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The BIPM key comparison database (KCDB) is defined in the text of the CIPM MRA as "the database maintained by the BIPM (Bureau International des Poids et Mesures) which contains Appendices A, B, C and D of the Mutual Recognition Arrangement".
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- 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 institutes.
- Appendix D: List of key comparisons
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