Calibration and Measurement Capabilities – CMCs
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Key and supplementary comparisons
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Added keywords act as an additional filter. Keywords separated by a space will be treated by the logical function AND automatically. You may also use OR. Keyword searches also find close matches. Placing quotation marks (") before and after the search word, e.g. "word", will allow for exact matches.

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News
5 OCTOBER 2022
Key Comparison - CCQM-K156
The results of CCQM-K156 have been published in the KCDB. This is a comparison of the mass fraction of PFOA (Perfluorooctanoic Acid) and PFOS (Perfluorooctane Sulfonate) in ground water, in which 7 institutes participated. Both compounds persist for a long time before breaking down and are harmful for humans and wildlife.
4 OCTOBER 2022
FIBRE OPTICS - SIM
5 new CMCs in Fibre Optics have been published in the KCDB for Costa Rica via SIM, in the field of Photometry and Radiometry.
4 OCTOBER 2022
Electricity and Magnetism - EURAMET
8 revised CMCs in Electricipty and Magnetism have recently been published in the KCDB for Belgium, Finland, Italy and Poland via EURAMET.
27 SEPTEMBER 2022
Continuous comparison SIR Ce-139 - BIPM
The most recent results achieved via the continuous comparison BIPM.RI(II)-K1.Ce-139  have been published including new results obtained by  LNE-LNHB (France) and NMISA (South Africa). Ce-139 is notably used as a source for spectrometer calibrations. This report represents the first key comparison report embedding machine-readable (XML and JSON) versions of the document. Use of the PDF/A-3 standard in this way was originally suggested by METAS (Switzerland) in the context of Digital Calibration Certificates. The recent update of the BIPM.RI(II)-K1.Ce-139 comparison – using the BIPM's International Reference System (SIR) for radionuclide metrology – provided an opportunity to introduce this approach for the first time in reporting a key comparison. (see also https://www.bipm.org/en/-/2022-09-30
Statistics
Currently in the KCDB there are
250 CIPM MRA participants
1134 key comparisons
25919 CMCs
664 supplementary comparisons