Tektronix 3B3 Manual de usuario

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INSTRUCTION

MAN

UAL

Serial

Number

BFE3

Tektronix,

Inc.

S.W.

Millikan

Way

@

P.O.

Box

500

@

Beaverton,

Oregon

070-365

Phone

Mi

4-0161

@

Cables:

Tektronix

863

oe

a

Oy

~

a

i

oe

-ee

e

ee

Type

3B3

TYPE

3B3

TIME

BASE

DELAYED

SWEEP

TRIGGERING

SLOPE

COUBLING

SOlgrE

ExT.

¥

¥

“#

TRIG.

™

oc

*)

ext.

|

VARIABLE

TIME/DIV.

ano

DELAY

TIME

RANGE

(PULL

5X

MAG.)

UNCAL.,

vpig7

MODE

—a\'

8

as

INTEND

OL

INTEN,

\

!

\

Fs

SwP.

DELAY

TIME

NORMAL

or

DELAYING

SWEEP

TRIGGERING

SLOPE

COUPLING

SOURCE

ay

AUTO.

g)

INT.

EXT.

Ls

SINGLE

_

aoa

«-@®

TEKTRONIX,

AORTLAND,

OREGON,

U.S.A.

SECTION

I

CHARACTERISTICS

General

The

Type

3B3

Time

Base

Unit

is

a

plug-in

time

base

generator

designed

for

use

with

Tektronix

Types

561A,

RM561A,

564,

567

and

RM567

Oscilloscopes.

The

Type

3B3

provides

normal

or

delayed

sweeps

at

20

calibrated

rates

from

0.5

microseconds

per

division

to

1

second

per

division.

In

delayed

sweep

operation,

the

Type

3B3

gives

continuous

calibrated

sweep

delay

from

0.5

microsecond

to

10

seconds

after

receipt

of

a

triggering

impulse.

Sweep

Rates

Both

normal

and

delayed

sweep

rates

from

0.5

micro-

second

per

division

to

1

second

per

division

in

20

cali-

brated

steps.

A

variable

control

provides

uncalibrated

sweep

rates

between

steps

and

also

extends

the

slower

rate

to

approximately

2.5

seconds

per

division.

Calibrated

sweep

rates

for

both

normal

and

delayed

sweeps

are

typically

within

1%,

and

in

all

cases

within

3%

of

the

TIME/DIV.

and

DELAY

TIME

RANGE

switch

settings.

Sweep

Magnification

The

display

can

be

magnified

5

times,

extending

both

the

normal

and

delayed

sweep

rates

to

0.1

microsecond

per

division.

Sweep

rate

accuracy

with

the

5X

magnification

remains

within

5%

of

the

TIME/DIV.

and

DELAY

TIME

RANGE

switch

settings.

Sweep

Delay

The

calibrated

sweep

delay

is

continuously

variable

from

0.5

microsecond

to

10

seconds.

Delay

accuracy

is

1%

of

full

scale

reading,

and

delay

time

linearity

is

within

0.2%

of

full

scale

from

5

microseconds

to

2

seconds

of

delay.

Time

jitter

is

less

than

1

part

in

20,000

of

the

maximum

available

delay

interval.

Single

Sweep

All

modes

of

operation

can

be

displayed

as

a

single

sweep

for

photographic

recording.

Triggering

Modes,

Normal

Sweep

Automatic

(15

cps

to

10

mcs),

ac-

or

de-coupled,

+

or

—

slope,

internal

or

external

source.

Triggering

Modes,

Delayed

Sweep

Ac-

or

de-coupled,

+

or

—

slope,

internal

or

external

source.

Internal

Triggering

Requirements,

Either

Time

Base

internal

triggering

with

signals

in

the

frequency

range

from

dc

to

5

mc

requires

a

trigger

amplitude

of

0.2

major

divisions

of

vertical

deflection.

Above

5mc,

the

trigger

re-

quirements

increase,

and

at

10

mc,

a

trigger

amplitude

of

0.5

major

division

of

vertical

deflection

is

required.

