Based on virtual instrument technology, a multifunctional virtual oscilloscope was designed by using NI USB data acquisition card and LabVIEW software. Its functions included channel selection, signal adjustment, waveform display, time domain analysis, frequency domain analysis, data storage and playback, voltage measurement etc. Compared with the traditional oscilloscope, the designed oscilloscope not only expanded the function, simplified the structure, but also improved economical efficiency. The test practice showed that this virtual oscilloscope had a good performance and a promising application.
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