基于虚拟仪器的网络频率特性测试仪

摘要

介绍了一种基于虚拟仪器的网络频率特性测试仪,它利用多功能采集卡的模拟输出通道产生扫频激励信号,利用2个模拟输入通道同时采集激励和响应,通过LabVIEW软件分析并显示结果.给出了该仪器的设计方法和LabVIEW程序.双T滤波网络的测试结果表明,该仪器可满足实际需求.%This paper presented a network frequency characteristic testing meter based on virtual instrument.It can generate the linear frequency modulation signal by the output channel of the multifunctional board,the drive and response can be acquied simultaneously by two input channels.The signal can be analyzed by LabVIEW and the result can be displayed by computer.The design method of the system and LabVIEW procedure were given.A twin T network was tested by the meter.The experimental results show that the meter can be used in actual circuit.