摘要
提出了一种新的交流信号真有效值数字测量方法.交流信号被逐个周波地采样,而不必满足采样频率必须等于交流信号频率的整数倍或有理分数倍这一条件.通过程序先找出信号基频、采样点与过零点间的时段长,然后算出各周波的真有效值.分析表明在周波内测量点数为128时测量误差约为1×10-6,且随测量点数的增大而进一步减小.该方法提供了一种新的真有效值测量手段,具有测量过程简化、响应时间减少、可输出每个周波的真有效值等优点.
This paper presented a new digital scheme for measuring the true effective value of the ac signal. The ac signal can be sampled cycle by Cycle continuously without the requirement that the sampling frequency must be the integer or rational number times of the ac signal frequency. The algorithm found the fundamental frequency of the signal and the time intervals between the sampled data and the crossing points, and evaluated the true effective value for each cycle. The analysis showed the measurement error was of the order of 1×10-6 when the sampled points was 128 in a cycle, and decreased as the sampled points increased. The scheme provided a new technique for true effective value measurements with simplified measurement process, shorter response time and cycle-by-cycle measurement output.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2006年第2期51-54,共4页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
关键词
数字测量
真有效值
整周期采样
digital measurement
true effective value
synchronous sampling
