With the rapid development of computer technology and virtual instrument technology, virtual instruments are gradually becoming the development direction of the testing field. This article introduces the important method of driving ordinary data acquisition cards in the LabVIEW environment - the dynamic link library mechanism (DLL), and introduces a key technology and steps for using the Call Library Function (CLF) node provided by LabVIEW to call the dynamic link library (DLL) with specific examples, realizing the combination of LabVIEW and ordinary data acquisition cards, and enriching LabVIEW\'s control capabilities over hardware. Database technology is also applied to the virtual test system, and an Access database is established to realize data storage and automatic management, thereby expanding the functions of the virtual test system.
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