Measurement of Absolute Phase Error of Digitizers

Some engineering applications, such as Phasor Measurement Unit and calibration of instrument transformers with digital output, require the knowledge of phase error of digitizers, to reach high phase measurement accuracy. This paper proposes a method for the measurement of digitizer absolute phase errors. The technique is based on the characterization of generator phase response and on the measurement of the time delay between the digitizer sampling clock and a phase reference signal. Taking into account the phase deviation introduced by generation system and the clock delay it is possible to accurately evaluate the digitizer absolute phase error