Tektronix 543B Manual de usuario

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INSTRUCTION

MANUAL

Serial

Number

________

scanned

by

matt

from

wellenkino.de

Tekfronix,

Inc.

S.W.

Millikan

Way

•

P.

0.

Box

500

®

Beaverton,

Oregon

Ä

Phone

Ml

-0161

•

Cables:

Tektronix

070- 29

6

TYPE

OSCILLOSCOPE

WARRANTY

All

Tektronix

instruments

are

warranted

against

defective

materials

and

workman



ship

for

one

year,

Tektronix

transformers,

manufactured

in

our

own

plant,

are

war



ranted

for

the

life

of

the

instrument.

Any

questions

with

respect

to

the

war



ranty

mentioned

above

should

be

taken

up

with

your

Tektronix

Field

Engineer.

Tektronix

repair

and

replacement-part

service

is

geared

directly

to

the

field,

there



fore

all

requests

for

repairs

and

replace



ment

parts

should

be

directed

to

the

Tek



tronix

Field

Office

or

Representative

in

your

area.

This

procedure

will

assure

you

the

fastest

possible

service.

Please

include

the

instrument

Type

and

Serial

number

with

all

requests

for

parts

or

service.

Specifications

and

price

change

priv



ileges

reserved.

Copyright

©

196

by

Tektronix,

Inc.,

Beaverton,

Oregon.

Printed

in

the

United

States

of

America.

Ail

rights

reserved.

Contents

of

this

publication

may

not

be

re



produced

in

any

form

without

permission

of

the

copyright

owner.

CONTENTS

Warranty

Section

1

Characteristics

Section

2

Operating

Instructions

Section

3

Circuit

Description

Section

Maintenance

Section

5

Calibration

Section

6

Parts

List

and

Diagrams

A

list

of

abbreviations

and

symbols

used

in

this

manual

will

be

found

on

page

6-1.

Change

information,

if

any,

is

located

at

the

rear

of

the

manual.

The

Type

543B

Oscilloscope

SECTION

1

CHARACTERISTICS

Introduction

The

Type

5 3B

Oscilloscope

is

a

versatile

laboratory

instrument

designed

for

use

with

all

Tektronix

lettered-

or

1

-series

plug-in

units.

VERTICAL

DEFLECTION

SYSTEM

Refer

to

Table

1-1

for

the

characteristics.

Trigger

Source

Selection

Trigger

Mode

Selection

Trigger

Signal

Requirements

SWEEP

GENERATOR

Sweep

Rates

0.1

µsec/cm

to

5

sec/cm

in

2

calibrated

steps.

Displayed

sweep-r

a

te

accuracy

is

±

3%.

An

unc

a

libraied

variable

sweep



rate

control

permits

the

sweep

to

be

slowed

to

at

least

0.

of

the

indicated

rate.

Sweep

Magnification

Any

sweep

rate

can

be

increased

2,

5,

10,

20,

50

or

100

times

by

expanding

the

center

portion

of

the

display

horizontally.

Sweep-rate

accuracy

is

within

~5%

in

the

magnified

positions

until

the

sweep

rate

exceeds

0.02

µsec/cm.

Internal,

external,

and

fine.

Automatic,

d

c

,

ac,

and

ac

low-frequency

rejection.

Internal

(ac):

Minimum

deflection

is

2

mm,

from

150

cps

to

10

m

c

,

rising

to

1

cm

at

30

me

with

less

than

1

mm

of

horizontal

jitter

at

a

sweep

rate

of

20

nsec/cm.

Internal

(de):

Minimum

deflection

is

6

mm

to

10

m

c

.

Internal

(ac

low-frequency

rejection):

Mini



mum

deflection

is

2

mm,

from

30

kc

to

10

m

c

,

rising

to

1

cm

at

30

m

c

with

less

than

1

mm

of

horizontal

jitter

at

a

sweep

rate

of

20

nsec/cm.

Internal

(automatic):

5

mm

deflection

at

150

cps.

