基于LabVIEW的电子秤的设计

摘要

随着科学技术的进步，对测量技术的要求越来越高。电子测量技术在各个领域得到了越来越广泛的应用。传统的电子测量仪器由于其功能单一，体积庞大，己经很难满足实际测量工作中多样性、多功能的需要。以虚拟仪器为代表的新型测量仪器改变了传统仪器的思想，它们充分利用计算机强大的软硬件功能，把计算机技术和测量技术紧密结合起来，是融合了电子测量、计算机和网络技术的新型测量技术。特别是基于计算机平台的各种测量仪器由于成本低、使用方便等优点得到了更广泛的应用。

本设计是结合传感器技术、数据采集技术和虚拟仪器技术开发设计了一种基于LabVIEW的电子秤，该系统采用普通PC 机为主机，利用图形化可视测试软件LabVIEW 为软件开发平台，将被测重量转换、处理、进行数据采集，实时进行处理、显示。

关键词：电子秤；虚拟仪器；LabVIEW

Design of the intelligent electronic

steelyard based on LabVIEW

Abstract

With the development of science and technology,the requirement on measurement technology is getting more and more important.The application of electronic measurement technology has extended to more fields than before.Due to limited functions and big size,traditional electronic measuring equipments are no longer suitable to common purposes.The rapid development of integrated circuit and computer technology gives birth to a new kind of instrument,Virtual Instrument(VI).As a result,the testing cost increases by a wide margin.In recently years,a new measure technology that combines the technology of electron,technology of computer,technology of network,is developed and this new technology is named VI.Especially various measuring instruments based on computer,they are more widely used because of their excellence such as:lower cost,easily used,etc.

This design is to develop and design a kind of electronic steelyard based on LabVIEW，which combines the sensor technology，data gathering technology and the national instrument technology, the system used for ordinary PC-host, the use of graphic visual test software for LabVIEW software development platform, the weight will be tested Conversion processing of data acquisition, real-time processing and manifesting.

Key words: electronics steelyard; virtual instrument; LabVIEW

目录

摘要......................................................................................................................................... I Abstract ......................................................................................................................................II 第一章引言. (1)

1.1 研究背景 (1)

1.1.1 称重技术和衡器的发展 (1)

1.1.2 电子秤的发展状况 (2)

1.2 本章小结 (3)

第二章电子秤的功能、分类及现状 (4)

2.1 电子秤的系统构成及其使用功能 (4)

2.2 电子秤的分类 (5)

2.3 电子秤的现状 (5)

2.4 本章小结 (8)

第三章虚拟仪器和LabVIEW简介 (9)

3.1 虚拟仪器 (9)

3.1.1虚拟仪器的发展史 (10)

3.1.2虚拟仪器的主要特点 (12)

3.1.3虚拟仪器的现状 (13)

3.1.4虚拟仪器的发展方向 (13)

3.2 LabVIEW语言 (14)

3.2.1 LabVIEW使用的优势 (15)

3.2.2 LabVIEW的图形化程序设计 (16)

3.2.3图形化的程序设计的步骤 (16)

3.3 本章小结 (17)

第四章基于LabVIEW的电子秤设计 (19)

4.1 电子秤的硬件设计 (20)

4.1.1 传感器 (20)

4.1.2 信号调理电路 (21)

4.1.3 数据采集 (23)

4.1.4 PCI-6221数据采集卡 (27)

4.2 电子秤的软件设计 (28)

4.2.1 前面板登录界面设计 (29)

4.2.2 前面板界面设计 (29)

4.2.3 程序框图设计 (30)

4.3 波形和数据显示 (33)

4.4 本章小结 (36)

总结 (37)

参考文献 (38)

致谢 (40)