Meter Voltage Measurement

Authored by: Alessandro Ferrero

Measurement, Instrumentation, and Sensors Handbook

Print publication date:  February  2014
Online publication date:  February  2014

Print ISBN: 9781439848913
eBook ISBN: 9781439848937
Adobe ISBN:

10.1201/b15664-21

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Abstract

Instruments for the measurement of electric voltage are called voltmeters. Correct insertion of a voltmeter requires the connection of its terminals to the points of an electric circuit across which the voltage has to be measured, as shown in Figure 18.1. To a first approximation, the electric equivalent circuit of a voltmeter can be represented by resistive impedance Zv (or a pure resistance Rv for dc voltmeters). This means that any voltmeter, once connected to an electric circuit, draws a current Iv given by

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