Research on High Precision AC Voltage RMS Measurement Technology

In the field of high-precision instrument measurement and measurement system development, it is necessary to further improve the accuracy of digital multimeters. As one of the important functions of multimeter, the measurement accuracy of AC voltage RMS also needs to be further improved. In this paper, the high-precision AC voltage RMS measurement technology is studied. By using AC digital sampling, the uncertainty of AC voltage RMS measurement is 40ppm through the integration algorithm based on equivalent sampling and the sampling time base jitter error suppression based on zero-crossing detection. The experimental results show that the developed AC digital sampling system works stably and reliably, and can realize the measurement of high-precision AC voltage RMS.