Tektronix TYPE L User manual

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1

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INSTRUCTION

MANUAL

Tektronix,

Inc.

S.W.

Millikan

Way

•

P.

O.

Box

500

•

Beaverton,

Oregon

•

Phone

Ml

4-0161

•

Cable :

Tektronix

Tektronix

International

A.G.

Terra enweg

1A

•

Zug,

Switzerland

•

PH.

042-49192

•

Cable:

Tekintag,

Zug

Switzerland

•

Telex

53.574

070-336

All

Tektronix

in trument

a

re

warranted

again t

defective

material

and

workman



hip

for

one

year.

Tektronix

tran former ,

manufactured

in

our

own

plant,

are

war



ranted

for

the

life

of

the

in trument.

Any

que tion

with

re pect

to

the

war



ranty

mentioned

above

hould

be

taken

up

with

your

Tektronix

Field

Engineer.

Tektronix

repair

and

replacement-part

ervice

i

geared

directly

to

the

field,

there



fore

all

reque t

for

repair

and

replace



ment

part

hould

be

directed

to

the

Tek



tronix

Field

Office

or

Repre entative

in

your

area.

Thi

procedure

will

a ure

you

the

fa te t

po ible

ervice.

Plea e

include

the

in trument

Type

and

Serial

number

with

all

reque t

for

part

or

ervice.

Specification

and

price

change

priv



ilege

re erved.

Copyright

©

1962

by

Tektronix,

Inc.,

Beaverton,

Oregon.

Printed

in

the

United

State

of

America.

All

right

re erved.

Content

of

thi

publication

may

not

be

re



produced

in

any

form

without

permi ion

of

the

copyright

owner.

http://manoman.sqhill.com

WARRANTY

AA

Type

L

http://manoman.sqhill.com

CONTENTS

Warranty

Section

1

Characteri tic

Section

2

Operating

In truction

Section

3

Circuit

De cription

Section

4

Maintenance

Section

5

Calibration

Procedure

Section

6

Part

Li t

and

Schematic

http://manoman.sqhill.com

01X1

1

CHARACTERISTICS

General

Information

The

Type

L

Plug-In

is

a

fast-rise,

high

gain,

calibrated

preamplifier

designed

for

use

with

the

Tektronix

530-,

5 0-,

550-

and

*580-

Series

oscilloscopes.

The

unit

contains

a

fast



rise

d

c

amplifier

similar

to

the

Type

K

Plug



*Type

81

Plug-In

adaptor

must

be

used

with

the

580-Series

Oscilloscopes.

**Nanoseconds

are

10~9

seconds.

In

Unit,

plus

a

fast-rise

high-gain

ac

amplifier

which

may

be

used

to

increase

the

sensitivity

by

a

factor

of

10.

This

instrument

was

adjusted

at

the

factory

for

best

transient

response.

The

L

Unit

alone

has

a

risetime

of

6

nanoseconds

in

AC

or

TABLE

1-1.

TRANSIENT

RESPONSE

AND

BANDPASS

Type

RISETIME

in

nanoseconds

**

BANDPASS

L

AC-DC

Unit

switch

AC

or

DC

X10

GAIN

AC

DC

AC

X10

GAIN

AC

Oscilloscope

Type:

70

70

DC

to

5MC

3

cps

to

5MC

3

cps

to

5MC

532

5 1/5 1A

5 3/5 3A

5 5/5 5A

555

12

1

DC

to

30MC

3

cps

to

30MC

3cps

to

2 MC

531/531A

533/533A

535/535A

23

32

DC

to

15MC

3cps

to

15MC

3cps

to

11MC

*581

*585

12

1

DC

to

30MC

3

cps

to

30

MC

3cps

to

2 MC

551

1

16

DC

to

25MC

3cps

to

25MC

3cps

to

22MC

536

32

35

DC

to

11MC

3cps

to

11MC

3cps

to

10MC

With

X10

probes

(Types

P6017,

P6000,

P510,

P 10)

minimum

AC

response

is

reduced

to

0.3

cps.

AA

Characteristics

-

Type

L

Plug-In

1-1

DC

and

10

nanoseconds

in

X10

GAIN

AC.

Table

1-1

summarizes

risetimes

and

frequency

responses

available

when

the

L

Unit

is

used

in

combination

with

various

types

of

Tektronix

oscilloscopes.

