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sWG-CMC: Sub-group on CMCs and the DimVIM
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 establish and maintain lists of service categories (DimVIM) and, where necessary, rules for the preparation of CMC entries (DimVIM Guide);


  • to agree on detailed technical review criteria;


  • to coordinate and, where possible, conduct inter-regional reviews of CMCs submitted by RMOs for posting in Appendix C of the CIPM MRA;


  • to provide guidance on the range of CMCs supported by particular key comparisons;


  • to identify areas where additional key and supplementary comparisons are needed; and


  • to coordinate the review of existing CMCs in the context of new results of key and supplementary comparisons.
Chair: O. de Oliveira, INMETRO
Members: RMO TCL chairpersons
DimVIM: CMC classification scheme (multiple languages)