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INSTRUCTION

MANUAL

Serial

Number

___________

TYPE

556

OSCILLOSCOPE

Tektronix,

Inc.

S.W.

Millikan

Way

•

P.

O.

Box

500

•

Beaverton,

Oregon

97005

•

P one

644-0161

•

Cables:

Tektronix

070-0757-00

1167

or

service.

Specifications

and

price

c ange

privi

leges

reserved.

Copyrig t

©

1966,

new

material

1967

by

Tektronix,

Inc.,

Beaverton,

Oregon.

Printed

in

t e

United

States

of

America.

All

rig ts

reserved.

Contents

of

t is

pub



lication

may

not

be

reproduced

in

any

form

wit out

permission

of

t e

copyrig t

owner.

Type

556

WARRANTY

All

Tektronix

instruments

are

warranted

against

defective

materials

and

workman



s ip

for

one

year.

Tektronix

transformers,

manufactured

in

our

own

plant,

are

war



ranted

for

t e

life

of

t e

instrument.

Any

questions

wit

respect

to

t e

war



ranty

mentioned

above

s ould

be

taken

up

wit

your

Tektronix

Field

Engineer.

Tektronix

repair

and

replacement-part

service

is

geared

directly

to

t e

field,

t erefore

all

requests

for

repairs

and

re



placement

parts

s ould

be

directed

to

t e

Tektronix

Field

Office

or

representative

in

your

area.

T is

procedure

will

assure

you

t e

fastest

possible

service.

Please

include

t e

instrument

Type

and

Serial

or

Model

Number

wit

all

requests

for

parts

CONTENTS

C aracteristics

Operating

Instructions

Circuit

Description

Maintenance

Performance

C eck

Calibration

Abbreviations

and

Symbols

Parts

Ordering

Information

Electrical

Parts

List

Mec anical

Parts

List

Information

Mec anical

Parts

List

Diagrams

Mec anical

Parts

List

Illustrations

Accessories

Abbreviations

and

symbols

used

in

t is

manual

are

based

on

or

taken

directly

from

IEEE

Stand



ard

260

"Standard

Symbols

for

Units",

MIL-STD-

1

2B

and

ot er

standards

of

t e

electronics

indus



try.

C ange

information,

if

any,

is

located

at

t e

rear

of

t is

manual.

Type

556

Section

1

Section

2

Section

3

Section

4

Section

5

Section

6

Section

7

Section

8

Section

9

Sorial

number

2000

and

up.

Serial

number

999

and

below.

Fig.

- .

Type

556

Oscilloscopes.

Type

556

Type

556

SECTION

1

CHARACTERISTICS

C ange

information,

if

any,

affecting

t is

section

is

found

at

t e

rear

of

t e

manual.

Introduction

T e

Type

556

Oscilloscope

—

is

a

versatile

dual-beam

labor



atory

type

instrument

providing

accurate

voltage

and

time

measurements

in

t e

DC

to

50

MHz

frequency

range.

Two

complete

orizontal

and

vertical

deflection

systems

permit

completely

indepentent

operation

of

t e

two

beams.

T e

Upper

Beam

can

display

t e

signal

from

eit er

t e

left

or

rig t

vertical

plug-in

unit

and

may

be

controlled

by

eit er

t e

A

or

B

time

base

or

an

external

signal.

T e

Lower

Beam

displays

t e

signal

from

t e

rig t

plug-in

and

t e

sweep

is

controlled

by

t e

B

time

base

or

an

external

signal.

T e

left

and

rig t

plug-in

compartments

accept

all

letter

series

and

1

-series

plug-ins.

Special

circuits

wit in

t e

oscilloscope

provide

selection

of

an

accurate,

continuously-variable

delay

w en

using

t e

B

sweep.

T e

B

sweep

may

be

delayed

by

t e

A

sweep

from

0.1

µs

to

50

s

(calibrated)

after

application

of

a

trigger

pulse.

