A Combined Transformer Bridge for Precise Comparison of Inductance with Capacitance

A combined transformer bridge, composed of two alternately balanced transformer bridges, designed for precise comparison of inductance with capacitance standards has been analyzed. A number of possible sources of error have been studied and experimentally examined in a constructed model of the combined bridge. The experimental results confirmed an ability to measure inductance in reference to capacitance with an accuracy up to 10 parts per million (ppm) in the frequency band 0.16-2 kHz.