测试技术学报2024，Vol.38Issue(2)：139-146,8.DOI:10.3969/j.issn.1671-7449.2024.02.006
数据采集系统共模抑制比的测量实验研究
On the Measurement Experiment of Common Mode Rejection Ratio of Data Acquisition Systems
摘要
Abstract
This paper introduces the concept,connotation and definition of common mode rejection ratio(CMRR)parameter of data acquisition system(DAS),and expounds on several problems in the measure-ment of CMRR of DAS:1)nonlinear transfer problems of common mode interference;2)Diversity of common mode interference;Namely,DC offset form,AC fluctuation form and noise level change form;3)Measurement and elimination methods of background noise impact;That is,variance(energy)subtrac-tion method,effective value direct subtraction method,and absolute value mean direct subtraction method;4)Influence of termination mode of common mode signal;5)The difference between DC CMRR and AC CMRR.Based on the experimental results of a typical data acquisition system,the influ-ence of the above different conditions on the CMRR measurement results is described,and technical sug-gestions for CMRR measurement of data acquisition systems are given.关键词
计量学/共模抑制比/计量评价/校准/数据采集系统Key words
metrology/CMRR/measure evaluation/calibration/data acquisition systems分类
机械制造引用本文复制引用
梁志国,冯秀娟..数据采集系统共模抑制比的测量实验研究[J].测试技术学报,2024,38(2):139-146,8.基金项目
国家规范修订计划资助项目([2021]237号) （[2021]237号）
