A simple and accurate resistance comparator with a long-scale ratiometric digital multimeter

Martina Marzano, Vincenzo D’Elia, Massimo Ortolano, Luca Callegaro

Abstract

This paper describes a resistance comparator, based on a long-scale digital multimeter, suitable for primary resistance metrology. The comparator measures the resistance ratio between two fourterminal standards from the readings of the multimeter, when operating in the voltage ratio mode. The quasi-simultaneous measurement of the resistors voltages strongly relaxes the stability requirements of the driving current source with respect to other published comparators, which are based on a shuttling voltage reading. Measurements between resistors of nominal value 12 906 Ω (the quantized Hall resistance) agree with a reference value, given by a dc current comparator bridge, within a few parts in 108 .

Keywords

resitance comparator, digital multimeter

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IMEKO-TC4-2023-09.pdf

DOI

10.21014/tc4-2023.09

IMEKO TC

TC4 - Measurement of Electrical Quantities

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