External

Triggering

Requirements,

Either

Time

Base

External

triggering

with

signals

in

the

frequency

range

from

de

to

5mc

requires

a

trigger

amplitude

of

0.5

volts.

Above

5mc

the

trigger

requirements

increase

and

at

10

mc,

a

trigger

amplitude

of

1.25

volts

is

required.

Maximum

triggering

signal

is

15

volts

direct,

or

150

volts

through

in-

ternal

attenuator

(operated

by

front

panel

switch).

If

ac

coupling

is

used,

up

to

500

volts

total,

de

and

ac

peak

combined,

may

be

applied

so

long

as

the

ac

component

does

not

exceed

150

volts.

Construction

Aluminum-alloy

chassis.

Front

panel

photo-etched

and

anodized.

Weight

5

pounds

4

ounces.

NOTES

SECTION

2

OPERATING

INSTRUCTIONS

TABLE

2-1

(Cont'd)

General

This

section

explains

the

use

of

the

Type

3B3

as

part

of

an

oscilloscope

system,

the

function

of

the

Type

3B3's

front

panel

controls,

operating

procedures

peculiar

to

the

Type

3B3,

and

how

to

display

a

signal.

Use

The

Type

3B3

Plug-In

Time

Base

Generator

is

normally

used

as

part

of

an

oscilloscope

system

composed

of

the

Type

3B3,

one

of

the

Tektronix

oscilloscopes

listed

in

Section

1,

and

an

appropriate

vertical

amplifier

plug-in.

When

properly

operated,

the

system

can

(a)

determine

if

a

certain

event

is

happening,

(b}

make

accurate

measurements

of

the

event,

and

{c}

display

the

representation

of

the

event

in

a

manner

that

permits

photographing.

The

functions

of

the

Type

3B3

in

such

a

system

are

threefold:

it

provides

accurate

time

bases

for

precisely

measuring

the

time

dimensions

of

the

event

being

analyzed;

it

provides

a

versatile

trigger

cir-

cuit

to

assure

positive

synchronization

of

the

time

bases

with

the

event,

and

the

single

sweep

feature

provides

exposure

control

when

the

display

is

to

be

photographed.

In

as-

sembling

an

oscilloscope

system,

the

Type

3B3

is

inserted

in

the

X-axis

(right

hand)

opening

of

the

oscilloscope.

The

vertical

amplifier

plug-in

(a

non-sampling

vertical

amplifier

of

the

‘3’

series

such

as

the

Type

3AT)

is

inserted

in

the

Y-axis

(left-hand}

opening.

Function

of

Front

Panel

Controls

and

Connectors

The

front

panel

controls

and

connectors

on

the

Type

3B3

are

grouped

into

blocks

according

to

the

sweep

circuit

in

which

they

function.

The

blocks

of

controls

are

outlined

by

a

heavy

black

line

printed

on

the

front

panel.

Controls

common

to

both

sweep

circuits

are

placed

between

the

two

blocks

with

the

exception

of

the

screwdriver

adjustable

SWEEP

CAL.

potentiometer

which

is

located

in

the

bottom

right-hand

corner

of

the

front

panel.

Overcrowding

of

the

front

panel

is

avoided

by

giving

some

controls

multiple

functions

and

making

others

concentric.

Table

2-1

lists

the

function

of

the

individual

controls

and

connectors.

Control

Setting

|

Function

SLOPE

+

Sets

the

delayed-sweep

trig-

gering

circuit

to

trigger

on

the

rising

{+)

slope

of

the

trigger-

ing

signal.

Sets

the

delayed-sweep

trig-

gering

circuit

to

trigger

on

the

falling

(—)

slope

of

the

trig-

gering

signal.

COUPLING

AC.

Inserts

blocking

capacitor

in

the

delayed

sweep

trigger

cir-

cuit

to

block

any

de

compon-

ents

of

the

triggering

signal.

DC

Shunts

triggering

signal

around

blocking

capacitor

and

passes

it

directly

to

delayed

sweep

trigger

circuit.

SOURCE

INT.

