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fektronix

7613/R7613

STORAGE

OSCILLOSCOPE

OPERATORS

INSTRUCTION

MANUAL

Copyright

©

1972

Tektronix,

Inc.

All

rights

reserved.

Contents

of

this

publication

may

not

be

reproduced

in

any

form

without

the

written

permission

of

Tektronix,

Inc.

Products

of

Tektronix,

Inc.

and

its

subsidiaries

are

covered

by

U.S.

and

foreign

patents

and/or

pending

patents.

TEKTRONIX,

TEK,

SCOPE-MOBILE,

and

are

registered

trademarks

of

Tektronix,

Inc.

TELEQUIPMENT

is

a

registered

trademark

of

Tektronix

U.K.

Limited.

Printed

in

U.S.A.

Specification

and

price

change

privileges

are

reserved.

INSTRUMENT

SERIAL

NUMBERS

Each

instrument

has

a

serial

number

on

a

panel

insert,

tag,

or

stamped

on

the

chassis.

The

first

number

or

letter

designates

the

country

of

manufacture.

The

last

five

digits

of

the

serial

number

are

assigned

sequentially

and

are

unique

to

each

instrument.

Those

manufactured

in

the

United

States

have

six

unique

digits.

The

country

of

manufacture

is

identified

as

follows:

B000000

=

Tektronix,

Inc.,

Beaverton,

Oregon,

USA

100000

Tektronix

Guernsey,

Ltd.,

Channel

Islands

200000

Tektronix

United

Kingdom,

Ltd.,

London

300000

Sony/Tektronix,

Japan

700000

Tektronix

Holland,

NV,

Heerenveen,

The

Netherlands

OPERATING

INSTRUCTIONS

Operating

Checkout

Controls

and

Connectors

Simplified

Operating

Instructions

General

Operating

Information

SPECIFICATIONS

Electrical

Environmental

and Physical

System

Specification

RACKMOUNTING

INSTRUCTIONS

Dimensional

Drawing

1-3

1-4,

1-5

1-8

1-10

2-1

2-6

2-7

3-4

The

TEKTRONIX

7613

Storage

Oscilloscope

is

a

solid-state,

light-weight

instrument

designed

for

general

purpose

applications.

This

instrument

has

three

plug-in

compartments

that

accept

TEKTRONIX

7000-Series

plug-in

units

to

form

a

complete

measurement

system.

The

two

plug-in

compartments

on

the

left

are

for

vertical

preamplifiers.

The

right

plug-in

compartment

is

connected

to

the

horizontal

deflection

system.

Electronic

switching

is

used

to

connect

either

vertical

plug-in

to

the

vertical

deflection

system.

It

is

possible

to

alternately

display

the

vertical

signals

(multi-trace

display).

The

flexibility

of

this

plug-in

feature

and

variety

of

plug-in

units

available

allow

this

system

to

be

used

for

many

measurement

applications.

This

instrument

features

a

large

screen,

8

X

10

division

display;

each

division

equals

0.9

centimeter.

The

Cathode

ray

tube

(CRT)

provides

small

spot

size

and

a

fast

storage

writing

speed.

Storage

operation

uses

a

variable

Persistence

mode

and

a

Save

mode.

The

variable

Persistence

mode

electrically

controls

the

retention

of

the

CRT.

The

Save

mode

provides

langer

retention

of

the

stored

display,

and

a

lockout

function

to

prevent

accidental

erasure

of

the

stored

display.

7613/R7613

PRELIMINARY

INFORMATION

ee

ee

Safety

Information

This

instrument

has

been

designed

and

tested

according

to

International

Electrotechnical

Commission

(IEC)

Pub-

lication

348

‘Safety

Requirements

for

Electronic

Meas-

uring

Apparatus’,

and

has

been

supplied

in

safe

condition.

This

instruction

manual

contains

some

informative

and

warning

texts

which

the

user

must

follow

to

ensure

safe

operation

and

to

retain

this

instrument

in

safe

condition.

lim

ba

This

instrument

meets

the

requirements

of

Safety

Class

|

apparatus.