Vertical

Deflection

Factors

AC

or

DC

position

of

AC-DC

switch:

0.05

to

20

volts

per

centimeter

in

nine

calibrated

steps;

also

continuously

variable

(uncalibrated)

between

steps,

and

up

to

50

volts

per

centimeter.

X10

GAIN

AC

position

of

AC-DC

switch:

0.005

to

2

volts

per

centimeter

in

nine

calibrated

steps;

also

continuously

variable

(uncalibrated)

between

steps,

and

up

to

5

volts

per

centimeter.

Step

Attenuator

(VOLTS/CM

switch)

Accurac

Within

3%

of

front-panel

reading

for

all

positions

of

VOLTS/CM

switch.

Input

Impedance

Characteristics

Type

L

Plug-In

Unit:

1

Megohm

shunted

by

20

picofarads.

Type

P6017

Probe:

10

Megohms

shunted

by

1

picofarads.

Type

P6000

Probe:

10

Megohms

shunted

by

11.5

picofarads.

Type

P510

Probe:

10

Megohms

shunted

by

1

picofarads.

Type

P 10

Probe:

10

Megohms

shunted

by

8

picofarads.

Maximum

Allowable

Combined

DC

and

Peak

AC

Input

600

volts,

ac-coupled.

Mechanical

Construction:

Aluminum-alloy

chassis.

Finish:

Photoetched,

anodized

front

panel.

Weight:

Approximately

5

pounds.

1-2

Characteristics

-

Type

L

Plug-In

AA

01X1

2

OPERATING

INSTRUCTIONS

Markings

and

Functions

of

Controls

The

functions

of

the

controls

should

be

understood

before

operating

the

L

Unit.

This

section

of

the

Instruction

Manual

is

intended

to

aid

in

initially

putting

the

instrument

into

operation

and

to

serve

as

a

brief

reference

guide.

Figure

2-1

shows

the

front-panel

con



trols,

connectors

and

adjustments

of

the

Type

L

Plug-In

Unit

and

describes

their

functions.

In

this

Manual,

control

and

adjustment

mark



ings

are

given

as

printed

on

the

instruments,

with

fully

capitalized

words

used

for

front



panel

markings,

and

first-letters

capitalized

for

names

of

internal

adjustments.

Examples:

VERTICAL

POSITION

control;

H.F.

Peaking

control.

On

the

front

panel

of

the

L

Unit

,

red

markings

are

related

to

the

red

VARIABLE

knob,

blue

and

black

markings

are

related

to

the

black

knobs.

The

black-numbered

scale

around

the

VOLTS/CM

switch

is

used

when

the

AC-DC

switch

is

in

AC

or

DC

position,

and

the

blue

scale

is

used

when

the

AC-DC

switch

is

in

X10

GAIN

AC

position.

In

the

following

procedures,

oscilloscope

controls

are

called

by

the

names

usually

applied

to

them

on

the

scopes

with

which

the

Type

L

Unit

can

be

used.

Alternate

names

for

the

controls

are

given

in

parentheses.

First-Time

Operation

To

set

the

oscllloscope/Type

L

Plug-In

Unit

combination

in

operation

for

the

first

time

the

following

procedure

is

suggested:

1.

Insert

the

Type

L

Unit

into

the

plug-in

compartment

of

the

oscilloscope

and

tighten

it

with

the

securing

rod.

2.

Set

the

front-panel

controls

as

follows

(con



trols

not

mentioned

may

be

in

any

position):

Oscilloscope:

POWER

off

INTENSITY

fully

counter



clockwise

HORIZONTAL

DISPLAY

NORMAL

("

A"

,

INTERNAL

SWEEP)

MAGNIFIER

(5X

MAG.)

OFF

Main

Sweep

Controls:

TIME/CM

.5

MILLISEC

VARIABLE,

TIME/CM

CALIBRATED,

fully

clockwise

TRIGGER

SLOPE

-INT.

(-)

TRIGGERING

MODE

AC

(AC

SLOW)

(TRIGGERING

SOURCE)

(INT.)

STABILITY

fully

clockwise

TRIGGERING

LEVEL

fully

clockwise

Type

L

Plug-In

Unit:

AC-DC

DC

VOLTS/CM

.05

(black

numbers)

VARIABLE,

VOLTS/CM

CALIBRATED,

fully

clockwise

3.