Switches

input

of

delayed

sweep

trigger

circuit

to

trigger

source

(vertical

plug-in)

within

the

oscilloscope

system.

EXT.

Switches

input

of

delayed

sweep

trigger

circuit

to

EXT.

TRIG.

connector

on

front

panel.

EXT.

TRIG.

(Connector)

Provides

means

of

connecting

external

trigger

signal

to

the

delayed

sweep

trigger

circuit.

Controls

Common

to

Both

Sweeps

MODE

NORM.

Switches

circuits

in

the

Type

3B3

so

that; the

normal

(de-

laying)

sweep

is

displayed

on

the

crt,

the

sweep

rate

is

set

by

the

normal

sweep

_

timing

switch,

and

sweep

triggering

is

selected

by

the

NORMAL

or

DELAYING

SWEEP

TRIGGER-

ING

controls.

TABLE

2-1

Function

of

Front-Panel

Controls

and

Connectors

Control

[|

Setting

|

Function

Delayed

Sweep

Triggering

Block

LEVEL

Pushed

in

|

When

turned,

sets

the

point

on

(PULL

EXT.

the

slope

of

the

input

wave-

TRIG,

ATTEN.)

form

at

which

the

delayed

sweep

is

triggered.

Pulled

out

|

Switches

an

internal

10X

at-

tenuator

into

the

external

trig-

ger

circuit,

permitting

use

of

external

triggering

signals

in

the

15-

to

150-volt

range.

When

turned,

sets

the

point

on

the

slope

of

the

external

trig-

gering

signal

at

which

the

de-

layed

sweep

is

triggered.

INTEN.

Switches

circuits

so

that

the

de-

layed

sweep

intensifies

a

por-

tion

of

the

normal

sweep,

the

intensified

zone

starts

at

a

point

on

the

normal

sweep

de-

termined

by

the

setting

of

the

DELAY

TIME

control,

the

width

of

the

intensified

zone

is

deter-

mined

by

the

setting

of

the

DELAYED

SWEEP

control,

and

the

DELAYED

SWEEP

TRIGGER-

ING

controls

are

disconnected.

TRIG.

INTEN.

Same

as

INTEN.

setting

except

that

DELAYED

SWEEP

TRIG-

GERING

controls

are

now

con-

nected

and

the

start

of

the

in-

tensified

zone

depends

upon

2-1

Operating

Instructions

—

Type

3B3

TABLE

2-1

(Coni'd}

TABLE

2-1

(Cont'd)

Control

Setting

|

Function

Control

|

Setting

|

Function

the

settings

of

the

DELAY

click

in

the

desired

direction,

TIME

and

DELAYED

SWEEP

then

release.

TRIGGERING

controls.

DELAYED

Any

Selects

and

indicates

the

posi-

DLY'D

Switches

the

Type

3B3

circuits

SWEEP

tion

of

the

delayed

sweep

tim-

SWP.

so

that,

the

crt

display

is

the

ing

switch.

The

white

dot

indi-

delayed

sweep

only;

the

de-

cates

sweep

time

duration

layed

sweep

starts

at

a

point

divided

by

10,

or

time

per

divi-

on

the

normal

sweep

deter-

sion.

(See

explanation

of

mined

by

the

setting

of

the

TIME/DIV

AND

DELAY

TIME

DELAY

TIME

control,

and

the

RANGE

SCALE.)

When

the

DELAYED

SWEEP

TRIGGER-

white

dot

is

located

between

ING

Controls

are

disconnected.

the

two

black

lines

on

the

clear

TRIG.

Same

as

DLY'D

SWP.

setting

plastic

ring,

this

control

also

DLY’D

except

that

the

DELAYED

positions

the

normal

sweep

tim-

SWP.

|

SWEEP

TRIGGERING

controls

ing_switch.

are

connected,

and

the

start

of

VARIABLE

UNCAL.

|

Provides variable (uncalibrated)

the

delayed

sweep

is

determin-

sweep

rates

in

between

the

fix-

ed

by

settings

of

the

DELAY

ed

steps

of

the

sweep

timing

TIME

and

the

DELAYED

SWEEP

switches

and

lights

indicator

TRIGGERING

controls.

light

to

warn

that

sweep

is

un-

POSITION

Pushed

in

|

Positions

trace

on

crt

when

calibrated.