AC

Power

Sources.

This

instrument

is

intended

to

be

operated

from

a

single-phase

earth-referenced

power

source

having

one

current-carrying

conductor

(the

Neutral

Con-

ductor)

near

earth

potential.

Operation

from

power

sources

where

both

current-carrying

conductors

are

live

with

respect

to

earth

(such

as

phase-

to-phase

on

a

three-wire

system)

is

not

recommended,

since

only

the

Line

Con-

ductor

has

over-current

(fuse)

protection

within

the

instru-

ment.

AC

Power

Cord,

This

instrument

has

a

three-wire

power

cord

with

a

three-terminal

polarized

plug

for

connection

to

@

power

source

and

safety-earth.

The

safety-earth

ter-

minal

of

the

plug

is

directly

connected

to

the

instrument

frame.

For

electric-shock

protection,

insert

this

plug

only

in

a

mating

outlet

with

a

safety-earth

contact

or

otherwise

connect

the

frame

to

a

safety-earth

system.

The

color-

coding

of

the

cord

conductors

is

in

accordance

with

recognized

standards.

Power

Cord

Conductor

Identification

Section

1-7613/R7613

Operators

OPERATING

INSTRUCTIONS

pins

which

represent

the

desired

regulating

range.

Select

a

range

which

is

centered

about

the

average

line

voltage

to

which

the

instrument

is

to

be

connected

(see

Table

1-1).

TABLE

1-1

Regulating

Range

and

Fuse

Data

Pins

Regulating

Range

Selected

110-volts

nominal

220-volts

nominal

LOW

90

to

110

volts

180

to

220

volts

MED

99

to

121

volts

198

to

242

volts

Ht

108

to

132

volts

218

to

262

volts

Line

Fuse

3.1

A

slow-blow

1.6

A

slow-blow

Conductor

Color

Alternate

Color

Ungrounded

(Line}

Brown

Black

Grounded

(Neutral)

Blue

White

Green-Yellow

Grounding

(Earthing)

Green-Yellow

The

7613

can

be

operated

from

either

a

110-volt

or

a

220-volt

nominal

line-voltage

source.

In

addition,

three

operating

ranges

can

be

selected

within

each

nominal

line

voltage

source.

The

voltage-selector

jumper

on

the

Rectifier

board

(see

Fig.

1-1)

allows

selection

of

the

operating

voltage.

To

convert

the

instrument

from

one

regulating

range

to

another,

first

disconnect

the

instrument

from

the

Oo

power

source.

Then,

slide

out

the

power

unit

as

described

in

the

Maintenance

section

of

the

Service

manual.

Remove

the

voltage-selector

jumper

and

re-install

it

on

the

set

of

woe

lm

REV.

D,

AUG.

1977

To

convert

from

110-volts

to

220-volts

nominal

line

voltage,

or

vice

versa,

remove

the

voltage-selector

jumper

and

replace

it

with

the

spare

jumper

(stored

on

pins

adjacent

to

voltage

selector

area).

The

jumpers

are

color-coded

to

indicate

the

nominal

voltage

for

which

they

are

intended;

brown

for

110-volt

nominal

operation

and

red

for

220-volt

nominal

operation.

Change

the

line

fuse

to

provide

protection

for

the

selected

nominal

line

voltage.

Use

the

fuse

located

in

the

ALT

FUSE

holder

on

the

Rectifier

board

(see

Fig.

1-1)

or

see

Table

1-1

for

value.

Also,

change

the

line-cord

plug

to

match

the

power-source

receptacle

or

use

a

suitable

adapter.

Operating

Temperature

The

7613

can

be

operated

where

the

ambient

air

temperature

is

between

O°C

and

+50°C.

This

instrument

can

be

stored

in

ambient

temperatures

between

—55°C

and

+75°C.

After

storage

at

temperatures

beyond

the

operating

limits,

allow

the

chassis

temperature

to

come

within

the

operating

limits

before

power

is

applied.

shes

Line

fuse

+15

V

Fuse

ALT

fuse

Spare

jumper

Fig.

