基于CPLD／FPGA的可编程逻辑器件，借助单片机AT89C51；利用标准频率50～100MHz的周期信号实现系统计数的等精度测量技术。同时采用闸门测量技术完成脉宽,占空比的测量。-Based on CPLD/FPGA programmable logic devices, with single-chip microcomputer AT89C51　using a standard 50 ~ 100MHz frequency of the periodic signal, such as counting the realization of the system measurement accuracy. Measurement techniques used to complete the gate pulse width, duty cycle measurements.