Heathkit IT-3120 User guide

Heathkit@ Manual

for the

FET/TRANSISTOR

TESTER

Model IT -3120

595-1989-04

• • -

'':It

TABLE OF CONTENTS

Introduction ...... . . ......................... . ...

..

Parts List . . . Assembly Notes Step-by-Step Assembly

Subpanel Assembly and Wiring . . Front Panel Assembly and Wiring Subpanel Installation Final Wiring

Test and Adjustment

Final Assembly .........

HEATH

BENTON

.......

COMPANY

HARBOR,

. . . ... .

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.....

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..

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......

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... . ..... . ..

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..

...

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..

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.....

MICHIGAN

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........

...

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..

. .

..... . .. . ..

......

. . .

.. ..

. . .

...... . ..

. . . .

.. . ....

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..

... . ....

....

. .

..

.....

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.......

49022

....

2

Operation

2

In

Case

....

.4

...

..

5

Specifications .. . ..........

. .

..

.8 Circuit Description

.

.19

. . 20

Chassis Photograph

13

15 Circuit Board X-Ray Views

17 Schematic

Warranty Customer Service

......

of

Difficulty . . ......

Troubleshooting

...

(Fold-out from page) .

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.. ...

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.....

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...

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...

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..

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......... . .. . ...

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..

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.. ..............

. .

... . ..........

Printed

..

in

. .

.....

20 29

.......

..

...

. . . . .

©

30

.

31

32

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38

. .

39 41

.

1976

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Inside Front Cover

..

Inside Rear Cover

Copyright

Heath Company

the United States of America

Page

2

INTRODUCTION

The Heathkit Model IT -3120 FET /Transistor Tester instrument for quick, accurate tests of conventional (bipolar) transistors, diodes, FET's, SCR's, triacs. and unijunction transistors. Gain (DC Beta), transconductance (Gm), and leakage values are read directly meter.

You

can

quickly out-of-circu it. The Tester provides special balance coded

FET sockets

Five current

microampere and collector currents

out

leads

and easily test devices either in-circuit

in-circuit impedances.

for

in-circuit tests

for

out-of-circuit tests.

ranges

permit

on

the large easy-to-read

Use

or

the

built-in

leakage measurements

as

high

is

a quality

circuitry

either the

transistor and

as

low

as

1 ampere.

PARTS

Check

each correspond from

Page

Any

part

on

it

should

identified

KEY

HEATH

No. Part No.

part against

to

the numbers on the

5) .

that

is

packaged in

be

until

that

PARTS DESCRIPTION Per

the

following

an

placed back in its envelope after

part

is

called

Kit

list. The key numbers

Parts

Pictorial

envelope

for

with a part

in a step.

(fold-out

or to

color

as

1

number

it

is

type

Pushbutton

easy,

consistent operation.

A special battery testing

of

the

condition Another convenience two-color

conventional (bipolar) transistors and

FET's. Also, separate, brief operating instructions printed on the rear panel.

Refer

to

the

wiring,

soldering,

range, mode, and

of

front

panel design, black lettering

"Kit

Builders

resistors, and

circuit

the

of

this portable instrument

Guide" for

function

provides a meter indication

self-contained power supply .

capacitors.

switches

red

lettering

information

assure

is

the

on tools,

LIST

To

order a replacement part, furnished "Replacement Parts" inside the rear cover For pricing information, refer to separate "Heath Parts Price List."

KEY

No. Part No.

with

HEATH

this

kit. If

PARTS Per

Kit

CAPACITORS-DIODE-CONTROLS

use

the Parts Order Form

one

is

not

DESCRIPTION

available,

of

the Manual.

for for are

see

RESISTORS

1/2-Watt

A1

1-129

A1

H05

6-1509

A1

1/4-Watt,

A2 6-1

A2

660-12

6-3600-12

6-1501-

Other

A3 2-11-2

A4 3-13-3

1%

Precision

12

3

4.7 violet-gold)

10

black-orange) 15

green-black-gold)

n,

10% (yellow-

kn,

5%

(brown-

n. 1% (brown

81 82 83 84 85

'

21-57 57-65 10-934

10-926 14-

11

2

.005

J-lF

disc capacitor

1 N4002 silicon diode

750 n control

kn

control

15 250

kn/5000

control

n (5

k)

HARDWARE

#2

166 n

2

(brown-blueblue-black) 360 n (orange-blue black-black) 1500 n (brown-greenblack-brown)

n,

2-watt, precision

1.5

n.

3-watt,

.15

Hardware

C1 C2

C3

#4

Hardware

C4

C5

C6

250-1'75 252-51 254-7

250-52 252-2 254-9

10 10

10

2-56 x

3/8"

screw

2-

56

nut

#2

lockwasher

1/4"

8 8 8

4-40 x

4-40

#4

lockwasher

screw

nut

I§

~

fUitSf§hi9

Page

3

KEY

No.

-----

#6

Hardware

C7

C8

#10

C9

HEATH Part No.

250-155

255-49

Hardware

250-83

PARTS DESCR IPTION Per

Kit

---

6

3

2

#6 x 3/8" metal screw #6

# 1 0

self-tapping screw

sheet

spacer

x 1/2" hex head

Control Hardware

C10 C11 C12

252-7 253-10 254-4

2 2 2

Control nut Control flat washer Control lockwasher

SOCKETS - JACKS - PLUGS

01

434-342 434-343

02

436-11

03 '03 436-22 Black banana jack

436-24

03 03

436-29

D4 438-47

05

260-53

2 9

1 4 4

Transistor socket Socket pin Red banana jack

White banana jack Green banana jack Banana plug Alligator clip

FEET-KNOBS-INSULATORS

E1

261-49

E2

462-362

E3

70-10 Black banana plug

E3

70-11

E3

70-12

E3

70-13

E4

73-34

8

2

4

Rubber

Knob

insulator Red insulator Green banana plug insulator

White banana plug

insulator

Rubber insulator

foot

banana plug

KEY

HEATH

No. Part No.

~-

-

--

Wire

(cent'd.l

344-70 344-71

344-72 344-73 344-74 344-75 344-77 344-78

PARTS DESCRIPTION Per

Kit

White-black White-brown

White-red White-orange White-yellow White-green White-violet White-gray

MISCELLANEOUS

85-1167-1

F1

203-1412-2 F2 90-561-3 F3

204-1837

F4

207-82

F5 211-15

F6 214-76 F7

407-173

F8

455-50 2

F9

64-97 F10 64-98 F11

64-99 F12 490-5

597-260

597-308

391-34

The

following

use

in

the

completed

2 O-cell flashlight batteries (alkaline

longer

life).

5

2

1

batteries should

Kit:

Circuit board Front panel Cabinet shell Subpanel Clamp Handle Battery holder Meter

Knob bushing Mode switch Range switch Function switch Nut starter Parts Order Form Kit Builders Guide Blue and white label Manual (See front cover for part number.)

Solder

be

purchased

type

at

this time

preferred

for

WIRE

341-1 341-2 341-5 341·6

344-50

344-51 Brown 344·52 344-54 344-55 Greer. 344-59

Black stranded Red

stranded White stranded Green stranded Bla.::k

Red

Yellow

White

Page

4

=

= :

1.

Before have read the " Kit

2. Resistors n,

or

kn,

directed otherwise.

starting

Builders

will

to

the

wiring and

Guide."

be

called

and color code.

ASSEMBLY

assemble

out

this

kit. be

soldering

by their respective value in

Use

1/2-watt resistors unless

sure

information

you

in

NOTES

3.

Capacitors (in

11F)

SAFETY excess the

leads.

leads

WARNING:

so

and

We

the

ends

will

be

called

type (disc).

Avoid

suggest

that

will

you wear

not

fly

out

by their capacitance value

eye

injury

when you clip

glasses,

toward

your

or

at least clip

eyes.

off

1"

I I

2"

3"

I

4"

I

5"

I

6"

I

~

~fh*iifHfj]

Page

5

STEP-BY-STEP

START

Position

the

complete each

NOTE: When wiring this kit, you will be instructed of time,

wire,

remove

The wires are listed they will be used . wire until you are specifically instructed to

do so

( ) Prepare

As

steps, turn

the lead

circu it board as shown. Then

step

on

the

to

prepare lengths of wire ahead

as

in

the

cut

1/4"

in

white wire;

1/4"

2·

1"

5"

you install each wire

wire

to

the

indicated length

of insulation from each end.

in

the

Do

a step.

the

following lengths of

the

circuit board over, solder

to

the

foil, and

Pictorial.

step. To prepare a

order

not

use

in

the following

cut

off

in

~

5·1/2"

4"

3·1/4"

the

and

which

excess

ASSEMBLY

CONTINUE

NOTE

DIODES MAY

I

NAN

Y 0 F

THE

POS

ALWAYS AS

SHOWN

Il

, v '

750 n control.

10

360

blu

4.7 n (Yellow-violet-gold).

.15

1.5

Solder the leads off

15

( )

green-black-gold)

166

ITION

ON

lrlll

BANDED

1 N4002 silicon diode

kn

(brown-black-orange).

n.

1%

e-black-black)

n, 3-watt

n,

2-watt precision.

the

excess lead lengths.

n.

1%

n.

F 0 L

THE

CIRCUIT

precision

precision.

precision

LOW

THE

END

.

to

.

BE

the

SUPPLIED

IN

G S HAP E S.

BANDED

BOARD.

(#57-65).

(o

range

foil and

(brown-

END

·

cut

I'

1"

white wire.

5"

white wire.

5·1/2"

white

4"

white wire.

3·1/4"

white wire.

rOR

GOOD

CONNECTIONS , YOU

K(EP

~~:

DAMP

SOLDER

THE

SOLDERING

TII~

c~~~:~.

SPONGE

OR

wire.

MUST

WITH

A -. _ _~ I

CLOTH

.

4tl

..

~"

PICTORIAL

1

over

the

outlines

on

4.7 n (yellow·violet·gold).

1500

n. 1%

green-black-brown)

4.7 n (yellow·violet-gold).

the

Solder off

the excess lead lengths.

the

precision

leads

circuit board.

(brown-

.

to

the

foil and

cut

_pa_g_e_6

______________________________________________________________________

Refer

to

Pictorial 2

yellow

the the

.

the

The

the

red brown

white

following circuit

following

other

such

number

are

at

( ) Prepare

6" 8-1/2" 8-1/2" 7-1/2"

NOTES:

1.

