Patent ID: 8635040

Claim:
A signal measuring device, comprising: one set, or a plurality of sets, of measuring unit(s) measuring an object of measurement in synch with a driving clock signal for measurement and outputting a result of the measurement as first data, and a timing identification unit which, in accordance with a measurement-start command, outputs a value, which differs every period, as second data in synch with a reference signal having a prescribed period and a speed lower than that of the driving clock signal; and a storage unit collecting and successively storing the first data and the second data as one set in synch with the driving clock signal, wherein the reference signal is a different signal than the driving clock signal, the reference signal not being used for measuring the object of measurement, wherein the signal measuring device further comprises: a digital-to-analog converter reading out the first data successively in order of decreasing age in terms of storage in said storage unit, and converting the first data to an analog value; and a timing generator operating said digital-to-analog converter at a longer period than a period of the reference signal.