Will

trigger

from

50

cps

to

10

m

c

with

increased

deflection.

External

(ac):

Minimum

amplitude

is

0.2

volt,

from

150

cps

to

10

m

c

,

rising

to

1

volt

at

30

m

c

with

less

thon

1

mm

of

hori



zontal

jitter

at

a

sweep

rate

of

20

nsec/cm.

Plug-In

Characteristics

for

the

Ty e

543B

Oscillosco e

TABLE

1-1

Plug-In

Unit

Calibrated

Deflection

Factor

Minimum

Bandpass

Risetime

Input

Capacitance

Type

1A1*

50

mv/cm

to

20

v/cm

5

mv/cm

dc

to

33

m

c

d

c

to

23

m

c

10.6

nsec

15.2

nsec

15

pf

Type

1A2*

50

mv/cm

to

20

v/cm

d

c

to

33

m

c

10.6

nsec

15

pf

Type

B

0.005

v/cm

to

20

v/cm

0.05

v/cm

to

20

v/cm

2

cps

to

12

m

c

d

c

to

20

m

c

30

nsec

18

nsec

7

pf

Type

CA*

0.05

v/cm

to

20

v/cm

d

c

io

2

m

c

15

nsec

20

pf

Type

D

1

mv/cm

to

50

v/cm

d

c

to

300

kc-2

m

c

0.18

,u.sec

7

pf

Type

E

50



v/cm

to

10

mv/cm

0.06

cps

to

20

kc-

60

kc

6

/xsec

50

pf

Type

G

0.05

v/cm

to

20

v/cm

d

c

to

20

m

c

18

nsec

7

pf

Type

H

5

mv/cm

to

20

v/cm

d

c

to

15

m

c

23

nsec

7

pf

Type

K

0.05

v/cm

to

20

v/cm

d

c

to

30

m

c

12

nsec

20

pf

Type

L

5

mv/cm

to

2

v/cm

0.05

v/cm

to

20

v/cm

3

cps

to

2

m

c

d

c

to

30

m

c

15

nsec

12

nsec

20

pf

Type

M*

0.02

v/cm

to

10

v/cm

d

c

to

20

m

c

17

nsec

7

pf

Type

N**

10

mv/cm

ac

to

600

m

c

0.6

nsec

50

input

Z

Type

O

x

*

0.05

v/cm

to

20

v/cm

d

c

to

25

m

c

1

nsec

7

pf

Type

Q**

10



Strain/cm

to

10,000



Strain/cm

d

c

to

6

kc

60

«sec

Adjustable

Type

R**

0.5

ma/cm

to

100

ma/cm

Type

S**

0.05

v/cm

to

0.5

v/cm

Type

Z**

0.05

v/cm

to

25

v/cm

d

c

to

13

m

c

27

nsec

2

pf

*

Multiple-trace

plug-in

units.

**

Special

feature

plug-in

units.

See

your

Tektronix

catalog

for

more

information

on

any

of

these

plug-in

units.

1-1

Characteristics

—

Ty e

543B/RM543B

External

(ac

low-frequency

rejection):

Mini



mum

deflection

is

0.2

volt

from

30

kc

to

10

m

c

,

rising

to

1

volt

at

30

m

c

with

less

than

1

mm

of

horizontal

jitter

at

a

sweep

rate

of

20

nsec/cm.

External

(d

c

):

Minimum

amplitude

is

0.2

volt

to

10

m

c

,

rising

to

1

volt

at

30

m

c

with

less

than

1

mm

of

horizontal

jitter

at

a

sweep

rate

of

20nsec/cm.

External

(automatic):

0.5

v

ot

150

cps.

Will

trigger

from

50

cps

to

10

m

c

with

increased

signal.

Accelerating

10

kv.

Potential

Usable

Viewing

Area

Focus

6-cm

high

by

10-cm

wide.

Vertical:

2

horizontal

lines/mm

distinguish



able

over

the

center

cm.

