JITTER RESISTANCE MEASURING INSTRUMENT AND METHOD FOR ENABLING EFFICIENT MEASUREMENT OF JITTER RESISTANCE CHARACTERISTIC AND ADEQUATE EVALUATION

A control section varies an amplitude of a modulation signal every time the control section conducts control to vary a combination of the frequency of a clock signal and the frequency of the modulation signal by controlling a clock signal generator and a modulation signal generator, and derives a value indicating jitter tolerance of a measurement subject based on a decision result on an error of a data signal having a predetermined pattern output from the measurement subject and information of the amplitude of the modulation signal. A display section receives information concerning the frequency of the clock signal, the frequency of the modulation signal, and the amplitude of the modulation signal, and the value indicating jitter tolerance, and displays jitter tolerance characteristics of the measurement subject simultaneously on a screen by using the frequency of the clock signal and the frequency of the modulation signal as two parameters.