Design Of Virtual Oscillograph Based On High Speed Data-acquisition Card

The instrumentation industry is undergoing a variety of exciting changes as a result of the development of PCs, The PC revolution has equipped users with powerful processing and display capabilities of their own. The computer can enhance instrument functionality in any of the three areas-data acquisition, analysis, and presentation. Virtual instrument (VI) changed the ideas of traditional instrument and made full use of the powerful resources of computer. It is a new-style instrument that combines the technologies of electronic measurement, signal processing, computer and network. In this dissertation, a new-style fast virtual oscillograph was designed with the use of VC++ 6.0 programming tool based on a fast data-acquisition card, CS82G and universal PC platform.The research background and significance of VI are introduced in this dissertation firstly including the research status of VI in China and foreign countries. Then, the general technologies of VI are summarized including the definition of VI, the component of VI, the characters of VI and the development of VI, which established the framework of VI. Afterwards, the data-acquisition system is discussed detailedly as well as the studying of the data-acquisition card CS82G On the basis of those work, the system of virtual oscillograph is designed. Chapter 5 is the emphasis of this dissertation. Every module is designed in detail including data-acquisition module, GUI module, FFT module, digital filter module, waveform display module and parameters computing module. Besides, the result of design and experiments is put forward and some key technologies of software are discussed in this chapter. In the end, some existing problems are pointed out as well as the summary work. This dissertation is of important value to the design of correlative fast, large- capability data-acquisition system and VI.