UNCERTAINTY ESTIMATE OF COMBINATION OF VERIFIED WEIGHTS |
---|
Zoltan Zelenka |
- Abstract:
- Weights are frequently used in combinations. In most cases it is assumed that weights of the same set have large covariances. The safest approach is to assume that the correlation coefficient is equal to one. However, this may lead to an overestimation of the combined uncertainty. A model can be constructed, based on the calibration/verification method suggested by the OIML (Organisation Internationale de Métrologie Légale), to avoid the unnecessary overestimation of the combined uncertainty. The model suggests that the uncertainty of combinations of weights with the same nominal value can be easily calculated to reduce the combined uncertainty. It also explains that magnitude of the correlation among weights with different nominal values depends on the accuracy class of the weights.
- Keywords:
- correlation, uncertainty, weights
- Download:
- PWC-2003-TC8-022.pdf
- DOI:
- -
- Event details
- Event name:
- XVII IMEKO World Congress
- Title:
Metrology in the 3rd Millennium
- Place:
- Dubrovnik, CROATIA
- Time:
- 22 June 2003 - 28 June 2003