1.5

horizontal

lines/mm

distinguishable

in

the

top

and

bottom

1

cm.

HORIZONTAL

DEFLECTION

SYSTEM

The

following

characteristics

apply

when

the

HORIZONTAL

DISPLAY

switch

is

set

to

the

EXT

position.

Phosphor

Graticule

Deflection

Factor

A

calibrated

deflection

of

0.1,

1

or

10

volts/cm

with

the

VARIABLE

10-1

control

set

fully

clockwise.

The

VARIABLE

10-1

control

provides

at

least

a

10:1

attenua



tion

of

the

input

signal

when

it

is

turned

Frequency

Response

Input

Characteristics

fully

counterclockwise.

D

c

to

500

kc

at

maximum

gain

(30%

down).

1

megohm

paralleled

by

approximately

3

pf.

AMPLITUDE

CALIBRATOR

Output

Voltage

0.2

mvolts

to

100

volts

peak-to-peak

in

18

steps.

Frequency

Approximately

a

1-kc

square

wave.

Amplitude

Accuracy

Peak-to-peak

amplitude

accuracy

is

±3%

of

indicated

value.

The

special

output

from

the

.1

V

I

NTO

50



connector

is

accurate

to

within

±3%

of

the

indicated

value.

Horizontal:

2

time

markers./mm

distinguish



able

over

the

middle

8

cm.

1.5

time

markers/mm

distinguishable

in

the

first

and

tenth

cm.

Type

31

phosphor

is

normally

supplied.

Other

phosphors

are

available.

6

X

10

cm

with

vertical

and

horizontal

1-cm

divisions

with

2-mm

markings

on

the

centerlines.

Markings

for

measuring

rise



time

have

been

provided

a

t

the

2.5

cm

points

above

and

below

the

graticule

center

line.

Line

Voltage

Line

Frequency

Power

Consumption

POWER

SUPPLIES

108,

115,

122,

216,

230

or

2

volts.

Will

regulate

within

±10%

of

design-center

voltage.

50

to

60

and

00

cps.*

535

wa

t

ts

maximum.

“

ith

a

line

frequency

of

400

cycles,

a

special

fan

modification

is

required;

contact

your

local

Tektronix

Field

Representative.

MECHANICAL

Construction

Net

Weight

Front

panel

is

anodized.

Chassis

is

alumi



num

alloy.

81

pounds.

FRONT-PANEL

OUTPUT

SIGNALS

SAWTOOTH

OUT

Approximately

a

130-volt,

peak-to-peak

sawtooth

voltage

having

the

same

dura



tion

as

the

sweep.

Minimum

allowable

load

resistance

is

100

k.

-GATE

OUT

Approximately

a

20-volt

peak-to-peak

square-wave

pulse

having

the

same

dura



tion

as

the

sweep.

Minimum

dc

load

resis



tance

is

5

k.

VERT

SIG

OUT

Vertical

signal

output

connector.

Output

amplitude

is

at

least

1.2

vo

l

ts/cm

of

de



flection

on

the

crt.

Output

is

ac

coupled.

CATHODE-RAY

TUBE

Type

T5 70-31-2.

Unblanking

De

coupled.

ACCESSORIES

INCLUDED

Tektronix

Part

No.

2

Instruction

Manuals

070- 37

2

P6006

Probes

with

BNC

connectors

010-127

2

Adapters,

BNC

to

Binding

Post

103-033

1

Test

Lead

012-031

1

Crt

Protector

Plate

387-918

1

50-ohm

Cable,

BNC

to

BNC,

18

inches

long

012-076

1

3-wire

Power

Cord

161-010

1

3-

to

2-wire

Adapter

103-013

1

Adapter,

BNC

to

UHF

103-015

12

10-2

x

5

/

16

THS

Screws

212-533

12

10-32

x

5

/

16

THS

Screws

212-535

1-2

SECTION

2

OPERATING

INSTRUCTIONS

FUNCTION

OF

CONTROLS

AND

CONNECTORS

HORIZONTAL

DISPLAY

Selects

the

amplitude

point

on

the

trigger



ing

signal

where

sweep-triggering

occurs.