In to later

2. In cause number, tion. wires

for

the

following

steps,

board. The

steps,

wires

will

as

(S-3),

following

the

connection.

~~~fifi6Sfff{¥~

steps.

lengths

connect

2-1/2"

7" 7" 8-1/2"

other

(NS)

be

added

means

of

hookup

white green black

red

only

end

means

to

the

"S"

one

will

not

later.

solder

tells

wire :

end

be

connected

to

solder

"S-"

the

how

of a wire

be-

with a

connec-

many

PICTORIAL

2

Connect a

Connect

Connect a 7

Connect a

Connect

Cut the

an

off

the excess lead lengths

circuit

6"

yellow

8-1/2"

-1/2"

2-1/2"

7"

green

7"

black wire

8-1/2"

board.

wire

red wire

brown

white

wire

red

wire

to

hole E (S

to

hole

wire

to

wire

to

hole

wire

to

hole

to

hole C (S-1).

to

hole 0 (S-1).

to

hole

-1).

F (S-1).

hole A (S-1).

B (S-ll.

G (S-1).

M (S-1).

from

the foil side

of

34% % 0

I , I I I 1 I

1"

I

2"

I

3"

I

4"

I

5"

I

6"

,

///1

~

..

fU=.MiifH£§l

_____________________________________

• • • • • • • • • •

• • • • • • • • •

• • • • • • • •

• • • •

• • • • •

..

,'

w...

~

..-..

: ,-,-, .

./

-..

'.~

..

.

_ .

JIll...

~,

f18c.

..

"

,'.

-'

""'

....

..

~

J""\

.

..

."

.:

....

'..

~

g

P_a_

e_7

Refer

to

Pictorial 3 for

In

the

NOTE:

switches as follows:

1. Align

2. Press

3.

4.

following steps, install

board.

circuit board holes.

turn

the

each

end

Re-examine

seated against

Make sure

side

of

the

switch.

r..: : ::

YerQ~~:--_?8--

the

following steps.

the

switch over

Then

insert

the

switch against circuit board over and solder of

the

switch

the

switch

the

jumper wires on

the

circuit board

:

::

the

mode

the

holes

the

switch lugs into

the

circuit board;

to

the

foil.

to

make sure it

circuit board.

do

not

~

and

on

the

touch

cB

oaa

PICTORIAL 3

fu

nction

the

circuit

the

then

one

lug

at

is

still

component

the

lugs

of

~

. .

~~

Then

5. surrounded

the

Install

at

AA. NOTE: To make sure you use

switch,

on

Install

board

Carefully all excess lead lengths.

NOTE:. You should have a it

aside; it will

compare

Pictorial 3.

the

at

AB.

examine

leads

are

be

0

solder

with foil)

mode

switch

it

function switch

the

soldered

used later.

to

166

the

(#64-97)

the

circuit

to

remaining lugs (those to

the

circuit board foil.

on

the

circuit board

the

correct

one

shown

at

(#64-99)

board foil

the

foil.

on

Then

location

the

to

cut

AA

circuit

make sure

off any

n precision resistor left. Set

Page

8

:::

o

PICTORIAL 4

SUBPANEL ASSEMBLY AND WIRING

Refer

to

Pictorial 4

NOTE: The plastic clamps you will install in the next two steps are quite brittle. Place them in warm water make them more flexjble before you install them.

( ) Refer

subpanel at AC. Support the back then

use

hole. Position the clamp

( ) Likewise, install the clamps

NOTES:

1. The term screws, nuts, and lockwashers when parts are being

for

the

following

to

the inset drawing and install a clamp

a screwdriver

"hardware"

to

press

as

shown in

at

will

steps.

AD, AE,

be

used

for

a few minutes to

of

the clamp

the

to

on

the

the subpanel;

into

the

Pictorial.

AF,

and AG .

refer

to

the

of

the

mounted in some

"Use 2-56 x

use

a 2-56 x and a 2-56 nut. Refer step

for

correct way

2.

Use

the plastic

hold

and start 2-56 and 6-32 nuts on screws.

( )

Mount Use

2-56 x

( ) Install the range switch

shown. NOTE:

cutout

the the switch and insert one end at a time cutout.

3/8"

screw, one

the

correct

to

install the hardware.

nut

the assembled

3/8"

hardware

Use

2-56 x

The push

buttons

in the subpanel. Therefore, you must

following

hardware,"

or

to

the Pictorial called

number

starter suppl ied

circuit

3/8"

of

board on the subpanel.

at

AH,

(#64-98)

hardware at

of

this switch are larger than

steps. The phrase

for

example, means

more

#2

lockwashers,

out

lockwashers and the

with

this

kit

AJ,

AK,

and

AL.

on the subpanel

AN

and AP.

into

to

in a

to

as

tilt the

_p_ag_e__1_0

Refer

to

Prepare the

7" 2" 6-1/

_____________________________________________________________________

Pictorial 6

white-orange white

2"

for

the

following

white-yellow

following

lengths

2"

white 2-1 /2" 4"

white

steps.

of

white

wire:

( )

Connect a 4" to

lug

( ) Prepare

1-1/4"

1/4"white

1-

9"

white-black

9"

wh

10

of

switch F (S-1).

the

following

white

ite-green

wh

ite

wire

lengths

9"

10"

7-1 /4"

~

from

white

red

fifPhSiifi¥£iU

lug 5

of

switch D (S-

of

wire:

-red

black

1)

Connect a B

(S

switch G (S-1).

( ) Connect a

through clamp

( ) Connect a 6-1/

switch B (S-1), through clamps switch G (S-1).

( ) Connect a

through

Connect a 2-1/ (S-1)

-1).

through

clamp

through

7"

white-orange

2"

white

AD.

2"

white wire

AD,

2"

cla

mp

wire

clamps

white

AC

wire

from

to

lug 4

of

white-yellow

from

to

lug 6

of

wire

AD

to

l

ug 7 of

from

lug 15

and AD.

lug 2

switch G (S-1).

wire

AC

lug 3

switch G (S-

from

to

of

switch F (S-1)

from

and

AD,

to

of

switch F (S-1) ,

1)

lug 8

of

switch G (S-1).

of

switch

lug 14

lug 6

lug 5

.

switch F

of

.

of

only one end later .

( )

Connect (NS)

( )

Connect (S-2)

NOTE

: In each

Connect sw itch E (S-1). through

to

lug 3

a 1-

lug 3

of

one end

clamps

a 1-1/

4"

of

switch

1/4"

of

switch P (S

of

the

following

a w ire. The

AE

white

of

a 9"

Insert

and

wire

N (NS).

wire

-1).

fiv

other

white

the

AF.

from

lug 3

from

lug 3

e steps,

end

will

-black wire

other

end

of

switch M

of

switch

you

will

connect

be connected

to

lug 5

of

this

N

of

wire

3,4

% % 0

~1~,~I~,~t~,~~----L---~I~--~--~I----~--~1

1"

2"

3"

____

L-

___

4"

!L-

I

5"

__~__~!____~___

6"

,

~ >fif=f§fiif{~

_______________________________________________________________________

pa

_g_e_9_

( )

Temporarily

su

the control

( )

Temporarily T.

Use a control

to

Refer following

( ) Position the free ends

NOTE: cut of

the insulation.

( ) Prepare the

Pictorial 5 (fold-out

steps.

circuit

When bare

the

white

1"

bare 3/ 1-1/2" 3/4"

bare

3/4"

bare

install a

bpanel at

nut.

install a 15

board

out

wire

to

following

white

S.

lockwasher and a

of

the way

is

the

250

kD/5000

Use a control

kD

control

from

of

the wires

as

shown.

called

for

in the

indicated

lengths

1" 1-1/4"

1-1/4"white

4"

bare

length;

of

bare

white

hookup

D (5

k)

control

lockwasher and a

on the subpanel

control

nut.

this

page)

coming

following then remove all

wire

:

for

from

on

the

steps,

at

( )

( ) Prepare the

NOTE: their 90 degrees)

neat

Connect a 1"

(S-2)

of

switch M to

Connect a 1-1/4" (S-2)

to

lug 6

of

Connect a 1-1/4"

to

lug 6

(S-2)

8"

white-red

9"

brown

6"

white-violet

3"

white

Most

terminating

when

as

possible when

of

following

wire

lengths are longer than needed

points.

you

bare

switch

position

it

is

wire

from

lug 6

of

white

wire

P (NS).

white

wire

R (NS).

lengths

12"

8"

yellow

7"

wh

Therefore,

the wires

completed.

lug 9 (NS)

switch

N (NS).

from

lug 6

from

lug 6 of

of

wire:

white-gray

ite-green

use

square corners (bent

to

make the

through

of

switch

to

lug 4

reach

kit

as

N

P

( )

Connect a 1" (S·l)

of

( ) Connect a

7

(S-l)

of

NOTE: for following

( )

( ) Connect a

NOTE

goes

two one leaving the soldering these connections, to

Use

the

help in

to

wires in the solder

solder

identifying

steps.

Connect a 3/4" to

lug 5

to

lug 5

tolug50fswitch

: Where a

another

these

bare

control

of

S.

1-1/2"

white

con

trol

S.

switch

"through

lug

bare

switch

N (NS).

3/4"

bare

switch P (NS).

3/4"

bare

R

wire

passes

point,

as

connection . Be

the

instructions

wires."

wire

between lugs 3 (NS) and 6

wire

between lugs 5

numbering

pushbutton

wire

(S-l).

through a connection

in

the

to

apply

drawing

switch lugs in the ( )

from

lug 2

of

swi tch M

from

lug 2

of

switch N (S-l)

from

lug 2

of

switch

it

(S-2) one

especially

enough solder and heat

careful,

(S-l)

of

Pictorial 5

P (NS)

and then

will

count

entering

and

(S-l)

as

and

when

( ) Connect an

(S-l),

K

(S-l).

Connect a 9"

(S-l),

of

control

Connect (S-l),

G

(S-l).

Connect a 3" through

( ) Connect one end

switch A

AE,

AC,

Connect

( )

(S-1),

control T (S-l)

Connect

( )

(S-l),

G

(S-l).

8"

through

S (S-2).

a

6"

through

clamp

(S-l).

and

an

through

a

7"

through

white-violet

white

AF.

8"

.

white-green

clamps

white-red

clamps

brown

clamps

wire

AC,

to

lug 2

of a 12"

Insert the

It

will

yellow

clamps

wire

from

AC

and

AD,

wire

from

AC,

AE,

AF,

wire

from

AC

and

AD,

from

lug 5

of

switch D (S-l).

white-gray other

be

connected later .

wire

from

AC,

AE,

wire

from

AC

and

AD,

lug

end

and

lug

to

lug 5

11

and

lug 3

to

lug 2

of

wire through

lug 7

AF,

lug 18

to

lug

10

of

switch

of

switch

of

switch

AG,

to

lug 3

of

switch

of

switch

switch B (S-l),

to

lug 2

of

clamps

of

to

of

11

switch

of

lug 2

switch

A

of

B

1"

I I

2"

3"

I

4"

I

5"

I

6"

I

Page

n lug 9 (NS) through lug 4

,witch

N (NS).

from

lug 6

of

lug 6

switch N

of

switch P

'e

5)

-e

from

5)

;

of

wire :

Nhite·gray ,

II

ow

hite-green

9

SWITCH

LUG

NUMBERING

Q

'ger than needed

~

.

us

e square corners (bent

?

INires

to make the kit

,d.

-e

from

lug

,d

AD.

to

from

lug

AF,

IE,

ire

from

AD,

to

,d

m lug 5

sw

itch D

.f

,hi Ie-gray wire

ther end through clamps

mnected late

from

lug 7

>.E,

and

e

from

lug

dAD,

10

to

lOaf switch

lug 5 of switch

11

of

swi tch B

and AG,

to

lug 3

of swit

lug 2 of switch

of

switch B (5·11,

(5·1

J.

to

lug 2

r.

of

switch A

AF,

to

lug 2

18

of switch

lug

11

of

reach

lug 3

ch B

switch

as

B

Q

of

B

PICTORIAL

5

5"

I I

6"

wH"

-eRN

~

IIhT \

SlK

~

R n\'lhT R[D

'n

n n/ I

Pi

SWITCH

LUG

NUMBERING

Q

Page

10

Refer

to

Pictorial 6

( ) Prepare the

7"

white-orange

2"

white

6-1

/2"

white-yellow

)

(

Connect a

B

(5-1),

switch G (5-11.

)

(

Connect a through clamp

)

(

Connect a swil

ch

B (5-1),

switch G

( )

Connect a through clamp

( )

Connect a (5-1) through clamp

for

followin'

7"

white-

through

2"

white

AD,

6-1/2"

throu

(S-l).

2" while

AD,

2-1/2"

the

cl

I

v

t

11\

PICTORIAL

6

Q

%%~O

I I ! t! t !

Refer

to

Pictorial 8

Prepare a

10"

for

the

length

following

of

black solid wire.

steps.

. / 5

OPEN

IDE

Page

13

Connect one end switch A through clamps

( ) Route the red wire coming

through clamps AC and

( ) Connect the

hole T

(S-l).

( ) Connect the black wire coming

hole D, through clamps AE, switch P (S-2).

( ) Connect the green

hole switch P (S-2).

( ) Connect the

hole B, through clamps

switch N (S·2).

( ) Connect the brown

hole switch M

( ) Connect the red wire coming

F, through clamps

M (S-1).

( ) Connect the

hole G

( ) Refer

each arm

This completes the assembly and it

aside temporarily.

(S-l).

E,

through clamps

C,

through clamps

A,

through clamps

(S-l).

to

lug 3

to

the

clamp.

until

it

locks

of

a

10"

black wire

Insert

the

other end

AC

and

AD.

It

will

from

AD.

It

will

yellow

white

To

wire coming

AE

and

AF,

wire

coming

AE,

AF,

wire coming

AE,

AF,

wire

coming

AE,

AF,

from

AE,

AF,

and

AG,

wire coming

of

switch D

inset drawing on Pictorial 8 and close

do

to

(S-l)

.

this, push inward on

the stationary arm.

wiring

FRONT PANEL ASSEMBLY AND

Refer

to

Pictorial 9

Place a soft

( )

front

panel

( ) Locate the

for

the

following

cloth

on

your

from

becoming scratched.

front

panel and position

work

steps.

surface

to

of

be

connected later.

circuit

board hole M

be

connected later.

from

circuit

to

lug 1

from

circuit

and

AG,

to

from

circuit

and

AG,

to

from

circuit

and

AG,

to

from

circuit

and AG,

from

of

WI

it

circuit

to

lug 6

circuit

the

subpanel. Set

RING

to

as

shown.

to

board hole

protect

lug

11

this wire

board

of

control

board

lug 2

board

lug 5

board

lug 5

board

lug 8

of

switch

board

flexible

the

of

't

. 1

/

0'

1,

'

C~K

3

~~

;

15

