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In engineering design and experiment, the frequency of square wave is often measured. At present, the commonly used method is the "time sluice" method, which is to measure the frequency of square wave by measuring the jump times of the rising or descending edge of the square wave in 1s. But if the frequency of the square wave is high enough, the processor is required to be fast enough. The high frequency signal is prone to error, so the precision is not high. In order to improve the accuracy, we can use the "pulse width" method to measure the frequency, that is to measure the width of the positive pulse width, and then calculate the frequency according to duty cycle. This method has high accuracy and short measurement time and high efficiency.

Research on the Method of Frequency Measurement Based on Pulse Width Measurement