T is

feature

permits

t e

delayed

B

sweep

to

expand

a

selected

portion

of

t e

undelayed

A

sweep,

t ereby

pro



viding

precise

time

measurements

and

detailed

observation

of

t e

signal.

Bot

t e

delayed

and

undelayed

sweeps

can

be

presented

simultaneously

on

t e

oscilloscope

screen.

T e

Upper

Beam

trace

as

an

intensified

zone

indicating

t e

por



tion

of

t e

signal

being

displayed

by

t e

B

sweep

and

Lower

Beam.

T e

instrument

is

designed

to

operate

over

an

ambient

temperature

range

of

0°

C

to

+50°

C.

Performance

speci



fications

t at

are

given

in

t e

center

column

apply

over

t is

temperature

range

after

a

warmup

time

of

20

minutes.

Sup



plemental

information

describing

a

c aracteristic

or

a

feature

is

also

included

in

t is

portion

of

t e

manual.

VERTICAL

AMPLIFIERS

C aracteristics

Performance

Specification

Supplemental

Information

Frequency

Response

DC

to

>50

MHz

at

3

dB

down

wit

a

1

-series

plug-in

unit

aving

a

risetime

of

3.12

ns

or

less.

Risetime

<6.25

ns.

Indicated

risetime

of

6.93

ns

wit

a

Test

Load

Plug-In

Unit

(Tektronix

Part

No.

067-0521-00)

aving

a

risetime

of

3

ns.

Transient

Response

on

Screen

<2.25%

peak

overs oot,

rounding,

ringing

or

tilt.

Applies

to

all

t ree

vertical

modes

wit

Test

Load

Plug-In

Units.

Gain

C ange

wit

Line

Voltage

C ange

<1%

from

147

VAC

peak

to

178

VAC

peak.

Trace

Drift

wit

Line

Voltage

C ange

±2

mm

from

147

VAC

peak

to

178

VAC

peak.

A

&

B

SWEEP

GENERATORS

Calibration

Accuracy

5

s/cm

to

0.1

µs/cm

±3%

of

displayed

time

between

two

points

displayed

wit in

t e

middle

8

cm.

X10

Magnified

Display

±5%

of

displayed

time

between

any

two

points

>1

cm

apart

displayed

wit in

t e

middle

8

cm.

Calibrated

from

4

cm

to

70

cm

from

sweep

start.

Extends

fastest

sweep

rate

to

10

ns/cm.

Variable

Time/Cm

Range

>2.5:1.

Extends

slowest

sweep

to

approximately

12.5

s/cm.

Sweep

Lengt

10.5

cm

±0.5

cm

At

1

ms/cm.

VARIABLE

TIME

DELAY

Delay

Time

Accuracy

5

s/cm

to

1

µs/cm

±1%

of

indicated

delay

time

±2%

of

A

TIME/CM

setting

+

fixed

delay

of

<150

ns

in

system.

1%

of

A

TIME/CM

setting

corresponds

to

1

minor

division

on

t e

DELAY-TIME

MULTIPLIER

dial.

0.5

µs/cm

to

0.1

µs/cm

±1

%

of

indicated

delay

time

±5%

of

A

TIME/CM

setting

+

fixed

delay

of

<150

ns

in

system.

For

additional

information

refer

to

Fig.

2-10

in

t e

Operation

Instructions.

-

Characteristics

—

Type

556

C aracteristics

Performance

Specification

Supplemental

Information

Incremental

Delay

Time

Accuracy

5

s/cm

to

1

µs/cm

±1%

of

indicated

incremental

delay

time

±4%

of

A

TIME/CM

setting.

Incremental

Delay

Time

is

t e

difference

between

two

delay

time

readings.

0.5/is/cm

to

0.1

µs/cm

±1%

of

indicated

incremental

delay

time

±7

%

of

A

TIME/CM

setting.

For

additional

information

refer

to

Page

2-24

in

t e

Operating

Instructions.

S ort

Term

Jitter

<1

part

in

20,000

of

t e

available

delay

time.

