1_KHz_HARMONIC_DISTORTION_METER

Published:2009/6/17 22:14:00 Author:May | From:SeekIC

The circuit useful for distortion measurements notches out the fundamental frequency of 1 kHz to allow measurement of the residual level of harmonics. First a true BMS meter is used to measure the 1-kHz input level Ein by setting SA to the input position. Then, SA is placed in the distortion posi-tion and the 2 k potentiometer is adjusted for a null. The residual reading is noted. The THD is then calculated based on the formula:



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