Reference standard for harmonics and nonsinusoidal power measurements

In this study, the method for the measurement of harmonics amplitudes and power at nonsinusodial signal, which utilizes two synchronized high precision digital voltmeters (DVM) has been developed. The harmonics of voltage and current waveforms were computed from the acquired digitized samples and compared the values obtained from thermal converters. The developed software which is based on FFT algorithm computes harmonics amplitudes and power less than 100 ppm. The system can be used as a reference system to calibrate harmonic analyzers at the power frequencies.