When

the

MODE

(PULL

5X

|

Pulled

out

|

turned.

Switches

in

5X

magni-

control

is

in

NORM.

position,

MAG.)

fication

circuit.

Positions

trace

the

VARIABLE

control

varies

on

crt

when

turned.

the

rate

of

the

normal

sweep.

:

a

;

In

all

other

positions

of

the

TIME/DIV

Fixed

This

is

a

scale

printed

on

the

MODE

control,

the

variable

AND

DELAY

front

panel.

The

scale

is

com-

control

is

in

the

delayed

TIME

RANGE

mon

to

both

the

normal

sweep

sweep,

Seatel

aches

owen

“the

MODE

CAL.

Switches

off

the

UNCAL.

light.

control

is

in

TRIG.

INTEN.,

SWEEP

CAL.

variable

|

Provides

a

means

of

compen-

NORM.,

or

INTEN.

positions,

({screw-

|

sating

for

differences

in

hori-

the

scale

indicates

the

time

per

driver

|

zontal

sensitivity

when

chang-

division

of

the

normal sweep.

adjust-

|

ing

the

Type

3B3

from

one

It

also

indicates

1/10th

the

ment)

oscilloscope

system

to

another.

time

duration

of

the

delayed

;

:

;

sweep.

In

both

DLY'D

SWP.

Normal

or

Delaying

Sweep

Triggering

Block

positions

of

the

MODE

control,

DELAY

TIME

|

variable

|

When

the

MODE

control

is

in

the

scale

indicates

time

per

INTEN.

or

DLY’'D

SWP.

posi-

division

of

the

delayed

sweep,

tions

the

DELAY

TIME

control

and

1/10

of

the

normal

sweep

determines

the

point

on

the

delay

time

range.

normal

sweep

at

which

the

de-

TIME/DIV

Any

Selects

and

indicates

the

posi-

layed

sweep

starts.

When

the

AND

DELAY

tion

of

the

normal

sweep

tim-

MODE

control

is

in

either

TRIG.

TIME

RANGE

ing

switch.

This

control

is

the

position,

the

DELAY

TIME

con-

(Control)

clear

plastic

ring

located

be-

trol

determines

the

point

on

tween

the

DELAYED

SWEEP

the

normal

sweep

at

which

control

and

the

TIME/DIV.

the

delayed

sweep

becomes

AND

DELAY

TIME

RANGE

triggerable.

Delay

time

is

scale.

Position

of

the

normal

read

by

multiplying

the

normal

sweep

timing

switch

is

indicat-

sweep

DELAY

TIME

RANGE

ed

by

two

black

lines

on

the

setting

by

the

reading

of

the

control.

When

the

white

dot

DELAY

TIME

dial.

The

ten

on

the

DELAYED

SWEEP

con-

major

divisions

on

the

DELAY

trol

is

positioned

between

the

TIME

dial

are

units,

the

minor

two

black

lines

on

the

clear

divisions

are

decimal.

plastic

ring,

the

two

sweep

Single

Sweep

NORM.

|

Switches

single

sweep

feature

timing

switches

lock

together

off

and

are

both

turned

by

the

:

DELAYED

SWEEP

controls.

To

SINGLE

|

Switches

the

single

sweep

fea-

unlock,

pull

the

DELAYED

SWEEP

|

ture

on.

SWEEP

control

out,

turn

one

RESET

Resets

the

single

sweep

circuit.

2-2

@

TABLE

2-1

(Coni'd)

Control

Setting

Function

For

single

sweep

operation

of

the

Type

3B3,

push

the

single

sweep

switch

down

to

RESET,

then

release.

If

a

trigger

signal

is

present,

a

single

sweep

will

appear

on

the

crt.

