【正文】 ............................................................................................................................9 課題背景和課題目的 ...............................................................................................................................10 本文的研究內容 ........................................................................................................................................10第二章 方案及關鍵技術 .......................................................................................................122．1 虛擬儀器創(chuàng)建過程 .................................................................................................................................12 數(shù)據(jù)采集基礎知識 ...................................................................................................................................13 采樣定理 ............................................................................................................................................13 模擬信號與數(shù)字信號 ........................................................................................................................16 A/D 轉換技術 ......................................................................................................................................16 D/A 轉化技術 ......................................................................................................................................21 PCI6221 數(shù)據(jù)采集卡慨述 .........................................................................................................................25 安裝與測試 ................................................................................................................................................27 硬件的安裝 ........................................................................................................................................28 測試 ....................................................................................................................................................29 信號連接 ....................................................................................................................................................30 管腳圖 ................................................................................................................................................30 輸入連接 .............................................................................................................................................31 模擬信號輸出連接及外圍電路 ........................................................................................................33 設計軟件比較 ...........................................................................................................................................33 總體設計 ....................................................................................................................................................35第三章 軟件模塊的設計 .......................................................................................................36滿意設計: 基于 LABVIEW 的虛擬示波器設計2 程序的流程圖 ...........................................................................................................................................363．2 程序的結構圖 .........................................................................................................................................363．3 LABVIEW 簡介 .........................................................................................................................................373． 3． 1 G 語言簡介 ................................................................................................................................383． 3． 2 LABVIEW 程序組成 .................................................................................................................383．4 數(shù)據(jù)采集 ...............................................................................................................................................39 DAQmx 介紹 ....................................................................................................................................39 程序整體設計 ..................................................................................................................................40 程序框圖 ..........................................................................................................................................40 濾波及分析 ................................................................................................................................................42 濾波分析 ............................................................................................................................................42 數(shù)據(jù)分析 ............................................................................................................................................43 多線程技術 ................................................................................................................................................44 Windows 的多線程機制 .....................................................................................................................44 LabVIEW 與多線程 ............................................................................................................................45 多線程技術在本設計中的應用 ........................................................................................................45 并行處理 .............................................................................................................................................463．7 小結 .........................................................................................................................................................47第四章 程序設計顯示 ...........................................................................................................484．1 前面板設計 .............................................................................................................................................48