| This paper first discussed some ways for rotary speed measure . It analyzed characters and errors of these ways.Second , it designed full digital measure system based on a Single-Chip Microprocessor(80c51)responding to special application , stated the working theory of the system and the methods to solve the errors, writed the working programmes by A51 assemble language.Finally, this system implementation was confirmed by using of Keil-51 simulator. The characters on the error margin and accuracy was summarized. |