Comparison amplitude error of current shunts at frequencies up to 100 kHz between NMIA and NIM

Abstract

This paper describes the comparison of amplitude error measurement in current shunts between NMIA and NIM at frequencies from 1 kHz to 100 kHz. A set of cage design shunts has been developed at NMIA and its amplitude errors determined using the ac-dc transfer setup at NMIA. At NIM a set of Inductive Current Dividers (ICDs) with ratios of 2:1, 5:1 and 10:1 has been developed to compare the amplitude errors of two shunts. Based on two totally different measurement methods, a number of current shunts have been compared at frequencies from 1 kHz to 100 kHz. The measurements of amplitude errors of current shunts yield excellent agreement within $10\ \mu \mathrm{\Omega}/\mathrm{\Omega}$ at frequencies up to 100 kHz and currents from 0.5 A to 10 A.