Abstract
The emergence and development of virtual instrument technology, represented by LabVIEW (NI)，has brought about the revolution to traditional instrument and fast advancement in the instrument industry. LabVEIW(NI) is not only a virtual test instrument ,but also a peripheral of computer with the support of powerful software and hardware resources. Hence it is a technology that tightly combines the computer with test instrument.
This dissertation presents a design of oscilloscope based on USB, that is used for the investigation of technology of embedded systems and virtual oscilloscope can perform not only the functions that a traditional oscilloscope can, but also some that cannot be realized by underlying hardware jointly with epistasis software. Especially, it can reduce the whole manufacture cost of the instrument significant. Major contribution of the dissertation is the proposal of a design of hardware at bottom layer of the virtual oscilloscope and the discussion on the associated epistasis software. This article discussed the virtual oscilloscope which are including upper PC signal processing, software panel dispalys, data acquisition and the function that through the USB to communicate with the lower machine。
The first part of the paper introduces the basic situation of the present research;the second part talk about the virtual oscilloscope based on LabVIEW and it’s methods; the third part introduces the design of virtual oscilloscope in the lower PC；and then the fourth part gives the software design of the virtual oscilloscope in the upper PC; the fifth section discusses the virtual oscilloscope LabVIEW-based experiments and debugging. At last, it discusses to improve and perfect the system and gives a summary and outlook.