Connect

the

power

cord

to

the

instrument

and

to

the

source

of

power.

.

Turn

ON

the

POWER

switch.

Allow

a

minute

for

the

filaments

to

heat

and

the

time-delay

relay

to

operate.

5.

Before

increasing

the

intensity,

center

the

trace

vertically

with

the

VERTICAL

POSITION

control,

using

the

Beam

Indicator

neons

of

the

oscilloscope

as

a

guide.

(When

both

vertical

AA

Operating

Instructions

-

Type

L

Plug-In

2-1

VOLTS/CM

—

Nine

-

po ition

witch

elect

calibrated

vertical

en itivitie

indicated

on

panel.

Black

number

u ed

for

AC

and

DC;

blue

number

for

x10

GAIN

AC.

VARIABLE

--

Control

provide

continuou ly

variable

attenuation

be



tween

tep

of

VOLTS/

CM

witch.

Extend

attenuation

to

provide

en itivity

to

50

V

/cm

i

n

AC

and

DC;

to

5

.

0v/cm

in

x

10

G

AIN

AC.

AG-DC--Thr

e

e

-

po ition

witch

provide

d

c



coupling

in

DC

po ition.

ac-

co

upling

in

x10

GAIN

AC

and

AG

po ition .

x10

GAIN

AC

po ition

al o

witche

x10

amplifier

into

circuit.

Ground--Connector

for

grounding

other

equip



ment

t

o

cha i

of

plug

in

unit.

INPUT

UHF

-

type

ignal

input

connector.

TYPE

L

PLUG-IN

UNIT

SERIAL

VARIABLE

VOLTS/CM

ATTEN.

GAIN

ADJUST

Screw



driver-

adju table

con



trol

eta

gain

of

main-

amplifier

ection

of

the

unit.

GAIN

ADJUSL--

Screwdriver

adju t



able

control

et

gain

of

X10

amplifier

ec



tion.

VERTICAL

POSITION

-

-

Control

o cillo cope

vertically.

po ition

di play

2-2

VERTICAL

foiinoiv

VARIABLE

BAL,

Screwdriver

ad

ju

table

control

bal



ance

main-amplifier

ection

o

that

u e

of

VARIABLE

control

doe

not

hill

o cillo cope

di play.

VARIABLE

ATTEN.

BAL,

-

Screwdriver

adju table

control

bal



ance

X

10

amplifier

out

put

o

that

u e

of

VARIABLE

control

doe

not

hift

o cillo cope

d

i

-

play.

Fig.

2'1.

Functtorts

of

front-panel

controls

and

connectors

of

the

Type

L

Plug

Jn

Unit.

Operating

Instructions

Ivpc

L

Plug-In

A.A

http://manoman.sqhill.com

Beam

Indicator

neons

are

unlit,

the

trace

is

approximately

centered.

6.

Rotate

the

INTENSITY

control

clockwise

until

the

free-running

trace

appears

on

the

crt.

Center

the

trace

with

the

vertical

and

horizontal

positioning

controls.

7.

Adjust

the

FOCUS,

ASTIGMATISM

and

INTENSITY

controls

to

obtain

a

sharp

trace

with

adequate

intensity.

8.

Let

the

instrument

warm

up

for

at

least

15

minutes

before

making

any

adjustment

changes

or

accurate

observations.

Variable

Attenuator

Balance

Adjustment

The

need

for

adjustment

of

the

VARIABLE

ATTEN.

BAL.

control

is

indicated

by

a

vertical

shift

in

the

position

of

the

trace

as

the

VARIABLE

(VOLTS/CM)

control

is

rotated.

The

Type

L

Unit

has

a

separate

VARIABLE

ATTEN.

BAL.

control

for

each

of

the

two

amplifiers

in

the

unit.

The

main

amplifier

section

VARIABLE

ATTEN.

BAL.

control

adjusts

the

de

balance

between

the

two

outputs

of

the

amplifier.

The

X10

VARIABLE

ATTEN.

BAL.

control

adjusts

the

d

c

level

of

the

X10

amplifier

output

to

match

that

of

the

First

Cathode

Follower,

so

that

the

trace

position

will

not

shift

when

changing

from

X10

GAIN

AC

to

either

of

the

other

positions

of

the

AC-DC

switch.

Check

these

adjustments

in

the

following

order:

1.

