基于“虚拟仪器”的思想提出了虚拟频率特性测试仪的设计方法。首先简要介绍了扫频测量的工作原理,之后详细讨论了硬、软件两部分的设计。硬件部分给出了实现主要功能的电路框图并给予相关说明,软件部分详述了开发中遇到的主要问题,解决方法及有关算法。最后给出了测试某网络的部分实例图和指标,从而证明了本设计的可行性。 Based on the idea of ​​“virtual instrument”, the design method of virtual frequency characteristic tester is proposed. First of all, the working principle of swept-frequency measurement is briefly introduced. After that, the design of both hardware and software is discussed in detail. The hardware part gives the circuit diagram to realize the main function and gives the related explanation. The software part details the main problems, the solutions and the related algorithms encountered in the development. In the end, some examples and indicators of testing a network are given, which proves the feasibility of this design.