The Design Of Virtual Harmonic Analyser Based On LabView

With the advancement of science and technology, the development of measurement technique is getting more and more important. The application of electronic measurement technique has extended to more fields than ever. Due to limited functions and big size, traditional electronic measurement equipment is no longer suited for common purposes. Thanks to the rapid development of integrated circuit and computer technology, measurement instruments are becoming digitized and intelligentized. Compared with traditional equipment, the new instruments have more functions, higher processing speed, wider bandwidth, friendlier interface,smaller size and better expandability. The prevalence and rocketing development of personal computers give birth to a new kind of instrument, Virtual Instrument (VI). VI is based on PC platform, and can make use of the software and hardware resources of a PC. Compared with its ability of data processing and flexibility, VI has a low price, which means it is a good choice for research and teaching reform in universities. This dissertation discusses the implementation of a signal acquisition system, based on the concept of VI. With a self-developed data acquisition card connected to PC, a digital storage oscillograph (DSO) with the function of cymometer and spectrum analyzer is developed.LabVIEW is the innovate software of national instruments corps, of America.lt is also the most widely used> the most quickly developing and the strongest function gragh software.lt has short epolder and fast run-rate.So Lab View is the best way of design virtual digital storage oscillogragh. This dissertation focuses on key techniques in data transmission, display and processing. Virtual digital-storage oscillograph is the real application of virtual instrument...