Comparison of Voltage Divider In-phase and Quadrature Error Measurement Between NMIA and NIM

Abstract

This paper describes the comparison of quadrature and in-phase error measurement using the NMIA Inductive Voltage Divider (IVD) and the NIM Resistive Voltage Divider (RVD) between NMIA and NIM. The IVD provides output to input voltage ratios of 0.001 to 0.01 with standard uncertainties between $0.008\times 10^{-6}$ and $0.04\times 10^{-6}$ at frequencies up to 1 kHz. An RVD of a series-parallel structure has been proposed by NIM. The RVD provides an output to input voltage ratio of 0.01 and has been self-calibrated with in-phase and quadrature standard uncertainties better than $4\times 10^{-6}$ at frequencies up to 1 kHz. Both in in-phase and quadrature errors of the IVD and RVD have been compared at frequencies from 40 Hz to 1 kHz at the voltage ratio of 0.01. The measurement results show agreement within $2\times 10^{-6} \mathrm{V}/\mathrm{V}$ for inphase errors and $2.5 \mu \text{rad}$ for quadrature errors at frequencies up to 1 kHz.