Virtual Oscilloscope Research And Design

The research topic of"Virtual Oscilloscope"is one part of the projects of"Electronic Laboratory Virtual Instrument". The purpose of this item is to provide low-cost devices to University Electronic Laboratory, including power, low-frequency signal generator, frequency meter, oscilloscope, spectrum analyzer, logic analyzer, DC/AC voltage meter etc.The system mainly consists of three parts: real-time data acquisition system, using LabVIEW software to develop the virtual instrument's control panel, and the data communication between the control panel and the enhanced parallel port.In the whole development process, I research and design virtual oscilloscope, virtual frequency meter, virtual spectrum analyzer, etc. The paper mainly introduces the design of the data acquisition system, the method of developing EPP device driver, and how to design the application program of the virtual oscillograph by LabVIEW.The most difficult problem is to devise high-speed data acquisiton system by using cheap components.The paper discusses the key technologies and methods about development of virtual oscilloscope. It provides a feasible solution of designing virtual instrument.