【正文】 本科生畢業(yè)論文 1 本科生畢業(yè)論文 基于 LABVIEW 的虛擬示波器設(shè)計(jì) 第一章：緒論 ........................................................................................................................... 4 1． 1 虛擬儀器概述 ................................................................................................................................................4 1． 1． 1 虛擬儀器的產(chǎn)生 .................................................................................................................................4 1． 1． 2 虛擬儀器的概念 .................................................................................................................................4 1． 1． 3 虛擬儀器的構(gòu)成 .................................................................................................................................5 虛擬儀器的優(yōu)點(diǎn) .....................................................................................................................................7 1． 2 虛擬儀器的現(xiàn)狀 ............................................................................................................................................8 1． 2． 1 國(guó)外現(xiàn)狀 ..............................................................................................................................................8 1． 2． 2 國(guó)內(nèi)現(xiàn)狀 ..............................................................................................................................................9 1． 2． 3 發(fā)展趨勢(shì) ............................................................................................................................................ 10 課題背景和課題目的 .....................................................................................................................................11 本文的研究?jī)?nèi)容 ..............................................................................................................................................11 第二 章 方案及關(guān)鍵技術(shù) ...................................................................................................... 13 2． 1 虛擬儀器創(chuàng)建過(guò)程 ..................................................................................................................................... 13 數(shù)據(jù)采集基礎(chǔ)知識(shí) ........................................................................................................................................ 14 采樣定理 ................................................................................................................................................. 14 模擬信號(hào)與數(shù)字信號(hào) ............................................................................................................................ 17 A/D 轉(zhuǎn)換技術(shù) .......................................................................................................................................... 17 D/A 轉(zhuǎn)化技術(shù) .......................................................................................................................................... 22 PCI6221 數(shù)據(jù)采集卡慨述 ............................................................................................................................. 26 安裝與測(cè)試 ..................................................................................................................................................... 28 硬件的安裝 ............................................................................................................................................. 29 測(cè)試 ......................................................................................................................................................... 30 信號(hào)連接 ......................................................................................................................................................... 31 基于 LABVIEW的虛擬示波器設(shè)計(jì) 2 管腳圖 ..................................................................................................................................................... 31 輸入連接 .................................................................................................................................................. 32 模擬信號(hào)輸出連接及外圍電路 ............................................................................................................ 34 設(shè)計(jì) 軟件比較 ................................................................................................................................................ 34 總體設(shè)計(jì) ......................................................................................................................................................... 36 第三章 軟件模塊的設(shè)計(jì) ...................................................................................................... 37 程序的流程圖 ............................................................................................................................................... 37 3． 2 程序的結(jié)構(gòu)圖 ............................................................................................................................................. 37 3． 3 LABVIEW 簡(jiǎn)介 .............................................................................................................................................. 38 3． 3． 1 G 語(yǔ)言簡(jiǎn)介 ..................................................................................................................................... 39 3． 3． 2 LABVIEW 程序組成 ..................................................................................................................... 39 3． 4 數(shù)據(jù)采集 .................................................................................................................................................... 40 DAQmx 介紹 ......................................................................................................................................... 40 程序整體設(shè)計(jì) ....................................................................................................................................... 41 程序框圖 ...................................................................................