Based On The Gpib Interface Bus Distributed Automatic Test System Development And Applications

At present, General Purpose Interface Bus (GPIB) is very popular in establishing Automatic Test System. It integrates virtual instrument technology, computer theory and powerful testing apparatus. Automatic test technique has been widely applied to many testing fields, due to its rapid testing speed, high accuracy, powerful functions and good expandability. This dissertation researched the application of distributed automatic testing technology in the ship electric propulsion system. Automatic test technology and network communication technique were applied into the ship's real-time monitoring system, to measure and record all kinds of parameters of the ship electric propulsion simulation equipments.By building a distributed automatic test system based on GPIB, this article introduced the communication principle of GPIB, emphasized in the implementation of IEEE—488/IEEE—488.2 communication protocol in VB environment, and presented the development method and structure of the automatic test system. A computer links several programmable instruments by GPIB bus, forming a lower layer network. The computer runs testing software, remote controls the measuring instruments to achieve some testing processes on the ship's electric network, including power parameters' measuring, acquisition, filtering, and error analysis. These different kinds of data can be saved in the Access database. Then the computer connects with other client computers through LAN, building up an upper layer network based on TCP/IP, achieving instruments' remote control and distributed measuring. The instruments, computers and networks compose a distributed automatic test system, which offers performance of sharing the instruments.To analyze the measured data off-line, the system can save the real-time data in the database. This involved in the establishing,linking and accessing to Access Relational Data Base Management System in VB development environment, remote accessing to the Client/Server distributed database, and transaction processing in the database.The paper also focused on the implementation approach of system's...