~~~

70

~

Detail 9A

( )

2.

Start a socket pin down through socket hole 1. Be sure the open side of the top of the pin faces the center of the socket.

3.

( )

of

( ) 4. On the underside of the socket. grasp the full length

of

( ) 5.

of

( ) 6. Similarly . prepare a 4-pin socket; do

( ) Install a prepared 5-pin transistor socket at BA with 2-56

of

( ) Install the prepared 4-pin socket at BF with 2-56 x 3/8"

( ) Install a black banana jack

( ) Install a

( ) Install a red banana jack

( ) Install a green banana jack at

( )

Push the pin as far as you can into the socket. Then pull it with long-nose pliers until it is fully seated.

of the pin with pliers and twist the pin about 45 degrees to hold it into the socket.

In

the same manner. install four more pins into the

socket.

in

hole

5.

x 3/8" hardware.

hardware. Be sure to position the socket with lug 2 as shown.

at

BB.

with

the

jack. Do

white

with

the

jack. Do

with

the jack. Do

with

the jack. Do

Mount a battery hardware. shown.

Mount hardware. shown.

a battery holder at

not

overtighten

banana jack at BC.

not

overtighten

not

overtighten

not

overtighten the nut.

holder at

Be

sure

to

position the positive (+) end

Be

sure

to

position the positive (+) end

at

BD.

BE. Use

BG

BH

not install a pin

Use

the

nut.

Use

the

nut.

Use

the

nut

the

with

'~

TURN

45°

nut

supplied

nut

supplied

nut

supplied

.

nut

supplied

4·40 x 1/4"

as

4-40 x 1/4"

as

'Refer to Detail 9A for the following six steps.

1.

( )

Position a transistor socket as shown.

( ) Mount the handle at BN with

self-tapping screws.

#10

x 1/2" hex head

Page 14

®

~

fH*iifH£il

o

PICTORIAL

o

10

.l

1"

I

2"

I I

3"

4"

I I

5"

6"

I

:;: :;:

Refer

to

Pictorial 10

( ) Prepare the

~

for

the

following

lengths

of

steps.

wire:

( ) Cut both

leads

Then connect this capacitor

(NS)

to

the

lug

of

jack

a .005

BO

IlF

disc capacitor

from

the lug

(NS).

of

Page

to

jack

15

3/4".

BC

3-1/2"

green

5"

white

5"

white

4"

black

( ) Connect a

(S-1)

tothe

( ) Remove

an of a 5" through lugs 2

3-1/2"

white

green

lug

of

jack

additional

1/4"

wire. Connect this end

(S-2)

and 5 socket BA. Connect the other end BC

(NS) .

( ) Connect a

to

the lug

( ) Connect a

to

the lug

( ) Connect a

to

the lug

Connect a

to

the lug

Connect a

(S-1)

to

5"

of

jack

4"

of

jack

6"

of

jack

4"

of

jack

5-1/2"

the lug

white

wire

BC

(NS).

black wire

BB

(NS).

black wire

BB

(NS).

red wire

BO

(NS).

red wire

of

jack

6"

4"

5-1/2"

wire

BE

from

BO

black red

from

(NS).

of

insulation

(S-2)

lug 1

lug 3

lug 2

from

(NS).

red

lug 4

to to

of

lug 1

of

socket B F

from

one

end

of

the wire

lug 4

(S-1)

the lug

of

jack

socket BF (S-1)

socket

BA

(S-1

socket

BF

(S-1)

socket

BF

(S-1)

of

socket BA

SUBPANEL

Refer

to

following

( )

Mount meter only included

( ) Place a

INSTALLATION

Pictorial

steps.

the

with

a lockwasher and

11

(fold-out

meter on the

front

the positive (+) terminal

nut

at

with

the meter.

from

Page

panel. Position the

as

BJ.

Use

#6 spacer on meter mounting bolts BK, BL,

and BM.

of

( ) Locate the assembled subpanel and remove the control

nuts

from

controls

Sand

T.

( ) Install the assembled subpanel on the inside

front

panel .

)

( ) Install lockwashers and nuts

the hardware included

pushbutton switches do panel.

If

necessary, reposition the

( ) Install

controls

()

Remove and discard the shorting wire from between

control

Sand

flat

T.

at

BK,

BL,

with

the meter.

not

bind against the

su

bpanel.

washers and control nuts on

the meter terminals.

17)

for

the

shown. Install

the hardware

of

the

and BM.

Be

Use

sure

front

Page 16

o

(

/

o

PICTORIAL

12

o

\

)

[[ ~fffWSi*fl5fj)

Page

17

FINAL

Refer

( ) Connect

Connect

WIRING

to

Pictorial 12 (on

Connect positive (+)

Connect the black negative

lug

of

jack

Connect the lug

of

jack

the

Red

wire

Green

White-red

White

-black

the

(-)

the

wires

to

wire

red

wire

terminal

term

i nal

black

BB (S-3) .

white

BC (S-4).

coming

the

lug

to

the

lug

to

lug 1

wire

to

Page

16)

for

coming

of

the

meter

wire

coming

of

the

meter

wire

coming

wire

coming

from

clamp

of

jack BD (S-4).

of

jack BE (S-2).

of

battery

lug 2

of

battery

the

from

(S-l).

from

AF

holder

following

clamp

(S-l).

clamp

as

follows:

BG

holder

steps.

AD

AG

(S-l).

BG

to

the

to

the

to

the

to

the

(S-l).

IAI

REMO

VE

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r-

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White·green

White-gray This

Check Switches C and L should to

the switch lugs.

to

Refer

Pictorial 13

Prepare shown

wire

completes

to

see

the

in Part A

wire

to

lug 1

to

lug 2

the

wiring

that

all

for

the

following

red test lead

of

Pictorial 13 . Then install a banana

of

battery

of

battery

of

your

connections

not

have

steps.

from

holder

BH

Transistor

are soldered.

any

wires connected

red stranded

BH

(S-l).

Tester.

wire

(S-l).

as

~

t

TESTCLIP

INSULATOR

plug

with

clip

and

rubber

lead

as

shown

In a similar manner,

black,

white,

~

__

PICTORIAL

a red

insulator

in

Parts

and green test leads.

