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Virtual instrument is an instrument in a functional sense , by the personal computer , the instrument hardware and application software , external signals collected by the instrument hardware , software programming to realize the display of the instrument and measurement functions . Virtual oscilloscope design of this project Labview graphical programming tool software development platform , together with the data acquisition card KPCI-3110, study design virtual oscilloscope , compared to traditional oscilloscope , has been greatly improved in the functional use with The high performance and low cost , easy to expand functionality , short development cycle characteristics . The research is primarily responsible for the data acquisition card choose to install , configure and debug from a functional point of view , and in accordance with the needs of the subject of their own design of a data acquisition system , including a magnified portion of the signal conditioning , A / D conversion, and bus interface : data processing and measurement of research and application of the algorithm is proposed to improve the measurement accuracy of the method , and to some extent, improve the function of the system and the measurement accuracy ; compared with the traditional oscilloscope , adds many features , such as : multi-parameter measurement data function of the power spectrum , spectrum analysis , and storage waveform . This paper introduces the virtual instrument technology and research status , analysis of the significance of the study of this subject ; then from the hardware , the software section outlines the overall composition of the virtual oscilloscope program and dedicated software development platform Labview and measurement frequency algorithm and improve the accuracy of frequency measurement ; then from the point of view of the functional design of the the virtual oscilloscope hardware system design , including pre-amplifier , A / D conversion, and bus interface ; modular design ideas , graphics the programming tool Labview design of various parts of the program . Including : data acquisition module , parameter measurement module , time-base / amplitude control module , spectral analysis module , the windowing filter module , waveform display module, memory module , etc.; Finally , sum up the virtual oscilloscope to analyze the performance of the system the characteristics of the test , the virtual oscilloscope has a full-featured , high accuracy , good price , there are some practical value .
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