Automated method for determining total harmonic distortion

Details Automated method for determining total harmonic distortion Automated method for determining total harmonic distortion

1989-04-06

1990-04-17

Tokar, Michael J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Analysis of complex waves

324 77R, G01R 2316

Patent

active

049183818

ABSTRACT:
The accuracy of an automated THD measurement performed by an FFT signal analyzer is improved by refining the estimate of the signal's fundamental frequency on which the THD analysis is based. This refinement is accomplished by calculating a parameter that represents the relative accuracy of the estimate and then varying the estimate to maximize the parameter. The result is a process which permits refinement of the fundamental frequency to an almost arbitrary accuracy, resulting in a highly improved measurement of THD.

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