Tektronix 519 Manuel utilisateur

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2

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TYPE

519

|

Cathode-Ray

Oscilloscope

|

|

OPERATING INSTRUCTIONS

TEKTRONIX,

INC.

PO

Box

500

Beaverton,

Oregon

.

Specifications

Section

1

General

information

The

Tektronix

Type

519

Oscilloscope

is

a

wide-band

laboratory

type

instrument

designed

expressly

for

the

observation

and

measurement

of

high-frequency

phenomena.

Fast

linear

sweeps,

high

crt

accelerating

potential,

high

sensitivity,

wide-band

trigger

system,

and

extreme

bandwidth

permit

single-shot

photo-

graphic

recording

of

fractional

nanosecond

signals.

An

internal

delay

line

in

the

vertical

channel

of

the

instrument

eliminates

the

need

for

adjusting

cable

lengths.

Since

the

length

of

the

delay

line

remains

constant,

the

band-

width

of

the

Type

519

also

remains

constant.

The

Type

519

incorporates

an

adjustable

repetition

rate

fast-rise

pulse

generator

and

a

fast-rise

calibration-step

generator

which

can

supply

waveforms

to

check

the

calibration

of

the

oscilloscope

itself

or

drive

external

devices.

These

generators

meet

most

require-

ments

to

complete

a

test

setup.

|

VERTICAL-DEFLECTION

SYSTEM

Vertical

Deflection

Factor--With

Type

T519A

CRT,

nominally

10

volts

per

cm.

,

Passband--With

Type

T519A

CRT,

dc

to

l

gigacycle*

(3db

down).

.

Risetime--With

Type

519A

CRT,

less

than

0.35

nanosecond.

Input

Impedance--125

ohms.

Maximum

Allowable

Input

Power

to

Vertical

Channel--1.8

watts

(+or-

15

volts

dcor

rms).

Maximum

Allowable

Peak

Signal

Amplitude--

+or-

100

volts.

Internal

Signal

Delay--45

nanoseconds,

fixed.

Voltage

Standing

Wave

Ratio--Nominally

1,2:1

from

dc

to

1

gigacycle.”*

*Gigacycle

=

10”

cps.

T

|

Specifications

-

Type

519

TRIGGER

Triggering

Signal

Sources--Internal

from

+or-

applied

signals,

internal

from

the

Rate

Gen-

erator,

internal

from

the

Calibration-Step

Generator,

and

External.

External

Triggering

Signal

Requirements--

Pulse

amplitude:

20

millivolts.

Pulse

dura-

tion:

1

nanosecond

or

ionger.

Maximum

permissible

external

triggering

signal:

+or-

10

volts

peak.

Internal

Triggering

Signal

Requirements

-

-Pulse

amplitude:

sufficient

signal

to

‘produce

a

2

trace-width

deflection

on

the

screen.

Dura-

tion:

1

nanosecond

or

longer.

Repetition

rate:

O.to

1

gigacycle.

Countdown--Triggering

circuits

count

down

from

triggering

signal

frequencies

higher

than

400

kc.

Sine-wave

trigger

requirements:

0.1

mc

to

1000

mc

(1

gc),

20

mv

peak-to-peak

~

external

trigger

input

or

150

mv

peak-to-

peak

signal

to

vertical

input.

Pulse

Amplitude

or

Sync--Single

control

adjusts

pulse

triggering

level

or

high-frequency

sync.

An

additional

control

provides

vernier

sync.

Delay--0

to

35

nanoseconds

sweep-start

delay.

Permits

sweep

to

display

a

selected

time

interval.

TIME

BASE.

Sweep

Rates--Nine

ranges:

2,

5,

10,

20,

50,

100,

200,

500,

and

1000

nanoseconds

(1

microsecond)

per

centimeter,

Accuracy--Typically

within

2%

of

indicated

rate

on

all

ranges

except

the

2

nanosecond

range which

is

within

3%.

These

tolerances

apply

to

all

ranges

except

for the

first

2

nanoseconds

or

2

mm

(whichever

is

larger)

portion

of

any

of

the

above

rates.

Single

-

Sweep--Normal

or

single

sweeps

selected

by

front

panel

switch

and

reset

by

push-button.

Page

l

+

Trigger

Output--1-volt

into

50

ohms

upon

triggering.

