运用等精度测量原理,结合单片机技术设计了一种数字式频率计,由干采用了屏蔽驱动电路及数字均值滤波等技术措施,因而能在较宽的频率范围和幅度范围内对频率、周期、脉宽、占空比等参数进行测量并可通过调整闸门时间预置测量精度。-The use of other precision measuring principle in combination with single chip technology to design a digital frequency meter, shielded from the dry drive circuit and the use of digital technical measures such as mean filtering, and thus a wide range of frequencies in the range of frequency and amplitude, period, pulse width, duty cycle and other parameters were measured and can be preset by adjusting the gate time of measurement accuracy.