Adjusts

the

oscilloscope

for

a

stable

dis



played

waveform.

The

STABILITY

corrrol

can

be

set

to

the

PRESET

position

and

left

there.

This

position

provides

for

con



venient

triggering

since

only

the

TRIGGER



ING

LEVEL

control

needs

to

be

adjusted

to

obtain

a

stable

display.

TRIGGERING

MODE

AUTO:

Permits

normal

triggering

or

simple

waveforms

with

repetition

rates

higher

than

about

50

cps.

With

no

trigger

signai,

or

with

a

lower

repetition

rate,

the

trigger

circuit

free

runs

at

approximately

0

cps

and

triggers

t

he

time

base

at

this

rate,

pro



providing

a

reference

trace.

MAGNIFIER

Lamps

AC

LF

REJ:

Attenuates

trigger-signal

fre



quencies

below

about

17

kc,

allowing

the

trigger

circuit

to

respond

only

to

higher

frequencies.

AC:

Blocks

the

dc

component

of

the

trig



gering

signal

and

allows

triggering

to

take

place

only

on

the

changing

portion

of

the

signal.

With

frequencies

below

about

30

cps,

use

the

DC

position.

EXTERNAL

HORIZONTAL

VOLTS

/CM

VARIABLE

SINGLE

SWEEP

For

best

triggering

at

high

frequencies,

use

an

ac

coupling

position

of

the

TRIG



GERING

MODE

switch.

DC:

Permits

triggering

on

both

high-

and

low-frequency

(to

d

c

)

signals.

TRIGGER

SLOPE

Determines

whether

the

time

base

is

trig



gered

on

the

negative-

{

—

)

or

positive-

(+)

going

slope

of

the

signal.

LINE:

Uses

a

line-frequency

signal

as

a

trigger.

INT:

Uses

a

portion

of

the

signal

applied

to

the

vertical

deflection

plates

of

the

c

rt

as

a

trigger

signal.

EXT:

Provides

external

triggering

on

a

signal

applied

to

the

TRIGGER

INPUT

connector.

TIME,/CM

Selects

the

time-base

sweep

rate.

READY

Lamp

HORIZONTAL

POSITION

and

VERNIER

AMPLITUDE

CALIBRATOR

POWER

ON

INTENSITY

FOCUS

ASTIGMATISM

TIME/CM

VARIABLE

Provides

an

uncalibrated

sweep

rate

ad



justment.

The

sweep

rate

can

be

slowed

to

at

least

0.

X

any

setting

of

the

TIME/

CM

switch.

An

UNCALIBRATED

lamp

lights

when

the

VARIABLE

control

is

not

in

the

CALIBRATED

position.

TRACE

ROTATION

NORMAL

(X

1

)

and

SWEEP

MAGNIFIED

positions

expand

the

display

horizontally

by

the

amount

indicated.

Sweep-rate

ac



curacy

is

±:5%

in

the

magnified

posi



tions.

EXT

position

allows

an

external

signal

to

drive

the

horizontal

deflection

system.

The

horizontal

deflection

factor

is

set

by

the

EXTERNAL

HORIZONTAL

VOLTS/CM

switch

and

variable.

The

MAGNIFIER

ON

lamp

lights

when



ever

the

HORIZONTAL

DISPLAY

switch

is

in

any

of

the

SWEEP

MAGNIFIED

posi



tions.

The

MAGNIFIER

UNCALIBRATED

lamp

is

connected

to

light

whenver

the

sweep

rate

exceeds

the

maximum

cali



brated

rate

of

0.02

usec/cm.

This

lamp

will

not

light

as

long

as

the

setting

of

the

TIME/CM

switch,

divided

by

the

mag



nification

factor

is

not

faster

than

0.02



se

c

.

Selects

the

horizontal

deflection

factor

when

the

HORIZONTAL

DISPLAY

switch

is

set

to

EXT.

