【正文】 ignal input, signal input in the range of 5 ~ +5 V and 0 ~ 10V. Provide 16 singleended / 8 differential analog input channels, 2 independent DA output channels, 24line TTL digital I / O, 3 16bit timer counters, such as multiple functions. These features allow us not only can use the card design virtual oscilloscope, but also can design a virtual function generator or virtual counter, to achieve a multipurpose card. Of course, limited to funding conditions, we chose the PCI1200 card sampling rate can only be reached 100kS / s, the actual Oscilloscopes, this much can not meet the signal bandwidth requirements. Currently on the market sampling rate up to 200MS / s of PCI data acquisition card has been a mature product, the technical realization of highbandwidth virtual oscilloscope problem does not exist. When the actual measurement input signal through the BNC connector from the input data acquisition card to enter the collection. Instrument Function The virtual digital oscilloscope design reference to HP39。 ? Log / Linear choice, provided the coordinates of two kinds of display mode。 [關(guān)鍵詞 ] 虛擬儀器 。從一般的儀器設(shè)計(jì)模型看，一種儀器無非是由數(shù)據(jù)采集、分析處理、人機(jī)交互和顯示等幾部分功能模塊組成的整體。 １ 虛擬示波器的結(jié)構(gòu)與組成 本虛擬數(shù)字示波器主要由一塊 PCI 總線的多功能數(shù)據(jù)采集卡和相應(yīng)的軟件組成。目前市場(chǎng)上采樣速率達(dá) 200MS／ s 的 PCI 數(shù)據(jù)采集卡已有成熟產(chǎn)品，技術(shù)上實(shí)現(xiàn)高帶寬的虛擬示波器不存在問題。編程者可以通過交互式手段，采用圖形化框圖設(shè)計(jì)的方法，完成虛擬儀器的邏輯和測(cè)量分析功能設(shè)計(jì)。觸發(fā)控制包括觸發(fā)模式、觸發(fā)斜坡、觸發(fā)電平控制； 頻譜分析模塊 頻譜分析模塊采用快速 FFT 算法，完成頻域信號(hào)分析。 主要控制結(jié)構(gòu) 測(cè)量控制結(jié)構(gòu) 通過邏輯按鍵 “測(cè)量 ”控制是否進(jìn)行測(cè)量；通過邏輯按鍵 “通道 ”控制通道選擇。 。 正常顯示、記憶顯示控制結(jié)構(gòu) 由雙功能邏輯驅(qū)動(dòng)鍵 “正常 /記憶 ”控制，缺省為正常顯示。Windows 選擇，提供了 9 種頻譜 分析窗口； 時(shí)基控制主要控制采集卡掃描率、每一通道掃描次數(shù)（取樣數(shù)）。 LabVIEW 編程的另一個(gè)優(yōu)點(diǎn)是將軟件的界面設(shè)計(jì)與功能設(shè)計(jì)獨(dú)立開來，修改人機(jī)交互界面無需對(duì)整個(gè)程序進(jìn)行調(diào)試，這對(duì)設(shè)計(jì)像儀器 操作面板這樣復(fù)雜的人機(jī)界面而言是十分方便的。 儀器功能 本虛擬數(shù)字示波器設(shè)計(jì)參考了 HP 公司的雙通道臺(tái)式數(shù)字存儲(chǔ)示波器 HP54603B 的功能，并在儀器分析和處理功能上有所擴(kuò)展。 數(shù)據(jù)采集卡 PCI 總線傳輸速率高 數(shù)據(jù)吞吐量大 是今后數(shù)據(jù)采集板卡設(shè)計(jì)的主流。與傳統(tǒng)儀器相比，虛擬儀器除了在性能、易用性、用戶可定制性等方面具有更多優(yōu)點(diǎn)外，在工程應(yīng)用和社會(huì)經(jīng)濟(jì)效益方面也具有突出優(yōu)勢(shì)。LabVIEW。 through the logic key channel control channel selection. automatically adjust the scan rate of control structure By the logic of key group Automatic, manual to control the scan rate is automatically adjusted or manually adjust the scan rate. display, memory display control structure Logical drive from a dual function keys normal / memory control, the default for the normal show. In a normal state, can only show that A, B twochannel input signal waveform 2。 the use of LabVIEW in the Call Library Function can call the standard dynamic link library (. DLL). In short, LabVIEW as a graphical programming language environment for the development of virtual instrument provides a fast, convenient and powerful software tools. The main function modules Generally speaking, virtual oscilloscope software control by the pletion of signal acquisition, processing and display. System software in general, including data acquisition, waveform display, parameter measurement, spectrum analysis and waveform storage and playback, such as the five modules. Data Acquisition Module Data acquisition module to plete the major data acquisition control, including trigger control, channel selection control, timebase control. Of which: ? trigger control, including the trigger mode, trigger slope, trigger level control。 Virtual Digital Oscilloscope Design and Implementation Yang Leping Lv Yingjun [Abstract] The bination of a virtual digital oscilloscope design and development, introduced the basic ponents of virtual machines, and focuses on the graphical programming language based on LabVIEW virtual instrument programming methods and technology. [Key words] Virtual instruments。 數(shù)據(jù)采集卡驅(qū)動(dòng)程序編寫成動(dòng)態(tài)鏈接庫 (DLL)形式 , 并提供源程序文件。本儀器的測(cè)量精度為 %。 三、儀器硬件設(shè)計(jì) 虛擬儀器硬件包括計(jì)算機(jī)硬件和儀器硬件兩部分 , 其中只有儀器硬件是需要設(shè)計(jì)的。 虛擬儀器以其突出的優(yōu)點(diǎn) , 顯示了強(qiáng)大的生命力 , 它的出現(xiàn)和廣泛使用 , 將對(duì)測(cè)試儀器產(chǎn)生極為深刻的影響。 虛擬儀器是指具有虛擬面板的個(gè)人計(jì)算機(jī)儀器。 20K sampling rate by conservative method can also be reached 5kHZ bandwidth, in line with the general body vibration parameters of the dynamic testing requirements of the rest of the temperature, force, pressure and displacement are Static parameters of the equipment not too high frequency bandwidth design Virtual instrument software is the core of the software design quality has a direct impact on the performance of virtual machines. We will of the entire software design for the open structure of the users according to their actual requirements for software modification or addition. The main instrument of this software from data acquisition card driver module, the virtual panel modules, each module measuring parameters, calibration and error correction module posed of four parts. Virtual panel user interface that is user devices to exchange information with the bridge. The instrument panel layout of the reasonable and easy to operate, highly interactive, user every step of the operation can be prompt and immediate response, and provide online help. DAQ driver into the preparation of dynamiclink library (DLL) form and to provide source documents. Have the ability to develop the pany39。 the use of data acquisition cards to plete A / D conversion by the puter to plete the final data analysis, to deal with. Hardware equipment is mainly responsible for signal conditioning and analogtodigital conversion, through the bus and PC puters to exchange data. Users to use the mouse or keyboard directly in the virtual panel on the operation can be