COMPOSITE MILLIOHM-METER FOR RESISTANCE MEASUREMENT OF PRECISION CURRENT SHUNTS IN INDUSTRIAL ENVIRONMENT

摘要

A composite milliohm-meter (Com-mOhm), based on standard four-wire Kelvin resistance measurement method, was developed for measurements of precision current shunts used in an industrial environment. The system is comprised of a precision, temperature compensated, low drift, high stability 100 mA current source and a 4 ? digit commercial multimeter. Due to the set of specific demands and conditions concerning the industrial applications of precision current shunts, standard measurement equipment and methods could not be implemented. The composite resistor standard was used for temperature stabilization of the precision current source based on precision voltage reference REF102. The measurement precision of ±0.1 milliohms is observed during measurement of 20 milliohm current shunts.