说明：  本系统基于TI公司的MSP430系列芯片，结合模拟电路实现市电频率、电压、电流以及电压和电流之间相位差的测量。通过对市电波形的采集，系统还完成有功功率、无功功率的计算以及波形频谱的分析。
(The system is based on TI' s MSP430 family of chips, combining analog circuit realization of the city of frequency, voltage, current and phase difference between voltage and current measurements. Waveform of the city' s collection, the system also completed active power, reactive power spectrum calculation and waveform analysis.)