Digital frequency meter is a commonly used digital display of the measured signal frequency measurement instrument. Digital frequency meter is an instrument for measuring the frequency of periodically changing signals by using digital circuit technology. The digital frequency meter displays the frequency of the measured signal in digital form. It is mainly used to measure the frequency value of the periodic signals such as frequency, period, time interval, sine wave, rectangle wave, triangle wave and sharp pulse.

With the development of science and technology, the digital frequency meter is also improving. The digital frequency meter has also replaced the oscilloscope and the spectrum analyzer to measure the frequency. Because the oscilloscope has low precision and large error while measuring the frequency, and the frequency measurement speed of the spectrometer is slow, so it can not track the frequency of the measured signal quickly. The digital frequency meter can quickly and accurately capture the change of the frequency of the measured signal. The digital frequency meter can directly display the frequency value of the pulse number of the measured signal in the specified time within the specified time. Digital frequency meter is easy to operate and widely used.

At present, Xi'an's synchronous digital cymometer SYN5636 high precision general counter has been used for time and frequency measurement in the fields of Aeronautics, missiles, weapons and other fields such as time measurement and crystal oscillator, electronic components and other scientific research and metrology. The SYN5636 type universal counter has the characteristics of wide frequency range, high accuracy, fast speed, many functions, simple operation, high sensitivity, wide dynamic range and external reference. The SYN5636 type high precision general counter measures frequency range 100MHz to 6GHz, frequency resolution 11 bits / sec, cycle measurement 5ns to 1000s, phase measurement 0~360 degrees, and time interval measurement 0-10000s. The counter is equipped with a temperature compensated crystal oscillator as the internal time base standard.

The SYN5636 type high precision general counter can measure many kinds of equipment. Its working principle is to accumulate the oscillating times of the input signal in the specified standard time by proper logic circuit, or to measure the number of standard time signals in the time interval to be measured, and to measure the frequency cycle and the time interval. Usually, the shorter the gate time, the faster the frequency of the measurement will be refreshed, but the frequency accuracy will be affected. Conversely, when the accuracy requirement of the frequency value is relatively high, the longer the gate time is, the longer the time will be, the more accurate the frequency will be, but the longer the interval corresponding to each measurement will be.

The SYN5636 type high precision general counter can directly count the pulse number of the measured signal in unit time, and then display the frequency value in digital form. This method has high accuracy and speed, and is suitable for frequency measurement with different frequency and accuracy. The SYN5636 type high precision general counter can measure the frequency value quickly and accurately. This measuring technology improves the work efficiency and reduces the error. It is the inevitable development of the digital frequency meter.

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