Rotary peed-measuring and frequency outputting device

The invention relates to a tachometric survey and frequency output device, belonging to the technical field of instruments and meters. The device mainly comprises a rotating speed signal processing circuit, a rotating speed signal frequency conversion output circuit, a parameter setting input circuit, a rotating speed and parameter display circuit, an instantaneous rotating speed data storage circuit and a control unit; all the circuits are electrically connected with each other, and an Atmega128L microcontroller with high performance and low power consumption is used for measuring, displaying and storing the rotating speed and outputting a frequency conversion signal. The device not only has the basic function of a common revolution meter, but also is added with the function that the rotating signal is output with frequency conversion, meets the requirement that different frequency rotating speed signals are needed under the same rotating speed signal, thus reducing the hardware costand having convenient ope