虚拟数字存储示波器中英文资料外文翻译文献Virtual-digital storage oscilloscopeVirtual digital storage oscilloscope-the structure and composition：Virtual digital oscilloscope PXI bus from a multi-functional data acquisition card and the corresponding software. They will be installed on a PC running Windows, constitutes a powerful can store digital oscilloscope.Data AcquisitionThe design of NI is used by the companys multi-purpose data acquisitioncardPXI-6670E, its main functions are as follows: 64-way single-ended / 32-way differential analog input; 12 accuracy; 1.25 MSPS sampling speed; 1.25 MSPS disk write speed ; 0.05 10V input range; two-way 12 analog outputs; eight digital I/O.two-way 24 counter /timer.Functional equipment In this case virtual digital oscilloscope with real-time data acquisition, spectralanalysis and window treatment and filtering capabilities. In the virtual digital oscilloscope main panel on data collection and analysis of the spectrum, and window processing, filtering and other function keys, according to the corresponding button we can enter into the appropriate sub-panel.Software Design and ImplementationVirtual digital oscilloscope software design based on the use of C-language programming environment LabWindows / CVI. LabWindows / CVI support numerical type, Boolean, and the string of text, and other data types, but the biggest advantage is through dialog forms of interactive operations generate standard C code. In addition LabWindows / CVI provides a very rich debug tools, including single-step, breakpoints, variable view, monitor window, and so on, these features make the adjustment process has become more vulnerable.The main function modulesVirtual digital oscilloscope mainly by the software control signals the completion of the acquisition and display processing, data collection in the main panel to complete the following features: Setting up access, set up sampling frequency, set up a manner that waveform, data collection in the main panel to complete the following Features: Acquisition of real-time signal and the signal on its own spectrum analysis, see lines, and other functions, and window panels dealing with the acquisition of real-time signal and the signal to increase processing windows (including windows Haiming, Hamming window, Buiakean smoothing windows and window, etc.).Filtering in handling panel includes the following features: the acquisition of real-time signal and the signal on its own filtering treatment (including single-step filtering, multi-step filtering method and tradit ional methods, etc.) The source files generated when the control panel to complete the set, you can have a function of the code of procedure. Specific methods for: to have completed the panel as a response to the current state of the Code menu, select Generate in the All Code, in the pop-up dialog function selected in the main panel and withdraw from the function , And the user interface will be able to produce documents relative to the framework of the code function.Add the code generated automatically step on the corresponding control is a function of the framework, to make certain controls to complete the function, we must add code to control the controls. One main () function is the entrance procedures, it is the function of initialization procedures, loading the user and display panels, such as to complete other functions required to add code. Following the code for data acquisition functions, data acquisition process by calling the callback function button SHOU external acquisition.Software development environment: virtual digital oscilloscope software design based on the use of C-language programming environment LabWindows / CVI. LabWindows / CVI support numerical type, Boolean, and the string of text, and other data types, but the biggest advantage is through dialog forms of interactive operations generate standard C code. In addition LabWindows / CVI provides a very rich debug tools, including single-step, breakpoints, variable view, monitor window, and so on, these features make the adjustment process has become more vulnerable.Have the function function with real-time display: Acquisition Acquisition signal to the input signal and real-time display in a PC terminal. digital filtering: IIR filter on the use of digital signal processing and real-time filtering, at the same time filter can be set up in the best approximation function type, filter type, order, from top to bottom cut-off frequency, and other parameters. latest wave show: to meet the transient waveform display, but can also be transient waveform to be saved. waveform storage: at any time after the original signal or signals to the LVM LabVIEW unique file format stored on the local hard drive, for future analysis or processing. One transient signal to the cut-off wave after BMP format images stored in local hard上供view and analysis of the future. significant wave back: to