Improved frequency measurement by means of DMM and verification of its specifications

A simple, but highly accurate, sampling method for the measurement of frequency by means of a digital multimeter (DMM) or a digital voltmeter (DVM) is explained both theoretically and from the applicative point of view. The mathematical background is given in short form, and comparison with other solutions is provided. High accuracy and behavior regarding random errors are foreseen by computer simulation and then proved in real laboratory measurements. Finally, verification of factory time-base specifications of sophisticated equipment is shown taking an HP 3458A DMM as an example device under test.