Set

the

front

panel

controls

as

previously

listed.

With

no

signal

applied

to

the

INPUT

of

the

plug-in

unit,

freerun

the

trace

with

the

STABILITY

and

TRIGGERING

LEVEL

con



trols

fully

clockwise.

Set

the

AC-DC

switch

at

AC.

Turn

the

VARIABLE

control

back

and

forth,

watching

the

CRT

for

a

shift

in

position

of

the

trace.

If

the

trace

moves

when

the

control

is

rotated,

adjust

the

upper

VARIABLE

ATTEN.

BAL.

control

until

the

trace

position

is

no

longer

affected

by

the

VARIABLE

control.

2.

Turn

the

AC-DC

switch

to

X10

GAIN

AC.

Check

the

d

c

balance

of

the

X10

amplifier

by

rotating

the

VARIABLE

control

back

and

forth.

If

the

trace

moves,

adjust

the

X10

VARIABLE

ATTEN.

BAL.

control

until

rotation

of

the

VARIABLE

control

no

longer

affects

the

position

of

the

trace.

Return

the

VARIABLE

control

to

the

CALIBRATED

position,

fully

clockwise.

Checking

Gain

Adjustment

Adjustment

of

the

vertical

gain

should

be

checked

frequently.

Aging

of

tubes

and

other

components

causes

a

slight

change

in

the

gain

characteristics

of

the

plug-in.

In

order

to

make

correct

voltage

measurements,

adjust



ment

of

the

gain

must

be

correct.

The

Type

L

Unit

has

two

screwdriver

adjust



ments

on

the

front

panel

for

setting

gain--one

for

each

amplifier

in

the

unit.

Checking

the

gain

is

done

in

two

steps:

1.

With

the

oscilloscope

and

L

Unit

controls

positioned

as

above,

set

the

oscilloscope

CALI



BRATOR

output

for

.2

VOLTS.

Be

sure

the

VARIABLE

(VOLTS/CM)

is

in

CALIBRATED

position.

Connect

a

lead

from

the

output

con



nector

of

the

CALIBRATOR

to

the

INPUT

connector

of

the

Type

L

Unit.

Adjust

the

STABILITY

and

TRIGGERING

LEVEL

controls

of

the

oscilloscope

for

a

stable

display

of

the

CALIBRATOR

square

wave.

The

peak-to-

peak

vertical

deflection

should

be

exactly

four

major

graticule

divisions

( cm).

If

incorrect,

adjust

the

upper

GAIN

ADJUST

control

with

a

small

screwdriver

to

obtain

the

proper

amplitude.

2.

With

all

other

controls

positioned

as

in

the

previous

step,

turn

the

CALIBRATOR

to

20

MILLIVOLTS

and

set

the

AC-DC

switch

in

the

X10

GAIN

AC

position.

Adjust

the

STABILITY

and

TRIGGERING

LEVEL

controls

to

obtain

a

stable

square-wave

display.

Check

the

waveform

for

exactly

major

graticule

divisions

( cm)

of

vertical

deflection.

If

the

amplitude

is

not

correct,

adjust

the

X10

GAIN

ADJUST

control

until

exactly

cm

peak-to-

peak

is

observed.

Remove

the

lead

from

the

L

Unit

INPUT.

INPUT

Coupling

For

measurement

of

de

voltage

levels

or

signal

-to-ground

voltages,

it

is

necessary

to

have

dc-coupling

throughout

the

measuring

instrument.

With

the

AC-DC

switch

in

DC

position,

the

oscilloscope/Type

L

Unit

com



bination

is

dc-coupled

throughout.

AA

Operating

Instructions

-

Type

L

Plug-In

2-3

However,

it

is

often

neither

necessary

nor

desirable

to

display

the

de

component

of

the

input

waveform.

A

capacitor

which

is

in

series

with

the

INPUT

connector

blocks

the

de

com



ponent

when

the

AC-DC

switch

is

in

either

the

AC

or

the

X10

GAIN

AC

position.

This

permits

viewing

of

the

ac

part

of

a

large

input

signal,

as

well

as

detailed

viewing

of

the

ac

part

of

any

signal

having

adc

component.

Connecting

to

the

Signal

Source

Stray

electric

and

magnetic

fields

picked

up

by

unshielded

connecting

cables

often

change

the

appearance

of

displayed

waveforms.

