测量不确定度,即根据所用到的信息,表征赋予被测量值分散性的非负参数。测量不确定度一般由若干分量组成。其中一些分量可根据一系列测量值的统计分布,按测量不确定度的A类评定;而另一些分量则可根据基于经验或其他信息获得的概率密度函数,按测量不确定度的B类进行评定,两者均可用标准偏差表征。由于测量误差的存在,一切测量结果都不可避免地存在着不确定度。当测定结果在标准值附近,检测委托者索要不确定度时,实验室在报 The uncertainty is measured by characterizing the non-negative parameters that give the measured value dispersion according to the information used. The measurement uncertainty generally consists of several components. Some of these components can be classified according to the class A of the measurement uncertainty based on the statistical distribution of a series of measured values, while others can be evaluated according to the probability density function obtained from experience or other information, in accordance with the category B of measurement uncertainty Assessment, both can be characterized by standard deviation. Due to the measurement error, all the measurement results inevitably have the uncertainty. When the measurement results in the vicinity of the standard value, testing commissioned by the request of uncertainty, the laboratory reported