~/

~

13

on one end and an

on

the

Band C of

use

stranded

"

other

end

of

the Pictorial.

wire

and prepare the

alligator

the

test

34

Y2

I , I , I ,

X 0

I

1"

2"

3"

1

4"

1

5"

I

6"

J

Page

18

®

~

fUMeHail

PICTORIAL

Refer

to

Pictorial

Be

( )

( ) Install D cells

( ) Carefully peel away the backing paper

sure

position.

holders. Position the positive

to

the positive (+) terminal on

and onto refer communications you have about

14

the

white

identification

the inside

to

the numbers

this

kit.

for

the

following

ON·OFF switch

(1 -1/2

of

the

volt

label. Then

front

panel

with

on

steps.

is

in the OFF (out)

battery) in the battery

(+) end

each

of

each

battery

as this label in any the

holder.

from

the

blue

press

the label

shown.

Be

sure

Heath Company

BUSH I

NG

Detail15A

SM ALL

END

Refer

to

Pictorial 15

Refer to Detail pered . Be sure,

shaft with the small end facing out, or the knob will not slide

it.

onto about it; the bushing will gradually turn toward the small end.)

(Roll the bushing

for

the

following

15A

and notice that the knob bushing is ta-

in

the next step, to

on

a flat surface if you are unsure

steps.

placE!

this bushing

on

the

14

®

f'J\

PUS

H T

HE

KNO B PA

HI

ULLY

TH E BUSHIN

DO

NOT

ALL

ING .

CE

THE

TH

ER

.A NUTDRIVER OR A

SC THE

KNO

LA

CE T

TR

OL

S REMOVED.

OFF

KNOB

FI

RM

50

FT

CLOTH UNDER

TO

PREVENT

REWDRI V

BUSHING INTO

B AS

SHO

HE KNOB

FR

OM

WHI

15

on

fully inserted .

to

DRI VE

I N

UNTI L

,,~

u

NUT

DR IVER

___

\V

o N

rJ'I

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KNOB

m

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B

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B

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LA OR O

PLACE A THE KNOB FR

OM BEI NG MARRED.

USE

RGE

LA DRIVE THE NOT DRIVE I T I N T

CON

WA

PICTORIAL

In

the following step you will install knobs shafts. Perform this step carefully, since it is difficult to remove a bushing from a knob once it

( ) Install knobs on each of the control shafts as shown in

the Pictorial.

is

RT WAY

NG

REMOVE

G AND

THE

OW THE

THE

ON A TA BLE

SURFA CE.

I T THEN

ER

AND

WN . DO

OO

FAR

.

ON THE CH

IT

the two control

( ) Install a knob bushing

shafts.

on

each of the front panel control

This completes to

"Test

and

Adjustment."

the

wiring

of

your

Transistor Tester. Proceed

1J

o

-f

o

:IJ

»

r

...

--

o

()

---

FINAL

WIRING

Refer

to

Pictorial 12 (on

( ) Connect the red wire

( ) Connect

Connect the

Refer

(+

positive

Connect the black

ve

(-)

negati

the

of

jack BB (5-3).

lug

th

Connect

of

jack BC 15-4).

lug

wi

res coming

Red

wire

Green

White-red

White·black wire to lug 2

White·green wire

White-gray Thi

s completes

to

Check Switches C and L should n to

the switch lugs.

to

Pictorial

Page

) terminal

wir

terminal of the meter (5-1).

black wire coming

e white

wire

to

th e lug

of

to

the lug

wire

to lug 1

to

wire

to

lug 2

the

see

that

13 for

th e fol

16)

for

the

following

steps.

coming

of

from

lug 1

wiring

from clamp

the meter (5-1) .

e coming from clamp

fro

coming

from

clamp

AF

jack BD (5-4) .

of

jack

BE

(5·2).

of

batlery

holder

of

battery

of

battery

of

banery

of your Transist or Tester.

all connections are soldered .

Ot

have any wires connected

lowing

steps.

AD

m clamp AG

clamp AG

as

follows:

BG

holder

BH (5· 1).

(5-1

BG

BH (5·1).

to

).

(5·1).

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es

t lead

from

1"

red stranded

2"

of

Pictorial 13. Then install a banana

wire

imilar

manner,

use

as

In a s

black, white, and green test lead

stranded wire and prepare the

s.

- - - - -

~

--

®

o 0

3"

I I I I

4"

5"

~Q:: -~

6"

PICTORIAL

: .

11

;;:J7

Page

19

Figure 1 shows Study

the

switch, control, jack,

If

any

trouble

the

"In

Case

Be

( )

sure

position.

The on

the over while to

properly

the

figure carefully

is

encountered

of

Difficulty"

the ON-

meter

needle

scale as

this

mark,

you

lightly

position

BATTERY TEST

( ) Press

( )

( ) Press

( ) Release

the

following

10mA

BETA = BAT. TEST

Be position.

meter

the deflect off scale

normal.

The

on deflect

position.

00

sure

the

ON-OFF switch

pointer

meter. A new

the

PNP-NPN switch

meter

pointer

the

meter off

scale

the

front

panel

to

identify

and

socket.

in

the

section

OFF

switch

should

shown

slowly

tap

PNP-NPN switch

should be

on

. A new

on

ON-OFF switch

in Figure

turn

the

front

battery the

right side

should

battery

the

right side

be

the

meter

pointer.

panel

to

within

be

TEST

of

the

following steps, refer

on

Page 29.

is

on

the 1_

If

Mechanical Zero screw,

face with

pushbutton

is

the

ON

the

will cause

of

to

the

within

will cause

of

to

AND

Transistor Tester.

function

in

the

OFF

extreme

the

in

(in) position.

BAT OK area on

the

PNP (in) position.

the

left mark

pointer

your

switches:

the

NPN

the

pointer

meter. This

BAT

the

pointer

meter.

OFF

of

OK

ADJUSTMENT

( ) Press

each

TRANS

to

(out)

is

not

finger

(out)

The

to

area

to

(out)

is

Iceo

10mA

Press

the

Press

( ) Adjust

meter

( ) Release

position. reading

(If

the

80,

replace

the

circu it board

between

( ) Remove

resistor

Release

position.

( ) Press

the

FET GM

= 0

100l1A

the

position.

Press

the

Rotate can be scale)

on

properly

the

following

PNP-NPN switch

ON-OFF switch

the

control

pointer

the

The

is

different,

meter

the

noted

the

to

the

following

P CHAN-N CHAN switch

ON-OFF switch

the

SET

positioned

the

.

front

to

on

the

at

the

85

mark on

PNP-NPN switch

meter

reading should

note

indication

batteries

resistor from

inside

ON-OFF switch

Gm = 0

Gm

to

point

front

above

scale,

.)

of

the

is

Then

place

and

the

to

control.

and

panel

pushbutton

to

the

PNP (in) position.

the

ON

circuit

board

the

to

the

position

greater

than

readjust

the

85

the

test leads.

front

panel

to

panel

pushbutton

to

the

ON

If

below

F ET

circuitry

switches:

(in) position.

to

position

leakage scale.

the

NPN

not

change.

of

the

pointer.

90,

or

less

the

control

pointer

mark.

the

(in) position.

the

for

future

OFF

the

P CHAN (in)

meter

0 mark (full

is

half way

Tape

switches:

pointer

operating

the

(out)

If

the

than

on

this

use.

(out)

ADJUSTMENT

( )

Connect jacks.

Connect

( )

blue-blue-black) lead

and

the

test

leads

166.n, between

emitter

to

1%,

(red)

the

appropriate

preciSion

the

collector

test

lead.

front

resistor

(black)

panel

(brown-

test

( )

Release (out) position and

( ) Release

position.

This Transistor Tester. Proceed

the

completes

P CHAN-N CHAN switch

the ON-

the

repeat

OFF

"Test

to

the

previous step.

switch

and

"Final

to

the

to

the

Adjustment"

Assembly."

IN

OFF

of

CHAN

(out)

your

Page

20

GENERAL

The

Transistor Tester measures characteristics characteristics characteristics same type. These characteristics "good" control tested.

Refer

controls, switches,

Transistors may the

Transistor Tester

the

test leads,

(C),

the

to

the

test

FET's transistors), red

test

gate

(G)

connect

INFORMATION

of

transistors

of

that

of a transistor

rating. Also,

·led rectifiers,

to

Figure 1

either

connect

white

test

emitter

lead

of

the

(E)

(field

connect

to

the

green

will even vary between transistors

unijunction

and

for

and

or

lead

of

effect

the

source (S),

device.

test

PICTORIAL

and

the

F ET's (field

tests

give you actual

and

transistors, diodes, silicon

triode

AC switches can be easily

the

locations

connections

be plugged

the

test

leads may be used'.

the

black

to

the

base (B),

the

transistor

transistors)

black

test and

If

the

lead

to

the

second gate (G).

FINAL

16

the

DC

Gm

(transconductance)

effect

not

merely a

and

descriptions

on

the

Tester

into

the

test

lead

to

and

the

being

tested.

or

UJT's

lead

to

the

white

test

transistor has

ASSEMBLY

Refer

~"ii@

#6 , j 18

S

HEET

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AL

SC

REW

This

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OPERATION

When devices are tested

difficult

it

beta

(gain)

transistors),

of operating "bad"

of

.

sockets

To

the

collector

red

test

When

(unijunction

drain

(0),

lead

to

two

gates,

the

use

I'ead you

the the

leads are can usually component

device.

on

or

this will

components. In

piece the

wire.

The black lettering catls

on

transistors are controls performing is

pressed in, refer

Proceed perform the Tester has

to

Pictorial 16 for

the

Install

3/8"

sheet

Remove install them on front

panel as

completes

to

the

to

connect

either

connect

that

To

determine

the

circuit

let

you

of

wire

to

lead

of

the

front

panel lettering

relating

any

to

the

. Remember, it

batteries

not

the

following steps.

cabinet

metal screws.

the

"Operation"

too

is

board, shine a light

trace

cases

the

device;

tested,

of

to

before

been used for

shell on

backing paper

the

cabinet

shown.

assembly

section.

in

·circuit, you may

the

test

leads

short

or

inaccessible.

each

test

connected

where

each foil from

where

printed circuit foil

out

to

the

to

the

particular test

you

to

you can

this

then

connect

is

in

two

the

controls

while

the

F ET testing. Remember, when

following tests,

black lettering; if

red Ilettering.

is

a good idea

use

the

some

the

front

panel

from

the

rubber

shell

and

the

of

your

Transistor Tester.

sometimes

to

the

device because its

In

such cases, you

lead

to

the

lead

the

desired terminal on

connect

through

the

is

impractical, solder a

the

colors, black

used primarily

red lettering calls

if

procedure

Tester, especially if

time.

the

circuit

device

that

is

connected

test

the

TRANS

the

FET

you wish

to

occasionally

rear

of

to

lead

and

with

feet

another

test

the

to

red.

out

switch

#6

and

of

the

find

the

leads

board;

other

short

to

this

The

when

the

switch

is

to

test

the

x

Some transistors have a shield. Leave this lead (bend it transistor

CAUTION: Never device, while power and/or

the

out

test

circuit

of

the

way

socket).

connect

could be damaged.

fourth

disconnected

when

you plug transistors

the

is

applied

lead

connected

in

Transistor Tester,

to

the

test

circuit.

to

an internal

procedure

into

the

or

test

The

Tester

a

BATTERY

Test

the

batteries

Release

1.

position

TEST

as follows:

the

NPN-PNP switch

to

check

one

battery.

to

the

NPN (out)

Page

The possibl e fo r eac c

ol

CLASS

2:

fol

umn

NPN

COLLEC TOR

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SILICON

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FET

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Page

22

~UOJ§i*BM

I

The

following possible applications, and the for

each

column when you select the

CLASS

SIGNAL

INTERMEDIATE

POWER

- - - - -

The beta Xl0,

CAL most often when transistors are tested The chart in Figure 4 shows the relationships current current

collector

case

and

indication

meter

chart shows the three

class.