The

VARIABLE

control

must

be

fully

clockwise

when

using

the

cali



brated

horizontal

deflection

factors.

Permits

single

sweep

operation

at

ail

settings

of

the

HORIZONTAL

DISPLAY

switch

except

EXT.

Lights

when

time-base

circuit

is

ready

for

triggering

after

being

reset.

Positions

the

display

along

he

horizontal

axis

of

the

crt

.

Determines

the

peak-to-peak

voltage

avail



able

at

the

CAL

OUT

connector.

Toggle

switch

for

turning

the

instrument

power

on

and

off.

Controls

brightness

of

the

display.

Used

in

conjunction

with

the

INTENSITY

and

ASTIGMATISM

controls

for

obtaining

a

well-defined

display.

Used

in

conjunction

with

the

INTENSITY

and

FOCUS

controls

for

obtaining

a

well-

defined

display.

Permits

horizontal

alignment

of

the

trace

with

respect

to

the

horizontal

lines

of

the

graticule.

The

TRACE

ROTATION

con



trol

is

a

screwdriver

adjustment

concentric

with

the

ASTIGMATISM

control.

®L

2-1

TRIGGERING

LEVEL

STABILITY

O erating

Instructions

—

Ty e

543B/RM543B

SCALE

ILLUM

Varies

illumination

of

the

graticule

grid

lines.

Beam

Position

Four

neon

lamps

with

accompanying

arrows

indicate

the

direction

when

the

display

is

deflected

out

of

the

viewing

area.

TRIGGER

INPUT

Connector

for

applying

an

external

trigger

signal

to

the

time

base

when

TRIGGER

SLOPE

switch

is

set

to

the

EXT

position.

+

GATE

OUT

Supplies

approximately

a

20-volt

square



wave

pulse

when

the

time

base

is

oper-

a'ing.

Pulse

dur

a

tion

is

approximately

10.

5X

the

setting

of

the

TIME/CM

switch.

NORMAL

SWEEP

Power

Connections

Unless

otherwise

indicated,

the

Type

5 3B

is

shipped

with

rhe

power

transformer

and

fan

wired

for

1

15-volt

ac

input.

A

connection

diagram

on

the

side

of

the

trans



former

and

Fig.

2-1

shows

alternative

connections

for

other

input

voltages

to

the

power

transformer.

When

the

trans



former

is

changed

from

a

108,

115,

or

122

volts

to

216,

230,

or

2

volts

connection,

the

fan

wiring

must

be

changed.

Fig.

2-2

shows

the

fan

connections

for

each

voltage

range.

SAWTOOTH

OUTSupplies

the

sawtooth

voltage

of

the

time

base.

Peak

amplitude

is

about

—

130

volts.

EXTERNAL

HORIZ

INPUT

Jack

for

applyin

g

external

horizontal

sig

nal

when

the

'HORIZONTAL

DISPLAY

switch

is

set

to

EXT.

VERT

SIG

OUT

CRT

CATHODE

SELECTOR

(rear

panel)

EXTERNAL

CRT

CATHODE

Vertical

signal

output

connector.

Output

amplitude

is

approximately

1.2

volts/cm

of

deflection.

Provides

blanking

of

between-channe!

switching

transients

(in

the

CHOPPED

BLANKING

position)

when

using

multi



channel

plug-in

units

in

the

chopped

mode.

With

the

ground

strap

disconnected,

this

connector

applies

Z-axis

modulation

sig



nals

to

the

crt

cathode.

The

Z-axis

signa's

should

be

at

leas

’

20

volts

in

amplitude

to

cause

intensity

modulation.

Always

have

the

ground

strap

connected

except

when

applying

Z-axis

modulating

signals.

Fig.

2-2.

Fan

connections

for

100-124

volts

and

220-248

volts.

See

the

label

on

the

side

of

T601

for

the

placement

of

jumper

leads.

Fig.

2-1.

