低频频率特性测试仪虚拟仪器设计  

A Virtual Instrument Design for Low-Frequency Frequency Response Analyzer

作　　者：薛媛元[1] 蒋东方[1] 蒋晶[1] 

机构地区：[1]西北工业大学自动化学院,陕西西安710129

出　　处：《测控技术》2009年第3期31-34,共4页Measurement & Control Technology

摘　　要：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。To fulfill the requirement of control system design, a virtual instrument of frequency response analy- zer based on correlation analysis and PXI system is designed. Using this virtual instrument, the frequency char- acteristics of both open-loop system and closed-loop system can be measured. The method adopted can effec- tively 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 directly displayed with Bode diagram.

关 键 词：频率特性测试仪 虚拟仪器 相关分析法 闭环系统 

分 类 号：TP216[自动化与计算机技术—检测技术与自动化装置]