To test for metrology accuracy in the electricity meter configuration, a source generator is used to provide the voltages and currents to the system at the proper locations mentioned in Figure 3-9. In this design, a nominal voltage of 120V between the line and neutral, calibration current of 10A, and nominal frequency of 50Hz are used for each of the two phases.

When the voltages and currents are applied to the system, the system outputs the cumulative active energy pulses and cumulative reactive energy pulses at a rate of 6400 pulses per kWh. This pulse output is fed into a reference meter (in the test equipment for this reference design, this pulse output is integrated in the same equipment used for the source generator) that determines the energy % error based on the actual energy provided to the system and the measured energy as determined by the active and reactive energy output pulse of the system. For the split-phase configuration, cumulative active energy error testing, cumulative reactive energy error testing, individual phase active energy testing, and frequency variation testing are performed after performing the energy gain calibration and phase compensation as described in Section 3.2.4. In addition to the energy error tests, the RMS voltage % error and RMS current % error are measured as well.