This paper introduces a computer-based multi-channel signal acquisition, real-time display and alarm system. Since the system uses computers and data acquisition cards as basic hardware to complete various instrument functions, it belongs to the category of virtual instruments. Virtual instruments are the development direction of modern measurement and testing instruments, and the software system is the core of virtual instruments. The advantage of virtual instrument technology is that users can define their own special instrument systems, and the functions are flexible and easy to build, so their applications are becoming more and more extensive. This paper introduces a sensor signal measurement and alarm system based on virtual instrument technology, gives its hardware composition, and the design method and advantages of using VC++ as the software development language. Keywords virtual instrument VC++ data acquisition card dynamic link
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