Method for measuring frequency of signal under test involves measuring time of prescribed phase of signal under test and calculating slope of approximate line related to prescribed phase and measured time or reciprocal of slope as frequency

摘要

A time of a prescribed phase of the signal under test is measured; and a slope of an approximate line related to the prescribed phase and the measured time or the reciprocal of the slope is calculated as the frequency. The signal under test is compared to a reference level and the time of the prescribed phase of the comparison result is measured as the time of the prescribed phase of the signal under test. An independent claim for an apparatus for measuring the frequency of the signal under test.