EXTERNAL

HORIZONTAL

AMPLIFIERS

Ext.

Horizontal

Deflection

Factor

<0.1

V/cm

wit

DISPLAY

MAG

in

X10

posi



tion.

Transient

Response

±3%

peak

overs oot,

rounding,

ringing

or

tilt.

Variable

Range

>10:1

Frequency

Response

DC

to

>400

kHz

at

3

dB

down.

VARIABLE

control

set

fully

cw.

Maximum

Input

Voltage

50

V

combined

DC

-|-

peak

AC.

Wit

DISPLAY

MAG

in

X10

position.

Input

C

Approximately

65

pF.

A

&

B

TRIGGERING

FEATURES

C aracteristic

Feature

Source

Internal

Normal

(from

left

or

rig t

trigger

pick-off

circuit

wit in

t e

vertical

amplifier),

Internal

Plug-In

(from

one

of

t e

c annels

in

t e

left

or

rig t

Type

1A1

or

1A2

Plug-In

Unit),

Line

and

External.

Coupling

Capacitive

(AC),

low-frequency

reject

(AC

LF

REJ),

ig -frequency

reject

(AC

HF

REJ)

or

direct

(DC).

Slope

Triggering

on

positive-or-negative-going

portion

of

triggering

signal.

Mode:

Auto

Stability

Free

runs

sweep

in

absence

of

a

triggering

signal;

instrument

can

be

triggered

on

signals

>30

Hz.

Triggered

Triggered

at

an

adjustable

level.

Jitter

<2

ns.

LEVEL

Control

Range:

Normal

>

±2V.

X10

Increase

>

±20

V.

External

Trigger

Input:

R

&

C

Approximately

1

mego m

paralleled

by

approximately

35

pF.

Volts

50

V

maximum

(DC

plus

peak

AC).

A

&

B

TRIGGERING

SENSITIVITY

INT

PLUG

IN

C aracteristics

t at

apply

for

t e

EXT

trigger

input

also

apply

to

t e

Int

Plug-In

interconnection

(pin

5

of

plug-in

connectors

JI

1

and

JI

2).

Trigger

Coupling/Source

To

10

MHz

To

50

MHz

AC:

INT

NORM

<

2

mm

display

amplitude

above

60

Hz.

<

1

cm

display

amplitude.

EXT

<

0.2

V

above

60

Hz.

<

0.4

V.

AC

LF

REJ:

INT

NORM

>

3

cm

display

amplitude

at

30

Hz.

<

2

mm

display

amplitude

above

2.5

kHz.

<

1

cm

display

amplitude.

EXT

>

3

V

at

30

Hz.

<

0.2

V

above

2.5

kHz.

<

0.4

V.

AC

HF

REJ:

INT

NORM

<2

mm

display

amplitude

from

60

Hz

to

60

kHz,

>1

cm

at

6

MHz.

EXT

<0.2

V

from

60

Hz

to

60

kHz,

>

1

V

at

6

MHz.

DC

INT

NORM

<

3.5

mm

display

amplitude.

<

2

cm

display

amplitude.

EXT

<

0.2

V.

<

0.4

V.

1-2

Characteristics

—

Type

556

AMPLITUDE

CALIBRATOR

C aracteristic

Performance

Specification

Supplemental

Information

Voltage

Accuracy

±2%.

5

mA

Current

Loop

Accuracy

±2%.

Repetition

Rate

1

kHz

±25%

Duty

Cycle

45%

to

55%.

Risetime

<

1.5

µS.

70

pF

load.

Terminated

Voltage

Accuracy

One- alf

indicated

voltage

±2%

w en

termi



nated

into

50

o ms

±0.1%.

Applies

to

AMPLITUDE

CALIBRATOR

switc

positions

from

0.2

mV

to

0.2

V

only.

Z

AXIS

INPUTS

Sensitivity

I

10

V

P

to

P

causes

noticeable

modula



tion

intensity.

