Inductance Measurement Using an LCR Meter and a Current Transformer Interface

Abstract

This paper describes a new inductance measurement system based on a commercially available LCR meter, a commercially available audio frequency capacitance bridge, 4 terminal-pair (4TP) capacitance and resistance standards, and a multi-stage, programmable-ratio, current transformer. The described measurement system synthesizes equivalent inductance values using the current transformer to combine the applied currents through programmable resistance and capacitance standards. The system takes advantage of the inherent measurement linearity of the LCR meter, and achieves acceptable inductance measurement uncertainty over the 50 Hz to 20 kHz frequency range