FIELD: electrical engineering, systems testing level of lack of sinuosity of voltage and other devices for spectral analysis of values changing periodically. SUBSTANCE: method of quantitative evaluation of subharmonic and fractional higher harmonic components of values changing periodically makes it feasible to evaluate harmonic components of current and voltage which frequencies are not multiple of frequency of fundamental harmonic thanks to enlargement of integration limits with graphic and analytical decomposition of these periodically changing values. EFFECT: obtainment of quantitative evaluation of subharmonic and fractional higher harmonic components of values changing periodically. 1 dwg
