138033～27316K温度国家基准的不确定度评定

The Analysis of Uncertainty of the Primary Standard of Temperature from 13.803 3 K to 273.16 K

本文依据国家质量技术监督局发布的中华人民共和国计量技术规范JJF10 59- 1999《测量不确定度评定与表示》 ,对 1992年完成的 13 80 33～ 2 73 16K温度国家基准重新作不确定度评定。本文讨论了不确定度的来源 ;分析了标准不确定度、有效自由度、不确定度的合成、扩展不确定度及范围因子 ;计算了国家基准铂电阻温度计在整个温度范围内的不确定度分布。结果表明 ,各个定义固定点的复现性不大于 ± 0 1mK ,在置信水平为 99%和各自给定的有效自由度下 ,各个固定点实现的扩展不确定度不大于 1mK。基准铂电阻温度计的扩展不确定度分布不大于 1 6mK。

The uncertainty of the primary standard of temperature from 13 803 3 K to 273 16 K is analyzed according to the uncertainty evaluation and expression. The standard uncertainty, expanded uncertainty, coverage factor, degrees of freedom and expanded uncertainty distribution of SPRT in all the temperature range are discussed. The results show that each expanded uncertainty of all the defining fixed points is not larger than 1 mK and reproducibility agrees to within ±0 1 mK. The expanded uncertainty distribution of SPRT is not larger than 1 6 mK.