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In electronic technology, the frequency is one of the most basic parameters, and the Senate, and many of the measurement, the measurement results have very close relations, so the frequency of measurements, it is much more important. Measuring the frequency of a number of means, including electronic counter measure the frequency with high precision, ease of use, rapid measurement, and to facilitate realization of the advantages of full automation of measurement, frequency measurement is one of the important means. Electronic counter measuring frequency in two ways: First, direct measurement of the frequency, or within a certain time gates measuring the number of detected signals in pulses; Second, the frequency of indirect measurement, such as measuring the frequency of cycles. Direct Frequency Measurement Law is applicable to high-frequency signals in the frequency of measurements, indirect Frequency Measurement Law is applicable to low-frequency signals in the frequency of measurement.
In digital circuits, digital frequency of a timing circuit, it is mainly by the memory of a flip-flop. In the computer and digital instrumentation, have been widely used. CMOS circuitry in the series, the number of frequency of usage is greatest, many varieties of products, computers, communications equipment, audio and video, and other areas of scientific research and production of an indispensable instrument, and with many parameters, the measurement programme, the measurement results are Very close relationship, therefore, the frequency of measurement becomes more important.
Is a digital frequency of use decimal figures show that the number of measured frequency - measuring instruments. Under normal circumstances, the use of oscilloscope measurements can be roughly measured the frequency signal, accurate measurement of digital frequency is used. Its basic function is to measure the sine signal, square-wave signals, a sharp pulse of time and various other units within the physical changes, it uses a very wide range.

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