学士学位论文I摘 要采用虚拟仪器技术对高精度的频率源进行测量，具有简单、易行、精度高的特点。这与以往利用实际仪器仪表对频率进行测量在方法上有着很大的不同。 LabVIEW就是基于虚拟仪器的开发环境，本文阐述了基于虚拟仪器技术在频率测量中的实际应用，根据电子测量的基本原理、计算方法和流程，实验利用了LabVIEW的特有语言G语言对被测对象进行程序编译、运行、修改并最终显示运行结果。在实现频率测量的过程中，利用声卡代替了数据采集卡，把声音数据采集上来作为信号源，通过测量声音的频率，对外界声音信号进行仿真实验，最后给出了被测信号频率的仿真结果。实验结果以图形显示和数据显示的方式，对被测对象进行了准确地测量。通过实验，实现了虚拟仪器对信号频率的测量。虚拟仪器是电子测量中的新技术，有着广阔的发展前景，是实验、教学及检测领域的重要技术。关键词: 虚拟仪器；电子测量；频率测量 学士学位论文IIABSTRACTAdopting virtual instrument technique in the frequency source that high accuracy has characteristics of simplify、easy operation and high accuracy .This has the very big difference with the former frequency measurement method.LabVIEW was based on the virtual instrument development environment, and this article elaborates the practical application of virtual instrument technology in the frequency measurement. According to the basic theories、the computational method and the flow of electronic measurement, the experiment used the LabVIEW unique language (G language) to compile, run, correct the measured subject and eventually display the result. During the process of realizing the frequency measurement, there are some steps including using the sound card instead of data acquisition card as the signal source, measuring the frequency of sound, carrying out simulation experiment for outside voice acquisition and finally giving out the simulation results of the frequency of the measured signals. The result of experiment has measured the subject accurately by the means of displaying graph and data. The experiment has realized the measurement of signal frequency in the virtual instrument.Virtual instrument is a new technique in electronic measurement, having vast development foreground, and is the important technique of experiment, teaching and in the field of detection. Keywords: Virtual instrument; Electronic measurement; Frequency measurement学士学位论文III目 录引 言.1 1 电子测量.2 1.1 测量概述.2 1.1.1 测量的基本概念.2 1.1.2 测量的重要意义.3 1.2 电子测量的特点和应用.3 2 虚拟仪器及 LabVIEW 基础.6 2.1 虚拟仪器概述.6 2.1.1 定义.6 2.1.2 比较与差异.6 2.1.3 虚拟仪器对电子测量的影响.8 2.2 LabVIEW 概述.8 2.1.1 LabVIEW 简介.8 2.1.2 LabVIEW 的体系结构.9 3 时间与频率的测量.11 3.1 概述.11 3.1.1 时间、频率的基本概念.11 3.2 数据采集.11 3.2.1 数据采集系统的构成.11 3.2.2 数据采集卡简介.12 4 设计方法.15 4.1 可行性研究及需求分析.15 4.1.1 开发背景.15 4.1.2 需求分析.15 4.1.3 设计思想.22 4.2 设计方法在 Labview 中的实现.