Input

R

at

DC

1

1

mego m

±10%.

FRONT-PANEL

OUTPUT

SIGNALS

A

GATE

>

8

V

positive-going

pulse.

Wit

baseline

at

zero

volts.

Time

coin



cident

wit

t e

A

sweep.

Maximum

current

is

10

mA.

Recommended

load

resistance

>1

k.

B

GATE

>

8

V

positive-going

pulse.

Wit

baseline

at

zero

volts.

Time

coin



cident

wit

t e

B

sweep.

Maximum

current

is

10

mA.

Recommended

load

resistance

>1

k.

DLY'D

TRIG

>

7

V

positive-going

pulse

into

a

>1

k

load.

Pulse

occurs

at

t e

end

of

t e

A

sweep

delay

period.

A

SAWTOOTH

>

9V/cm.

Has

t e

same

time

duration

as

t e

A

sweep.

Recommended

load

resistance

>30

k.

B

SAWTOOTH

>

9V/cm.

Has

t e

same

time

duration

as

t e

B

sweep.

Recommended

load

resistance

>30

k.

Line

Frequency

50

Hz

to

60

Hz

400

Hz

wit

special

fan

modification.

Power

Consumption

±840

W

maximum.

±1

kVA

maximum.

T ermal

Protection

An

automatic

resetting

t ermal

cutout

interrupts

instrument

power

if

internal

temperature

exceeds

safe

operating

level.

POWER

SOURCE

REQUIREMENTS

For

serial

numbers

2000

and

up

Regulating

Range

Selection:

AC

RMS

Operating

Range

(<2%

armon



ic

distortion

of

t e

in-

AC

Peak

Operating

Range

(>2%

armon-

is

distortion

1

)

put

power

waveform)

115

Volts

LO

90

to

110

V

127

to

156

V

A

Line

Voltage

Selector

assembly

facilit-

M

104

to

126

V

147

to

178

V

ies

selection

of

a

regulating

range

com-

patible

wit

t e

actual

line

voltage.

HI

112

to

136

V

158

to

192

V

230

Volts

LO

180

to

220

V

254

to

311

V

M

208

to

252

V

294

to

356

V

HI

224

to

272

V

316

to

384

V

_

Peak

V

Crest

Factor

~

—

between

.30

and

.4 4.

-3

Characteristics

—

Type

556

C aracteristic

Performance

Specification

Supplemental

Infromation

For

serial

numbers

100-1999

Normal

Line:

AC

RMS

Operating

Range

(<2%

armon



ic

distortion

of

t e

in



put

power

waveform)

AC

Peak

Operating

Range

(>2%

armon



ic

distortion

1

)

115

VAC

Nominal

100

to

130

V

142

to

183

V

Normally

wired

at

t e

factory

for

t is

voltage

unless

directed

ot erwise.

230

VAC

Nominal

200

to

260

V

284

to

366

V

Low

Line:

104

VAC

Nominal

90

to

117

V

127

to

165

V

208

VAC

Nominal

180

to

234

V

254

to

330

V

CRT

AND

DISPLAY

2

Crest

Factor

=

-------------

—

between

.30

and

.4 4.

C aracteristic

Information

Tube

Type

T5560-31-1.

Dual-Beam,

round,

glass

envelope.

Tektronix

Part

No.

154-0500-00.

P osp or

P31

standard.

Ot ers

available

on

special

order.

Accelerating

Potential

Approximately

lOkV;

gun

potential

is

2

kV.

Scan

Area

>6

cm

vertical

by

10

cm

orizontal

per

beam.

Beams

can

be

overlapped

in

a

4

cm

area.

Graticule

Type

Internal.

8

cm

vertical

by

10

cm

orizontal.

Eac

major

division

is

1

cm;

four

corners

are

omitted.

Graticule

Illumination

Variable

edge

lig ting.

Internal

Unblanking

DC-coupled

to

CRT

control

grids

from

t e

Sweep

Generators.

