Error Analysis of Improved Current‐Bridge Method for Accurate Low‐Impedance Measurement

Abstract

SUMMARY The improved current‐bridge method and its mathematical mode are proposed for accurate low‐impedance measurement. To realize the accurate measurements of shunt resistors smaller than 1 mΩ, the expansion of current ratio of a current transformer and a current comparator, the use of low‐value resistance for reference impedance, and the development of a buffer amplifier which have flat load characteristics are required. The improved current bridge‐method has the possibility for accurate measurement of shunt resistors up to 10 μΩ.