– the intergovernmental organization through which Member States act together
     on matters related to measurement science and measurement standards.
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Text of the CIPM MRA

  • Appendix A: List of national metrology institutes that are signatories to the arrangement

  • Appendix B
    For each key comparison the following are included:
    • individual values for each institute, together with their declared uncertainties;
    • the key comparison reference value with its associated uncertainty;
    • for each institute, the deviation from the key comparison reference value and the uncertainty in that deviation (at a 95 % level of confidence), i.e. its degree of equivalence;
    • the degrees of equivalence between the standards of each of the participating institutes.

  • Appendix C: Quantities for which calibration and measurement certificates are recognized by institutes participating in part two of the agreement. The quantities, ranges and calibration and measurement capabilities expressed as an uncertainty (normally at a 95 % level of confidence) are listed for each participating institute.

  • Appendix D: List of key comparisons

  • Appendix E: Terms of reference of the Joint Committee of the Regional Metrology Organizations and the BIPM (JCRB)
CIPM MRA docs.
Policy documents
Guidance on CMCs
Guidance on comparisons
Complementary info.
Use of the CIPM MRA logo
See also: JCRB