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CCL Sub-group on key comparisons
CCL summary
General information
CCL members
CCL working groups
CCL publications and bibliography
Recommended values of standard frequencies
CCL key comparison portfolio
DimVIM: Multilingual CMC classification scheme
Presentation by Dr Sacconi at the 24th meeting of the CGPM
Photographs of the CCL
Key comparisons
Open access
CCL documents
CCL-CCTF documents
CCL-WG documents
Restricted access  
CCL working documents
CCL-CCTF documents
CCL-WG documents
MePWG documents
Direct access

Task description

  • to coordinate, supervise and support the administrative process of the pilot laboratories in conducting key comparisons;


  • to examine all relevant documents for each key comparison, starting with the protocol and ending with the Draft B report;


  • to advise the pilot laboratory in preparing the text of the entry to Appendix B of the CIPM MRA as required, including the calculation of degrees of equivalence and linking, and to prepare a recommendation on these subjects for approval by the CCL;


  • to prepare guidance documents on identifying significant deviations for use by the pilot laboratories; and


  • to advise the pilot laboratory in preparing a comparison status document, and to prepare a recommendation for this summary for the CCL.
Chair: A. Lewis, NPL
Members: DG moderators, RMO TCL chair persons, KC pilots