Design And Realization Of Baterry Test System Base On Virtual Instrument

Virtual instrument technology is an important test technology integrating moderntest and computer techniques. It overcomes the restrictions of conventional technologyin data acquisition, processing, display and storage, and represents the developmenttrend of automatic test and electronic measurement instrument in the21stcentury。This paper intends to satisfy the actual demands of enterprises. It takes batteryonboard XX supersonic missile as object to develop a battery test system based onPC-DAQ hardware configuration of virtual instrument. This test system can achieveautomatic test of bridge and insulation resistance as well as conductivity of pyrotechnics,overcoming shortcomings of the original manual test method such as lower operationefficiency, greater measurement error and higher safety requirements. It adopts a newmethod in conductivity test: based on the feature of common potential betweenconducted resistors, a software-controlled8-bit digital I/O card is used to achieve a rapidand reliable conductivity test among288pins, greatly improving the test efficiency andreducing the memory. For insulation resistance test, the test system uses a single-chipmicrocomputer (SCM) to control automatically the sampling resistors switchover andthe gain of program-controlled amplifier, and applies filter technology to obtainhigh-precision test data. Its software uses ActiveX technology to achievecommunication between LabVIEW and Word, ensuring an inquiry of history data andreal-time output (print) of data sheets.The whole test system is designed around industrial-control unit (ICU) as control core. PCI bus, as basis of the system, is used to sample the multi-channel data betweendata acquisition card and system memory, as well as the control commands to I/Oswitching volume card. The system converts the non-electric signal into electric signalvia the signal converter. These electric signals are extracted and amplified after signalisolation, filtration and anti-conversion to satisfy the requirements for input voltage ofPCI－1713high-speed analog input card. The PCI-1713will convert the input analogvoltage to digital signals to be processed by ICU, which will control PCI to achieve datasampling, switching volume control and the calculation, analysis, display and judgmentof the measured data via the graphic program language LabVIEW environment.It is verified through tests that all test results meet requirements for the systemspecification, the automatic test system operates stably and reliably for long durationwith higher operation efficiency and lower human error, and the design objective isachieved.