摘要:传统仪器随着计算机技术的发展逐渐向计算机的方向转化。虚拟仪器是现代仪器技术、计算机技术等其他高新技术相结合，并且推动着传统仪器向模块化、数字化、智能化方向发展，其功能和实用性远远超过了传统仪器。

　　　本次设计的虚拟示波器是基于由美国国家仪器（NI）公司研制开发的LabVIEW软件。主要的实现方法是采用LabVIEW软件设计出具有信号采集、波形显示、自动测量、频谱分析功能的虚拟示波器。本次设计所需的硬件是计算机内置的声卡，由于声卡在某些方面上的不足，只能用来测量普通音频范围内的信号，在最后的调试中用音频线将函数信号发生器与电脑相连，通过LabVIEW软件设计出的虚拟示波器分别显示正弦波，三角波，方波的波形。

　　　本次设计的虚拟示波器特点通用性强，价格低廉。在对采样频率要求不是很高的情况下，能对声音信号进行采集、显示的虚拟示波器。

关键词 计算机；虚拟仪器；传统仪器；LabVIEW；虚拟示波器

Abstract:Traditional instruments, with the development of computer technology gradually to the direction of the computer. Virtual instrument is the modern instrument technology, computer technology and other high and new technology, and promotes the traditional instruments to modularization, digital and intelligent direction, its function and practicability has gone far beyond the traditional instruments.

　　　Was the design of virtual oscilloscope based on by the U.S. national instrument (NI) developed by LabVIEW software. The realization of the main method Was to use the LabVIEW software design with signal acquisition, waveform display, automatic measurement, spectrum analysis function of the virtual oscilloscope. Needed for the design of hardware was the built-in computer sound card, due to the lack of sound cardwas in some ways, could only be used to measure the average range of audio signals, in the final debugging using the audio line the function signal generator wais connected to a computer, respectively by the LabVIEW software design of virtual oscilloscope display sine wave, triangle wave, square wave of the waveform.

　　　The design of virtual oscilloscope features a universality, low prices. Under the condition of the requirements for sampling frequency is not high, can the sound signal acquisition, display of the virtual oscilloscope.

Keywords  The computer  Virtual instrument  Traditional instruments  LabVIEW  The virtual oscilloscope