数据采集系统输入电阻的不确定度分析与评定  

Analysis and evaluation of measurement uncertainty of input resistance of data acquisition systems

作　　者：梁志国[1] 冯秀娟[2] LIANG Zhiguo;FENG Xiujuan(National Key Laboratory of Metrology and Calibration Technology,Changcheng Institute of Metrology&Measurement,Beijing 100095,China;Division of Mechanics and Acoustics,National Institute of Metrology,China,Beijing 100029,China)

机构地区：[1]航空工业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：《计测技术》2023年第5期97-103,共7页Metrology & Measurement Technology

基　　金：国家市场监管总局规范修订项目(2021-237)。

摘　　要：针对输入电阻的测量误差常常偏大的问题,分析了物理机理和实际原因。讨论了影响输入电阻测量不确定度的几个主要因素,包括标准电压、测量电压、标准电阻取值及误差的影响等,给出了降低输入电阻测量不确定度的主要措施,即标准电阻与输入电阻的量值越接近越好,两者应处于同一数量级,并且两个不同的激励电压差异应该尽量大。通过实例给出了输入电阻测量不确定度的评价结果,表明了该过程的正确性和切实可行性。Aiming at the problem of large measurement errors in input resistance,the physical mechanism and practical reasons were analyzed.Several main factors affecting the uncertainty of input resistance measurement were discussed,including standard voltage,measurement voltage,standard resistance value and error,and so on.The main mea-sures to reduce the uncertainty of input resistance measurement were given,that is,the closer the value of standard resistance and input resistance,the better,and the two should be in the same order of magnitude,moreover,the difference between two different excitation voltages should be as large as possible.The evaluation results of input resistance measure-ment uncertainty are provided through an example,and both the correctness and feasibility of the process are proved.

关 键 词：输入电阻 数据采集系统 不确定度分析 评价 校准 

分 类 号：TB971[一般工业技术—计量学]