Digital frequency meter is an instrument for measuring the frequency of periodically changing signals by digital circuit technology. The digital frequency meter is a digital measuring instrument that displays the result of digital counting. It is a digital measuring instrument, and the digital frequency meter can be used to measure the frequency value of periodic signals such as sine wave, rectangle wave, triangle wave and sharp pulse, and also can measure the period and pulse width of signals. The digital frequency meter is also one of the counters.

As a digital measuring instrument, digital frequency meter has the advantages of high frequency accuracy, intuitive display, fast measurement, simple operation and digital display. In addition to the above advantages, the SYN5636 type general counter is a time-frequency testing instrument developed and designed according to the verification regulation of general counters. In addition to the above advantages, the SYN5636 type general purpose counter has the following advantages. The basic parameter of the general counter is the measuring frequency 100MHz ~ 6GHz. The frequency resolution is 11 bits / sec, the period measurement is 5ns to 1000s, the phase measurement is 0~360 degrees, and the time interval is measured by 0-10000s. The SYN5636 universal counter is equipped with the temperature compensated crystal oscillator as the internal time base standard, and can also be used for external reference of 10MHz sine wave. The above parameters of the general counter meet the requirements of the verification regulation, and also satisfy the actual production and testing applications.

The main indicators of digital frequency meter are measuring range, measuring function, accuracy and stability. The function extension of frequency meter is the function of modulation domain analyzer. The digital frequency meter can directly display the frequency value of the counting unit in the specified number of pulses in the specified time. The working principle, such as the SYN5636 general counter, uses the appropriate logic circuit to accumulate the oscillation times of the input signal in the specified time, or to accumulate the standard time signal in the time interval to be measured, and then to measure the frequency cycle and the time interval.

The digital frequency meter has high accuracy and speed, and is suitable for frequency measurement with different frequency and accuracy. The digital frequency meter can be used in different places. At present, the digital frequency meter produced by our company has SYN5635 low cost general counter and SYN5636 type general counter. The difference lies in the specific measuring parameters such as range, accuracy, resolution, measurement speed, etc., which can be selected by many different users.

With the improvement of the function of the SYN5636 general counter, it can measure many physical quantities, such as temperature, pressure, flow, liquid level, pH, vibration, displacement, speed, etc., and the counter is transformed into signal frequency through sensor. Nowadays, the SYN5636 general counter has been applied to aerospace, electronic technology, scientific research and metrology, industrial production, weapons, missiles and other fields. It is used to measure the time and frequency of crystal oscillator, electronic components and other devices.

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