计量学报2016，Vol.37Issue(3)：265-270,6.DOI:10.3969/j.issn.1000-1158.2016.03.09
高精密测温电桥的标定与评估
Calibration and Evaluation on High PreCision Thermometry Bridge
摘要
Abstract
The RTU and RBC were used to calibrate and evaluate the F900 high precision thermometry bridge in the middle temperature primary standard laboratory of the National Institute of Metrology,and the effect of different frequency and output current on its measurement accuracy was analyzed in the temperature range of long-stem standard platinum resistance thermometer. The results show that the accuracy is obvious difference when the bridge works in different frequency. When the frequency is 25 Hz,the maximum measurement deviations in the calibration of RTU and RBC are about 0. 01 mK and 0. 06 mK. When the frequency is 75 Hz,the maximum measurement deviations of the calibration are about 0. 08 mK and 0. 2 mK,and it has made significant drift compared to that of the factory. Differences in accuracy is very small when the bridge works at different output current,less than 15μK. The results using RTU and RBC to calibrate F900 can confirm each other,and provide data to the uncertainty evaluation in reproduction process of the fixed-point temperature reference.关键词
计量学/测温电桥/电阻比率/RTU/RBC/测量偏差Key words
metrology/thermometry bridge/resistance ratio/RTU/RBC/measurement deviation分类
通用工业技术引用本文复制引用
方信昀,孙建平,曾凡超,王伟,张俊峰..高精密测温电桥的标定与评估[J].计量学报,2016,37(3):265-270,6.基金项目
国家自然科学基金 （）
