A wavelet-based method of measuring fluctuating harmonics for determining the filter time constant of IEC standard harmonic analyzers

Harmonic analyzers are used to test the fluctuating harmonic emissions of electrical appliances to international regulations. This paper describes a wavelet-based method of measuring level-changing harmonics (bursts) for use in the calibration of these analyzers. The method is shown to be reliable for measuring various mixtures of harmonics. The importance of calibrating harmonic analyzers under conditions of fluctuating harmonics is discussed.