差阻式读数仪校准方法的研究及不确定度分析  

Study on Calibration Method of Differential Resistor Reading Instrument and Uncertainty Analysis

作　　者：何浩鹏[1,2] 张鑫 HE Hao-peng;ZHANG Xin(Key Laboratory of Earthquake Geodesy,Institute of Seismology,CEA,Wuhan,Hubei 430071,China;Wuhan Seismic Metrological Verification&Suveying Engineering Institue CO.,LTD,Wuhan,Hubei 430072,China)

机构地区：[1]中国地震局地震研究所(中国地震局地震大地测量重点实验室),湖北武汉430071 [2]武汉地震计量检定与测量工程研究院有限公司,湖北武汉430071

出　　处：《计量学报》2020年第S01期162-166,共5页Acta Metrologica Sinica

基　　金：湖北省地方计量规范制定项目《差阻式读数仪校准规范》;中国地震局地震研究所和地壳应力研究所基本科研业务费专项资助项目(IS201816275)。

摘　　要：针对目前仅有的测量方法不能满足高准确度、全量程差阻式读数仪的校准需求,提出采用数字多用表作为量值标准,使用比较法对其电阻比与电阻和示值误差进行校准,并对电阻比示值误差测量结果进行不确定度分析,其扩展不确定度为6×10-5(k=2);利用在校准电路中加入可变电阻的方式测量芯线电阻对示值的影响,以提高测量结果准确度。同时,对数字多用表开展四线制电阻线性度实验,以分析数字多用表作为量值标准的可靠性,进而验证校准方法的科学性。In view of the fact that the only measurement method can not meet the calibration requirements of high accuracy and full range differential resistor reading instrument,the digital multimeter is proposed as the measurement standard,and the comparison method is used to calibrate the resistance ratio indication error,resistance indication error.The uncertainty of measurement results of resistance ratio indication error is analyzed,and the expanded uncertainty is 6×10-5(k=2).In order to improve the accuracy of measurement results,the method of adding variable resistance into the calibration circuit is used to measure the influence of core wire resistance on indication value.At the same time,the four wire resistance linearity experiment is carried out to analyze the reliability of DMM as the measurement standard,and then verify the scientificity of calibration method.

关 键 词：计量学 差阻式读数仪 数字多用表 电阻比 校准 不确定分析 

分 类 号：TB971[一般工业技术—计量学]