CCM Task Group on the Phases for the Dissemination of the kilogram following redefinition (CCM-TGPfD-kg)

Terms of reference

The dissemination of the kilogram after 20 May 2019 is taking place in three consecutive phases:

• Traceability to the IPK (but taking into account the additional uncertainty coming from the new definition) (May 2019 to February 2021),
• Dissemination of the consensus value (from February 2021),
• Dissemination of individual realizations (in the future).

Based on "the mise en pratique of the definition of the kilogram" and on "the CCM detailed note on the dissemination process after the redefinition of the kilogram" the task group will:

• Ensure the correct implementation of traceability across the period of the redefinition of the kilogram,
• Implement the calculation of the consensus value of the kilogram and its uncertainty,
• Implement and review methods to maintain the best possible stability of the consensus value over time (including comparison periodicity),
• Propose clear criteria for moving from the consensus value dissemination phase to the individual realization dissemination phase,
• Maintain detailed documents describing the transition through the phases of the dissemination, the consensus value and other relevant information related to the dissemination of the kilogram,
• Provide advice to the CCM-WGM in all questions regarding traceability of the kilogram during the first two phases above, and in preparation for the final phase.