Delayed

+Gate--l-volt

pulse

into

50

ohms

at

start

of

sweep;

hence,

time-dependent

upon

setting

of

sweep-delay

control.

RATE

GENERATOR

Risetime--Less

than

0.8

nanosecond.

Pulse

Repetition

Rate--3

pps

to

30

kc,

con-

tinuously

variable.

Pulse

Duration--10

nanoseconds.

Output

Impedance--50

ohms.

Amplitude--Approximately

+15

volts.

CALIBRATION-STEP

GENERATOR

Risetime~-approximately

0.1

nanosecond.

Step

Repetition

Rate--

Adjustable

250

to

1000

cps,

normally

operated

at

reed-switch

resonant

frequency

near

750

cps.

Output

Impedance--125

ohms.

Amplitude--Into

125

ohms,

0

to

10

volts.

Into

50

ohms

through

T125/T50

adapter,

O

to

1

volt.

Voltages

applied

to

both

impedances

are

continuously

variable

and

calibrated.

Uncalibrated

voltages

up

to

50

volts

into

1252.

Polarity--The

output

polarity

can

be

selecte"

by

a

front-panel

switch.

CATH

ODE-RAY

TUBE

Type--Tol9A

Phosphors--Type

P11

phosphor

standard

(rec-

ommended

for

single

-

shot

photographic

recording

of

fastest

sweep

rate),

Other

phosphors

available

on

special

request.

Usable

Viewing

Area--Two

centimeters,

ver-

tical,

six

centimeters

horizontal.

Accelerating

Voltage--24

kv.

Spot

Diameter--0.004

inch

at

normal

intensity.

Page

2

Deflection--Electrostatic.

Traveling-wave

ver-

tical

deflection

system

with

conventional

hori-

zontal

deflection

plates.

CONSTRUCTION

AND

POWER

REQUIREMENTS

Construction

--

single

-

unit

construction

with

light-weight

aluminum-alloy

chassis

and

four-_

piece

vinyl-finish

cabinet.

Side

panels,

top

and

bottom

panels

are

separately

removable.

Ventilation--Filtered

forced

air

with

protective

thermal

cut-out

insures

safe

operating

temp-

eratures.

Dimensions

--

Approximately

22-1/4"

high,

14-3/4"

wide,

and

25-1/4"

long.

Net

Weight--Approximately

99

pounds.

-

Power

Requirements--105

to

125

or

210

to

250

volts,

50

to

60

cycles,

650

watts.

ACCESSORIES

1

--

1252

Termination

(017

-007)

1

--

1252

Adapter

T50/T125

(017-008)

2--1252

Insertion

Units

(017-013)

1

--

1252

Adapter

N50/N125

(017-015)

1

--

1252

Adapter

T50/N125

(017-017)

1

--

1252

Coupling

Capacitor

(017-018)

1

--

1252

1KMC

Ringing

Crt

(017-019)

1

--

1252

1

nsec

Delay

Cable

(017-507)

1

--

1252

2

nsec

Delay

Cable

(017-508)

©

1

--

1252

5nsecDelay

Cable

(017-509)

1

--

1252

10nsec

Delay Cable

(017-510)

1

--

Set

of

spare

miscellaneous

cable

connector

parts

consisting

of:

Double

Button

Assy.

(017-032)

Panel

Adapter

Assy.

(017-033)

1252

Cable

Connector

(017

-035)

Specifications

-

Type

519

T

2

Spare

Reed

Switches

(260-362)

1

--

3-conductor

Power

Cord

(161-010)

1

--

Viewing

Hood

(includes

attached:

bezel)

1

--

Power

Cord

Adapter

(013-013)

1

--

Accessory

Box

Introduction

1

--

Instruction

Manual

Operating

Information

Section

2

important

to

have

an

understanding

of

the

operation

of

each

control

and

its

function,

The

Type

519

Oscilloscope

is

a

high

sweep

This

section

of

the

Operator's

Manual

is

intended

rate

laboratory

instrument

designed

for

observ-

to

provide

this

understanding

and

other

basic

ing,

measuring,

and

photographically

recording

information.

A

brief

description

of

each

of

phenomena

in

the

nanosecond

(millimicrosecond)

the

front-panel

controls

follows.

Front-panel

region,

However,

before

the

instrument

can

lettering

is

shown

in

Fig.

2-1.

be

successfully

applied

in

actual

use,

it

is

SCALE

ILLUM.

