平均值法交流共模抑制比测量不确定度评定  

The Measurement Uncertainty Evaluation of AC Common Mode Rejection Ratio of Data Acquisition Aystems by Using Averaging Method

作　　者：梁志国[1] 冯秀娟[2] LIANG Zhi-guo;FENG Xiu-juan(National Key Laboratory of Metrology and Calibration Technology,Changcheng Institute of Metrology and Measurement,Beijing 100095,China;Institute of Mechanics and Acoustic Metrology,National Institute of Metrology,Beijing 100029,China)

机构地区：[1]北京长城计量测试技术研究所计量与校准技术重点实验室,北京100095 [2]中国计量科学研究院力学与声学计量科学研究所,北京100029

出　　处：《计量学报》2023年第11期1749-1754,共6页Acta Metrologica Sinica

基　　金：国家市场监督管理总局国家规范修订计划项目([2021]237号)。

摘　　要：介绍了使用幅度绝对值的平均值法进行数据采集系统交流共模抑制比的测量不确定度分析和评价过程。使用测量幅度绝对值的平均值计算干扰分量值和本底噪声分量值,并采用直接代数相减方式剔除本底噪声的影响。讨论了主要的不确定度来源,包括信号源误差、数据采集系统增益误差、幅度测量误差、幅度分辨力误差,以及测量重复性等,给出了不确定度模型。并结合一个实例,给出了交流共模抑制比的不确定度评价结果。It is described that the uncertainty of evaluation results of AC common mode rejection ratio(CMRR)of data acquisition systems(DAS)by using averaging methods,the interference is calculated by using the means of the absolute sampling data,and the base noise is also calculated as the same method.Then the base noise is cancelled from interference by using direct picking out,and the courses of analysis and evaluation of uncertainty is discussed.Some error sources of CMRR evaluation are discussed,including the signal errors,the gain errors of DAS,the amplitude measuring errors of DAS,the resolution of DAS,the repeatability errors,and the others.The uncertainty model of CMRR of DAS is given out.Combine with an example of experiment,the uncertainty evaluation results of CMRR by using the proposed method is presented.

关 键 词：计量学 交流共模抑制比 不确定度 评价 校准 数据采集系统 

分 类 号：TB973[一般工业技术—计量学]