In software algorithm, the Blackman window on FFT algorithm is used on the data processed.The precision of system is enhanced greatly especially in the power factor measurement.

• 在软件算法方面，使用了FFT谱分析法,结合Blackman窗对采集信号进行数据处理,大大提高了测试准确度,尤其提高了功率因数的计算准确度。