Use

the figures in the

APPLICAT ION

AUDIO, RF, IF

AUDIO,

SWITCHING

AUDIO,

REGULATOR,

OUTPUT

scale

of

the meter

X5, and

ranges and the

range,

current

as

a general rule, the beta

CAL

calibration

for

instance, supplies a

when the

mu I tipl ied

approximate

current

has

three

Xl

. The

CAL

Xl0

by

the

range for a test.

CAL

settings. The 100

cal

classes

of

operating

current

CURRENT CAPABILITY

1

mA

10 m A - 100 m A I

100

mA

calibration

Xl0

out

maximum

setting

of

ibration

points

setting

of

the

of

is

used

a transistor

setting.

transistors,

current

capability

- 10

mA

- 1 A

----

CAL

is

used

circuit.

the various

mA

of

100

mA

. In this

is

the

For example:

Meter Calibration Setting = BETA=3.5x

However, next

I

lower multiply new

current

factor

of

I

EXAMPLE:

,

I

Meter Select

10) New meter

Calibration setting =

BETA=6.5x

Keep in only

when the meter

for

the 1 A, 100

indication

10 =

if

the meter

current

the new meter

10.

indication

mind

range switch (in this

range provides

indication

lOx

that

the

mA,

= 3.5

CAL

Xl0

35

indication

= greater than 50

current

10=650

and

CAL

10

is

greater than 50,

by 100. Notice

an

additional

range (additional factor

= 6.5

X10

lower

current

is

greater than 50 and

mA

current

case,

10

multiplication

range can

ranges.

press mAl

that

be

the and this

of

used only

I I

I

I I

CURRENT

RANGE

100

1

mA

10

100

1 A

-

~lA

mA

CALIBRATION SETTING

Not

Used

CAL

Xl

CAL

X5

CAL

XlO

CAL

Xl

CAL

X5

CAL

Xl0

CAL

Xl

CAL

X5

CAL

Xl0

CAL

Xl

CAL

X5

CAL

X10

COLLECTOR CURRENT

.1

mA

.5

mA

. 1

mA

1

mA 5mA 10

mA

10

mA

50

mA

100

mA

.1

A .5 A 1 A

Figure 4

BETA MULTIPLICATION

FACTOR

Xl X5 Xl0

Xl X5 X10

Xl X5 Xl0

- -

BETA FACTOR

TO

RANGE

NOT NOT

NOT

Xl0 X50 X100

X10 X50 Xl00

~

-

MULTIPLICATION

AFTER

AVAI

LABLE AVAILABLE AVAILABLE

SWITCHING

CURRENT

J

I I I I

I

I I

I

I I

I

I I I I I

I

2.

Press

the

Press

3. pointer

Press

4.

check

within

5. Release position.

NOTE: Do

any

longer

shortened.

TRANSISTOR

General

Out-of-circuit the

accuracy resistances used.

If you may must

always be

since

the reading. beta

test.

should

the

not

than

beta

of

the

transistor

consider

resistance

To

make a quick

BAT

TEST

switch.

ON-OFF

NPN-PNP switch

other

BAT OK

leave

TESTING

an in-circuit

made

to

fall

within

battery.

mark.

ON-OFF

the

Tester

necessary

(gain)

tests

circuit

the

in

indicates gain

transistor

with

in

the

good

the

or

are

test

which

the

circuit

ON

(in)

the

BAT OK mark.

to

the

The

meter

switch

in

the

battery

always

depends

the

when

to

be

transistor

could

or

bad test,

position.

PNP (in)

pointer

to

the

battery

quite

on

transistor

tested

good.

out

cause

perform

The

position

should

OFF

test

life will

accurate,

the

shunting

in-circuit,

Leakage

of

the

an

erroneous

only

meter

to

fall

(out)

position

be

but

is

being

tests

circuit,

the

Before

you

test a transistor,

to

determine

and

its

The

current

class . Both

be used through a transistor. A schematic identifying

metal cases devices. Medium size metal cases heat

sinks fall

transistors large

heat

Figure 2 However, since know

test

it.

The

schematic transistor show

the Notice the

base a PNP collector-to-emitter negative

determine steps

are

its class (signal,

type

(NPN

or

PNP).

capability

the

specific

to

estimate

the

particular

or

plastic cases will usually be classed as signal

in

the

are

usually large

sinks. Figure 2

shows

several lead

there

the

lead

configuration

diagram can also

type

(NPN

or

symbols

that

the

in

the

transistor.

collector·to-emitter

the

provided

for

arrow

NPN

transistor

Also,

voltage

transistor

to

identify

it

is

intermediate

of a transistor

application

the

amount

application.

intermediate

and

shows

examples

configurations

are

other

configurations,

of

your

PNP). Drawings A both

an

on

the

emitter

and

an

NPN

transistor

while

voltage.

type,

proceed

the

type.

helpful,

and

most

NPN

the

but

power,

is

what

and

the

of

current

diagram

Transistors

transistors

power

generally used

of

transistor

be

used

and B of

and

lead

points

toward

will have a positive

PNP

If

you

with

Page

21

not

necessary,

or

power),

determines

physical size can

that

is

helpful

with

class. Power

each class.

for

transistors.

be sure you

before

to

identify

PNP transistor.

away the

transistor

are

unable

the

test.

passes

small

with

you

the

Figure 3

from

base

in

has a

to

Special

its

in

I I I I I

I

I I

NPN

COLLECTOR

BAS

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(2

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Figure 3

E,,\I

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(uncommon)

TlEE

R

~

o

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B +

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BASE

FET

P

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RA

I N

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INTERMEDIATE

POWER

HEAT

SINK

COLLECTOR

(MOUNTING

0;

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:9

,

BASE

FLANGE)

POWER

o 0

COLLECTOR

(MOUNTING

Q,

EMITTER

'9

'

BASE

FLANGE)

HEAT

SINK

Figure

~

The

following out-of-circuit when

the

circuit

and

procedure

testing.

transistor

repeat

Beta (Gain) Test

1.

Be

sure

the

position.

2.

Identify

3.

Connect connector

4.

Connect connector

5.

Connect C

6. Press

each lead

the

connector

the

TRANS

(white)

(red)

pertains

If

you

is

tested

the

tests

.

ON-OFF

of

the

base (b) lead

on

the

emitter

on

(e) lead

the

collector

(black)

on

switch.

do

not

in-circu it,

swit

ch

transistor.

of

Tester.

(c) lead

the

Tester.

to

obtain

is

the

of

the

of

both

the

remove

in

the OFF

transistor

the

transistor

in-circuit proper

results

it

from

to

and

the

(out)

the

Page

23

If

you

NOTE: the

desired transistors, extend Tester

its range. at

transistor

cannot

calibration mark

pull

the

being

tested

calibration mark

16.

Press

the

BETA Multiply (CAL transistor

B

greater to explained

E

higher) .

A

transistor of retested than

considered

Xl0,

than

provide

less

than

. As a rule,

10

this

indication

CAL

beta.

50, a lower

an

additional

previously

that

10 sh

when

defective.

out

on

If

you

desired

(CAL

switch.

X5,

or

NOTE:

is

tested

ould

be

any

tested

position

the

when

the

BETA

are

still

unable

mark,

is

in-circuit, use

X5

CAL

current

or

Note

by

If

especially

CAL

the

Xl)

the

range

multiplication

(only

on

in-circuit removed transistor

au

t-of-circu it

meter

testing

CAL

to

the

Xl).

meter

calibrati

to

obtain

meter

may

factor

ranges

and

that

from

the

that

has a gain less

pointer

power

control

calibrate

when

indication. on

setting

the

actual

indication

be selected

of

10

mA

has a

circuit

should

at

to the the

is

as

or

beta

and

be

7.

Press

8.

Determine power switch

9.

Identify the type

10. Press

11.

Adjust pointer unable scale, connected

12. Make turned

13. Press

14 .

Rotate meter not defective, NPN-PI\lP switch

15.

Adjust pointer CAL X5, the collector

the

B ETA =

the

or

power).

to

select

the

NPN-PNP

is

not

known,

the

ON-OFF

the

SET BETA

over

to

adjust

the

transi

to

sure

the

fully

the

BETA

the BETA

pointer

move

or incorrectly

the

over

or

CAL

XlO

current

00

switch.

transistor

Then

the

proper

transistor

switch

assume

switch

the

00

mark

the

stor

the

Tester.

BETA

class (signal,

press

cu rrent.

type (NPN

in

the

appropriate

it

to

=

00

on

meter

may

be

CAL

control

pointer

counterclockwise.

CAL

switch.

CAL

control

moves

accordingly.

defl

ects

off

scale,

connected

may

be in

the

BETA

CAL

control

the

desired

CAL

Xl)

calibration

on

the

mark. Lower

accordingly

the

to

be

the

ON (in)

the

beta

defective

control

the

to

wrong

beta

settings

as

approp

or

PNP

position.

an

NPN device.

position.

to

place

scale.

or

if

or

is pu

and

noti

If

the

transistor

the

Tester,

position.

to

place

mark

scale.

shown

intermediate

ria

te

range

).

Then

place

If

the

meter

If

you

it

deflec

ts o

incorrectly

shed

in

ce

that

pointer

does

may

or

the

meter

(CAL

Xl0,

Asa

rule, use

reduce

in

Figure 4 .

the

are

ff

and

the

be

the

The

previous procedure. leakage next

17. R

tests will

two

elease the

If

steps

the

if you

device

further

are

ON-OFF

have

is

test

going

position.

