The general counter mainly includes frequency, cycle and time interval measurement, and the number of pulses in any time interval usually also includes frequency ratio and accumulative count function.

The general counter is a commonly used digital measuring instrument for measuring the frequency of the measured signal. The measured signals can be signals of Fang Bo, sine wave or other periodic changes. It can also be called an intelligent counter. It uses decimal digit to display the frequency table of the measured signal. It is widely used in aerospace, aviation, electronic technology, measurement and control technology fields.

The general counter is a kind of electronic counter with many measuring functions and various uses. It can measure frequency, cycle, time interval, frequency ratio, accumulating count, timing and so on. It can also measure the phase, voltage and so on. It requires that the verification period is not more than one year.

For the verification of general counters, based on the requirements of many units or the development requirements, we need to build a complete set of universal counter verification system. Based on the hardware equipment, we have developed a verification software combined with the use.

The basic principle of the universal counter is to use a standard frequency signal source with high frequency stability as the reference clock, and to measure the frequency of other signals. 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 general counter has the "multiple parallel counting method": Based on multi-channel parallel processing capability, fast computation speed, low cost and high integration FPGA, it uses multiplex different frequency reference signals to count; absolute error can only be 1, and the highest accuracy count result is selected. When implemented, a high-speed comparator module is built by using a wideband amplifier and a high-speed comparator. The FPGA is used as the frequency measuring module. The control module is composed of single chip microcomputer, LCD display screen and keyboard, and the Verilog parallel programming is used to realize the "multi channel parallel counting method". It is expected to achieve high precision measurement of the frequency of 1 Hz to 199M Hz sinusoidal signal, and realize the time interval measurement of the other signal and the duty cycle measurement of the pulse signal.

The SYN5636 type digital frequency meter is used as the advanced domestic frequency meter. Because of its complete functions, better performance indicators, high accuracy and sensitivity, wide measuring range, it has won a good reputation. It is especially suitable for time and frequency measurement in the fields of research and Metrology such as aerospace, missiles, weapons and other fields such as time measurement and crystal oscillator, electronic components and so on.

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