Accreditation and Quality Assurance

, Volume 6, Issue 7, pp 290–294

Uncertainty calculations in the certification of reference materials 4. Characterisation and certification

Authors

  • Adriaan M. H. van der Veen
    • Nederlands Meetinstituut, Schoemakerstraat 97, 2600 AR Delft, The Netherlands e-mail: avdveen@nmi.nl Tel.: +31-15-2691 733 Fax: +31-15-2612 971
  • Thomas P. J. Linsinger
    • European Commission, Joint Research Centre, Institute for Reference Materials and Measurements, Retieseweg, 2440 Geel, Belgium e-mail: Jean.Pauwels@irmm.jrc.be Tel.: +32-14-571 722 Fax: +32-14-590 406
  • Heinz Schimmel
    • European Commission, Joint Research Centre, Institute for Reference Materials and Measurements, Retieseweg, 2440 Geel, Belgium e-mail: Jean.Pauwels@irmm.jrc.be Tel.: +32-14-571 722 Fax: +32-14-590 406
  • Andree Lamberty
    • European Commission, Joint Research Centre, Institute for Reference Materials and Measurements, Retieseweg, 2440 Geel, Belgium e-mail: Jean.Pauwels@irmm.jrc.be Tel.: +32-14-571 722 Fax: +32-14-590 406
  • Jean Pauwels
    • European Commission, Joint Research Centre, Institute for Reference Materials and Measurements, Retieseweg, 2440 Geel, Belgium e-mail: Jean.Pauwels@irmm.jrc.be Tel.: +32-14-571 722 Fax: +32-14-590 406
General Paper

DOI: 10.1007/PL00010459

Cite this article as:
van der Veen, A., Linsinger, T., Schimmel, H. et al. Accred Qual Assur (2001) 6: 290. doi:10.1007/PL00010459

Abstract 

The main objective of the certification of a reference material is to determine its property values including their uncertainty. In the previous parts of this series, the basis for the evaluation of measurement uncertainty of the property values has been examined, including the conversion of homogeneity and stability study data into standard uncertainties. In this final part, the determination of the property values and the modelling of the certification process is discussed. It is noted that the characterisation of a reference material can be modelled in some cases using analysis of variance statistics, but a more generally applicable model can be developed based on χ2-fitting. Furthermore, it is concluded that there is an advantage in using absolute standard uncertainties instead of relative ones when modelling the certification process.

Keywords CRMsMeasurement uncertaintyHomogeneity studyStability studyCertification

Copyright information

© Springer-Verlag Berlin Heidelberg 2001