利用超高速硬件描述语言(VHDL)在现场可编程逻辑门阵列(FPGA)上编程实现的纯数字式等精度频率计，不但具有较高的测量精度，而且其测量精度不会随着被测信号频率的降低而下降。为了实现对任意信号进行频率测量，在前端输入加整形电路即可。-The cymoneter that be implemented with using the VHDL (Very High Speed Integrated Hardware Descr iption Language) to program into the FPGA (Field Programmable Gate Array )chip，it not only has high precision，but also its precision do not decrease with measured-frequency’ s becoming lower. In order to measure any signal，it put a reshaping circuit at the front-end.