介绍了基于USB总线的微波功率计工作原理以及基于虚拟仪器技术的功率测试软件组成.实现了基于LabWindows/CVI软件开发平台的USB总线微波功率计测试软件;详细介绍了VISA和多线程技术具体应用,描述了利用VIS驱动器生成向导安装USB驭动程序步骤,给出了使用VISA函数实现USB通讯的主要函数代码,并说明了在LabWindows/CVI环境下使用多线程的方法;经过实际测试与应用,软件运行稳定可靠.具有一定的实用性和推广应用价值.%The paper introduce the theory of the RF digital power meters via USB bus and the test software of the RF digital power meters based on the LabWindows/CVI software development platform. The emphasis is put on the multithreading technique of Lab Windows/CVI and the VISA technique. This paper also showed how to uses the VISA to realize USB communication between the PC and test installment in LabWindows/CVI. The paper discusses the multithreading system beads on the LabWindows/CVI, and introduces its realization.The application shows that this system runs stably and accurately. The technology and methods adopted in the system are practical and worthy of using abroad.
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