该设计使用环境是proteus，附有仿真电路，及程序（c语言），对输入的脉冲进行测量，显示出频率值，测量范围0-350khz，误差为1hz-The design environment is the use of proteus, with circuit simulation, and procedures (c language) on the measured input pulse, showing that the frequency value, measuring range 0-