Resonant capacitance-inductance transfer using the ratio transformer

The application of resonance techniques to the ratio transformer bridge is described. The capacitance-to-inductance transfer thus achieved makes it possible to refer all audio-frequency reactance standards to one group of standard capacitors. Basic theory and alternate bridge balancing techniques are discussed. Significant sources of error are analyzed, and praceical numerical limits given. Experimental results are correlated with National Bureau of Standards (NBS) measurements. These results show a series resonance transfer accuracy better than 50 parts per million.