ASTIGMATISM

INTENSITY

FOCUS

Graticule

Control

NANOSEC/CM

DELAY

NORMAL-SINGLE

SWEEP

CYCLES/SEC

‘MULTIPLIER

FUNCTION

OF

CONTROLS

CRT

Adjusts

the

brightness

of

the

graticule

markings.

Used

in

conjunction

with

the

FOCUS

control

to

obtain

a

round

spot

and

a

sharply

focused

trace.

Adjusts

the

brightness

of

the

trace.

‘Used

in

conjunction

with

the

ASTIGMATISM

control

to

focus

the

oscilloscope

display.

A

knurled

knob

located

below

the

center

of

the

graticule

permits

graticule

to

be

moved

down when

not

used.

TIME

BASE

Selects

the

time-base

rates.

Sets

the

delay

time

duration.

Delays

start

of

sweep

with

respect

to

trigger

signal

input.-

Selects

either

normal

or

single-sweep

operation.

RATE

GENERATOR

Selects

the

significant

figures

for

the

RATE

GENERATOR

output

frequency.

Multiplier

for the

CYCLES/SEC

control.

Should

be

set

to

OFF

position

|

when

Rate

Generator

is

not

being

used.

Operating

Information

-

Type

519

Page

3

RANGE

VARIABLE

VOLTS

POLARITY

REED

SWITCH

DRIVE

FREQUENCY

PULSE

AMPLITUDE

OR

SYNC*

VERNIER

SYNC

FUNCTION*

G

AIN*

TRIGGER

SOURCE

CALIBRATION-STEP

GENERATOR

Selects

either

of

two

full-scale

amplitudes

of

the

calibrator

step,

a

variable

pulse

amplitude,

or

a

standby

condition.

Should

be

set

to

STANDBY

position

when

Calibration-Step

Generator

is

not

being

used,

Permits

the

step

waveform

to

be

preset

to

an

arbitrary

desired

amplitude

up

to

about

50

volts.

Sets

the

output

voltage

amplitude

of

the

calibration-step

waveform.

Selects

either

positive-

or

negative-going

output

step

waveform.

Adjusts

reed-switch

magnetic

excitation

or

permits

single

closure.

Controls

frequency

of

the

reed-switch

magnetic

excitation

to

reduce

multiple

contact

bounces.

TRIGGER

Rejects

triggers

below

selected

amplitude

or

adjusts

synchronization.

Used

in

conjunction

with

PULSE

AMPLITUDE

or

SYNC

control

to

synchronize

the

sweep.

Permits

choices

of

triggered

or

synchronized

displays,

depending

upon

nature

of

input

signals.

Selects

proper

gain

for

the

triggering

signal.

Selects

the

triggering

signal

source

and

polarity.

*Also

see

TRIGGER

OPERATION

section

of

front-panel,

Fig.

2-1.

VERTICAL

AXIS

ROTATION

HORIZONTAL

DIM

ADJ.

ON

©

Page

4

POSITIONING

Adjusts

the

vertical position

of

the

trace.

Aligns

the

trace

parallel

to

the

horizontal

centerline.

Adjusts

the

horizontal

position

of

the

trace.

POWER

Used

to

adjust

brightness

of

adjacent

pilot

light

after

45

seconds

warm-up.

Main

power

switch.

Operating

Information

-

Type

519

T

PRELIMINARY

INSTRUCTIONS

Cooling

A

blower

maintains

safe

operating

temp-

erature

in

the

Type

519

Oscilloscope

by

drawing

air

through

a

filter

and

circulating

it

over

the

components.

Therefore,

the

instrument

must

be

placed

so

that

the

air

intake

and

cabinet

ventilating

holes

are

not

blocked.

The

air

filter

must

be

kept

clean

to

permit

adequate

air

flow.

A

thermal

cutout

switch

will

disconnect

the

dc

power

if

air

flow

is

restricted

or

ambient

temperature

is

too

high.

DC

power

will

return

when

the

temperature

drops

to

a

safe

value.

The

pilot

lamp

will

increase

to

full

brightness

in

event

of

loss

of

dc

power.

The

blower

continues

to

cool

the

interior

and

reduces

the

time

the

thermal

switch

remains

open.

