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The authors have recently developed a number of instruments for measuring harmonic composition of power grid signals. These instruments have a simple, predominantly digital architecture and they are based on an assumption that the frequency of the measured signals equals its nominal value (50 Hz, 60 Hz or 400 Hz). This approach has enabled the measurement of a high number of harmonics within a single period. However, the internal oscillator in the instrument generates the nominal frequency and cannot adapt to frequency changes in the input signal. This paper presents a method for the improvement of the operation of the developed instruments in cases when the fundamental frequency drifts from its nominal value as is the case with real power grid signals. Based on this method, modified versions of the harmonic measurement instruments have been developed. A comparison of the measurement error with and without the application of the proposed method is presented in the paper.

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A phase angle standard for power frequencies (40-400 Hz) with a very low measuring uncertainty of 3 µrad is developed. The standard is based on a two-channel high-stability arbitrary waveform AC source for voltages up to 120 V and currents up to 6 A with high phase angle resolution which is realized as a development device with full computer control. A proper auto-calibration method is implemented for achieving ultimate performance in phase angle accuracy. The high performance of the phase angle standard is thoroughly evaluated and presented briefly.

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