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  以CVI为平台，建立信号的频谱分析仪，有两个图形控件，用来分别显示采集波形和频谱分析图形；两个数字控件，一个输入采样速率，一个显示信号频率；三个命令控件，一个启动数据采集命令程序，一个开始频谱分析，一个退出程序。(CVI is the signal spectrum analyzer, two graphical controls, used to display the waveform acquisition and spectrum analysis graphics two digital controls, an input sampling rate, a display signal frequency three commands control, astart the data acquisition command procedure, a spectral analysis, an exit program.)