Power

Requirements

_

The

regulated

power

supplies

in

the

Type

-

519

Oscilloscope

will

operate

with

line

vol-

tages

from

105

to

125

volts

(117

nominal)

or

from

210

to

250

volts

(234

nominal),

The

line

voltage

for

which

your

instrument

is

wired

at

the

factory

is

indicated

on

a

metal

tag

fastened

to

the

rear

panel

near

the

power

receptacle,

Power

wiring

may

be

changed

for

either

117-

or

234-volt

operation

in

com-

pliance

with

the

information

given

in

Fig.

2-2.

The

power

transformer

is

wound

with

two

117-volt

primaries

which

can

be

connected

in

parallel

for

117-volt

operation

or

in

series

for

234-volt

operation.

Since

the

blower

motor

is

connected

across

only

one

of

the

trans-

former

primaries,

no

change

in

the

motor

lead

connections

is

required.

When

power

wiring

is

changed,

the

voltage

indicated

on

the

metal

tag

should

be

covered

with

another

tag

which

conforms

to

the

new

operating

voltage.

For

maximum

dependability

and

long

life,

the

line

voltage

applied

to

the

Type

519

Oscillo-

scope

should

be

near

the

design

center

(117

7

or

234

volts).

If

the

line

voltage

exceeds

the

operating

limits

or

has

a

poor

waveform.

(distorted

sine-wave

peaks),

unstable

power

supply

operation

may

result.

Observe

for

proper

line

voltage

and

waveform

before

checking

for

other

causes

of

unstable

operation.

T

Operating

Information

-

Type

519

Fuse

Requirements

.

When

the

Type

519

Oscilloscope

is

con-

nected

for

117-volt

operation,

use

a

7-amp

slow-blowing

type

fuse.

When

the

instrument

is

connected

for

234-volt

operation,

use

a

4-amp

slow-blowing

type

fuse.

Time

Delay

A

time

delay

relay

used

in

the

Type

519

delays.

operation

of

the

instrument

for

approx-

imately

45

seconds

after

the

power

switch

is

operated.

The

relay

allows

a

brief

tube-

warmup

period before

the

dc

operating

voltages

are

applied.

When

the

ac-power

pilot

light

dims,

the

instrument

is

ready

for

use.

If

the

ac

power

is

interrupted

for

only

an

instant,

the

normal

45-second

delay

will

occur

before

the

instrument

returns

to

full

operation.

Dim

Adjustment

The

DIM

ADJ.

control

is

a

screwdriver

adjustment

which

controls

the

brightness

of

the

ac-power

pilot

light

after

the

45-second

delay

period.

The

control

may

be

adjusted

to

any

desired

setting.

Normally,

it

is

adjusted

to

a

setting

which

will

reduce

glare

from

the pilot

light

when

waveform

observations

are

being

made

in

a

darkened

room.

FIRST-TIME

OPERATION

To

place

the

Type

519

in

operation

for

the

first

time,

the

following

procedure

is

suggested:

1.

Set

the

front-panel

controls

as

follows:

POWER

Off

DIM

ADJ.

Centered

FOCUS

Centered

INTENSITY

Fully

counterclockwise

ASTIGMATISM

Centered

SCALE

ILLUM.

Centered

DELAY

Min.

NANOSEC/CM

rs)

Page

5

MULTIPLIER

X1000

CYCLES/SEC

10

CALIBRATION-

Standby

STEP

GENERATOR

controls

TRIGGER

SOURCE

RATE

GEN,

GAIN

,

NORMAL

FUNCTION

PULSE

VERNIER

SYNC

centered

PULSE

AMPLI-

TUDE

or

SYNC

Fully

counterclockwise

VERTICAL

Centered

HORIZONTAL

Fully

clockwise

2.

Connect

the

power

cord

to

the

rear

of

.

the

instrument

and

to

the

source

of

power.

The

line

voltage

for

which

the

instrument

is

wired

at

the

factory

is

indicated

near

the

power

cord

receptacle.

3.

Set

the

POWER

switch

to

ON.

4,

Allow

about

.45

seconds

for

the

pilot

lamp

to

suddenly

dim

,

indicating

that

dc-operating

voltages

are

applied

and

the

instrument

is

ready

for

use.

5.

Advance

the

INTENSITY

control

until

a

visible

spot

appears

near

the

left

center

of

the

screen.

CAUTION

Do

not

turn

the

intensity

so

high

that

a

bright

glow

surrounds

the

spot.

Excessive

undeflected

bright-

ness

may

damage

the

screen

in

a

few

seconds.

