TESTING INSTRUMENT, MEASURING INSTRUMENT, AND ELECTRONIC DEVICE

摘要

PROBLEM TO BE SOLVED: To solve the problem that, when a jitter is measured using a time interval analyzer or the like, measurement cost will increase, and when an analysis signal is used, computation of measured data becomes troublesome, and to make it possible to easily measure jitter of measured signal.;SOLUTION: A testing instrument for determining whether or not measured signals are appropriate includes a frequency counter for repeating plural times a counting step of counting the number of pulses of a reference signal the cycle of which is known, and the number of pulses of the measured signals in parallel within the identical measurement period of time, an average period calculation unit for calculating average periods of the measured signals in the measurement period of time for respective counting steps, based on a ratio of the number of pulses of the reference signal to the number of pulses of the measured signals counted within the identical measurement period of time, and a frequency of the reference signal, a noise calculation unit for calculating dispersion of the average periods calculated by the average period calculation unit, and a determination unit for determining whether or not the measured signals are appropriate, based on the dispersion of the average periods.;COPYRIGHT: (C)2011,JPO&INPIT