低频频率特性测试仪虚拟仪器设计

为了满足控制系统设计需要,利用相关分析方法和PXI系统设计了一台针对控制元件和系统的频率特性测试虚拟仪器.设计的虚拟仪器既适用于对开环系统又适用于对闭环系统的频率特性进行测试.采用的分析方法可以有效滤除测量过程中引进的噪声和低频漂移,并消除测量系统的非线性对测试结果的影响.频率特性测试结果直接以波特图形式给出.

A Virtual Instrument Design for Low-Frequency Frequency Response Analyzer

To fulfill the requirement of control system design,a virtual instrument of frequency response analyzer based on correlation analysis and PXI system is designed.Using this virtual instrument,the frequency characteristics of both open-loop system and closed-loop system can be measured.The method adopted can effectively filter out the noise and low frequency drift produced in measuring process,and eliminate the non-linear distortion of measurement system.The measure result of frequency characteristic is direc...