The WZX-1 type microcomputer speed signal device is mainly used in various water turbine generator sets. It uses the residual pressure of the stator winding voltage transformer as the speed signal source, which is a component that reacts to the change of water turbine speed, and thus plays a protective role for the generator. Its main functions are: with speed indication signal display and various action outputs, device self-test, line monitoring, fault alarm, communication interface (RS-485), external WatchDog can make the device work reliably. The device adopts the standard CJ-4 shell, and the front cover is transparent plexiglass, which can clearly see the frequency change of the generator.