If

there

is

no

trigger

signal

present,

the

READY

light

will

turn

on

and

the

single

sweep

will

occur

when

a

trigger

signal

is

appli-

ed.

LEVEL

(PULL

EXT.

TRIG.

ATTEN.)

Pushed

in

When

turned,

sets

the

point

on

the

slope

of

the

input

wave-

form

at

which

the

normal

sweep

is

triggered.

Pulled

out

Switches

an

internal

10X

at-

fenuator

into

the

normal

sweep

external

trigger

circuit,

permit-

ting

use

of

external

triggering

signals

in

the

15-

to

150-volft

range.

When

turned,

sets

the

point

on

the

slope

of

the

ex-

ternal

triggering

signal

at

which

the

normal

sweep

is

trig-

gered.

SLOPE

Sets

the

normal

sweep

trig-

gering

circuit

to

trigger

on

the

rising

(++)

slope

of

the

trigger-

ing

signal.

Sets

the

normal

sweep

trig-

gering

circuit

to

trigger

on

the

falling

(—)

slope

of

the

trigger-

ing

signal.

COUPLING

AUTO.

Switches

the

normal

sweep

to

free-run

operation.

However,

a

suitable

trigger

will

override

the

auto

circuitry

and

trigger

the

sweep.

AC

Inserts

blocking

capacitor

in

the

normal

sweep

trigger

cir-

cuit

to

block

any

de

compon-

ents

of

the

triggering

signal.

DC

Shunts

triggering

signal

around

blocking

capacitor

and

passes

it

directly

to

normal

sweep

trig-

ger

circuit.

SOURCE

INT.

Switches

input

of

normal

sweep

trigger

circuit

to

trigger

source

(vertical

plug-in)

within

the

os-

cilloscope

system.

LINE

Applies

60

cycle

triggering

sig-

nal

to

normal

sweep

circuit.

EXT.

Switches

input

of

normal

sweep

trigger

circuit

to

EXT.

TRIG.

connector

on

front

panel.

EXT.

TRIG.

(Connector)

Provides

means

of

connecting

external

trigger

signal

to

the

normal

sweep

trigger

circuit.

Operating

Instructions

—

Type

3B3

First

Time

Operation

The

steps

that

follow

are

designed

to

instruct

the

opera-

tor

in

the

use

of

the

Type

3B3.

The

steps

cover

the

controls

to

use,

how

and

when

to

use

it,

and

the

expected

results.

Normal

Sweep

Triggering

Controls

1,

Preset

the

Type

3B3

controls

as

follows:

MODE

NORM.

POSITION

Center

of

range

and

pushed

in

DE-

LAYED

SWEEP.

Line

up

the

white

dot

between

the

two

black

lines

on

the

clear

plastic

ring,

then

set

the

two

black

lines

to

straddle

the

5mSEC

position

on

the

TIME/DIV

AND

DELAY

TIME

RANGE

scale.

VARIABLE

CALIB.

NORMAL

OR

DELAYING

SWEEP

TRIGGERING:

LEVEL

Center

of

range

and

pushed

in.

COUPLING

AUTO.

SOURCE

INT,

Single

Sweep

NORM.

2.

Turn

the

instrument

on

and

connect

a

cable

from

the

oscilloscope

calibrator

to

the

input

connector

on

the

vertical

amplifier

plug-in.

3.

Set

the

calibrator

output

for

1

volt

and

adjust

the

VOLTS/DIV.

switch

on

the

vertical

amplifier

plug-in

for

several

divisions

of

vertical

deflection.

There

should

now

be

several

cycles

of

a

steady

(triggered)

calibrator

waveform

on

the

ert.

4.

Turn

the

LEVEL

control

fully

clockwise.

The

display

should

float

(free-run)

across

the

crt.

Now

return

the

control

slowly

toward

the

center

until

the

display

seems

to

lock

into

a

steady

position.

Turn

the

control

fully

counterclockwise;

again

the

display

should

float.

Turn

toward

the

center

until

the

display

locks

into

a

steady

position.

