基于Labview的虚拟数字钟设计

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摘  要：虚拟仪器的出现彻底打破了传统仪器只能由厂家定义，用户无法改变的模式，计算机技术与网络技术的飞速发展，使得虚拟仪器已经成为现代电子测量仪器发展的趋势。
数字钟是一种采用数字电路可实现时、分、秒显示电路的计时装置，在数字逻辑电路中，数字钟的构建具有其典型意义。
虚拟仪器具有传统仪器无法比拟的优势，在测试领域，虚拟仪器可取代一部分独立仪器的工作,完成复杂环境下的自动化测试，完成传统的独立仪器难以胜任的的工作。
本文首先介绍虚拟仪器的软件开发环境LabVIEW，虚拟数字钟的组成原理，充分利用虚拟仪器LabVIEW软件技术中提供的布尔逻辑量及运算符实现了构建虚拟数字钟的各个模块，计时模块和校时模块等。各模块之间通过高层功能的VI调用一个或多个底层的特殊功能的VI，完成了虚拟数字钟的实现。

关键词：数字钟；虚拟仪器；labview；数字逻辑电路

The design for a virtual digital clock based on labview
Abstract: Due to the emergence of virtual instruments, the mode which traditional instrument can only be defined by manufacturers and can not changed by the user, is broken thoroughly. With the rapid development of computer and network technology, the virtual instrument has become a developing trend of modern electronic measuring instruments.    
The digital clock is a counting device which can be realized on displaying hours, minutes and seconds time by using digital circuits. In digital logic circuits, the construction of digital clocks has its typical significance.
Virtual instruments have advantages which the traditional instruments cannot match. In the measuring field, virtual instruments can be used to replace a part the work of independent instruments, to acquire the automated test in a complex environment, to accomplish the incompetent task for traditional independent instruments.
In this paper the software development environment LabVIEW of the virtual instrument and the composition principle of virtual digital clocks are introduced firstly. Boolean logic volumes and operators of LabVIEW are taken full advantage for building modules of virtual digital clock, such as counting modules and correcting time modules etc. Each bottom module can be called by high-level functions of VI for realization of a virtual digital clock.
Keywords: a digital clock; virtual instruments; LabVIEW; digital logic circuits

摘要 
目录 
1．绪论  1
1.1课题的现状与发展趋势  1
  1.2课题研究的意义  1
2.虚拟仪器概述  2
  2.1虚拟仪器的概念  2
2.1.1虚拟仪器的产生  2
2.1.2 虚拟仪器的发展过程  3
2.2虚拟仪器与传统仪器的比较  3
2.3 虚拟仪器系统的构成  4
2.31计算机系统  5
2.32接口硬件设备  5
2.4虚拟仪器的软件开发平台  6
  2.5 LabVIEW及其应用  7
      2.5.1 LabVIEW  7
2.5.2 Labview程序的运行机制  9
 2.5.3 LabVIEW应用于测试与测量  9
2.5.4 LabVIEW应用于实验室研究与自动化  9
2.5.5 LabVIEW应用于过程控制和工业自动化  10
2.5.6 LabVIEW与虚拟仪器  10
3. 虚拟数字钟系统介绍  11
3.1数字钟的功能  11
3.11时钟信号发生器的功能   11
3.12七段译码器的功能  11
3.13十进制计数芯片的功能  12
3.14 校时电路  12
3.2虚拟数子钟系统实现  13
4. 虚拟数字钟的实现方案  13
  4.1虚拟数字钟系统设计  13
4.2时钟信号发生器  14
4.3七段译码器模块  17
4.4十进制计数器芯片  19
4.5校时电路  23
4.6虚拟数字钟系统实现  24
5.虚拟数字钟系统涉及的关键技术  27
5.1 Labview软件  27
5.2前面板设计  27
5.3 程序图设计  27
5.4模快和控件的调用  28
6．虚拟数字钟与传统数字钟的比较  29
7．结论  29
参考文献  31
致谢  32

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