Patent ID: 6677577
Filing Date: 2004-01-13
Classification: G01R

Abstract:
A waveform measuring method for generating a sampling signal that has a cycle longer than a repetition cycle of a signal under test outputted from a signal under test generator from a sampling signal generator circuit, sampling the signal under test by means of the sampling signal, and obtaining an enveloped waveform of the signal under test, thereby obtaining a signal waveform of the signal under test, comprising the steps of:applying a common reference signal from the same reference signal generating portion to a reference signal input terminal of the signal under test generator and a reference signal input terminal of a sampling signal generator circuit; setting to the sampling signal generator circuit a sampling frequency having a repetition frequency specified from a sampling frequency setting portion such that a desired delay time can be obtained relevant to a phase of the signal under test; and generating the sampling signal having a cycle that corresponds to the sampling frequency based on the common reference signal and the sampling frequency in the sampling signal generator circuit and the repetition frequency specified from the sampling frequency setting portion, wherein a repetition cycle of the signal under test and a repetition cycle of the sampling signal are set based on a repetition cycle of the common reference signal so that the repetition cycle of the sampling signal can be set arbitrarily and independently of the repetition cycle of the signal under test.