摘要：随着计算机技术和网络技术的发展，传统测量仪器的功能和作用发生了重大的变化，新的虚拟仪器开始产生。从本质上来说，虚拟仪器是利用高性能的模块化硬件，结合高效灵活的软件来完成各种测试、测量和自动化的应用。LabVIEW作为工业标准图形化编程工具，已广泛用于自动化、汽车、通信、等各个领域。它强调“软件即是仪器”的概念。用户可以根据自己需要定义仪器功能，以及开发测试、测量、控制、数据采集等工作。相比较传统仪器更加便捷，功能更加全面，用户参与度高。

本文是在通过了解虚拟仪器发展历史、发展趋势以及国内外研究现状、了解传统信号发生器的工作情况的基础上，对比了传统仪器的原理和特点来阐述虚拟信号发生器的功能优越性以及虚拟信号发生器的优点。

本设计基于LabVIEW的虚拟信号发生器设计，是在LabVIEW软件和NIELVIS实验套件基础上通过NI公司的软件开发平台的来实现的。本设计基于NI公司的LabVIEW软件和NIELVIS实验套件来实现能够按要求产生并输出多种类型的常用信号及自定义函数信号波形（包括模拟信号和脉冲信号），并按要求使其具有信号选择、幅值调整、频率调整、噪声调整等功能。

仿真和实验结果显示了该系统能产生基本波形、公式波形以及PWM波波形，验证了所设计系统的正确性，可行性。与传统信号发生器相比，虚拟信号发生器更具优势，它能节省空间、节约成本、系统操作性和系统功能性更加优越。虚拟仪器信号发生器的操作简便、人机交互性强、并且用户可以根据任务需求来修改功能。

关键词：虚拟仪器；LabVIEW；NI-ELVIS；虚拟信号发生器

Abstract：With the development of computer technology and network technology, the function and function of traditional measuring instruments have undergone significant changes, and new virtual instruments have been produced. In essence, the virtual instrument is the use of high-performance modular hardware, combined with efficient and flexible software to complete a variety of test, measurement and automation applications. LabVIEW as an industry standard graphical programming tool, has been widely used in automation, automotive, communications, and other fields. It emphasizes  the concept  of "software is the instrument". Users can define their own functions according to their needs, as well as the development of test, measurement, control, data acquisition and so on. Compared to traditional instruments more convenient, more comprehensive, high user participation.

This paper is based on the understanding of the development history of the virtual instrument, the development trend and the research status at home and abroad, understand the work of the traditional signal generator, based on the comparison of the traditional instrument of the principles and characteristics of the virtual signal generator to illustrate the functional superiority and virtual The advantages of the signal generator.

The design of the virtual signal generator design based on LabVIEW is based on LabVIEW software and NI ELVIS experimental suite through NI's software development platform to achieve. This design is based on NI's LabVIEW software and the NI ELVIS lab suite to produce and output multiple types of common signals and custom function signal waveforms (including analog and pulse signals) as required and to have signal selection as required , Amplitude adjustment, frequency adjustment, noise adjustment and other functions.

Simulation and experimental results show that the system can generate the basic waveform, the formula waveform and the PWM wave waveform, and verify the correctness and feasibility of the designed system. Compared with the traditional signal generator, the virtual signal generator more advantages, it can save space, cost savings, system operability and system functionality is more superior. Virtual instrument signal generator is easy to operate, human-computer interaction is strong, and the user can modify the function according to the task requirements.