合成标准不确定度

本文叙述了测量不确定度评定的基本程序，A类和B类标准不确定度、合成标准不确定度和扩展不确定度评定的基本方法。

Basic procedures for evaluation of uncertainty , type A and B evaluation of standard uncertainty , evaluation of combined standard uncertainty , and evaluation of expanded uncertainty are recounted .

利用MATLAB进行随机模拟，根据直接测量量的有关信息，对其误差进行仿真，然后求出被测量的估计值，利用统计方法计算合成标准不确定度。

The software MATLAB is used to carried out stochastic simulation of the error based on measurement information , then the estimate of the measurand can be obtained and the combined standard uncertainty can be calculated using statistical methods .

文中介绍了不确定度的分析原理，包括建立不确定度分析模型，对不确定度分量进行A类或B类评定的方法，合成标准不确定度及扩展不确定度的计算方法等。

This manuscript introduces the analysis compendium of uncertainty which includes the establishment of uncertainty analysis models , the assessment method of uncertainty components in type A and type B , and the calculation of normal combined uncertainty and extended uncertainty .

介绍了不确定度的有关概念，提出了不确定度A类分量及B类分量评定的方法以及在两种分量下合成标准不确定度的表达式。

In this article , the relevant concepts of the indetermination degree , the assessed method towards indetermination degree A and B weights , and the formulae on the indetermination degree of synthesizing standard under the two kinks of weights were introduced .

结果表明，重复性实验校正因子f是近海水质总汞测定中不确定度的主要来源；东海近海水质总汞测定中的相对合成标准不确定度约为0.16。

The results showed that the main effective factor of uncertainty of mercury measurement was the repetitive correction factor f , and the relative combined standard uncertainty mercury in offshore water in East China Sea was about 0.16 .

维生素B2平均加标回收率为94.0%，维生素B2相对标准偏差为0.44%，合成标准不确定度为4.917×10-3。

The recovery of spiked samples was 94.0 % , and the relative standard deviation was 0.44 % . Compound normative incertitude was 4.917 × 10 ~ ( - 3 ) .

本文介绍用M1级砝码检定/校准电子台秤的工作中，怎样分析不确定度来源，计算各分量的标准不确定度、合成标准不确定度以及扩展不确定度的方法。

This article introduced how to analyze uncertainty source in the work of class M1 weight verification / calibration electric platform scale , calculates various heft method of standard uncertainty , synthesis standard uncertainty and expansion uncertainty .

经过几年的研制，标准物质达到了任务书技术指标要求：防老剂BHT标准物质的纯度为99.1，合成标准不确定度为0.5%；

With three years development , standard reference materials of antioxidant BHT has achieved the technology target of task book requirements : The purity of antioxidant BHT SRM is 99.1 ± 0.5 % ;

计算得水中氯化物含量测定结果的相对合成标准不确定度为3.49×10-3。

The related combined standard uncertainty is 3.49 × 10 - 3 .

使用合成标准不确定度公式应注意的问题

Problems of Applying the formula of Uncertainty of Synthetical Standards

合成标准不确定度评定中相关性的讨论

Discussion of correlation for the combined standard uncertainty evaluation

对各不确定度分量进行了计算，求得合成标准不确定度和扩展不确定度分别为0.0026、0.005mg/kg。

The combined standard uncertainty and expanded uncertainty were 0.002 6 , 0.005 mg / kg respectively .

在此基础上，计算了东海近海水质油类测定中的相对合成标准不确定度约为0.12。

According to it , the relative combined standard uncertainty of oil measurements is calculated , about 0.12 .

结合这些影响因素，评估了脉宽测量的合成标准不确定度和扩展不确定度。

According to these effect factors , the combined standard uncertainty and expanded uncertainty of pulse width measurement are evaluated .

阐述了不确定度理论的含义、分类，介绍了直接测量量和间接测量量的合成标准不确定度。

Goes into particular meanings and class of uncertainty , concretely introduced direct measurement and indirect measurement of Synthetic criterion uncertainty .

实验表明，该直流电压标准的合成标准不确定度为18×10-8。

Through experiment it is verified that the combined standard uncertainty of the standard is 1 8 × 10 - 8 .

采用相对合成标准不确定度的评估方法，对用开尔文法测量铜合金导电率结果的不确定度进行了评估。

We adopt the method of the relative composite standard uncertainty for estimating the uncertainty of copper alloy electric-conductivity measured by Kelvin method .

两种不同原理纯度检测方法联合检测定值结果为N-苯基-β-萘胺标准物质的纯度为99.3%，合成标准不确定度为0.5%。

Then the value of SRM of N-phenyl - β - naphthylamine is 99.3 % and the combined standard uncertainty is 0.5 % .

普通物理实验数据处理时几乎都要使用合成标准不确定度公式，计算测量结果的不确定程度。

The formula of uncertainty of synthetical standards is used with data processing in college physics experiments to calculate the uncertainty of survey results .

相对比对法的校准范围为10-6～10-10Pa·m3/s，相对合成标准不确定度为小于25%。

The relative comparison method is 10 6 ~ 10 10 Pa · m 3 / s , and the comparative compound standard uncertainty is less than 25 % .

但如果不知道有效自由度是否大于10，而直接取扩展不确定度等于两倍的合成标准不确定度是存在疑虑的。

But if we are not sure about whether the effective freedom degree is more than 10 , it is doubtful that selecting expanded uncertainty as twice as combined standard uncertainty .

当食盐中碘含量为45.86mg/kg时，合成标准不确定度为0.21mg/kg，扩展不确定度为0.42mg/kg。

When the result of iodin content in table salt was 45.86 mg / kg , the combined uncertainty was 0.21 mg / kg , and the expanded uncertainty was 1.6 mg / kg .

并通过对电能表检验装置的误差测试来分析电能表检验装置的测量不确定度，从而给出电能表检验装置的合成标准不确定度和扩展不确定度。

We discussed also the measurement uncertainty of verification equipment for electrical energy meters through error measurement of the verification equipment for electrical energy meters , obtained combined standard uncertainty and expanded uncertainty for verification equipment of electrical energy meters .

通过对测量重复性、滴定管、移液管、标准溶液浓度等影响测量结果的不确定度分量的分析和量化，求得水中高锰酸盐指数测定结果的相对合成标准不确定度为1.10×10-2。

By analyzing and quantifying the uncertainty components of the measurement results , including repeatability of measurement results , burette , suction pipe , the concentration of standard solution , etc. , the related combined standard uncertainty is 1.10 × 10 - 2 .

当出现输入量估计值相关时，不论是线性还是非线性函数关系，在合成标准不确定度评定中，均可通过数学模型的变化或是分组合成而不去评定相关系数使计算大大地简化。

When correlation arises in estimated value of input quantity , in the assessment of uncertainty of combined standards , the computation of linear or non-linear functional relationship may be greatly simplified by changing the mathematical models or using analytical synthesis instead of assessing the related coefficients .

校准装置复合了分流法、压力衰减法和直接测量法对真空规进行校准，压力校准范围为10-1Pa~10-10Pa，合成标准不确定度为0.41%~3.5%。

The calibration technique integrates three methods available : flow separation , pressure attenuation , and direct measurenment , to calibrate the vacuum gauge . The gauge calibration ranges from 10-1 Pa to 10-10 Pa with a combined standard uncertainty in the range of 0.41 % ~ 3.5 % .