This

type

of

distortion

occurs

even

in

the

audio



frequency

range,

except

possibly

when

making

measurements

of

low-impedance

circuits.

In

general,

unshielded

leads

of

appreciable

length

are

not

suitable

for

connecting

the

input

signal

to

the

plug-in

INPUT.

Shields

of

leads

used

should

be

grounded

to

the

chassis

of

the

instru



ment

in

use.

Coaxial

cables

are

recommended

for

most

purposes.

In

broadband

applications,

it

is

usually

neces



sary

to

terminate

a

coaxial

cable

with

a

resistor

which

presents

a

resistance

equal

to

the

charac



teristic

impedance

of

the

cable.

This

prevents

the

production

of

high-frequency

damped

oscil



lation.

As

the

length

of

the

cable

is

increased

it

becomes

more

important

to

properly

ter



minate

the

cable.

The

termination

is

placed

at

the

oscilloscope

end

of

the

cable,

although

many

sources

require

an

additional

termination

at

the

source

end

as

well.

For

large

amplitude

signals

an

attenuator

may

be

included

in

the

connective

system

to

provide

an

oscilloscope

display

having

a

more

desirable

amplitude

than

would

be

possible

with

no

attenuation.

Cables,

attenuators

and

ter



minating

resistors

are

listed

in

the

Accessories

section

of

any

Tektron

i

x

oscilloscope

Instruction

Manual.

When

checking

the

instruments,

actual

operat



ing

conditions

should

be

simulated

as

nearly

as

possible.

For

example,

the

oscilloscope

should

work

into

a

load

impedance

similar

to

that

which

it

encounters

in

actual

use.

The

input

circuit

of

the

plug-in

may

some



times

produce

loading

of

the

signal

source.

At

the

INPUT

connector

of

the

Type

L,

the

impedance

of

the

input

circuit

is

equivalent

to

a

resistance

of

1

Megohm

shunted

with

a

capacitance

of

20

picofarads.

With

a

few

feet

of

shielded

cable,

the

capacitance

may

well

be

increased

to

100

picofarads.

Where

the

effects

of

these

resistive

and

capacitive

loads

is

significant,

a

probe

may

be

used

to

introduce

the

input

signal.

Use

of

Probes

An

attenuator

probe

reduces

both

capacitive

and

resistive

loading

of

the

signal

source

and

decreases

apparent

sensitivity

of

the

oscil



loscope.

Attenuation

by

the

probe

permits

observation

and

measurement

of

signal

voltages

in

excess

of

those

that

can

be

accepted

by

the

preamplifier

alone.

The

10X

probes

(P6017,

P6000,

P510A,

P 10)

supplied

with

the

oscilloscopes

accepting

letter



series

plug-ins

may

all

be

used

with

theL

Unit.

Input

characteristics

of

these

probes

are

listed

in

the

Characteristics

section

of

this

Manual.

Maximum

voltage

which

may

be

applied

to

the

probes

is

600

volts

dc-plus-peak-ac.

Exceeding

this

limit

may

result

in

damage

to

the

components

inside

the

probe.

The

P510A

Probe

can

be

used

only

from

DC

to

50MC,

due

to

the

tendency

for

the

probe

to

ring

at

50MC

and

above.

If

the

displayed

waveform

contains

high-

frequency

portions,

it

is

generally

necessary

to

clip

the

probe

ground

lead

to

the

chassis

of

the

equipment

being

checked.

Before

using

a

probe,

check

its

adjustment.

An

adjustable

capacitor

in

the

body

of

the

probe

is

used

to

compensate

for

differences

between

input

capacitances

of

various

instruments.

To

insure

the

accuracy

of

pulse

and

waveform

measurements,

the

probe

adjustment

should

be

checked

when

changing

oscilloscopes,

and

occasionally

when

used

with

any

scope.

Probe

Compensation

To

adjust

the

compensation

of

the

probe

to

the

instrument

combination

with

which

it

is

to

be

used,

the

following

procedure

is

suggested:

1.

Set

the

oscilloscope

and

plug-in

controls

as

listed

above

in

First-Time

Operation.

Turn

the

oscilloscope

CALIBRATOR

voltage

selector

to

2

VOLTS.

Allow

adequate

time

for

the

instru-

2-

Operating

Instructions

-

Type

L

Plug-In

AA