The System Of Data Acquisition On Virtual Instrument

Virtual Instrument(VI) is a newly delevoped instrument system.The user can define and design their one VI according to the application with the help of computer.With the VI,the user can develop many kinds of instrument with some basic hardwares and programming technologies.The main work of this paper is studying the Data Acquisition System(DAC) by means of the VI technology,USB bus technology,Monitor technology and some knowledge of hardwares.The VI programming environment is a project application software with powerful function.The USB is plug and play and very convenient. In this paper,the DAC has been finished that unites the respective merit of the technologies given.During the studying,we have finish the circuit board,the USB firmware programme and the VI application programme.And many technologies such as analog circuit,digital circuit USB technology and PROTEL are involved in the studying process.The programme is written by the C,VC++ and Lab VIEW. The VI studied in the paper has been used in the Performance Monitoring System of Local-blower finally. After debugging in the Performance Monitoring System of Local-blower ,we have developed the Data Acquiring System based on the VI.On the bases of the DAC,we can make up more agility measuring instrument by extending the hardware and the software.Then we can monitoring many other signals according to the practice applications.