Application In Electronic Experiment Teaching Of Virtual Instruments Based On LabVIEW

It is very important for teaching in the whole process of electronic experiments, but in a long time, the backward equipments and methods has largely restricted the improvement of quality. The purpose of this thesis is to build a virtual teaching test system, which can be severed to high engineering courses, and upgrade its level and improve its quality.To build this system, we must understand the idea of virtual instrument and have a powerful workbench. For this reason, I use LabVIEW (Laboratory Virtual Instrument Engineering Workbench) of National Instrument Company, which is prevalent, as my software workbench. So, I introduce many applications of virtual instrument and LabVIEW. I also introduce and analyze the bus of virtual instrument in this paper, which are PC-DAQ/PCI, GPIB, VXI, PXI and serial interface. On this basis, I select PCI-GPIB as my hardware workbench and configure it.The kernel in design and realization of virtual instrument is the software development. I use modular method and many papers to describe the whole building process, analyze and solve issues which come forth during the design and realization process. As the conclusion, I offer the theories, panels and diagrams of eight virtual instruments, such as virtual sine wave generator, autocorrelation function demonstrator, phase difference demonstrator based on phase method, virtual sine wave frequency spectrum analytical instrument, characteristic of Chebishev frequency demonstrator, virtual integrator and differentiator, virtual modulation and demodulation, virtual signal generator, and a example program which used in the practice. These virtual instruments form the teaching test system, which can be used in experimental courses, for example, circuit theory, electronic technical basis, signal and system, automation control theory and so on.Finally, the thesis discusses the imagination of internet virtual laboratory, concludes that the model of internet lab is the orientation of long-distance teaching, and shows its feasibility by a material example.