Ort ogonality

Wit in

±1%.

Trace

Rotation

Range

Sufficient

to

align

traces

wit

t eir

respective

graticule

lines.

Beam

Finder

Limits

traces

wit in

graticule

area.

ELECTROMAGNETIC

INTERFERENCE

Electromagnetic

Interference

Meets

interference

specifications

of

MIL-I-6181D

over

t e

following

frequency

ranges:

Radiated

(wit

CRT

mes

filter,

cabinet

covers

and

BNC

connector

covers

installed)

—

150

kHz

to

1

GHz;

conducted

(power

line)

—

150

kHz

to

25

MHz.

MECHANICAL

CHARACTERISTICS

Construction

Aluminum

alloy

c assis,

panel

and

cabinet.

Glass

laminate

etc ed

circuit

boards.

Finis

Anodized

front

panel.

Blue

vinyl-finis ed

cabinet

and

rear

panel.

Overall

Dimensions:

Measured

at

maximum

points;

15

inc es

ig ,

16-

7

/

0

inc es

wide,

24

inc es

deep.

ENVIRONMENTAL

CHARACTERISTICS

T e

Type

556

as

been

designed

to

operate

over

a

temper



ature

range

of

0°

C

to

+50°

C,

altitude

up

to

15,000

feet.

T e

non-operating

storage

temperature

range

is

—

40°

C

to

+65°

C,

altitude

up

to

50,000

feet.

After

storage

at

eit er

extreme,

t e

instrument

must

be

allowed

at

least

4

ours

time

for

all

components

to

return

to

t e

ambient

temperature

range

0°

C

to

+50°

C

before

operating.

Furt er

information

on

environmental

test

procedures

may

be

obtained

by

contacting

your

local

Tektronix

Field

Office

or

representative.

ACCESSORIES

Standard

accessories

supplied

wit

t e

Type

556

can

be

found

on

t e

last

pullo-ut

page

of

t e

Mec anical

Parts

List

Illustrations.

For

optional

accessories

see

t e

Tektronix,

Inc.

catalog.

-4

Type

556

SECTION

2

OPERATING

INSTRUCTIONS

C ange

information,

if

any,

affecting

t is

section

will

be

found

at

t e

rear

of

t e

manual.

General

T is

section

of

t e

manual

provides

for

t e

effective

use

of

t e

instrument

by

describing

t e

function

and

operation

of

t e

front

panel

controls

and

connectors,

listing

t e

first

time

and

general

operating

instructions

and

presenting

some

basic

applications.

Nomenclature

and

Terminology

For

reference

and

guidance,

t ese

terms

are

defined

as

t ey

are

used

in

t is

manual.

Alternate

Mode

—

A

time-s aring

met od

of

displaying

t e

output

signals

of

two

or

more

c annels

wit

a

single

cat ode

ray

tube

beam.

C annel

switc ing

is

sequential

and

occurs

at

t e

end

of

t e

sweep.

Chopped

Mode

—

A

time-s aring

met od

of

displaying

output

signals

of

two

or

more

c annels

wit

a

single

cat ode

ray

tube

beam,

in

sequence,

at

a

rate

not

referenced

to

t e

sweep.

Chopping

Rate

—

T e

rate

at

w ic

c annel

switc ing

occurs

in

C opped

Mode.

Chopping

Transient

Blanking

—

T e

process

of

blanking

t e

indicating

spot

during

t e

switc ing

periods

in

C opped

Mode.

Dual-Beam

Oscilloscope

—

An

oscilloscope

in

w ic

t e

cat ode

ray

tube

produces

two

separate

electron

beams

t at

may

be

individually

or

jointly

controlled.

Dual-Trace

—

A

mode

of

operation

in

w ic

a

single

beam

in

a

cat ode

ray

tube

is

s ared

by

two

signal

c annels.

Multi-Trace

—

A

mode

of

operation

in

w ic

a

single

beam

in

a

cat ode

ray

tube

is

s ared

by

two

or

more

signal

c an



nels.