Try

this

several

times

from

both

ex-

tremes

of

the

control.

When

the

display

locks

into

a

steady

position,

the

sweep

is

triggered.

5.

Set

the

COUPLING

switch

to

DC.

Turn

the

LEVEL

control

to

center.

The display

should

be

steady.

Now

turn

the

control

away

from

center;

notice

that

instead

of

free-running,

the

trace

disappears.

6.

Set

the

COUPLING

switch

to

AC;

the

controls

should

have

the

same

effect

as

in

step

5.

7.

Notice

that

the

display

starts

at

either

the

top

or

the

bottom

of

a

pulse.

Set the

SLOPE

switch

to

the

op-

posite

polarity;

the

trace

should

reverse

and

start

opposite

to

its

first

condition.

8.

Connect

a

cable

from

the

calibrator

to

the

NORMAL

or

DELAYING

SWEEP

TRIGGERING,

EXT.

TRIG.

con-

nector.

Set the

SOURCE

switch

to

EXT.

9.

Repeat

steps

4

through

7.

Notice

that

the

trigger

controls

work

the

same

as

for

interna!

trigger

signals

except

that

the

LEVEL

adjustment

may

be

more

critical.

External

trigger signals

should

be

used

in

certain

ap-

plications,

and

these

are

explained

later

in

the

text.

2-3

Operating

Instructions

—

Type

3B3

Delayed

Sweep

Controls

1.

Set the

NORMAL

OR

DELAYING

SWEEP

TRIGGER-

ING-SOURCE

switch

to

INT.,

COUPLING

to

AUTO.,

and

adjust

the

controls

for

a

steady

display.

2.

Set

the

DELAY

TIME

control

to

5.00

and

turn

the

MODE

control

to

INTEN.

(to

the

right

of

NORM.)

3.

Pull

the

DELAYED

SWEEP

control

out

and

turn

it

one

click

to

the

right.

Adjust

the

INTENSITY

control

on

the

oscilloscope

and

notice

that

a

portion

of

the

dis-

play

is

intensified.

Turn

the

DELAY

TIME

control

and

the

intensified

portion

moves

across

the

crt.

4.

Turn

the

DELAYED SWEEP

control

further

to

the

right.

Each

click

makes

the

intensified

display smailer

al-

though

it

can

still

be

moved

by

the

DELAY

TIME

con-

trol.

5.

Turn

the

MODE

control

to

DLY’D

SWP

(on

the

right).

The

intensified

zone

seen

in

the

previous

step

should

expand

and

cover

the

full

width

of

the

crt.

The

width

of

the

intensified

zone

set

in

step

4

is

always

ex-

panded

to

the

full

width

of

the

ert

when

the

MODE

control

is

turned

to

DLY'D

SWP.

The

following

steps

cover

the

DELAYED

SWEEP

TRIGGER-

ING

controls

at

the

top

of

the

Type

3B3.

1.

Return

the

MODE

control

to

NORM.

and

the

TIME/-

DIV

and

DELAY

TIME

RANGE

controls

to

5

mSEC.

2.

Set

the

DELAYED SWEEP

TRIGGERING

controls

as

follows:

LEVEL

fully

counterclockwise

SLOPE

+

COUPLING

AC

SOURCE

INT.

3.

Turn

the

MODE

control

to

TRIG.

INTEN.

and

adjust

the

INTENSITY

control

so

that

the

display

is

barely

visible.

Turn

the

Delayed

Sweep

LEVEL

control

through

its

range;

notice

a

portion

of

the

trace

intensifies

as

the

control

passes

midrange.

Leave

the

contro!

at

mid-

range.

4.

Pull

out

the

DELAYED SWEEP

control

and

turn

it

sev-

eral

clicks

to

the

right.

The

intensified

portion

of

the

display

will

get

smaller.

5.

Turn

the

MODE

control

to

TRIG.

DLY'D

SWP;

the

in-

tensified

portion

of

the

display

expands

across

the

full

width

of

the

crt.

6.

Set

the

delayed

sweep

SLOPE

control

to

the

opposite

polarity;

the

display

should

invert

and

remain

stable.