Transformer

connections

for

108

to

244

volt,

50

Io

60

cps

and

400

cps

operation.

Sweep

Triggering

Proper

sweep

triggering

is

essentia'

for

a

stable

presenta



tion

of

an

input

signal.

For

a

stable

display,

the

sweep

must

be

triggered

at

the

same

time

relative

to

the

displayed

signal.

Thus,

the

sweep

must

be

triggered

by

the

input

signal

or

by

some

external

signal

that

has

a

fixed

time

relationship

with

the

displayed

signal.

The

external

trigger

signal

must

be

the

same

frequency

or

a

multiple

of

the

input

signal.

Selecting

the

Trigger

Source

The

TRIGGER

SLOPE

switch

selects

one

of

a

variety

of

possible

triggering

signcis.

For

most

applications,

T

he

sweep

can

be

triggered

internally

from

the

clisp

ayed

signal.

This

occurs

with

the

TRIGGER-SLOPE

switch

set

at

either

+

or

-

INT.

The

LINE

positions

of

the

TRIGGER

SLOPE

switch

connect

a

line-frequency

signal

to

the

triggering

input.

Line

trigger



ing

is

useful

whenever

the

input

signal

is

frequency-related

to

the

line

frequency.

To

trigger

the

t

i

me

base

from

an

external

signal,

set

the

TRIGGER

SLOPE

switch

to

an

EXT

position

and

connect

the

2-2

O erating

Instructions

—

Ty e

543B/RM543B

TRIGGER

SLOPE

TRIGGER

SLOPE

Fig.

2-3.

Effects

of

the

TRIGGERING

LEVEL

ond

SLOPE

controls.

2-3

O erating

Instructions

—

Ty e

543B/RM543B

trigger

signal

to

the

TRIGGER

INPUT

connector.

External

triggering

is

often

used

when

signal

tracing

in

amplifiers,

phase-shift

networks,

and

wave-shaping

circuits.

The

signal

from

a

single

point

in

the

circuit

can

be

used

as

an

external

trigger

signal.

With

this

arrangement,

it

is

possible

to

observe

the

polarity,

shaping

and/or

amplification

of

a

signal

at

various

points

through

the

circuit

without

resetting

the

triggering

controls

for

each

new

display.

Selecting

Triggering

Mode

Four

means

of

trigger

coupling

are

available

with

the

TRIGGERING

MODE

switch.

The

different

coupling

posi



tions

permit

you

to

accept

or

reject

certain

frequency

com



ponents

of

the

triggering

signal.

With

the

switch

set

at

AC,

the

time

base

can

be

triggered

with

all

frequency

components

of

the

triggering

signal

within

the

trigger

amplifier

bandpass,

including

dc

levels.

With

the

switch

set

at

AC

LF

REJ,

dc

and

low-frequency

signals

(below

about

17

kc)

arc

rejected

or

attenuated.

Thus,

the

trigger

circuit

will

respond

best

to

the

higher-frequency

components

of

the

triggering

signal.

With

the

switch

set

to

AUTO,

proper

triggering

auto



matically

takes

place

providing

that

rhe

signal

waveform

is

comparatively

simple

and

approximately

symmetrical.

With

no

trigger

signal,

or

with

a

lower

repetition

rate,

the

trigger

circuit

free

runs

at

approximately

40

cps

and

triggers

the

time

base

at

this

rate,

providing

a

reference

trace.

In

general,

use

AC

coupling.

However,

it

will

be

necessary

to

use

DC

coupling

for

very

low-frequency

signals.

When

line-frequency

hum

is

mixed

with

the

triggering

signal,

it

is

best

to

use

AC

LF

REJ

coupling

so

that

triggering

takes

place

only

on

the

signa!

of

interest

(if

the

signal

of

interest

contains

frequency

components

above

about

17

kc).

The

AC

LF

REJ

position

is

also

useful

when

triggering

internally

from

multitrace

plug-in

units

operated

in

the

alternate

dual-trace

mode.

