Frequency is the reciprocal of the signal cycle, which means the number of cycles completed per unit time of the signal. Generally, one second is taken as the basic unit time.

There are many methods for measuring frequency, including passive frequency measurement, comparison method, oscilloscope method, and counting method according to their working principles. The counting method is essentially a comparative method, and the most commonly used method is the electronic counter method. Electronic counter is the most common and basic digital measuring instrument.

Directly count the number of pulses of the measured signal per unit time, and then display the frequency value in digital form. This method has high measurement accuracy and speed, and is suitable for frequency measurement with different frequencies and accuracy. There are two ways to measure frequency with an electronic counter: one is a direct frequency measurement method, which measures the number of pulses of the measured signal within a certain gate time; The second method is indirect frequency measurement, such as periodic frequency measurement.

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