本频率计采用数据选择器实现对任意周期信号的频率、周期、脉宽、占空比、自检等不同功能输入电路的选择，通过键盘实现了各个功能的选择，最后采用LED动态显示模块将所测的数值显示出来。-The frequency meter data selector realize periodic signal of arbitrary frequency, period, pulse width, duty cycle, different functions such as self-selection of input circuit, through the keyboard to achieve the various functions of the choice of the final adoption of LED dynamic display module will be The measured value is displayed.