Measurement of very low dielectric losses at radio frequencies

Abstract
An absolute method is described for the measurement of very low power factors (below 0.0002) to an accuracy of 0.000003 or 4%, whichever is the greater. Modifications to the apparatus of Hartshorn and Ward are described whereby this resolution is achieved. The experimental technique may be used with conventional 53 mm-disc samples or with a liquid-cell-electrode system. Sources and magnitudes of absolute and experimental error are discussed, and fundamental comparisons are made with the Q meter method of power-factor measurement.

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