虚拟仪器比传统仪器功能更强、可扩展性更好、性价比也更高,是未来测量测试行业的发展方向。完成了一种对马达故障波形进行显示分析的虚拟示波器软件设计,为马达故障分析提供了定量的分析工具。软件采用面向对象的软件设计思想来编写,按照功能划分为5个模块:虚拟示波器界面设计、异步串口通信、Modbus协议软件包、波形傅里叶分析、波形存储访问五大模块,使用VC++基于对话框的应用程序框架完成了这5个模块的详细设计和实现;通过测试,该虚拟示波器操作简单、测量准确,能满足使用要求(Compared with traditional instruments, virtual instrument has more powerful functions, better scalability and higher performance price ratio, which is the future direction of measurement and test industry. A software design of virtual oscilloscope for displaying and analyzing the motor fault waveform is accomplished, which provides a quantitative analysis tool for motor fault analysis. The software adopts the idea of object-oriented language, is divided into 5 modules: virtual oscilloscope interface design, asynchronous serial communication, Modbus protocol software package, waveform Fourier analysis, waveform storage and access five modules, using VC++ dialog application fr a mework to complete the detailed design and implementation of the 5 modules based on; through the test, the virtual oscilloscope has the advantages of simple operation, accurate measurement, can satisfy the use requirement)