18.

Disconnect the transistor

Transistor Leakage Tests

Leakage out cause

Three made

lcbo the This leakage measu

Ices the to

leeo the This leakage measu

tests

of

the

erroneous

leakage

in

the

is

the

collector

measurement

is

the

measurement

collector

the

emitter.

is

the

measurement

collector

measurement

must

always

circu it,

since

readings.

measurements

following

steps.

measurement

(c)

and

the

should

rements.

(c)

and

the emitter

(c)

and

the

should

rements.

the

of

base

of

of emitter

always

explained

out

of

the

to

switch

from

be

performed

resistance

(lebo,

the

(b)

always

the

leakage (e)

the

leakage

the

transistor

perform

the

Ices,

leakage

with

be

with

(e)

with

be

the

circuit,

the

to

the

Tester.

with

of

the

and

current

the

emitter

the

current

the

current

the

highest

beta

the

following

..

Disregard

leakage tests.

OFF

the

transistor

circuit

leeo)

(l)

between

open

lowest

(1)

between

base

shorted

(I)

between

base

open

of

the

testing

the

(out)

could

will

be

(0).

of

the

(s)

(0) .

three

Page

24

In

other

words, for good

than

lees and

Generally, testing sil:icon transistors. Most low-power have very low leakage current

High-power silicon

/lA.

Germanium microamperes

to

guide germanium manual.

lees

will always

you

will

(lebo) usually less

transistors

to

as high as 5 rnA.

help

you

transistor.

transistors,

not

obtain

with

transistors

have

determine

If

than

an

in

be

less

any

the

may

lebo

if

the

doubt,

lebo

than

measurable

collector

1 /lA

(one

indicate

that

The

following

leakage

refer

will always be less

Iceo.

leakage

sil

icon

to

microampere)

an

Iceo

ranges

is

too

to a transistor

when

transistors

base leakage

up

to

from

several

chart

high

for

is

50

.

a a

3.

Leakage body can increase

As

you

determine

1.

Press

2.

directlV from

3. Press

from

4.

Press

directly

heat

perform

if

the

the the

the

from

current

leakages

lebo

lees leakage scale.

from

holding

the

leakage

the

leakage tests,

switch.

100

,uA

the

switch.

[ceo

the

will increase

are

switch . Read

leakage scale.

switch

Ileakage scale.

current

within

Read

. Read

the

transistor

acceptable

the

fifii§iiBifj]

in

temperature.

in

your

.

analyze

leakage

the

result

limits.

leakage

current

leakage

directly

Even

hand

and

current

I

GERMANIUM TRANSISTOR

RF-IF-AUDIO

AUDIOSWITCHING

POWER

NOTES:

Be

1.

2.

sure

you

If

the the current

the

perform

leakage cu

meter

range .

TYPICAL

LEAKAGE

CURRENT

lebo

I

0-5,uA

0-1'0,uA

5,uA

-

100,uA

I

"B

ETA

TEST"

the

following leakage tests.

rrent

is

greater

pointer

to

deflect

Ices

0-

50,uA I 1

1

,uA-

100,uA

5,uA

1 rnA

has been

than

off

scale,

.-

-

completed

100

select

I

,uA,

leeo

,uA

-

500,uA

5,uA

-

1

mA

50,uA 5mA

before

causing

a higher

5.

6.

Release position

Disconnect

.

the

ON-OFF

transistor

switch

from

the

to

the

Tester.

OFF

(out)

FET TESTING

Drawings C the

schematic transistors) . Notice drain-to-source

schematic

negative

-

The FET's_ Gm This of

the

(matching)

The

out-of-circuit when and

and D of

symbols

drain-to-source

following

characteristic,

foltowing

the

repeat

steps

usually ranges

same

type

that

testing.

FET

is

the

tests.

Figure 3 (fold-

for N channel FET's

that N channel FET's

voltage. Drawings E

for P

channel

Voltage.

measure

between

I ike

beta,

. It

is

also useful

have

the

same

procedure

tested

If

you

in-circuit,

pertains

out

F ET's. These F ET's have a

the

Gm

500

can

even vary

characteristics.

to

do

not

obtain

remove

from

Page 22)

(field

have a positive

and F show

(transconductance)

to

10,000

between

when

selecting devices

both

the

it from

,umhos.

in-circuit

proper

the

show

effect

the

of

F ET's

and

results

circuit

Page

25

Gm

(transconductance) Test

Be

sure

the

1.

position_

2_

Identify each lead

connect

3_

Press

the

4_

Press

the

Press

5.

6.

7. Press

8. Adjust

9. Press

10. Press

11.

The previous steps have explained

If

the will further you are

the

Identify

place

the

position.

the

pointer over

the

Gm scale. Multiply this reading by

If

the

Gm

the

Gm does make sure Tester and proper position. it increases,

If

the 2 switch. change,

device

test

gOing

ON-OFF switch

of

the FET

the

F ET

to

the

Tester.

F ET switch_

Gm =a switch_

100

pA

switch.

the

FET

type

(N

P CHAN - N CHAN switch

ON-OFF switch

the

SET

Gm = a

the

a mark on

Gm switch. Read

is

00

or

0,

GATE 1 switch.

not

the

F ET

the

P CHAN - N CHAN switch

If

the

FET

FET being tested has

The

Gm should decrease.

or

if

it

increases,

is

out

of

the

FET

to

perform

to

the

F ET

change

is

correctly

the

Gm still does

is

defective.

the

circuit,

. Disregard

the

leakage tests.

is

in

the

to

be

tested;

channel

control

the

The

or

P channel).

in

the

appropriate

the

ON

(in) position.

to

place

Gm scale.

the

Gm directly from

1000

to

is

defective.

Gm should decrease.

increases, first check

connected

not

change,

two

gates, press

If

the

Gm does

F ET

is

defective.

the

Gm testing procedure .

the

following leakage

the

OFF

the

obtain

to

is

in

the

GATE

steps if

(out)

then

Then

meter

the

Gm.

If

to the the

or

if

not

test

FET Leakage Tests

Leakage tests must always be

of

the

circu it, since

erroneous

Two the

Igss the the nanoampere range,

FET

Idss

(d) and This of a forward

that helpful

characteristics.

NOTE : you perform

1.

2.

3. Press

4. Press

readings.

leakage measurements (lgss and Idss) will be made

following steps.

is

the

measurement

gate

(g)

and

source. Since

is

defective.

is

the

measurement

the

source

measurement

the

F ET

when

Be

sure

the

Press

the

Be

sure current measurable leakage indicates

the

leakage scale.

range

to

the

source

this

any

(s)

with

is

not

current

between

is

conducting.

selecting

the

"Gm

following leakage tests .

Igss switch.

the

100

/1A

directly

lamA

switch.

Idss switch. Read

obtain a meter

performed

resistances

of

the

leakage

(s)

with

leakage

FET's

current

measurable leakage indicates

of

the

current

the

gate

an actual leakage

100

pA

The Idss measu

(matching)

Test"

has been

switch

is

from

If

the

that

the

necessary, select a lower

indication.

with

of

the

circu it could cause

current

the

drain

is

nominally

(I) between

shorted

current,

and

lOrnA

that

completed

pressed. Read

leakage scale.

the F ET

current

the

FET

(I) between

shorted

the

(s)

to

the

but

to

indicate

rement

is

have similar

the

leakage

is

defective.

directly from

current

out

in

(s)

to

in

the the

drain

source.

more

often

before

Any

12. Release position.

13. Disconnect

the

ON-OFF switch

the

FET from

the

to

Tester.

the

OFF

(out)

5.

6.

Release

position.

Disconnect

the

ON-OFF switch

the

F ET from

the

to

Tester.

the

OFF

(out)

FP~ag:e~2~6~

_

______________________________________________

DIODE TESTING

NOTE: a 1.5 volt conducting,

Some

high voltage diodes,

drop

across

cannot

be

adequately

the

ju

nction

those

tested.

that when

have

the

more

diode

than

~

______________

Press

the

9.

Read

ON-OFF switch

the

leakage

current

scale. This leakage should be

is

microamperes.

10

. Press

the

NPN-PNP switch

~~

~IIIIII~

:=

to

the

ON (in)

directly

from

fess

to

the

PNP (in) p

:=:

the

than

osition.

position

leakage

a few

II

.

Drawings G

and H of

for diodes .

and

diode

the

reverse (leakage)

current

The following

current

the

leakage germanium). Silicon germanium

diodes

microamperes leakage

A good signal

0.8

mA, while a good

forward

The

actual

However,

you

can varactor temperature

The

following

out-of

·circuit testing. when a diode and

repeat

Be

1.

diode

current

zener

if

a zener

assume

diodes

compensated

is

the

tests.

sure

the

greater

voltage

that in

procedure

tested

position.

2.

3.

4.

5.

Identify

Connect connector

Press

the

diode

the

(brack)

the

(red)

TRANS

Figure 3

tests

show

measure

the

current.

depends

diodes

on

the

have very little leakage, while

may have as

current.

will have a forward

power

diode

than

0.8

A.

of

a zener

diode

tests good as a

it

is

good.

Always

the

same

manner

zener

diodes

pertains

If

you

do

not

in-

circuit,

remove it

ON-OFF switch

leads.

cathode

anode

of

the

'lead

the

Tester.

lead Tester.

of

switch.

the

schematic

forward

symbols

(conducting)

Like transistors,

diode

type

(silicon

much

current

as several

greater

(rectifier) will have a

diode

cannot

be

conventional

test

zener

diodes

as signal diodes.

cannot

be

tested .

to

both

in-circuit

obtain

the

proper

from

the

is

in

the

OF

F (out)

the

diode

to

the

diode

to

or

than

tested.

diode,

and

Some

and results circu·it

the

CAUTION : range

11.

12. Release

13

. Disconnect

UJT TESTING

Drawings J for

both

UJT's

Three in

the

Ieb

s

2

emitter

Ib2 b I S

base 2 (b

base 1. between

C

E

Ib2 es base 2

emitter.

In

the

that

exceeds

If

a signal

If a power 1 A switch . than

80

diode

on

the

diode

The

the

position.

the

and K of Figu

the

N channel

(unijunction

measurements

following steps.

is

the

measurement

(e)

and

base 2 (b

is

the

measurement

)

and

2

This

base 1

base 1 (b I )

current

and

V

1.5 Ib2 b

is

the

measurement

(b

and

the

)

2

following steps,

current

is

being

rating

tested,

(rectifier)

meter

indication

leakage scale

ON-OFF

diode

from

switch

the

re 3 show

and

the

transistors).

