该vi 可对输入波形进行谐波成分分析 ，获取2-20次谐波成分，可测量直流分量、基波幅值、基波频率等参数，并具有THD越线警告功能(The VI can analyze the harmonic component of the input waveform, obtain 2-20 harmonic components, measure the parameters of the DC component, the amplitude of the fundamental wave, the frequency of the fundamental wave and so on, and have the THD line warning function.)