1-1.

Location

of

Voltage-selector

jumper,

spare

jumper,

and

230

V

fuse

in

power-unit

(shown

removed).

1-1

Operating

Instructions—7613/R7613

Operators

The

7613

is

cooled

by

air

drawn

through

the

instrument.

Components

which

require

the

most

cooling

are

mounted

externally

on

a

heat

radiator

at

the

rear.

Adequate

clearance

must

be

provided

on

all

sides

to

allow

heat

to be

dissipated

from

the

instrument.

Do

not

block

or

restrict

the

air

flow

through

the

holes

in

the

cabinet

or

the

heat

radiator

on

the

rear.

Maintain

the

clearance

provided

by

the

feet

on

the

bottom

and

allow

about

two

inches

clearance

on

the

top,

sides,

and

rear

(more

if

possible).

The

R7613

is

cooled

by

air

drawn

in

through

the

air

filter

on

the

rear

panel

and

blown

out

through

the

holes

on

the

right

side.

Adequate

clearance

must

be

provided

at

these

locations.

Allow

at

least

one

and

one-half

inches

clearance

behind

the

air

filter

and

at

least

one

inch

on

the

right

side.

A

thermal

cutout

in

this

instrument

provides

thermal

protection

and

interrupts

the

power

to

the

instrument

if

the

internal

temperature

exceeds

a

safe

operating

level.

Power

is

automatically

restored

when

the

temperature

returns

to

a

safe

level.

Operation

in

confined

areas

or

in

close

proximity

to

heat-producing

instruments

may

cause

the

thermal

cutout

to

open

more

frequently.

Operating

Position

A

bail-type

stand

is

mounted

on

the

bottom

of

this

instrument.

This

stand

permits

the

7613

to

be

tilted

up

about

10°

for

more

convenient

viewing.

Rackmounting

Instructions

and

dimensional

drawings

for

rackmounting

the

R7613

are

located

in

Section

3

of

the

Operators

manual.

DISPLAY

DEFINITIONS

General

The

following

definitions

describe

the

types

of

displays

which

can

be

obtained

with

a

7613

Oscilloscope

system

with

real-time

amplifiers,

time-base

units,

or

combinations

of

these.

Use

of

special

purpose

plug-in

units

may

result

in

different

types

of

displays,

which

are

defined

in

the

instruction

manuals

for

these

special

units.

The

following

terminology

will

be

used

throughout

this

manual.

Alternate

Mode

A

time-sharing

method

of

displaying

two

or

more

signals

with

a

single

cathode-ray

tube

beam.

Channel

switching

is

sequential

and

occurs

at

the

end

of

each

sweep.

1-2

Chopped

Mode

A

time-sharing

method

of

displaying

two

or

more

signals

with

a

single

cathode-ray

tube

beam.

Channel

switching

is

sequential

and

occurs

at

a

rate

determined

by

an

internal

clock

generator

(chopping

rate).

Stored

Displays

A

display

that

is

retained

by

the

target

surface

(phosphor

particles).

Variable-persistence

A

system

where

the

retention

of

the

storage

CRT

can

be

changed

electronically.

NOTE

See

Simplified

Operating

Instructions

in

this

section

|

for

set-up

information

to

obtain

each

of

the

following

displays.

Single

Trace

A

display

of

a

single

plot

produced

by

one

vertical

signal

and

one

sweep.

Dual

Trace

A

display

of

two

plots

produced

by

two

vertical

signals

and

one

sweep.

Delayed

Sweep

—

Single

Trace

|

A

display

of

a

single

plot

produced

by

one

vertical

signal

and

a

delayed

sweep.

Two

sweeps

are

used

to

produce

this

display;

the

sweeps

are

operating

with

a

delaying/delayed

relationship

where

one

sweep

(identified

as

the

delaying

sweep)

delays

the

start

of

the

second

sweep

(identified

as

the

delayed

sweep).

