说明：  基于FFT的测量推导单位以及labview的FFT模拟，. 在频谱单位表中，单击任意函数行的单位（直流）列或单位（频率> 0）列，验证频谱曲线组件与表格内公式的一致性。
(FFT-based measurement units, and FFT simulations for labviews. In the Spectrum Units table, click the Units (DC) column or Units (frequency> 0) column of any function line to verify the consistency of the spectral curve components with the formulas in the table )