Design And Realization On The Teaching Testing System Of Virtual Instrumets Based On LabVIEW

It is very important for experiment teaching in the entire teaching of high engineering institutions, but, in a long period of time, the backward teaching instrument and teaching method have restricted the improvment of teaching quality in large degree. The purpose of this thesis is to build a teaching testing system of virtual instruments, which can be severed to experiment teaching of high engineering institutions, and upgrade its teaching level and improve its teaching quality.In the process of building this system, we need two side's conditions: on one hand, we must understand the idea of virtual instrument and have a good engineering workbench. For this reason, we use labVIEW (Laboratory Virtual Instrument Engineering Workbench) of National Instrument Company, which is prevalent, as our engineering workbench. Because this, we introduce many applications of virtual instrument and LabVIEW. In this paper , we also introduce and analyze Bus construction of virtual instruments , which are PC-DAQ/PCI, GPIB, VXI, PXI and serial interface. On this basis, we select Lab-PC-1200 of National instrument Company as our hardware workbench and configure it. On the other hand, we must master the theory of signal analyzing and handling, and the technology of engineering measuring, so we elaborate the basic theory knowledge that we use in the process as theory foundation of building this system.The nucleus is the software in the design and realization of virtual instruments. We use the design method of module and use many papers to describe the whole building process of the typical signal generation module, date handling module, date reading and writing module, resultdemonstrate module. As the conclusions, we also offer the panels and the diagrams of virtual signal frequency spectrum analytical instrument, virtual Butterworth filter, virtual signal generation instrument, virtual integrator and differentiator regulator and amplitude modulation wave counter modulation instrument. These virtual instruments , which are composed of the teaching testing system , can be used to basic experiment teaching courses, for instance circuit theory , electronic technical basis , signal and system engineering , automation control theory.