Delayed

Sweep

—

Dual

Trace

A

display

of

two

plots

produced

by

combining

two

vertical signals

and

a

delayed

sweep.

Two

sweeps

are

used

to

produce

this

display;

the

sweeps

are

operating

with

a

delaying/delayed

relationship.

Each

vertical

signal

is

displayed

against

the

delayed

sweep.

X-Y

A

plot

of

two

variables,

neither

of

which

ceorseanen

time.

X

refers

to

the

horizontal

axis

and

Y

refers

to

the

vertical

axis.

PLUG-IN

UNITS

6

General

The

7613

is

designed

to

accept

up

to

three

TEKTRONIX

7-series

plug-in

units.

This

plug-in

feature

allows

a

variety

of

display

combinations

and

also

allows

selection

of

bandwidth,

sensitivity,

display

mode,

etc.

to

meet

the

measurement

requirements.

In

addition,

it

allows

the

oscilloscope

system

to

be

expanded

to

meet

future

measurement

requirements.

The

overall

capabilities

of

the

resultant

system

are

in

large

part

determined

by

the

characteristics

of

the

plug-in

selected.

For

‘“omplete

information

on

plug-ins

available

for

use

with

this

instrument,

see

the

current

Tektronix,

Inc.,

catalog.

Plug-In

Installation

To

install

a

plug-in

unit

into

one

of

the

plug-in

compartments,

align

the

slots

in

the

top

and

bottom

of

the

plug-in

with

the

associated

guide

rails

in

the

plug-in

compartment.

Push

the

plug-in

unit

firmly

into

the

plug-in

compartment

until

it

locks

into

place.

To

remove

a

plug-in,

pull

the

release

latch

on

the

plug-in

unit

to

disengage

it

and

pull

the

unit

out

of

the

plug-in

compartment.

Plug-in

units

can

be

removed

or

installed

without

turning

off

the

instrument

power.

It

is

not

necessary

that

all

of

the

plug-in

compartments

be

filled

to

operate

the

instrument;

the

only

plug-in

units

needed

are

those

required

for

the

measurement

to

be

made.

At

environmental

extremes,

excess

radiation

may

be

radi-

ated

into

or

out

of

this

instrument

through

the

open

plug-in

compartments.

To

reduce

such

interference,

or

to

meet

EMI

specifications

for

Option

3

modified

instruments,

blank

plug-in

panels

are

available

from

Tektronix,

Inc.,

to

cover

the

unused

compartment;

order

TEKTRONIX

Part

No.

016-0155-00.

When

the

7613

is

calibrated

in

accordance

with

the

calibration

procedure

given

in

the

Service

manual,

the

vertical

and

horizontal

gain

are

standardized.

This

allows

calibrated

plug-in

units

to

be

changed

from

one

plug-in

compartment

to

another

without

recalibration.

However,

the

basic

calibration

of

the

individual

plug-in

units

should

be

checked

when

they

are

installed

in

this

system

to

verify

their

measurement

accuracy.

See

the

operating

instructions

section

of

the

plug-in

unit

instruction

manual

for

verification

procedure.

Special

purpose

plug-in

units

may

have

specific

restrictions

regarding

the

plug-in

compartments

in

which

they

can

be

installed.

This

information

will

be

given

in

the

instruction

manual

for

these

plug-in

units.

NOTE

Later

production

of

rackmount

oscilloscopes

are

pro-

vided

with

support

posts

between

the

individual

plug-

6

in

compartments.

A

post

or

posts

must

be

removed

if

a

multi-width

plug-in

is

to

be

installed.

To

remove

a

REV.

C,

OCT.

1974

Operating

Instructions—7613/R7613

Operators

post,

unfasten

the

screws

that

secure

it

at

the

top

and

bottom

of

the

plug-in

housing.

CONTROLS

AND

CONNECTORS

The

major

controls

for

operation

of

the

7613

are

located

on

the

front panel

of

the

instrument.

Figs.

1-2

and

1-3

provide

a

brief

description

of

each

control

and

connector.