(leb2 s,

Ib2 b I

s,

of

leakage

)

with

base 1

of

forward

with

the

converted

can

2

be

base 2) as follows :

(battery

IS

emitter

voltage) =

of

emitter

(e)

with base 1

do

not

of

the

press

is

being

should

for

both

to

Tester.

the

schematic

P channel

and

Ib2 es) will be

current

shorted

current emitter to

Rbb

current

select a

diode.

the

1 mA

tested,

types

the

OFF

(uncommon)

([)

between

(s)

(I)

shorted

(the

(I)

shorted

current

switch.

press

be

greater

of

diodes

(out)

symbols

made

to

base

through

(s)

resistance

between

(s)

to

the

.

the

2.

to

the

6.

7.

8.

Press

the

Press

the

Be

sure

position.

100

JJA

switch.

Iceo switch.

the

NPN·PNP switch

Because must leakage

is

in

the

NPN (out)

1.

only

be

tested

indications

Be

sure

leakages

are

out-of-circuit

caused

the

ON-

measured,

. This will

by

circuit

OFF

unijunction

eliminate

resistances.

switch is in

the

transistors

erroneous

OFF

(out)

position.

Page

27

Identify

2.

3. Connect the

the

leads

emitter

of

connector (white) on the Tester.

4.

Connect the connector (red)

Connect the

5. connector (black)

Press

6.

7.

Press

8.

Identify

9.

place the P

the F

the

the 100

ET

Igss

the

UJT

CHAN-N

base

of

base 2 (b

of

switch.

switch .

/lA

switch.

type

position.

Press

10.

11.

the ON-OFF switch

Read

the Ieb2 s leakage

leakage

Press

scale.

the 1

mA

Th

is

leakage should

switch .

the UJT.

(e)

lead

)

1 (b

lead

l

the Tester.

)

lead

2

the Tester.

(N

channel

CHAN

current

of

the

UJT

to

the G I

of

the

UJT

to

the

of

the

UJT

to

the D

or

P channel). Then

switch in the appropriate

to

the ON (in) position.

directly

be

less

from

than 1 !1A.

Press

13.

14.

If CHAN

S

is CHAN

emitter

This

15.

Release

position.

16. Disconnect the

seR

TESTING

NOTE: a 1.5 conducting, cannot

Drawing L

the

SCR

(silicon

The

following

be

properly

the

100

mA

switch.

the

UJT

is

an

N channel UJT, place the N CHAN-P

switch in the P

a P channel

switch in the N

current

(uncommon)

is

nominally

Ib2 es

CHAN

UJT, place the N CHAN-P

CHAN

directly

between 15

the ON-OFF switch

UJT

from

the Tester.

Some high voltage SCWs, those

volt

drop

across the gate

be

adequately tested.

of

Figure 3 shows the schematic symbol

controlled

test

turned

will on

and

rectifier).

chack the

turned

junction

SCR

off.

(in) position.

(out) position.

from

the

leakage scale.

to

60

to

the

OFF

that

have more than

when the

to

determine

If

Read

mAo

the

SCR

if it

UJT

the

(out)

for

can

is

an

12.

Press

the Idss switch.

from

the leakage scale. This current

between

150 base

flA

1 and

and

dividing 1.5 volts (battery voltage) For example:

1.5 V= Rbb

[b2 b

s

l

[b2 b

=

S

l

~=

.

00025A Rbb =

6000

Read

the Ib2 b I S

400

riA. R bb (the resistance

base

2)

can

be

by

250

/lA = .000250A

6000n

n

current

is

obtained

the

current

directly

normally

by

(I).

The

following

out-of-circuit

an

when

SCR

procedu

testing.

If

is

tested in·<:ircuit, remove

and repeat the tests.

1.

Be

sure the ON-OFF switch

position.

Identify

2.

Connect the gate

3.

the leads

connector (white) on

4.

Connect

the

anode

connector (red) on the Tester .

5.

Connect the cathode (c)

connector (black) on

6.

Press

the

TRANS

re

pertains

you

do

of

the

(g)

the

(a)

the

switch.

not

SCR.

lead

Tester.

lead

Tester.

to

both

obtain

is

in the OFF

of

the

of

the

of

the

in-circu

the

proper results

it

from

SCR

the

to

it

and

circuit

(out)

the B

the

the C

E

Page 28

Place

the

NPN

7.

Press

8.

9. Press

10. Press the ON-OFF switch

11. Press

the

SCR should now be

ind icate

-PNP switch

Iceo switch .

lA

switch.

Ices switch;

50

or

greater on

to

the

then

press

turned on.

the

leakage scale.

112. Momentarily disconnect and

cathode The scale.

13. Release position.

14. Disconnect

TRIAC

NOTE:

a 1.5

volt

conducting,

Drawing M Figure 3 shows (triode AC switch).

The following tests will check

be properly

The following procedure pertains out-of-circuit when a triac

repeat

and

(c) lead .

meter

the

The

should indicate less than 5

ON·OFF

the

SCR

TESTING

Some

high voltage triacs, those

drop

across

the

cannot

turned

the

be

adequately

on

and

testing. is

If

you

tested in-circuit, remove it from

tests.

SCR should now be

switch

from

the

gate

junction

tested.

the

schematic symbol for a Triac

the

triac

turned

off.

do

not

the

PNP (in) position .

ON

(in) position.

the

Iceo switch.

The

meter

then

reconnect

on

to

the

Tester.

that

have

when

to

determine

to

both

in-circuit

obtain

the

proper

turned

the

OFF

more

the

The

should

the

off.

leakage

(out)

than

triac

if

it can

and

results

circuit

2. Identify

Connect

3.

connector

4.

Connect (red)

Connect

5. connector

6. Press

7. Place

8. Press

9. Press

10

. Press

11. Press

is

12. Momentarily

cathode The scale.

13. Press

14. Release

position.

the

leads

of

the

gate

(g)

(white)

the

on

the

(black)

the

TRANS

the

NPN-PNP switch

the

Iceo switch.

the

1 A switch .

the

ON-OFF switch

the

Ices switch; triac should now be indicate greater

(c)

meter

the

NPN-PNP switch

The

triac

should

11

and

12.

the

on

hot

lead

Tester.

common

on

switch.

than

disconnect

lead.

The

should indicate less

remain

ON-OFF switch

the

triac.

lead

of

the

Tester.

of

the

triac

lead

of

the

Tester.

in

the

to

the

then

press

turned on. The

50

on

the

leakage scale.

and

triac

should

to

the

turned

the

triac

to

the E connector

the

triac

to

NPN (out)

ON (in) position.

the

Iceo switch . The

then

now be

than

5 on

PNP (in)

off

. Now,

to

the

position.

meter

reconnect

turned

the

leakage

position

repeat

OFF

should

the

steps

(out)

the

off

B

C

.

1.

Be

sure

position.

the

ON-OFF switch IS

in

the

OFF

(out)

15. Disconnect

the

triac from

the

Tester.

IN

CASE

OF

DIFFICUL

TV

Page

29

This section first

part, describes right

aher

The second part, to

assist Troubleshooting or

if

difficulties some time. The difficulties solutions

Try

to have before starting any troubleshooting procedure. This can usually

your

Tester

the

"Operation"

GENERAL TROUBLESHOOTING

NOTE: The

apply them

Recheck

1.

on the Pictorial helpful who something

of

the Manual

titled

"General Troubleshooting

what

to

do

your

Tester

titled

you

in

servicing the Tester

Information"

occur

"Troubleshooting

that

could raise along

to

those

difficulties.

analyze

be

the

symptoms

accomplished

to

determine abnormal operations. A review

section may help.

following

to

one

part

the

wiring. Trace

to

have a

is

not

familiar

you

have consistently overlooked.

is

divided

about

the

difficulties

is

assembled.

"Troubleshooting

fails

to

after

your

Tester

of

any problem you

by

trying

the various functions

checks of

the

as

it

friend

will

kit

each

is

checked.

check

with

be

at

a time.

lead in colored pencil

your

the

into

clear

has Chart" with

most

unit

two

parts. The

Information:'

that

may occur

Chart."

is

provided

if

the "General

up

the problem,

been

in

use

lists possible

several possible

might

for

INFORMATION

effective

It

is

work.

frequently

Someone

may

notice

if

you

of of

make

sure

they

are

soldered Builders Be eral

3.

Check solder bridges between adjacent connections. Remove any solder bridges between the excess iron.

4.

Check discolored, would

5.

Be positioned

6.

Check all

boards . Make sure circuit connections

7.

Check all wires

switches. Make sure the wires lugs. Make sure all wires are

Guide."

sure

all

wires

each

solder

each

indicate

sure

the

board and come in

Reheat

wires

are

connected

circu

it

two

flows

resistor value carefully. A resistor

or

cracked.

that

diode

correctly.

component

or

parts.

that

soldered

board

by

holding

points

down

it

is

the

are connected

as

described

any

doubtful

at

places

.

foil

to

be

a clean soldering

that

are bridged

onto

the

tip

or

shows

any

is

faulty

and should

installed

leads connected

leads

with

do

not

extend through the

contact

to

do

not

properly

connections.

su

re

of

sign

the banded end

to

the

touch the other

soldered.

in

the

"Kit

where

sev-

there are no

iron

until

the

soldering

that

of

bulging

be

replaced.

the

circuit

with

other

circuit

board

tip

is

2.

About

90 %

not

function soldering. nated

by a careful

of

the

kits

properly

Therefore,

that

are

due

to

poor

many

troubles

inspection

returned

connections

of

connections

for

can

repair

be

elimi-

do

and

to

NOTE: difficulty, inside the rear cover located inside the

In

an extreme

refer

to

front

case

where you are unable

the

"Customer

of

the Manual.

cover.

Service"

Your

to

resolve a

information

Warranty

is

Page

30

TROUBLESHOOTING CHART

IE:

~f§f%dB¥;j]

SYMPTOM

Meter inoperative.

Meter pegs left when

Meter pegs right when Beta

pressed in.

No

full scale deflection; Beta control pulled clockwise.

out

and

I

Current range different

indicates.

or

Function

improperly.

mode switches operate

turned

than

on.

Cal

label

switch

Cal

fully

POSSIBLE CAUSE

Shorting wire across meter terminals.

1.

Batteries

2. Set Beta =

1.

Meter leads or

2. One

3.

is

I

Transistor leads incorrectly connected.

1.

Batteries weak or have

1.

