An Alternating-Current Apparatus for Measuring Dielectric Constants

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Abstract
A heterodyne beat apparatus operating on alternating current is described. The essential features are: (1) a crystal controlled oscillator, (2) a variable capacitance oscillator, and (3) the power supply. By properly choosing plate potentials and by using a line voltage stabilizer the effects of normal voltage variations have been essentially eliminated. The frequency stability is found to be quite good, and the time of warm‐up rather short. Especial care was given to rigidity of mountings, and to thermostating of both oscillators. Circuit details are shown in figures.