该函数基于的IEC 61000-4-7标准，计算谐波谱值，需要10分钟测量电压和电流信号，对平均值每10期的测量信号进行谐波分析。-IEC 61000-4-7 standard is based on the function to calculate the value of the harmonic spectrum, takes 10 minutes to measure voltage and current signals, the average of every 10 of the