FIELD: electrical engineering. SUBSTANCE: input value is converted to digital signal. Adaptive filter is tuned to suppress the above-indicated signal. Inherent frequencies of adaptive filter are determined, and mains frequency is selected from them. Novelty is in use of iteration procedure of mains frequency measurement which consists in preliminary suppression of signal higher harmonics of frequency which was measured earlier and in subsequent measurement of frequency. Initial value of frequency is taken equal to nominal one. EFFECT: higher measurement results. 3 dwg, 1 tbl
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