The current digital frequency meter can accurately and quickly measure the signal frequency, and the digital frequency meter also has the advantage of quickly capturing the small object to be measured and the signal changes. Therefore, digital frequency meters are needed in many fields. In the production of large enterprises today, the frequency meter is used to test the production line. Digital frequency meter does not need too much time to measure the signal, so it can save time for enterprise production. It can measure the frequency of the crystal oscillator as quickly as possible,