7.

Set

the

delayed

sweep

COUPLING

switch

to

DC;

the

display

may

disappear.

Readjust

the

delayed

sweep

LEVEL

control

and

the

display

should

return.

8.

Connect

a

cable from

the

calibrator

to

the

Delayed

sweep

EXT.

TRIG.

jack.

Set the

SOURCE

control

to

EXT.

Adjust

the

delayed

sweep

LEVEL

control,

if

necessary,

until

the

trace

appears.

The

following

description

covers

single

sweep

operation.

Single

sweep

can

be

used

with

either

normal

or

delayed

sweep.

2-4

First

set

the

controls

for

a

normal

triggered

display

(use

INT.

coupling).

Then

push

the

single

sweep

control

to

RE-

SET

and

a

single

sweep

will

occur.

To

trigger

a

single

sweep

proceed

as

follows:

1.

Set

the

single

sweep

control

to

SINGLE

SWEEP.

2.

Remove

the

trigger

signal.

This

can

be

done

in

several

ways,

such

as:

a.

Turn

the

Normal

Sweep

LEVEL

control

either

clock-

wise

or

counterclockwise.

b.

Set

the

normal

trigger

SOURCE

control

to

EXT.

c.

Remove

the

input

signal.

3.

Push

the

single

sweep

control

to

RESET

and

release.

The

READY

light

should

turn

on.

4.

Apply

a

trigger

signal

and

the

crt

will

show

a

single

sweep.

Trigger

Selection

The

choice

of

triggering

to

use

depends

on

the

type

and

portion

of

the

signal

to

be

displayed.

For

example,

if

the

display

starts

on

the

leading

edge

of

the

signal

and

it

is

desired

to

start

on

the

trailing

edge,

set

the

SLOPE

control

to

the

other

position.

The

AUTO

position

of

the

COUPLING

is

useful

from

ap-

proximately

15

cps

to

10

mc.

It

has

the

advantage

of

show-

ing

a

trace

when

the

signal

is

removed,

or

when

the

ampli-

fier

input

is

grounded.

This

makes

it

easy

to

check

a

refer-

ence

graticule

line,

since

the

trigger

controls

need

not

be

touched.

The

AC

position

of

the

COUPLING

control

is

the

same

as

for

AUTO

except

for

the

free-run

of

the

display.

Both

the

AUTO

and

AC

positions

reject

any

de

component

in

trigger-

ing

the

signal.

Adjusting

the

POSITION

control

on

the

verti-

cal

amplifier

plug-in

does

not

affect

triggering

in

the

AUTO

or

AC

coupling

positions.

In

the

DC

position

of

the

COUPLING

control,

the

sweep

will

trigger

in

the

range

from

dc

to

10

me.

This

position

should

be

used

with

signals

that

change

slowly,

such

as

a

slow-rising

sawtooth.

The

normal

sweep

LEVEL

control

is

used

to

trigger

the

sweep

at

any

voltage

point

on

these

slow-rising

signals.

With

the

LEVEL

control

centered

the

sweep

will

start

as

the

signal

voltage

crosses

the

zero

volt-

age

point.

For

most

applications

the

trigger

SOURCE

control

should

be

used

in

the

INT.

position.

However,

if

the

frequency

of

the

signal

is

related

to

the

line

frequency

(60

cps},

use

the

LINE

position

of

this

control.

External

triggering

should

be

used

when

signals

are

to

be

sampled

from

several

points

within

a

device,

such

as

in

point

to

point

troubleshooting.

With

external

triggering,

the

trigger

controls

do

not

have

to

be

adjusted

for

each

point

check.

Delayed

Triggering

This

type

of

triggering

has

the

advantage

of

practically

eliminating

jitter

in

the

display

during

delayed-sweep

opera-

tion.

Each

sweep

is

triggered

by

the

expanded

portion

of

the

waveform

and

not

by

the

waveform

at

the

beginning

of

the

normal

sweep.

For

example,

assume

a

pulse

train

®