Answered: Introduction: For ohmmeter testing…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Introduction:
For ohmmeter testing purpose, an NPN transistor is similar to two diodes back to back, as shown in figure 12b. there exists two PN junctions, base-emitter and base collector. When each of these junctions is forward biased, the positive lead of the ohmmeter must be connected to P material, and the negative lead to the negative N material (Figure 12c). there should be low resistance reading when these junctions are reverse biased, positive lead to N material and negative lead to P material (figure 12d).

The PNP transistor can be tested with a similar method, except that the diodes are face to face as shown in figure 12e. this simple test determines if the transistor is shorted or open on a go (no problems)/no go (it has problems) basis.

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Fill-in Questions:
1. A forward-biased PN junction on a good bipolar transistor has
resistance.
2. A reverse-biased PN junction on a good bipolar transistor has
resistance.
3. A forward-biased PN junction with a high ohmmeter reading indicates that the
transistor is
4. A reverse-biased PN junction with a low ohmmeter reading indicates that the
transistor is

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