AC

LF

REJ

coupling

has

a

faster

recovery

time

when

subjected

to

the

alternate

d

c

levels

from

the

multitrace

plug-in

unit.

Selecting

Trigger

Slope

The

TRIGGER

SLOPE

switch

determines

whether

the

trigger



ing

circuit

responds

on

the

rising

(

+

setting)

or

the

falling

(

—

setting)

portion

of

the

triggering

signal.

When

several

cycles

of

a

signal

appear

in

the

display,

the

setting

of

the

TRIGGER

SLOPE

switch

will

probably

be

unimportant.

How



ever,

if

you

wish

to

look

at

only

a

certain

portion

of

a

cycle,

the

TRIGGER

SLOPE

switch

will

help

start

the

display

on

the

desired

slope

of

the

input

signal.

Fig.

2-3

illustrates

the

effect

of

both

the

TRIGGER

SLOPE

and

TRIGGERING

LEVEL

controls.

Setting

Stability

Control

In

nearly

all

triggering

applications,

satisfactory

opera



tion

can

be

obtained

with

the

STABILITY

control

in

the

PRESET

(fully

counterclockwise)

position.

The

PRESET

posi



tion

has

the

advantage

of

requiring

no

further

adjustment

of

the

STABILITY

control

when

switching

from

one

triggering

signal

to

another.

However,

if

stable

triggering

becomes

difficult

with

the

STABILITY

control

at

PRESET,

it

will

be

necessary

to

adjust

the

control

for

proper

triggering.

To

adjust

the

STABILITY

control,

place

the

TRIGGERING

LEVEL

control

in

the

fully

counterclockwise

position,

then

turn

the

STABILITY

control

slowly

clockwise

until

a

trace

appears

on

the

crt.

The

correct

setting

is

obtained

by

turning

the

control

counterclockwise

three

to

five

degrees

from

the

point

where

the

trace

appears.

Setting

Triggering

Level

The

TRIGGERING

LEVEL

control

determines

the

amplitude

point

on

the

signal

where

triggering

occurs.

The

trigger

circuit

is

most

sensitive

to

ac

triggering

signals

with

the

TRIGGERING

LEVEL

control

set

near

zero.

Moving

the

TRIGGERING

LEVEL

control

in

the

+

(plus)

direction

causes

the

trigger

circuit

to

respond

at

some

higher

positive

amplitude

on

rhe

triggering

signal.

Moving

the

TRIGGERING

LEVEL

control

in

the

—

(minus)

direction

causes

the

trigger

circuit

to

respond

at

some

higher

negative

amplitude

on

the

triggering

signal.

Selecting

Time/Cm

(Sweep

Rate)

The

TIME/CM

and

HORIZONTAL

DISPLAY

switches

con

trol

sweep

rate.

The

TIME/CM

and

HORIZONTAL

DISPLAY

switches

allow

you

to

view

an

applied

signal

at

a

wide

variety

of

cali



brated

sweep

rates.

When

making

time

measurements

from

the

crt,

be

sure

the

VARIABLE

control

is

set

to

CALIBRATED.

When

the

HORIZONTAL

DISPLAY

switch

is

set

to

NORMAL

(X

1

),

the

TIME/CM

switch

indicates

the

true

sweep

rate.

However,

with

the

HORIZONTAL

DISPLAY

switch

set

to

a

sweep

magnified

position,

the

setting

of

the

TIME/CM

switch

must

be

divided

by

the

magnified

amount

to

determine

the

true

sweep

rate.

For

example,

assume

that

the

TIME/CM

switch

is

set

at

1

mSEC

and

the

HORI



ZONTAL

DISPLAY

switch

is

set

to

X5.

In

this

case,

the

true

sweep

rate

would

be

1

(msec)

divided

by

5

(magnified

amount);

resulting

in

a

displayed

sweep

ra

t

e

of

0.2

msec/

div.

Fig.

2-

illustrates

how

to

make

time

measurements

from

the

graticule.

2-