FIELD: measurement technology. SUBSTANCE: phase difference between two signals x(t), y(t) filtered off d.c. component having oscillation period T is measured by means of two instant values of one of signals assumed as measuring signal, these values being recorded at time intervals t1T/8 and t2 3T/8 selected at half-wave interval of other signal assumed as reference one using mathematical expression accuracy at low deviations from common mode or antiphase mode, reduced measurement error at infralow signal frequencies with amplitudes varying within comprehensive dynamic range. EFFECT: improved accuracy of measurements. 2 dwg
