Parallel-Resonance Methods for Precise Measurements of High Impedances at Radio Frequencies and a Comparison with the Ordinary Series-Resonance Methods
- 1 December 1938
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in Proceedings of the IRE
- Vol. 26 (12) , 1466-1497
- https://doi.org/10.1109/JRPROC.1938.228188
Abstract
Two parallel-resonance methods are described which determine primarily the parallel conductance of a parallel-tuned circuit. They are most useful for measuring relatively low admittances (high impedances). Since they are duals of the reactance- and resistance-variation methods, they have been named the susceptance- and conductance-variation methods. These parallel-resonance methods are compared with the series-resonance methods with respect to range and possible sources of error. It is pointed out that, for substitution measurements, tight coupling to a constant-frequency power source need not introduce errors in measurements with either series- or parallel-resonance methods. The errors caused by residual inductance and metallic and dielectric loss in the standard condenser are discussed and numerical examples given. A precise method of interpreting resonance-curve data is presented. Experimental results are listed for measurements of high resistances by the susceptance-variation method.Keywords
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