Abstract
A simple impedance bridge, and auxiliary apparatus, is described for the measurement of total harmonic content of an alternating electric current. Total harmonic content is defined as the ratio of the square root of the sum of the squares of the harmonic amplitudes to the amplitude of the fundamental. This quantity is determined, using this method, by a simple comparison of two resistances. The bridge may also be used conveniently for the determination of the amplitude of large individual harmonics of low order. Details are given showing the extent of its usefulness in this field and the way in which it should be manipulated.
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