6.

Adjust

the

FOCUS

and

ASTIGMATISM

con-

trols

in

conjunction

with

each

other

to

produce

a

small

round

spot.

7.

Advance

the

PULSE

AMPLITUDE

or

SYNC

control

fully

clockwise

to

obtain

a

hori-

zontal

sweep

trace

across

the

screen.

Readjust

the

INTENSITY

control

for

suitable

trace

brightness.

Page

6

8.

Rotate

the

HORIZONTAL

positioning

control

to

position

the

start

of

the

trace

at

the

left

side

of

the

graticule.

9,

Adjust

the

AXIS

ROTATION

control

until

the

trace

is

parallel

to

the

horizontal

centerline

of

the

graticule.

10.

Connect

a

T50/N125

adapter

to

the

+RATE

902

connector

so

that

the

50-ohm

fittings

match,

ll.

Connect

a

2-nsec

125-ohm

cable

from

the

125-ohm

end

of

the

adapter

to

the

SIGNAL

125Q

connector.

12.

Rotate

the

PULSE

AMPLITUDE

or

SYNC

control

slowly

counterclockwise

until

a

stable

display

of

the

Rate

Generator

pulse

is

obtained.

Center

the

waveform

vertically

using

the

VERTICAL

positioning

control.

13.

Adjust

the

FOCUS,

INTENSITY,

and

ASTIG-

MATISM

controls

until

a

sharp

trace

with

adequate

intensity

is

obtained.

These

con-

trols

are

slightly

interdependent

and

will

require

readjustment

to

obtain

the

best

trace.

An

external

signal

and/or

trigger

may

now

be

applied

to

the

input

connectors,

If

external

triggers

are

used,

set

the

TRIGGER

SOURCE

switch

to+

or

-

EXT.

CRT

CONTROLS

AND

GRATICULE

Intensity

The

INTENSITY

control

is

used

to

adjust

the

brightness

of

the

oscilloscope

display.

Thus,

compensation

can

be

made

for

changes

in

brightness

resulting

from

changes

in

the

triggering

rate

or

time-base

rate.

The

INTEN-

SITY

control

is

rotated

clockwise

to

increase

brightness

and

counterclockwise

to

decrease

brightness.

Care

must

be

taken

when

using

the

INTENSITY

control

that

the

brightness

is

not

turned

up

to

the

point

where

the

phosphor

on

the

face

of

the

cathode-ray

tube

(crt)

becomes

permanently

damaged.

The

intensity

of

the

beam

should

never

be

turned

up

to

the

point

where

a

bright

halo

forms

around

a

stationary

spot.

Operating

Information

-

Type

519

T

Focus

and

Astigmatism

The

FOCUS

and

ASTIGMATISM

controls

operate

collectively

to

permit

a

sharp,

clearly

defined

spot

or

trace

to

be

obtained.

The

proper

setting

of

the

ASTIGMATISM

control

is

obtained

by

rotating

the

FOCUS

control

fully

clockwise,

setting

the

PULSE

AMPLITUDE

or

SYNC

control

fully

counterclockwise,

and

setting

the

INTENSITY

control

high

enough

so

the

spot

is

visible

(it

may

be

necessary

to

adjust

the

POSITIONING

controls),

Then

adjust

the

ASTIGMATISM

control

to

obtain

the

most

circular

spot

possible.

The

FOCUS

control

is

then

adjusted

to

reduce

the

spot

diameter

as

much

as

possible.

This

method

of

spot

adjustment

is

made

with

no

input

signal

applied

©

to

the

SIGNAL

125

input

connector.

Also,

the

ambient

light

in

the

room

should

be

kept

low

or

the

viewing

hood

should

be

used

so

the

spot

can

be

observed

at

a

low

intensity

level.

Another

method

for

adjusting

the

spot

size

—

would

be

to

couple

a

10-volt

step

waveform

from

either

the

RATE

GENERATOR

or.

the

CALIBRATION-STEP

GENERATOR

to

the

SIG-

|

NAL

12592

connector.

When

the

step

waveform

is

displayed

on

the

screen,

the

FOCUS

control

is

adjusted

to

narrow

the

trace

during

the

rising

portion

of

the

waveform.

The

ASTIG-

MATISM

control,

is

used

to

narrow

the

trace

along

the

horizontal

portion

of

the

same

wave-

form.

