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