scope:

This document establishes standard definitions for the measurement of AC, DC, and AC+DC voltage; current; electrical power (active, reactive, and apparent); AC electrical energy (active, reactive, and apparent); and power factor in terms of sampled voltage and current measurements. The definitions are provided to facilitate uniform comparison of the voltage, current, power, energy, and power factor measurement values reported by electricity meters in comparison to equipment used as reference standards that implement these definitions for the determination of meter accuracy in the time domain and frequency domain. In the limit of "perfect implementation," the answers given by the time domain and frequency domain formulas should give the same answers within the claimed uncertainty limits.