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Design of the General Hardware Platform of Virtual Instrument Based on DAQ Data-Acquisition Card

ZHANG Jing,LU Feng-lan,YU Cheng-bo (1.Department of Mechanic Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710068,China; 2.Department of Electronic Engineering,Chongqing Institute of Technology,Chongqing 400050,China)  
This paper briefly introduces the basic concept and composition of virtual device, discusses the composition of the general hardware platform of virtual device, expatiates on the hardware-designing thoughts of PCI bus-based virtual oscillograph, and mainly introduces the design of signal-regulating circuit and data acquisition circuit.
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