电子天平示值误差测量不确定度分析与评定

Analysis and Evaluation of Uncertainty in Measurement of Indication Error of Electronic Balance

依据JJG 1036-2022《电子天平检定规程》,在对电子天平检定基本情况进行描述后,建立了检定电子天平时的数学模型并将灵敏度系数进行了描述,根据实际使用环境、人员、标准器、操作程序等对检定电子天平不确定度的贡献,对电子天平(以最大秤量500g的电子天平为例)测量过程中的不确定度来源进行了分析评定,并对这些不确定度分量进行了合成,求出了最大秤量500g电子天平在500g点测量时的合成标准不确定度和扩展不确定度以及有效自由度。其它相关的电子天平及其它秤量点和测量结果,一般可参照使用本次测量不确定度的评定方法进行评定。

In accordance with JJG 1036-2022 Verification Regulation for Electronic Balances,after describing the basic situation of electronic balance verification,a mathematical model for verifying electronic balances is established and the sensitivity coefficient is described.Based on the contributions of actual use environment,personnel,standards,and operating procedures to the uncertainty of verifying electronic balances,the sources of uncertainty in the measurement process of an electronic balance(taking an electronic balance with a maximum weighing of 500 grams as an example)were analyzed and evaluated,and these uncertainty components were synthesized to obtain the combined standard uncertainty,expanded uncertainty,and effective degree of freedom of the electronic balance with a maximum weighing of 500 grams at the 500 g point.