Research On Automatic Test System Based On Virtual Instrument

The technology of virtual instrument, as one of important parts of information technology, has great value to technical study and has good prospects for application. It breaks through the limits of traditional technology in such fields as data acquisition, data processing, data displaying and data storage. So, how to take advantage of it and develop it better deserves careful study.Virtual instrument results of technology of modern measuring combined deeply with the technology of computer. Automatic test system based on virtual instrument, which helps complete automatic test system with data acquisition, data processing and showing, result storing in real time automatically, is explained in this paper. Virtual instrument provides a very good platform for implementing automatic test system. The automatic test system we designed can be suitable for all kinds of automatic test systems with characteristic of high precision in data acquisition,friendly interface between operator and test systems and steady operation.At first, several kinds of virtual instruments are evaluated in this paper and the merits of virtual instruments are also analyzed compared to traditional instruments after giving a brief introduction to the present situation and development of virtual instrument at home and abroad. Then, the software structure and model of virtual instrument is analyzed, the I/O interface software of virtual instrument is presented and the principle of designing drivers of virtual instrument is summarized.According to the analysis of the first five chapters, the designing of system structure and hardware structure is given in this paper. In this paper emphasis is given on the software designing and implementing under programming environment of LabVIEW. The circuits of measuring and controlling are designed and implemented. The application software including interfaces and measuring modules of preprocessing devices is fully developed. Additionally, the problem of developing systems of databases and implementing report generating using ActiveX technology is analyzed and solved in this paper.