虛擬示波器的設計

電子機電論文編號:JD247   字數:18009,頁數:52,

目    錄
第一章緒論...................................................................1
  1.1 問題的提出.............................................................1
  1.2 示波器概述與發..........................................................2
    1.2.1 示波器概述.........................................................2
    1.2.1 示波器的發展.......................................................3
  1.3虛擬儀器的概述與發展.....................................................4
    1.3.1 虛擬儀器概述.......................................................4
    1.3.2 虛擬儀器的發展.....................................................5
  1.4 本課題研究內容.........................................................7
  1.5 本課題的研究意義.......................................................7
第二章 虛擬示波器的總體設計方案 ...............................................8
  2.1硬件設計..............................................................8
    2.1.1 數據采集卡的選擇...................................................8
  2.2軟件設計..............................................................13
    2.2.1編程語言選擇 ......................................................13
    2.2.2 NI驅動軟件的選擇..................................................13
    2.2.3虛擬示波器功能設計.................................................15
第三章 LabVIEW軟件介紹......................................................17
  3.1 LabVIEW 程序組成.....................................................17
  3.2 LabVIEW編程模板......................................................18
    3.2.1工具選板..........................................................18
    3.2.2控件選板..........................................................18
    3.2.3函數選板..........................................................19
第四章程序設計..............................................................21
  4.1 數據采集模塊..........................................................21
    4.1.1 DAQ 助手.........................................................22
    4.1.2通道選擇...........................................................23
  4.2波形顯示模塊...........................................................25
    4.2.1波形圖............................................................25
    4.2.2時基控制和幅值控制旋鈕..............................................26
  4.3濾波模塊..............................................................28
    4.3.1濾波器............................................................28
  4.4參數測量模塊...........................................................28
    4.4.1幅值和電平測量.....................................................28
    4.4.2時間與瞬態特性測量..................................................30
    4.4.3頻譜測量..........................................................31
  4.5數據存儲模塊...........................................................32
    4.5.1寫入測量文件.......................................................32
  4.6數據回放模塊...........................................................34
    4.6.1讀取測量文件.......................................................34
  4.7 虛擬示波器前面板......................................................36
  4.8 虛擬示波器程序........................................................37
第五章系統測試..............................................................38
  5.1 虛擬示波器的主要功能...................................................38
  5.2 虛擬示波器的性能指標....................................................38
    5.2.1硬件性能指標........................................................38
    5.2.2軟件性能指標........................................................38
  5.3 數據采集和波形顯示模塊測試...............................................38
  5.4時基控制旋鈕測試........................................................41
  5.5 幅值控制測試...........................................................41
  5.6 濾波模塊測試...........................................................42
  5.7 參數測量模塊測試........................................................44
  5.8 數據存儲模塊測試........................................................45
  5.9數據回放模塊測試.........................................................46
  5.10 系統測試結果..........................................................48
第六章技術經濟分析報告........................................................49
第七章結論與展望..............................................................50
參考文獻....................................................................51
致謝........................................................................52
聲明........................................................................53

摘    要
虛擬儀器技術是最近二十年發展的一項新技術，其核心思想是“軟件就是儀器”。虛擬儀器利用PC強大的數據處理能力，由用戶根據軟件定義的界面來操作計算機，完成對被測信號的采集、分析、處理、判斷及顯示等一系列功能，從而實現儀器的功能。
示波器是在科學研究和高等院校中應用廣泛的一種通用儀器。目前研制一種能夠滿足高等院�？蒲泻徒虒W要求的示波器是非常必要的。虛擬示波器是虛擬儀器技術的一種具體應用。該虛擬儀器基于計算機平臺，將虛擬儀器硬件和軟件緊密結合，實現比傳統儀器更強大的功能。
本文介紹了示波器和虛擬儀器的原理與發展。在此基礎上，提出了基于LabVIEW的虛擬示波器設計方案。本虛擬儀器系統由數據采集、數據分析和結果輸出顯示三個主要功能部分組成。本文介紹了虛擬示波器各模塊功能，并給出了具體的設計方法和測試結果。

關鍵詞：LabVIEW 虛擬示波器  PCI-6221

Abstract
The virtual instrument technology is a new technology which developed in recent twenty years .The core idea of virtual instruments is 'The software is the instrument'. The virtual instrument utilizes the PC's strong data processing ability, operates the computer according to the interface that the software defined, completes a series of function of the signal collecting, analyzing, processing, judging and display, and realizes the function of the instrument.
Oscilloscope is a kind of general instrument extensively used in science research and Universities. It is very necessary to develop a kind of oscilloscope to meet the requirement of scientific research and teaching in universities. The virtual oscilloscope is a kind of application of VI technology. This VI is based on computer. It combines the virtual instrument's hardware with software close to realize the stronger function than traditional instrument.
This thesis introduced the principle and the development of the oscilloscope and virtual instrument. On this basis, this thesis puts forward the design of the virtual oscilloscope scheme based on LabVIEW. The virtual oscilloscope system includes three main function parts. They are data acquisition, data analysis and output display. This thesis presents a virtual oscilloscope for the function of the module, and gives a specific design methods and text results.

Keywords：LabVIEW  virtual oscilloscope  PCI-6221