摘要
研究了非正弦波交流电信号的采样测量方法,分析了同步误差的两个主要来源。采用同步误差补偿法,并结合三点法,实时跟踪信号频率变化并调整采样周期,较好地解决频率变化时采样不同步以及测量精度下降的问题;采用步进采样法来扩宽测量信号的频率范围;讨论了无外部采样保持器时的采样时序。设计了以16位超低功耗单片机MSP430F449为微处理器的硬件系统。实验结果证明本设计能有效提高软件同步采样测量精度。
The paper studies sampling measurement of AC signal of non-sinusoidal waveforms analyzes the two sources of the synchronization error, use synchronization error compensation and with three points method, the problems of nonsynchronous sample when signal frequency changes and the measure accuracy fall off can be solve better by the improved measures; using step wise sampling to widen the frequency of measurement; The sampling way without S/H are also discussed. The improved measures are simple to calculate and easy to carry out in the software design. The result shows the measure accuracy can be improved effectively.
出处
《电测与仪表》
北大核心
2007年第3期13-16,21,共5页
Electrical Measurement & Instrumentation
关键词
非正弦波
交流采样
同步误差
MSP430
non-sinusoidal waveforms
AC sampling
synchronization error
MSP430
