摘要
Abstract
In this paper,the true RMS algorithm for AC signal based on digital sampling arbitrary waveform is presented, with which the certain duration sample data is acquired by equal interval sampling,and then squaring is proceeded point⁃by⁃point. The digital low⁃pass filter was designed according to the lowest frequency component and accuracy requirements of AC sig⁃nal. The true RMS of AC signal is obtained by conducting low⁃pass filtering of signal sample square sequence and squaring filtering results. Simulation analysis and practical measured results show that the result from the algorithm is independent of waveform, and can meet the application requirements of random variation for frequency and waveform.关键词
数字测量/真有效值/整周期采样/低通滤波器Key words
digital measurement/true RMS/whole period sampling/low-pass filter分类
信息技术与安全科学
