基于LabVIEW的数字示波器的设计

摘要

众所周知，示波器是测量电子信号的波形的一种仪器，它可以分析计算出波形的各种参数，包括频率、周期、电压等。以往的示波器在某些方面都存在些许不足之处，而利用近年来出现的图形化编辑环境LabVIEW即虚拟仪器的这个平台则可以完善老式示波器的不足，其优势在于可以由用户自己来选择与定义仪器的功能，能更高效率地完成新产品的研发，满足多样化需求。

借助PC机的强大功能，将虚拟仪器的硬件和软件相结合，以完成虚拟示波器的设计。文中介绍了虚拟示波器拟达到的一些技术指标以及设计方案。主要包括数据采集、参数测量、频谱分析、波形显示和波形存储几大模块，可进行数据采集、显示、存储和分析处理，同时显示、记录和存储多通道显示出来的波形，还可以对波形进行数据分析和处理，即完成对模拟信号的数字处理，其中数据采集参数的设置、波形数据存储显示和分析处理都由软件实现，与传统的数字示波器相比，虚拟数字示波器在人性化程度、处理能力、性价比、可操作性等方面都具有明显的优势。

关键词：虚拟仪器；LabVIEW；数字示波器；数据采集

ABSTRACT

As is known to all, oscillograph is a kind of electronic signal waveform measurement instrument, it can analyze the calculated waveform parameters, including frequency, cycle, voltage, etc. Previous oscilloscope is in some ways there are some deficiencies, and the use of LabVIEW graphical editing environment appeared in recent years is the platform of virtual instrument can improve the shortcomings of old oscilloscope, its advantages can be defined by the user to select and the function of the instrument, can be more efficient to complete the new product research and development, meet the demand of diversification.

With the aid of the powerful features of the PC, combining hardware and software of virtual instrument, to complete the design of virtual oscilloscope. This paper introduces a virtual oscillograph is proposed to achieve some of the technical indicators and the design scheme. Mainly including data acquisition, parameter measurement, spectrum analysis, waveform display and waveform storage of several major modules, data acquisition, display, storage and analysis can be processing, at the same time display, recording and storage multi-channel display waveform, can also be the waveform data analysis and processing, the completion of the analog signal digital processing, the data acquisition parameters setting, waveform display and data storage, analysis is implemented by software, compared with the traditional digital oscilloscope, virtual digital oscilloscope in the degree of humanization, capacity, cost performance, operability, etc have obvious advantages.

Key words ：virtual instrument;labview;digital oscilloscope;data collection

目录

1 绪论 (1)

1.1 研究背景与意义 (1)

1.2 数字示波器的发展状况 (1)

1.3 虚拟仪器 (3)

1.3.1 虚拟仪器简介 (3)

1.3.2 虚拟仪器与传统仪器对比 (3)

1.4 研究内容 (3)

1.5 文章结构安排 (4)

2 虚拟数字示波器设计方案 (5)

2.1 LabVIEW (5)

2.1.1 LabVIEW简介 (5)

2.1.2 LabVIEW的优势 (5)

2.2 设计方案 (5)

2.2.1 虚拟数字示波器的设计流程图 (5)

2.2.2 软件设计 (6)

3 数字示波器前面板设计 (7)

3.1 前面板所需模块 (7)

3.1.1 数据采集模块 (7)

3.1.2 触发控制模块 (8)

3.1.3 时基模块 (8)

3.1.4 参数测量模块 (8)

3.1.5 频谱分析模块 (8)

3.1.6 波形显示模块 (8)

3.2 总体前面板设计 (9)

3.2.1 波形显示控制部分 (9)

3.2.2 输入信号测量值的显示部分 (9)

3.2.3 数据存储与读取部分 (10)

3.2.4 波形打印部分 (11)

4 数字示波器后面板设计 (11)

4.1 后面板所需模块 (11)