More

detailed

operating

information

is

given

under

General

Operating

Information.

OPERATING

CHECKOUT

General

The

following

Operating

Checkout

provides

a

means

of

verifying

instrument

operation

and

basic

calibration

without

removing

the

covers

or

making

internal

adjustments.

Since

it

demonstrates

the

use

of

all

controls

and

connectors,

it

can

also

be

used

to

provide

basic

training

on

the

operation

of

this

instrument.

If

re-calibration

of

the

7613

appears

to

be

necessary,

see

the

Calibration

procedure

in

Section

5

of

the

Service

manual.

If

re-calibration

of

a

plug-in

unit

is

indicated,

see

the

Instruction

manual

for

the

appropriate

plug-in

unit.

Set-Up

Information

1.

Set

the

front-panel

controls

as

follows:

INTENSITY

Counterclockwise

FOCUS

Midrange

GRATICULE

ILLUM

As

desired

VERT

MODE

LEFT

TRIG

SOURCE

VERT

MODE

POWER

ON

NON-STORE

Pushed

In

STORE

Out

SAVE

Out

STORED

INTENSITY

PERSISTENCE

SAVE

TIME

Counterclockwise

Counterclockwise

Clockwise

2.

Connect

the

7613

to

a

power

source

which

meets

the

voltage

and

frequency

requirements

of

this

instrument.

The

applied

voltage

should

be

near

the

center

of

the

voltage

range

marked

on

the

rear

panel

(see

Operating

Voltage

in

this

section

for

information

on

converting

this

instrument

from

one

operating

voltage

to

another).

3.

Install

TEKTRONIX

7A-series

amplifier

units

into

both

the

left

and

right

vertical

plug-in

compartments.

Install

a

7B-series

time-base

unit

into

the

horizontal

compartment.

4.

Press

the

POWER

switch

to

turn

the

instrument

on.

Allow

several

minutes

warmup

before

proceeding.

1-3

.

CALIBRATOR

—Calibrator

Operating

Instructions—7613/R7613

Operators

FUNCTIONS

OF

CONTROLS

AND

CONNECTORS

a

INTENSITY—Controls

brightness

of

the

display.

Control

is

inoperative

when

horizontal

compartment

is

vacant.

READOUT~—Turns

on

the

readout

display

and

controls

the

readout

intensity.

.

FOCUS—Provides

adjustment

for

optimum

display

definition.

.

GRATICULE

ILLUM-—Controls

graticule

iltumination.

.

BEAM

FINDER—When

pressed,

the

dis-

play

is

limited

within

the

graticule

area.

.

TRIG

SOURCE

-Selects

source

of

internal

trigger

signal

for

the

time

base

plug-in

in

the

horizontal

compartment.

LEFT:

The

trigger

signal

is

obtained

from

the

plug-in

unit

in

the

left

vertical

compartment

only.

VERT

MODE:

Trigger

signal

automatically

follows

the

vertical

display

except

in

CHOP

and

ADD;

then

the

trigger

signal

is

the

algebraic

sum

of

the

signals

from

the

left

and

right

vertical

compartments.

RIGHT:

The

trigger

signal

is

obtained

from

the

plug-in

unit

in

the

right

vertical

compartment

only.

.

POWER-—Switch

controls

the

power

to

the

instrument.

Light

indicates

that

the

power

switch

is

on

and

that

the

instrument

is

connected

to

a

line

voltage source.

output

pin

jacks

(4V,

0.4V,

40

mV,

and

ground).

Positive-going

pulse

or

DC

voltage

selected

by

changing

internal

jumper.

.

VERT

MODE

—Selects

vertical

mode

of

operation.

LEFT:

Signals

from

plug-in

unit

in

left

vertical

compartment

are

displayed.

ALT:

Signals

from

both

plug-in

units

in

both

the

left

and

right

vertical

compartments

are

displayed

(dual

trace).

Display

switches

between

vertical

plug-in

units

after

each

sweep.

ADD:

Signals

from

plug-in

units

in

both

the

left

and

right

(i)

iy

(ae

Fig. 1-2.