Signal

Channel

—

A

signal

amplifying

circuit

in

a

plug-in

unit.

Wit

dual

and

multi-c annel

plug-ins,

t e

c annels

are

generally

designated

C annel

1

(or

A)

C annel

2

(B),

etc.

Power

Requirements

T is

instrument

may

be

operated

wit

power

from

eit er

a

115-volt

or

a

230-volt

(nominal)

power

source.

Wit

proper

positioning

of

t e

Line

Voltage

Selector

connectors,

t e

power

supply

circuit

will

provide

correct

DC

voltages

wit

adequate

regulations

wit

any

line

voltage

wit in

voltage

limits

of

90

to

136

volts

RMS

and

180

to

272

volts

RMS

and

frequency

limits

of

50

to

60

Hz.

T e

adjustable

turns

ratio

design

of

t e

power

transformer

provides

t e

means

of

making

t e

instrument

compatible

wit

t is

wide

range

of

power

source

voltages.

SN

2000-up

A

Line

Voltage

selector

assembly

is

provided

to

facilitate

c anging

t e

power

transformer

turns

ratio

(see

Fig.

2-1).

T e

assembly

contains

two

line

fuses

and

two

movable

pins

and

socket

type

connectors.

T e

two-position

connector

is

termed

t e

Voltage

Selector

and

t e

t ree-position

connector

is

termed

t e

Range

Selector.

Table

2-1

lists

t e

six

Voltages

and

Range

selector

com



binations

and

t e

line

voltage

ranges

t ey

s ould

be

used

wit .

Before

connecting

t e

instrument

to

a

power

source,

measure

t e

power

source

line

voltage

and

position

t e

Volt



age

and

Range

selectors

accordingly.

TABLE

2-

Voltage

Selector

position

Range

Selector

position

Will

provide

optimum

regulation

for

line

voltages

from

115

V

LO

90

to

110

volts

115

V

M

104

to

126

volts

115

V

HI

112

to

136

volts

230

V

LO

180

to

220

volts

230

V

M

208

to

252

volts

230

V

HI

224

to

272

volts

To

c ange

t e

power

transformer

from

one

regulating

range

configuration

to

anot er

use

t e

following

procedure:

1.

Disconnect

t e

instrument

from

t e

power

source.

2.

Loosen

t e

two

captive

screws

and

remove

t e

cover.

Since

t e

line

fuses

are

attac ed

to

t e

cover,

t ey

will

be

pulled

from

t eir

olders

wit

t e

cover.

3.

To

c ange

nominal

line

selections,

pull

t e

Voltage

Selector

until

its

pins

are.free

of

t e

sockets,

invert

t e

selec



tor

and

reseat

t e

pins

in

t e

desired

sockets.

NOTE

115-volt

to

230-volt

plug

adapters

are

not

sup



plied

wit

t is

instrument.

If

a

suitable

adapter

is

not

available,

it

may

be

necessary

to

c ange

t e

line-cord

plug.

4.

To

c ange

regulating

range

selections,

pull

t e

Range

selector

until

its

pins

are

free

of

t e

sockets,

move

it

to

t e

desired

range

position

and

seat

t e

pin

in

t e

sockets.

5.

Replace

t e

assembly

cover

and

t e

two

line

fuses.

Press

t e

cover

firmly

onto

t e

assembly

to

seat

t e

two

fuses

in

t eir

olders,

t en

tig ten

t e

captive

screws.

6.

T e

indicating

tabs

on

t e

selectors

will

be

protruding

t roug

t e

covers

to

indicate

t e

selected

regulating

range.

Always

c eck

t e

position

of

t ese

tabs

before

applying

power

to

t e

instrument.

2-

Operating

Instructions

—

Type

556

SN

00- 999

Instruments

wit

serial

numbers

100-1999,

unless

tagged

ot erwise,

are

connected

at

t e

factory

for

operation

at

115

volts

(nominal).