Since

the

two

controls

interact,

repeat

the

procedure

to

obtain

a

sharply-defined

trace

in

both

the

vertical

and

horizontal

direction.

Graticule

The

disappearing

graticule

used

withthe

Type

519

Oscilloscope

is

accurately

marked

with

6

horizontal

and

2

vertical

1-centimeter

divisions.

The

markings

on

the

horizontal

centerline

are

9

millimeters

apart;

those

on

the

vertical

centerline

are

2

millimeters

apart.

The

graticule

markings

allow

time

and

voltage

measurements

to

be

made

from

the

oscillo-

scope

screen.

To

make

the

graticule

disappear

for

a

clear

view

of

the

screen,

loosen

the

knurled

knob

located

just

below

the

graticule

and

slide

it

downward

the

full

length

of

the

slot.

Tighten

the

knob.

To

make

the

graticule

reappear,

reverse

the

process.

T

Operating

Information

-

Type

519

The

graticule

cover

and

mask

assembly

is

held

securely

in

place

by

four

slotted

graticule

nuts

and

is

provided

with

hinge

fittings

for

mounting

the

viewing

hood.

In

addition,

the

hinge

fittings

allow

quick

removal

of

the

viewing

hood

so

that

a

Tektronix

Model

C12

or

Model

C19

camera

may

be

mounted.

The

Model

C19

camera

is

especially

designed

to

photograph

the

fast

sweeps

of

the

Type

519

Oscilloscope,

When

the

camera

is

not

being

used,

it

can

be

unlatched

and

swung

away

from

the

crt

screen.

Graticule

IIlumination

The

graticule

is

illuminated

by

two

lamps

located

at

the

top

edge

of

the

graticule.

The

SCALE

ILLUM,.

control,

located

below

the

oscilloscope

screen,

is

rotated

clockwise

to

increase

the

illumination

of

the

graticule

mark-

ings

and

counterclockwise

to

decrease

the

illumination.

Camera

Jack

A

camera

jack,

marked

6.3V

CAMERA,

pro-

vides

a

6.3-volt

source

for

use

with

the

Type

C19

camera.

When

the

camera

plug

is

inserted

in

the

jack,

the

SCALE

ILLUM

control

and

oscilloscope

graticule

lights

are

automatically

disconnected.

The

6.3-volt

source

is

utilized

by

the

camera

to

project

a

virtual

image

graticule

on

the

face

of

the

crt.

During

pro-

jection

of

the

image

graticule,

the

oscilloscope

graticule

should

be

dropped

out

of

view.

POSITIONING

Two

controls,

VERTICAL

and

HORIZONTAL,

are

used

to

allow

the

trace

to

be

positioned

to

the

desired

point

on

the

oscilloscope

screen.

A

third

positioning

control,

AXIS

ROTATION,

is

used

to

align

the

trace

with

the

horizontal

centerline

of

the

graticule.

The

VERTICAL

position

control

has

suf-

ficient

range

to

allow

the

trace

to

be

positioned

completely

off

the

top or

bottom

of

the

screen

or

to

any

intermediate

point.

The

trace

moves

up

when

the

control

is

rotated

clockwise

and

down

when

the

control

is

rotated

counter-

clockwise.

The

HORIZONTAL

position

control

causes

.

the

trace

to

move

to

the

right

when

it

is

rotated

in

the

clockwise

direction

and

to

the

Page7

left

when

it

is

rotated

counterclockwise.

The

total

horizontal

positioning

range

of

the

control

_is

about

2

centimeters.

The

AXIS

ROTATION

control

is

a

screw-

driver

adjustment

located

between

the

VER-

TICAL

and

HORIZONTAL

controls.

This

adjust-

ment

permits

the

trace

to

be

rotated

about

an

axis

through

the

center

of

the

screen.

The

control

is

adjusted

to

align

the

trace

parallel

to

the

horizontal

centerline.

VERTICAL-DEFLECTION

SYSTEM

Input

Signal

Connection

The

electrical

signal

to

be

observed

is

applied

externally

through

a

125-ohm

coaxial

cable

to

the

SIGNAL

1252

connector.

The

Signal

passes

internally

first

through

atrigger-

energy

takeoff,

then

through

a

45-nsec

delay

cable

to

the

distributed

vertical

deflection

plates

of

the

crt.

The

signal

causes

the

spot

to

be

deflected

vertically.