Front-panel

controls

and

connectors.

10.

11.

12.

13.

14,

15.

16.

17.

co)

15}

vertical

compartments

are

algebraically

added

and

the

sum

is

displayed

on

the

CRT.

CHOP:

Signals

from

plug-in

units

in

both

the

left

and

right

vertical

compartments

are

displayed

(dual

trace).

The

display

is

switched

between

vertical

plug-in

units

at

approximately

a

one

megahertz

rate.

RIGHT:

Signals

from

plug-in

unit

in

right

vertical

compart-

ment

is

displayed.

NON-STORE-Selects

non-store

operation.

STORE-Selects

storage

operation.

PERSISTENCE—Controls

the

retention

of

the

stored

display.

SAVE

—Prevents

accidental

erasure,

and

additional

storage

of

information.

SAVE

TIME—Used

with

the

SAVE

mode

for

extending

retention.

When

in

the

MAX

detent

there

is

no

visible

stored

display

in

all

storage

modes.

STORED

INTENSITY-—Select

writing

speed

and

view

time

combination

controls

(brightness

of

stored

display).

Camera

Power

(Not

Labeled)—Three-pin

connector

on

CRT

bezel

provides

power

output

(+15

V).

Receives

remote

single

sweep

reset

signal

from

compatible

camera

systems,

and

a

ground

pin

connection.

ERASE—Erases

stored

display.

REV.

FEB

1974

Operating

Instructions—7613/R7613

Operators

f

(

a

a

Ve

«

1.

FUSE

—Line

voltage

fuse.

2.

REMOTE

ERASE

IN

—Provides

external

connection

for

remote

erase,

3.

EXT

S S

RESET

IN—Remote

single

sweep

reset.

py

.

EXT

Z

AXIS

IN—Input

for

intensity

modulation

of

the

CRT

display.

5.

VERT

SIG

OUT

—Vertical

signal

selected

by

TRIG

SOURCE

switch

(LEFT,

RIGHT,

ALT

and

ADD).

6.

+GATE

OUT-—Gate

signal

selected

by

gate

selector

switch

(Main,

Auxiliary,

and

Delay).

7.

+SAWTOOTH

OUT-—Positive-going

sawtooth

from

time-base

unit.

——————

OO

Owe

weer

cee

were

ee

—

eS

=

=

ee

rc

ow

—

—e

—_—

Se

—

“sa

—

Se

—

=

a

=

Oe

oO

SS

—

Oe

eZ

oe

;

e==

SE

SSS

FL

priaereh

baste:

tb

pean

Se

en

——

a

=—=—s

——

oleate

al

al

el

ol

ee

ee

ee

ee

———

1365-02

Fig.

1-3.

Rear-panel

controls

and

connectors.

Operating

Instructions—7613/R7613

Operators

5.

Set

both

vertical

units

for

a

deflection

factor

of

two

volts/division

and

center

the

vertical

position

controls.

Set

both

vertical

units

for

AC

input

coupling.

6.

Set

the

time-base

unit

for

a

sweep

rate

of

one

millisecond/division

in

the

auto,

internal

trigger

made.

7.

Advance

the

INTENSITY

control

until

the

trace

is

at

the

desired

viewing

level

(near

midrange).

Advance

the

READOUT

until

the

readout

display

is

at

the

desired

viewing

level.

8.

Connect

the

4

V

calibrator

pin-jack

to

the

input

of

the

left

vertical

unit

with

a

BNC

to

pin-jack

cable

(supplied

accessory).

Display

Focus

9.

Adjust

the

FOCUS

adjustment

for

a

sharp,

well-defined

display

over

the

entire

trace

length.

If

a

properly

focused

display

cannot

be

obtained

with

the

FOCUS

adjustment,

the

internal

Astigmatism

adjustment

must

be

reset;

see

the

Calibration

section

of

the

Service

manual.

Trace

Alignment

10.

Disconnect

the

input

signal

and

position

the

trace

with

the

left

vertical

unit

position

control

so

it

coincides

with

the

center

horizontal

line

of

the

graticule.

