The Study Of Virtual Instrument Technology

With the development of science and technology, the requirement on measurement technology is getting more and more important. The application of electronic measurement technology has extended to more fields than before. Due to limited functions and big size, traditional electronic measuring equipments are no longer suitable to common purposes. The rapid development of integrated circuit and computer technology gives birth to a new kind of instrument, Virtual Instrument (VI). As a result, the testing cost increases by a wide margin. In recently years, a new measure technology that combines the technology of electron, technology of computer, technology of network, is developed and this new technology is named VI. Especially various measuring instruments based on computer,they are more widely used because of their excellence such as:lower cost,easily used,etc。It is based on PC platform,which make it convenient to use the software and hardware resources of PC and get the ability of data processing flexible.With VI,a measure system can be easily builded for different requirements.Actually,virtual instrument is an automatic measuring and testing instrumentation system based on computer. As the integration of computer technology and modern instrument technology, virtual instrument makes the revolutionary breakthrough in the measuring theory and technique of the conventional instrument. Virtual digital oscilloscope system includes signal acquisition, signal processing and output display. The signal acquisition is completed by hardware, the other are realized by software. Virtual digital oscilloscope we designed consist data acquisition, wave display, frequency spectrum and wave storage modules. It has some merits which common oscilloscope doesn't have, such as saving wave as permanence data,using data at any moment,real-time display and print wave,cost low,extending functions based on requirement of application. LabVIEW is the innovate software of National Instruments Corps .of America. It is also the most widely used , the most quickly developing and the strongest function graph software. It has short empolder and fast run-rate. So LabVIEW is the best way of design virtual digital oscilloscope.