Heathkit IT -3120 User Manual

Heathkit IT -3120

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Page

19

TEST

AND

ADJUSTMENT

Figure 1 shows

the

front

panel

of

the

Transistor Tester.

Study

the

figure carefully

to

identify

the

function

of

each

switch, control, jack,

and

socket.

If

any

trouble

is

encountered

in

the

following steps, refer

to

the

"In

Case

of

Difficulty"

section

on

Page 29.

( )

Be

sure

the

ON

-

OFF

switch

is

in

the

OFF

(out)

position.

( )

The

meter

needle

should

be

on

the

extreme

left mark

on

the

scale as

shown

in Figure

1_

If

the

pointer

is

not

over

this

mark,

slowly

turn

the

Mechanical Zero screw,

while

you

lightly

tap

the

meter

face with

your

finger

to

properly

position

the

pointer.

BATTERY TEST

( ) Press

the

following

front

panel

pushbutton

switches:

10mA

BETA =

00

BAT. TEST

( )

Be

sure

the

PNP-NPN switch

is

in

the

NPN

(out)

position.

( ) Press

the

ON-OFF switch

to

the

ON

(in) position.

The

meter

pointer

should be

within

the

BAT OK area on

the

meter. A new

battery

will cause

the

pointer

to

deflect off scale

on

the

right side

of

the

meter. This

is

normal.

( ) Press

the

PNP-NPN switch

to

the

PNP (in) position.

The

meter

pointer

should

be

within

the

BAT

OK

area

on

the

meter

. A new

battery

will cause

the

pointer

to

deflect

off

scale

on

the

right side

of

the

meter.

( ) Release

the

ON-OFF switch

to

the

OFF

(out)

position.

ADJUSTMENT

( )

Connect

the

test

leads

to

the

appropriate

front

panel

jacks.

( )

Connect

the

166.n,

1%,

preciSion

resistor

(brown-

blue-blue-black)

between

the

collector

(black)

test

lead

and

the

emitter

(red)

test

lead.

( ) Press

the

following

front

panel

pushbutton

switches:

TRANS

Iceo

10mA

Press

the

PNP-NPN switch

to

the

PNP (in) position.

Press

the

ON-OFF switch

to

the

ON

(in) position.

( ) Adjust

the

control

on

the

circuit

board

to

position

the

meter

pointer

at

the

85

mark on

the

leakage scale.

( ) Release

the

PNP-NPN switch

to

the

NPN

(out)

position.

The

meter

reading should

not

change.

If

the

reading

is

different,

note

the

position

of

the

pointer.

(If

the

meter

indication

is

greater

than

90,

or

less

than

80,

replace

the

batteries

.)

Then

readjust

the

control

on

the

circu it board

to

place

the

pointer

half way

between

the

noted

point

and

the

85

mark.

( ) Remove

the

resistor from

the

test leads.

Tape

this

resistor

to

the

inside

of

the

front

panel

for

future

use.

Release

the

ON-OFF switch

to

the

OFF

(out)

position.

( ) Press

the

following

front

panel

pushbutton

switches:

FET

GM

= 0

100l1A

( ) Press

the

P CHAN-N CHAN switch

to

the

P CHAN (in)

position.

Press

the

ON-OFF switch

to

the

ON

(in) position.

Rotate

the

SET

Gm = 0

control.

If

the

meter

pointer

can be

positioned

above

and

below

the

0 mark (full

scale)

on

the

Gm

scale,

the

F ET

circuitry

is

operating

properly

.

( )

Release

the

P CHAN-N CHAN switch

to

the

IN

CHAN

(out) position and

repeat

the

previous step.

( ) Release

the

ON

-

OFF

switch

to

the

OFF

(out)

position.

This

completes

the

"Test

and

Adjustment"

of

your

Transistor Tester. Proceed

to

"Final

Assembly."

Table of Contents

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Heathkit IT -3120 Specifications

General

Brand	Heathkit
Model	IT -3120
Category	Test Equipment
Language	English

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