The Consultative Committee for the Definition of the Second (CCDS) was set up in 1956. Its name was changed to Consultative Committee for Time and Frequency (CCTF) by the CIPM in 1997.
Present activities concern matters related to the definition and realization of the second, establishment and diffusion of International Atomic Time (TAI) and Coordinated Universal Time (UTC), and advice to the CIPM on matters related to time and time scales.
CCTF Working Group on Coordination of the Development of Advanced Time and Frequency Transfer Techniques
List of meetings
Meetings and related documents
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The new BIPM website
The BIPM is proud to present its new website, with an updated design and personalized content. Those entitled to access restricted documents will need to set up a personal password: click on SIGN IN in the header, then on Password forgotten and enter your email address as registered in the BIPM Meetings Office database.
Announcement of the 20th International Congress of Metrology (CIM 2021)
The 20th International Congress of Metrology, CIM 2021, will be held from 28-30 September 2021 in Paris (France). The congress will explore scientific and industrial challenges in the field of measurement through a varied programme.
The BIPM and ITU formalized their long-standing cooperation through the signature of an MoU
The BIPM-ITU Memorandum of Understanding was signed electronically by Dr Wynand Louw, President of the CIPM on 29 June 2020, and by Mr Mario Maniewizc, Director of ITU Radiocommunication Bureau on 30 June 2020.