If

the

trace

is

not

parallel

to

the

center

horizontal

line

of

the

graticule,

see

Trace

Rotation

adjustment

procedure

in

Calibration

section.

Graticule

Illumination

11.

Rotate

the

GRATICULE

ILLUM

control

through-

out

its

range

and

notice

that

the

illumination

of

the

graticule

lines

increases

as

the

control

is

turned

clockwise

(most

obvious

with

tinted

filter

installed).

Set

the

control

so

the

graticule

lines

are

illuminated

as

desired.

Vertical

Deflection

System

12.

Connect

the

4V

calibrator

signal

to

the

input

connector

of

the

left

vertical unit

with

the

BNC

to

pin-jack

cable.

Set

both

vertical

units

for

a

deflection

factor

of

one

volt/division.

The

display

amplitude

should

be

four

divisions.

Note

the

exact

display

amplitude

for

step

15.

13.

Notice

that

the

position

control

of

only

the

left

vertical unit

has

an

effect

on

the

position

of

the

display.

Position

the

display

to

the

upper

half

of

the

graticule.

1-6

14.

Press

the

RIGHT

button

of

the

VERT

MODE

switch.

Remove

the

calibrator

signal

from

the

left

vertical

and

connect

it

to

the

right

vertical.

The

display

amplitude

should

be

four

divisions

within

0.12

division.

Note

the

exact

display

amplitude

for

the

next

step.

15.

A

correct

display

in

both

steps

12

and

14

indicates

that

the

7613

Vertical

Deftectian

System

and

the

vertical

plug-in

units

are

calibrated.

If

the

displays

noted

previously

are

both

outside

the

given

tolerance

in

the

same

direction

(i.e.,

high

or

low),

the

Vertical

Gain

or

4

Volts

calibrator

adjustment

probably

needs

re-adjustment.

Otherwise,

check

the

calibration

of

the

vertical

plug-in

units.

16.

Notice

that

the

position

control

of

only

the

right

vertical

unit

has

an

effect

on

the

position

of

the

display.

Position

the

display

to

the

lower

half

of

the

graticule.

Set

both

vertical units

for

a

deflection

factor

of

two

volts/division.

Connect

the

calibrator

signal

to

both

vertical

units

by

using

a

dual

input

coupler.

17.

Press

the

ALT

button

of

the

VERT

MODE

switch.

Notice

that

two

traces

are

displayed

on

the

CRT.

The

top

trace

is

produced

by

the

left

vertical

unit

and

the

bottom

trace

is

produced

by

the

right

vertical

unit.

Set

the

sweep

rate

to

50

milliseconds/division.

Notice

that

the

display

alternates

between

the

left

and

right

vertical

units

after

each

sweep.

Turn

the

sweep

rate

switch

throughout

its

range.

Notice

that

the

display

alternates

between

vertical

units

at

all

sweep

rates.

18.

Press

the

CHOP

button

of

the

VERT

MODE

switch.

Turn

the

sweep

rate

throughout

its

range.

Notice

that

a

dual-trace

display

is

presented

at

all

sweep

rates,

but

unlike

ALT

both

vertical

units

are

displayed

on

each

sweep

in

a

time-sharing

manner.

Return

the

sweep

rate

to

0.5

millisecond

/division.

19.

Press

the

ADD

button

of

the

VERT

MODE

switch.

The

display

should

be

the

algebraic

sum

of

both

signals.

Notice

that

the

position

control

of

either

vertical

unit

moves

the

display.

Return

the

VERT

MODE

switch

to

LEFT.

Triggering

20.

Center

the

display

on

the

CRT

with

the

left

vertical

unit

position

control.

Disconnect

the

input

signal

from

the

right

vertical

unit

input

connector.

Sequentially

press

all

of

the

VERT

MODE

switch

buttons.

Notice

that

a

stable

display

is

obtained

in

all

positions

of

the

VERT

MODE

switch

(straight

line

in

RIGHT

position}.