The

spot

traces

out

the

signal

waveform

on

the

screen

as

the

spot

is

deflected

horizontally

by

the

horizontal

sweep

circuits.

The

vertical

size

of

the

displayed

waveform

is

adjusted

to

a

suitable

amplitude

by

inserting

external

attenuators

or

an

amplifier

in

series

with

the

signal-carrying

cable.

Or,

if

the

CALIBRATION-STEP

GENERATOR

is

being

used

as

the

signal

source,

the

vertical

amplitude

of

the

waveform

can

be

adjusted

by

means

of

the

CALIBRATION-STEP

GEN-

ERATOR

front-pane!

controls.

The

vertical

sensitivity

of

the

Type

519

Oscilloscope

is

the

same

as

the

sensitivity

of

the

crt

mounted.in

the

instrument.

Each

crt for

the

Type

519

is

measured

for

sensitivity

and

risetime

at

the

factory.

These

measure-

ments

are

then

clearly

recorded

on

the

crt

face

mask.

The

sensitivity

measurement

can

be

checked

at

any

time

by

using

the

CALI-

BRATION-STEP

GENERATOR.

To

check

the

measurement,

connect

a

125-

ohm

cable

from

the

OUTPUT

125Q

connector

to

the

SIGNAL

125

connector.

Set

the

(CALI-

BRATION-STEP

GENERATOR)

RANGE

switch

to

10V

TO

125Q

and

rotate

the

VOLTS

control

to

10.00.

Adjust

the

oscilloscope

front-panel

controls

for

a

stable

presentation

of

the

step

waveform.

Rotate

the

VOLTS

control

counter-

clockwise

until

that

portion

of

the

waveform

located

2

nsec

after

the

rise

is

exactly

one

Page

8

centimeter

high.

The

exact

vertical

sensitivity

in

volts

per

centimeter

can

now

be

readdirectly

from

the

VOLTS

dial.

For

example,

if

the

VOLTS

dial

shows

a

.

reading

of

8.70,

the

vertical

deflection

factor

is

8.7

volts

per

centimeter.

When

connecting

the

oscilloscope

to

any

signal

source,

the

connections

should

be

made

directly

through

125-ohm

cables

or

through

suitable

impedance

matching

devices

to

the

SIGNAL

125Q

connector.

If

the

signal

amplitude

is

too

great,

it

will

be

necessary

to

attenuate

the

signal

to

a

usable

level

before

applying

it

to

the

SIGNAL

125

connector.

This

can

be

done

by

inserting

a

125Q

attenuator

(or

known

attenuation

factor)

between

the

signal

source

and

the

SIGNAL

125Q

connector.

Attenuators

may

be

used

individually

or

may

be

"

stacked"

(connected

in

series).

If

the

signal

amplitude

is

too

low

to

produce

sufficient

vertical

deflection,

an

external

ampli-

fier

can

be

inserted

between

the

signal

source

and

the

SIGNAL

1252

connector.

However,

if

the

amplifier

does

not

provide

the

correct

‘input

and

output

impedance,

or

has

limited

bandwidth,

signal

waveform

errors

may

result.

In

addition,

if

the

amplifier

stages

do

not

operate

linearly

the

signal

will

not

be

repro-

duced

faithfully

on

the

crt.

In

general,

to

obtain

an

accurate

waveform

display

and

to

prevent

unwanted

reflection

of

high-frequency

waveforms

or

of

fast-rise

pulses,

all

cables

should

be

terminated

in

their

characteristic

impedances.

Delaying

the

Signal

+

The

Type

519

Oscilloscope

contains

a

fixed

signal-delay

line

which

permits

the

sweep

to

be

well

under

way

before

displaying

the

leading

edge

of

an

input

signal.

By

means

of

the

fixed

signal-delay

line,

the

input

signal

is

purposely

delayed

45

nanoseconds

before

arriving

at

the

vertical

deflection

plates.’

This

amount

of

delay

allows

sufficient

time

for

the

trigger

circuits

to

process

the

trigger

signal

and

start

the

sweep.

The

DELAY

control

delays

the

start

of

the

sweep

from

O

to

35

nanoseconds.

Within

this

range

of

time,

the

DELAY

control

can

be

used

to

select

the

display

time

and

thus

apparently

position

the

waveform

horizontally

on

the

screen.

Operating

Information

-

Type

519

T