Method for AC current measurement based on digital sampling technology

According to the problem of high cost of standard apparatuses and complex operating for the traditional AC current measurement, this paper introduces a method to measure the AC current with high performance which is based on using digitizing system and the AC-DC difference calculable resistance. Compared verification tests indicate a maximum deviation of 2.3 × 10
^-5
between the digital sampling measurement system and the traditional method in the typical frequency range of 40Hz to 10kHz, which achieves the equivalent technical specification. Meanwhile, it can provide a more reliable and simpler way for AC current calibration.