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Definition of "Total Harmonic Distortion" |
[THD] Of a signal, the ratio of the sum of the powers of all harmonic frequencies above the fundamental frequency to the power of the fundamental frequency. The measure of closeness in shape between a waveform and its fundamental component. The ratio, expressed in percent, of the RMS voltage of all harmonics present in the output to the total RMS voltage of the output for a pure sine wave input. The RMS voltages are measured at an output terminal with respect to ground. |
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