【正文】 +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。s concept. Virtual instrument technology with the development of automatic test marks the twentyfirst century and electronic measuring instruments in the field of technological development an important direction. The socalled virtual instruments, that is, in generalpurpose puter platform definition and design of testing apparatus, the puter user, as is the use of a specially designed electronic device. Traditional desktop machines by the equipment manufacturers to design and good function of the definition of an enclosed structure, it has a fixed input / output interface and equipment operation panels, each instrument to achieve a particular type of measurement functions, and to determine the way to the users. Equipment from the general design model of view, is nothing more than an instrument of data collection, analysis, processing, humanputer interaction and display parts and other ponents of the overall function modules. Therefore, we can imagine that, if necessary, the data acquisition hardware and general puter support, software design through the realization of the full functionality of equipment, which is the core of virtual instrument design. Compared with traditional instruments, virtual instruments in addition to performance, ease of use, users can customize and so has many advantages, in engineering applications and socioeconomic benefits are also an outstanding advantage. On the one hand, China39。 LabVIEW。 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。虛擬儀器對傳統(tǒng)儀器概念的重大突破 , 它以結(jié)構(gòu)靈活、操作直觀簡單、容易升級等眾多優(yōu)點(diǎn) , 已成為復(fù)雜儀器和多功能儀器的首選設(shè)計(jì)方式。 本儀器的軟件采用 NI公司的 Lab Windons軟件開發(fā)平臺進(jìn)行編制 , 程序運(yùn)行在Windons98下。 各參數(shù)測量軟件采用模塊化結(jié)構(gòu) , 既合理劃分各測量模塊 , 又增強(qiáng)采用公用部分的通用性 , 并提供復(fù)雜參數(shù)的圖形和表格輸出功能。 數(shù)據(jù)采集卡驅(qū)動程序編寫成動態(tài)鏈接庫 (DLL)形式 , 并提供源程序文件。 虛擬面板即用戶界面 , 是用戶與儀器交流 信息的橋梁。我們將整個軟件設(shè)計(jì)為開放式結(jié)構(gòu)用戶可根據(jù)自己的實(shí)際使用要求 , 對軟件進(jìn)行修改或增補(bǔ)。20K的采樣速率按保守的算法也可達(dá)到 5kHZ的帶寬 , 符合一般機(jī)構(gòu)振動參數(shù)的動態(tài)測試要求 , 其余的溫度、力值、壓力、位移都是靜態(tài)參數(shù) , 對儀器的頻率帶寬沒有太高的要求。本儀器的測量精度為 %。為便于攜帶 , 本儀器采用的是便攜式計(jì)算機(jī)。信號調(diào)理器選用 NI公司 (“ Nationnal Instruments ” 、美國國家儀器公司 , 是一家生產(chǎn)虛擬儀器組件的著名公司 )生產(chǎn)的 SCX1一 1122型多路復(fù)用器 , SCX1一 1122最大可達(dá)到 16通道 , 可調(diào)理應(yīng)變片、熱敏電阻、 RTD、熱電偶和交流電壓信號 , 程序控制切換調(diào)理信號類型。為覆蓋較大測量范圍并滿足一定的測量精度 , 各參數(shù)選用不同測量范圍的多只傳感器。 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。儀器硬件主要負(fù)責(zé)信號調(diào)理和模數(shù)轉(zhuǎn)換 , 通過 PC總線與計(jì)算機(jī)進(jìn)行數(shù)據(jù)交換。我們采用溫度、力值、壓力、位移、振動傳感器配以信號調(diào)理器完成對信號的采集和放大 。最常見的是靠增加儀器的種類來實(shí)現(xiàn)多參數(shù)的測量 , 但這不僅增加了測量費(fèi)用 , 而且還降低了可靠性。 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 , 將對測試儀器產(chǎn)生極為深刻的影響。在通用計(jì)算機(jī)平臺上配置合適的模塊化硬件設(shè)備后 , 接下來 的大量工作便是軟件的編制。 , 突破了傳統(tǒng)儀器在數(shù)據(jù)處理、表達(dá)和存儲等方面的限制 , 取得了傳統(tǒng)儀器無可比擬的效果。操作人員通過友好的圖形界面及圖形化編程語言控制儀器的運(yùn)行 , 完成對被測試量的采集、分析、判斷、顯示、存儲及數(shù)據(jù)生成。 虛擬儀器是指具有虛擬面板的個人計(jì)算機(jī)儀器。TG8 文獻(xiàn)標(biāo)識碼 A 文章編號 1009一 4334(2022)03一 0086一 03 一、引言 儀器儀表長期以來在實(shí)驗(yàn)科學(xué)中占據(jù)著十分重要的地位 , 儀器儀表也是我們進(jìn)行物理教學(xué) ,開展物理實(shí)驗(yàn)的一個重要基礎(chǔ)。 多參數(shù)測量 。s Lab Windons software development platform for the preparation of the procedures in running under the Windons98. 5. Conclusion Using virtual instrument multiparameter measurements simplifying the hardware can greatly reduce the cost of equipment and increase the reliability of the test. Virtual machines on the traditional instruments of the concept of a major breakthrough in its flexible structure, the operation simple and intuitive, easy to upgrade and many other advantages, has bee a plex apparatus and instrument of choice for multifunctional design. With the puter in China to further universal, virtual instrument is bound to be more widely used, it is bound to make physical education a greater contribution. 虛擬儀器實(shí)現(xiàn)多參數(shù)測量 呂冬梅 呂翔 物 理系 , 貴州 3422站 , 貴州 遵義 [摘要 ] 介紹虛擬儀器的概念和優(yōu)點(diǎn) , 詳細(xì)闡述用虛擬儀器實(shí)現(xiàn)多參數(shù)測童的設(shè)計(jì)過程。 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