# USING YOUR METER: VOM and DVM Multitesters (Radio Shack, 1985) -- Contents and Intro

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## PREFACE

Based on the 1985 book:

USING YOUR METER VOM and DVM Multi-testers

By Alvis J. Evans

Making basic electrical circuit measurements of voltage, current, or resistance with a meter helps significantly in understanding an electrical circuit to tell if it is operating properly or if repair or maintenance is necessary to correct its operation.

This guide has been written to help you understand how meters work and how to use them to make basic electrical measurements. It very much emphasizes "how to do" the various measurements. In addition, it provides understanding of basic concepts and fundamentals, so that you have more appreciation of what is actually happening in the electrical circuit being measured. It is fully illustrated to visually enhance the understanding.

The guide begins by explaining the basic concepts of a VOM and DVM, relating how the analog and digital meters differ, and the advantages and disadvantages of each. Following a discussion about multitester measurements, where polarity, reference point, meter loading, are the topics, basic de and ac measurements are discussed with actual step-by-step procedures defined for voltage, current, and resistance measurements. These principles are then applied to measuring individual components -- resistors, capacitors, inductors, semiconductor devices --individually and in circuits. The guide concludes with numerous electrical measurements on common systems around the home. Power distribution, lighting, heating and air conditioning, appliances, smoke alarms, cassette recorders/players and automotive circuits are included. After reading this guide and following its' suggested procedures, you should be able to make circuit measurements and detect improper circuit operation. We wish you success -- the rest is up to you.

AJE; MP

A DIVISION OF TANDY CORPORATION, FT WORTH, TEXAS 76102

This guide was developed and published by: Master Publishing, Inc., Dallas, Texas, USA.

Design and artwork by: Plunk Design, Dallas, Texas, USA

Printing by: Arby Graphic Service, Inc., Chicago, Illinois, USA