Timebase Offset Calibration of Analog-To-Digital Converters for Mains Frequency Measurement

Abstract

The timebase inaccuracy of an Analog-to-Digital Converter (ADC) is an important systemic error to consider when it comes to fast and precise mains frequency measurement. In this paper, a new calibration method to determine the timebase offset of an ADC in real time to correct the mains frequency measurement is proposed and evaluated in tests. The methods uncertainty with regard to different calibration signal frequencies is assessed.