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Information About

Total Harmonic Distortion





EXPLANATION


In most cases, the transfer function of a system is Linear And Time-invariant . When a signal passes through a non-linear device, additional content is added at the harmonics of the original frequencies. THD is a measurement of the extent of that distortion.

The measurement is most commonly the ratio of the sum of the Powers of all Harmonic frequencies ''above'' the Fundamental Frequency to the power of the fundamental:

:




A meaningful measurement must include the Bandwidth of measurement. This measurement includes effects from Intermodulation Distortion , Interference , and so on, instead of just harmonic distortion.


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