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

The organizational structure of the CIPM MRA is indicated in Figure 1 and the scheme for key comparisons is shown in Figure 2. Each of these figures is for illustrative purpose only; the text of the CIPM MRA and the policy document Measurement comparisons in the CIPM MRA should be consulted for full details.

The Regional Metrology Organizations (RMOs) play an important role in the CIPM MRA. They have responsibility for carrying out key comparisons within their regions, they carry out supplementary comparisons and other actions to support mutual confidence in the validity of calibration and measurement certificates of their member NMIs and are responsible for coordinating, through the JCRB, the entries into Appendix C of the MRA of the calibration and measurement capabilities of their member NMIs.

Figure 1. An outline of the organization of the CIPM MRA.


Organization of the MRA
JCRB Appendix B Appendix C Key Comparison Database

Figure 2. The scheme for key comparisons.


Scheme for key comparisons

National metrology institute (NMI) participating in CIPM key comparisons
NMI participating in CIPM key comparisons and in regional metrology organization (RMO) key comparisons
NMI participating in RMO key comparisons
NMI participating in ongoing BIPM key comparisons
NMI participating in a bilateral key comparison
International organization signatory to the MRA

Summary
Organizational structure of the CIPM MRA
The BIPM key comparison database
Ongoing comparisons conducted by the BIPM
CIPM MRA docs.
Policy documents
Guidance on CMCs
Guidance on comparisons
Complementary info.
Use of the CIPM MRA logo
See also: JCRB