Differential absolute equalization measurement circuit

Digital phase detector

Digital phase detector

Digital phase detector employing a digitally controllable delay

Digital phase difference detecting circuit

Digital phase measurement method

Digital phase meter apparatus

Digital phase meter circuit

Digital tracking phase meter

Direct phase and frequency demodulation

Direct phase digitization

Direction sensing system for an AC power supply and AC motor dri

Electrical apparatus for detecting relationships in three phase

Electrical phase checking apparatus and method of metering

Electronic device for the measurement of time lags

Electronic instrument for measuring the overall phase and amplit

Electronic metering device including automatic service sensing

Electronic phase sequence indicator for three-phase electric sys

Filter, phase-measuring device and method for application of sai

Frequency measurement using phase continuous frequency switching