Heathkit IT -3120 User Manual

Heathkit@ Manual
for the
FET/TRANSISTOR
TESTER
Model IT -3120
595-1989-04
• • - '':It
TABLE OF CONTENTS
Introduction .. . .. . . . .. .. . .... . .. . ...... . .. .. . . .. . .... 2
Operation
...... .. . .. ..... . ....... . .. . .... . .. . . ..... 20
29
30
31
32
38
39
41
Test and Adjustment ... . ..... . ...... . . .... . . .. ..... .19
Final Assembly . .. ...... . . . .. . . . . . . . ..... . . ....... . . 20
Parts List . . .
.. ... . ... . . . .. . . ... . .. ... . .... . . ........ 2
In Case of Difficulty . . .. . .. . ..... . . . . . . . . . . . .. .......
Assembly Notes .. ........ ... . ..... . .. ... . . . .. . . .... .4
Troubleshooting ... . . ....... . ..... .. .. . ....... .
Step-by-Step Assembly
..... . . .. ... . . . ..... . .. . .. ... .. 5
Specifications . . . .. ..... . .. . . . .. . . . ...... . . . . .......
Subpanel Assembly and Wiring . . ...... . . . .. . . .. .8 Circuit Description ....... . . . . .. . . . . . ...... . ..... .. . .
Front Panel Assembly and Wiring
.. . . . ...... . .. . 13
Chassis Photograph ......... . .. . ... . . ...... . . .. ... . .
Subpanel Installation
........... ..... . . . . .. . .... 15 Circuit Board X-Ray Views .... .. .. . .. ..... . . .... . . . . .
Final Wiring
.. . .. .. .. . ......... . .. . . . .. ... . .... 17 Schematic ... (Fold-out from page) . .. . . .. .. ......... . .
HEATH COMPANY
BENTON HARBOR, MICHIGAN 49022
Warranty ..... . ... . . .. ......... . .. ... Inside Front Cover
Customer Service
... . . ... . .......... .. Inside Rear Cover
Copyright
© 1976
Heath Company
All Rights Reserved
Printed in the United States of America

Heathkit IT -3120 Specifications

General

Model	IT-3120
Manufacturer	Heathkit
Category	Test Equipment
Power Supply	120V AC, 60 Hz
Inductance Range	0.1 μH to 1000 H
Resistance Range	0.1 Ohm to 10 MOhm

Summary

Step-by-Step Assembly

Subpanel Assembly and Wiring

Front Panel Assembly and Wiring

Subpanel Installation

Final Wiring

Test and Adjustment

Battery Test

Adjustment

Final Assembly

Transistor Testing

Beta (Gain) Test

Transistor Leakage Tests

Procedures for measuring Icbo, Ices, and Iceo leakage currents for transistors.

Gm (transconductance) Test

FET Leakage Tests

Procedures for measuring Igss and Idss leakage currents for FETs.

Diode Testing

In Case of Difficulty

General Troubleshooting Information

Troubleshooting Chart

Specifications

Circuit Description

UJT Testing

SCR Testing

Triac Testing