T e

power

transformer

as

eig t

primary

terminals

w ic

are

connected

to

solderless

pin

connectors

on

t e

Power

board.

T ese

quick-c ange

connectors

make

possible

operation

from

four

different

nominal

AC

voltages:

104,

115,

208

and

230

V,

50

to

60

Hz.

Fig.

2-2

illustrates

t e

jumper

and

lead

connections

required

for

operation

on

eac

of

t e

stated

line

voltages.

For

208

V

and

230

V

opera



tion,

t e

two

unused

jumpers

can

be

stored

on

t e

unused

pins

of

terminals

J

and

T.

All

lead

connections

to

t e

board

t at

are

not

s own

in

Fig.

2-2

remain

as

t ey

are.

No

c ange

in

fan

connections

is

required

w en

c anging

t e

connection

on

t e

board

as

directed

in

t e

illustration.

NOTE

Two

metal

tags

(printed

on

eac

side)

are

pro



vided

at

t e

rear

of

t e

instrument

to

indicate

t e

four

nominal

line

voltages.

If

t e

primary

wiring

is

c anged,

be

sure

to

use

t e

proper

tag

to

indi



cate

t e

voltage

for

w ic

t e

instrument

is

wired.

Temperature

considerations

To

reduce

operating

temperatures,

air

is

drawn

in

t roug

t e

filter

at

t e

rear

and

blown

forward

t roug

t e

instru



ment.

For

t e

most

efficient

air

circulation

and

eat

dis



sipation,

provide

at

least

t ree

inc es

clearance

at

t e

rear,

two

inc es

at

t e

sides

and

operate

t e

instrument

wit

t e

side

covers

installed.

If

t e

fan

becomes

inoperative

or

t e

air

circulation

is

obstructed,

t o

internal

temperatures

will

exceed

a

safe

operating

level

in

a

relatively

s ort

period

of

time.

To

prevent

damage

to

t o

components

from

excessive

temperaturos,

a

t ermal

cutout

switc

is

incorporated

in

t o

power

supply

circuitry.

T is

switc

is

designed

to

interrupt

power

to

t o

instrument

w en

t e

ambient

temperature

ex



ceeds

about

140°

F.

CAUTION

Since

t e

t ermal

cutout

switc

will

reset

w en

its

ambient

temperature

decreases

to

some

level

be



low

its

actuating

temperature,

set

t e

POWER

switc

to

OFF

before

attempting

to

remedy

t e

cause

of

t e

ig

temperature

condition.

CONTROLS

AND

CONNECTORS

Figure

2-3

s ows

t e

location

of

all

t e

instrument

operat



ing

controls

and

connectors.

A

brief

description

of

eac

type

of

control

and

connector

is

given

in

t e

following

table.

Controls

wit

t e

same

nomenclatures

generally

perform

identical

functions

for

t eir

respective

beams

and

a

descrip



tion

for

one

is

applicable

to

t e

ot er.

T ose

controls

wit

t e

same

nomenclature,

but

wit

differences

in

t eir

func



tions,

are

pointed

out

and

described

as

separate

typ

e

con



trols.

Some

of

t e

controls

and

connectors,

particularly

t ose

wit

complex

functions

or

multiple

applications,

are

de



scribed

in

greater

detail

under

General

Operating

Instruc



tions.

A

AND

B

TRIGGERING

CONTROLS

Source

Selects

triggering

signal

source,

Two

selec



tor

switc es

are

combined

under

t e

no



menclature

of

SOURCE

to

provide

t is

complex

switc ing

function.

T e

selections

of

t e

two

position

selector

switc

are:

LEFT:

From

left

plug-in

or

left

vertical

amplifier.

RIGHT:

From

rig t

plug-in

or

rig t

vertical

amplifier.

T e

selections

of

t e

four

posi



tion

selector

switc

are:

Fig.

2- .

Line

Voltage

Selector

assembly;

provided

in

instruments

with

serial

number

2000

and

up.

2-2