Study of a New Algorithm of Digital Wattmeter Calibration

According to the characteristics of the digital meter which is widely used in the power supply system,an algorithms of calibration based on the digital all-pass phase-shifting filter is proposed to solve the problems of the traditional method,involving the high measuring complexity,bad real-time performance and inapplicability in embedded measuring device.The algorithm of digital meter calibration studied in the paper mainly refers to two aspects-the standard digital power source calibration and the calibration of the whole calibration device.Considering the measurement uncertainty,the standard uncertainty of input amount and the uncertainty of synthetic standard are assessed to verify the effectiveness of the proposed algorithm.