Frequency measurement is usually implement by accounting the measured signals and standard signals, thus quantizing error becomes the main source of measuring error.
频率测量一般是通过对被测信号和标准信号计数实现，因此量化误差是引起测量误差的主要原因。
The principle of equivalent accuracy measuring frequency, implement circuit and part of testing programs are introduced.
文章介绍了等精度测频原理，实现电路及部分测试程序流程。
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