The purpose of this guide is to recommend methods of measuring power factor for inductive test circuits, so that the preferred method giving the greatest accuracy is recommended for any particular circuit.This guide describes three methods used in the measurement of power factor of inductive low-voltage (1000 volts and below) test circuits. These methods may be used at any frequency; however, the values in the tables are specifically for 60 Hz test circuits. These methods are 1) ratio method, 2) dc decrement method, 3) phase relationship method. Table 1 lists the preferred method to be used for different levels of test currents and for different levels of power factor. While this guide is primarily intended for use on low-voltage test circuits, the methods discussed are also usable at higher voltages.
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