU

T

to

esta

b

lis

hα

DC

gro

u

n

d

reference

.



war

d p

osition

.