With the unceasing development of electronic information industry, the measurement of the signal frequency is playing a significant role in theory study and practical application. In the project of electronic technology, frequency, which has great relation with the measurement methods and its measurement results, is one of the most basic parameters. Therefore, the measurement of frequency shows great importance. Among thousands of ways to measure frequency, electronic counter is taken as one of the best because of high precision, low time-cost, convenience, and automatic process. In this thesis, SCM was selected to make a digital frequency counter; meanwhile, direct measurement is taken in practice. Use the time-based gating signal created by time-delay to control the strobe. Compute the frequency with the help of the number of pulses recorded by the counter in specific time, then screen the result on the LCD. In this way, not only can my design reach the goal of my graduation thesis, but also it has stability and maturity.
