虚拟示波器的设计.pdfVIP

虚拟示波器的设计 摘 要 虚拟仪器技术是最近二十年发展的一项新技术，其核心思想是“软件就是仪 器”。虚拟仪器利用PC 强大的数据处理能力，由用户根据软件定义的界面来操作 计算机，完成对被测信号的采集、分析、处理、判断及显示等一系列功能，从而实 现仪器的功能。 示波器是在科学研究和高等院校中应用广泛的一种通用仪器。目前研制一种能 够满足高等院校科研和教学要求的示波器是非常必要的。虚拟示波器是虚拟仪器技 术的一种具体应用。该虚拟仪器基于计算机平台，将虚拟仪器硬件和软件紧密结合， 实现比传统仪器更强大的功能。 本文介绍了示波器和虚拟仪器的原理与发展。在此基础上，提出了基于 LabVIEW 的虚拟示波器设计方案。本虚拟仪器系统由数据采集、数据分析和结果 输出显示三个主要功能部分组成。本文介绍了虚拟示波器各模块功能，并给出了具 体的设计方法和测试结果。 关键词：LabVIEW 虚拟示波器 PCI-6221 I 虚拟示波器的设计 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 PCs 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 instruments 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 oscilloscop