Digital frequency meter is a basic measuring instrument, which has a history of more than 30 years. In the early days, the goal pursued by designers was mainly to expand the measurement range, and to improve the measurement accuracy and stability. These are also the main basis for people to measure the technical level of digital frequency meters and determine the price of digital frequency meters. At present, these basic technologies are becoming more and more perfect and mature. The application of modern technology can easily extend the upper limit of the frequency measurement of digital frequency meters to the microwave frequency band. With the development of science and technology, users have also put forward new requirements for digital frequency meters. For low-end products, it is required to be easy to use and operate, with a wide range (enough), high reliability and low price. For mid-to-high-end products, high resolution, high accuracy, high stability and high measurement rate are required; in addition to the functions of general-purpose frequency meters, data processing functions, statistical analysis functions, time domain analysis functions, etc., or other functions such as voltage measurement are required. Some of these requirements have been achieved or partially achieved, but to truly achieve these goals perfectly, there is still a lot of work to be done for manufacturers, rather than the seemingly complete development. With the rapid development of digital integrated circuit technology, digital frequency measuring instruments made using the counting principle have a series of outstanding features such as high accuracy, wide measurement range, and easy automation of the measurement process.
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