Determination of phase angle errors of current shunts for wideband power measurement

A new phase comparator for current shunts with frequency range to 1 MHz has been developed and a new method to determine the absolute phase angle error of current shunts is described. Preliminary expanded uncertainty of the absolute phase angle error for a reference shunt with resistance 1,5 Ω is ±200 μrad at 1 MHz. Based on the reference shunt the phase comparator is used to determine the phase angle errors of a shunt set. At 5 A, 100 kHz the new determination agrees within the expanded uncertainty ±100 μrad with our earlier realization.