【正文】 Data acquisition through the sensor to the measured signals into voltage or current signals, signal acquisition, through data acquisition card and the corresponding process. In this paper, the popular virtual instrument technology to build data acquisition system, which is based on sensor technology and puter technology developed on the basis of measurement and control of emerging technology, the flexibility to form the basis of need in line with the userdefined data acquisition system, breaking the traditional data acquisition mode, the realization of the software to replace equipment, and more fast and agile, dataprocessing functions on a more flexible and diverse. In this paper, for a PCI Bus Virtual Instrument collection program, which is characterized by the adoption of data acquisition cards, as well as the formation of virtual instrument software with the data acquisition system of standards for data signals collection, analysis. In this paper, as the guiding ideology, the position of a suitable program, the main work is based on NI pany PCI6221 data acquisition card for the hardware support, LabVIEW software development platform, through experimental simulation tests in order to achieve realtime data acquisition, data show , data storage, online monitoring and playback of historical data and analysis functions. Tested indicated that thermocouple, SCC68 Junction Box, SCCTC02 Thermocouple processing module and the PCI6221 data acquisition card by building a data acquisition hardware system, enabling realtime acquisition of the temperature of the acquisition process changes in the corresponding adjustment, which reflects the characteristics of virtual instrument technology and advantages. Confirmed in this article used the theory and methods of data collection is feasible. Key words： Virtual instrument； DAQ； LabVIEW； PCI6221； SCC68； SCCTC02 內(nèi)蒙古科技大學(xué)畢業(yè)設(shè)計(jì) 說(shuō)明書(shū)（畢業(yè) 論文 ） 目 錄 摘 要 ....................................................................................................................................... V Abstract ..................................................................................................................................... VI 第一章 緒論 .............................................................................................................................. 1 研究目的及意義 ......................................................................................................... 1 國(guó)內(nèi)外研究現(xiàn)狀 ......................................................................................................... 1 本文研究的主要內(nèi)容 ................................................................................................. 3 第二章 數(shù)據(jù)采集方案設(shè)計(jì) ...................................................................................................... 4 虛擬儀器組成 ............................................................................................................. 4 高效的軟件 ...................................................................................................... 4 模塊化的 I/O 硬件 ........................................................................................... 5 用于集成的軟硬件平臺(tái) .................................................................................. 5 虛擬儀器的特點(diǎn) ......................................................................................................... 6 性能高 .............................................................................................................. 6 可擴(kuò)展性強(qiáng) ...................................................................................................... 6 無(wú)縫集成 .......................................................................................................... 6 虛擬儀器的發(fā)展前景 ................................................................................................. 7 虛擬儀器軟件介紹 ..................................................................................................... 7 可視化編程工具 .............................................................................................. 7 LabWindows/CVI .............................................................................................. 8 LabVIEW........................................................................................................... 8 第三章 數(shù)據(jù)采集硬件設(shè)計(jì) .................................................................................................... 10 內(nèi)蒙古科技大學(xué)畢業(yè)設(shè)計(jì) 說(shuō)明書(shū)（畢業(yè) 論文 ） 數(shù)據(jù)采集卡 ............................................................................................................... 10 數(shù)據(jù)采集卡的選用 ........................................................................................ 10 PCI6221 型數(shù)據(jù)采集卡 ................................................................................. 12 傳感器的選擇 ........................................................................................................... 12 信號(hào)調(diào)理模塊 ........................................................................................................... 14 接線盒 ....................................................................................................................... 15 NIDAQ 安裝 ............................................................................................................. 16 DAQmx 介紹 .............................................................................................................. 18 第四章 數(shù)據(jù)采集軟件設(shè)計(jì) .................................................................................................... 20 軟件總體設(shè)計(jì) ........................................................................................................... 20 主程序 ....................................................................................................................... 20 主程序框架 .................................................................................................... 20 主程序前面