Remove batteries, bend battery holder ends

inward the

contact.

Control R 1

2. the Page 19.

Range switch wiring. Trace wiring from

1.

switch

2.

Shunt

Function

1.

all

the

not

installed

00

control

battery

or

both

batteries installed backwards.

and

replace

batteries

"Test

wires associated with these switches and

circu it board.

in

out

and

Adjustment"

to

circuit board.

resistances. Check R

and

mode

or

weak.

turned

fully counterclockwise.

leads interchanged.

poor

connection.

the

batteries. Rotate

the

holders

of adjustment. Refer

to

insure good

section on

1,

R2, R3,

switch jumper wires. Trace

to

and

I

R4.

@

~

f§f%iUHfi

SPECIFICATIONS

DC

Beta 1

Collector Currents Available

to

5000

with

to

50,

1 5

to

250,

10

to

500,

50

to

2500,

100

to

5000.

1 rnA, 5 rnA,

o

to

50,000

the

following ranges available:

10

rnA,

50

rnA,

pmhos.

100

mA,

500

mA, and 1 A.

Page

31

Leakage Measurements

(Iceo, Ices, Icbo, Idss,

Out-of-Circuit Accuracy

In-Circuit Accuracy

Diode Test

SCR

and

Unijunction Transistor Test

Power

Dimensions

Net Weight (Less batteries)

....

Triac Tests

(overall)

Igss)

current

Five

0·100

0-1

rnA,

0-10mA,

0-

100

D-1A

±2%, ±2%

Indicates good or bad transistor, FET, diode, SCR,

Tests

(out-of-circuit).

Tests for proper

Measures leb

Two 1-1/2 volt D cells.

9-9/16"

3-1/2Ibs

pA,

rnA,

arc

for

wide x

.

ranges, ±5%.

for

DC

beta

forward

S,

2

8-5/8"

conduction

Ib2 b)

s,

deep x

and

leakage.

and

blocking.

and Emitter

5-1/4"

and reverse leakage

Current

high.

(out-of-circuit).

or

triac.

The

Heath Company reserves products and incurring any obligation products previously sold.

to

change specifications

•

the

right

to

at

any

time without

to

incorporate new features

discontinue

in

Page

32

I~~

fUMf*!{*iil

Refer

to

the Schematic Diagram

while

you read

this

"Circuit

General Consideration

All

of

the

following transistors equally

the

must

Diode to

0.6 volts. Capacitors occurring in limit short are

All

(out) represent a particular test related

BATTERY

Each

NPN-PNP

or

to

PNP

polarity

be

the

110t

switches are shown on

of

reversed.

D11protects

the

current

circuit

occurs.

shown in

position

particular

to

that

TEST

battery

switch

circuit

IN

channel F ET's. The descriptions ali transistors and P channel the

meter and

the

meter

device being tested. Resistors R5 and to

protect

For

the

following

even

though

test. This enables

circuit

by

test.

is

tested

separately.

connects

CIRCUIT

(fold-out

Description."

explanations refer

both

batteries

by

limiting

C1

and

C2

controls R11

simplicity,

partial schematics.

the

th

pressing (mentally)

battery

the voltage across

prevent oscillations

the

Schematic in the released

is

configuration

you

The

NPN

82

DESCRIPTIION

from

Page

41)

only

to

NPN

so

apply

FET's

except

that

(B

1 and B2)

it

from

R6

and R 12 in

above components

to

only

position

into

case

does

not

easily trace a

the

switch

of

the

battery

a

testing

connects simulating each This adequate

When across

5. battery more), on

battery assures

The

the

circuit.

the

meter,

the

meter.

The

battery

operating

while

that

current

62

1.

Sv

81

the

and

1+

I

BAT

Bat Test switch

battery

voltage.

now

meter

terminals

functioning

If

pointer

I

PNP

position

into

the

conditions,

battery

the

battery

voltage

R2

1.SI)

TEST

Figure 5

is

the

battery

will

of

the

'battery

to

testing

is

connected

voltage

for

pressed, resistor

load as a voltmeter,

fall

is

capable

the

tests.

the

battery.

is

serviceable (0.9

within

NPN-PN

being

the

IP

circuit. A load,

measured.

of

supplying

R2

is

See

measures

Bat

OK

switch

across

placed

Figure

the

volt

or

mark

TESTED

~

RX~

R8

., 10K Q

1 A

i

)

0

100 m A

R 1

15Q

1

BETA==

10mA

~

R 2

I)

1 5

"1

+ -

82

5V

~

RJ

lS

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rn

A

~

166

Figure 6

R 4

SET8 ETA·c,a

R

11

IS K

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+

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//~

I R l

82

Page

33

BETA =

The primarily resistance, R8,

This Figure 6. in-circuit circuit means of in transistor

Resistors R 1 1 A does

00

"beta

=

compensates

circuit

Resistor

resistance,

to

another,

of

balancing

beta

can

now

subsequent

collector

through 1 mA

not

use a

00"

circuit,

and

is

basically a

be

tests

through

meter

as

shown

for

in-circuit

Rt

Rx . Because Ax varies

control

the

achieved

current.

ranges shunt

resistances,

bridge

represents

R11 (Set

bridge

since

will be

R4

are

meter

respectively. The

resi

the

circuit

load

circuit

any

directly

stor.

in

transistor

. A

shunt

Part A of

Rx.

as

shown

resistor R8 plus

Beta

true

unbalance

associated

resistances

Figure 6,

collector

in

Part B of

widely

from

= 00)

provides

representation

that

with

100

flA

load

any one

occurs

the

for

the

range

BETA CAL

The

base

through

7.

Control

until

sufficient

place

the collector you

selected.

a

Because resistance, the

following

the

collector

Notice

This

total

than

the

range. Thus, when

read

will

of

the

transistor

control

current

that a shunt

resi

R12

adjusts

collector current

pointer

is

resistor

the

meter

tests

cu

rrent.

resistance

stance

1/

10

the

(Beta Cal)

over

now

R 1 0

and

to

measure

resistor

(R

of

the

meter

current

is

now

and

the

base

the

CAL

equal

to

is

the

same

resistor A10

base

is in parallel

1 0

and

its

meter

is

placed

measured

connected

resistor

current

flows

through

X10

mark

the

particular

value as

can

current

shunt)

and

its

in

into

R10.

of

(full scale) .

be

interchanged

without

with

is

ten

shunt

the

collector

the

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the

transistor

the

current

the

resistor

times

for

base

circuit,

circuit

Figure

meter

to

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the

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by

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to

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beta

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beta.

the

10

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result can be

is

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mark

the

assume

will

deflect

a multiplier

adjusted

(full scale), a device . Now, that

full scale

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place

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from

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meter

current

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meter

flows.

and

indicate

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formula

10 n1 A

~

R 4

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1660

Figure 8

that

the

is

in

the

shunt

the

meter

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base

the

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pointer

is

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,

beta

:

1

mA

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IC = 10mA= IB

1 mA

lebo, lees, AND leeo

Leakage meter transistor to 1 ampere, depending the microamperes the

lebo

the open

lees

of

the

in

connected

a

Ieeo

=

the open

currents

(and

leakage

circu it.

is

the

collector

(unconnected)

is

the

collector

is

the

collector

(unconnected)

10

are

its

shunt

leads.

The

currents

(pA),

measurement

and

the

. See Figure 9 .

measurement

and

the

to

the

emitter

measurement

and

the

. See Figure

measured

resistance)

meter

indicates

on

the

are

quite

the

transistor

of

the

base

of

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emitter

. See Figure

of

the

emitter

by placing a

in

series

leakage

current

small, usually

must

cu

rrent

the

transistor

current

of

the

transistor

10.

current

of

the

transistor

11.

with

range

be

that

battery

two

current

selected

measured

removed

flows

with

the

flows

with

flows

with

and

the

of

the

from

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from

between

emitter

between

the

base

between

the

base

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series with

Figure 12. This

will be used

Gm test. pointer not may be

B1

and

the

Control R11

over

connected

to

the

Gm

control meter circuit

measure

R11 (Set Gm = 0) are placed in

and

shunt

resistor

forms a

the

is

shunt

source-to-drain resistance in

adjusted

here

0 mark (full scale). Notice

into

the

circuit

at

this time, even

to

the

Tester

.

L..

type

to

_______

R7

as

shown

ohmmeter

place

the

that

the

though

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that

meter

FET

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B2

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l.

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14

Figure

typical

2

13

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ohmmeter

that

scale.

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4 .

Figure

in

the

this test,

connected

in

the

shunt

drain

In

drain-to-source resistance has a Gm

is

it

because drain-to-source resistance is

because

the

FET

shunts

the

and

with

shunts

Gm

meter

source

the

meter.

most

of

is

high,

the

very little

scale

leads

An F ET

that

the

meter

Gm

meter

is

similar

of

the

with

approaches

current.

approaches

current.

FET

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to

are

a low

This

If

the

This

a

Because

resistance,

Gm

(transconductance)

an

ohmmeter

type

is

the

circuit

can measure Gm . See

reciprocal

of

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(the

meter

of

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Gate 1 test

2

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similar

places a reverse bias

through resistor R9. Th

to

become

electrically narrower, increasing its

to

the

Gm circuit. See Figure

is

causes

the

on

channel

resistance, decreasing its Gm. A noticeable decrease should be

If

apparent

the FET reverse bias should also be

Igss

AND

Idss

Leakage currents are measured

meter (and ,its

when

the

Gate

1 switch

is

a dual gate device,

the

second gate. A noticeable decrease

apparent

shunt

when

resistance)

the

Gate 2 switch

by

placing a

in

series

Gate 2 switch will

with

is

pressed.

battery

is

two

the

gate

of

in

Gm

in

Gm

pressed .

and

the

of

the

FET

leads. The

meter

ampere, depending

leakage

microamperes

currents

(riA),

circuit.

19ss

is

the

measurement the to

the

1dss the

dra in and

to

the

gate and

is

the

source

source. See Figure 15.

the

measurement

the

source.

See

indicates leakage

on

the

cu

are

quite

the

FET

of

the FET

of

source

of

the

Figure 16.

current

rrent

range selected. Since

from 0

small, usually measured

must

be removed from

the

current

the

current

FET with

with

that

flows

the

drain

that

flows between

the

gate

connected

to

1

the

in

the

between

Page

38

B1---.::

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CHASSIS

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Page

39

NOT E : you foll owi

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B.

part shown

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CIRCUIT

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to

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ceed

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in

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Step-by·Step instructions

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Heathkit IT-3120 User guide

Specifications and Main Features

Frequently Asked Questions

User Manual