The function of frequency counter is designed according to its application. The most common application of the frequency counter is to determine the characteristics of the transmitter and receiver. The frequency of the transmitter must be inspected and calibrated to meet the requirements of the relevant rules and regulations.

Other applications of the frequency counter, including the computer field, use a high performance clock in the data communications, microprocessors, and displays in this field. The application areas with low performance requirements are included in the measurement of mechanical and electrical products. One of the early applications of the frequency counter is used as part of the signal generator.