CCTF - BIPM

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=> { Liferay.Util.showCapsLock( event, '_com_liferay_login_web_portlet_LoginPortlet_passwordCapsLockSpan' ); }); } } })(); </script><script> </script> </div> </div> </div> </section> </div> </div> </div> </div> </div> </div> <div class="modal fade modal-full modal-metrology" id="second-nav-metrology" tabindex="-1" role="dialog" aria-hidden="true"> <div class="modal-dialog modal-full__dialog" role="document"> <div class="modal-content modal-full__content"> <div class="container"> <div class="row"> <div class="col-12 col-lg-2"> <button type="button" class="close modal-full__close" data-dismiss="modal" aria-label="Close"> <img src="https://www.bipm.org/o/bipm-theme/images/picto/picto-close.svg" /> </button> </div> <div class="col-12 col-lg-10"> <div id="secondary-nav" class="header-second-nav"> <ul class="header-second-nav__list"> <li class="header-second-nav__items header-second-nav__items--connexion connexion"> <div class="sign-in-header" data-dismiss="modal" data-toggle="modal" 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href="http://liferay.bipm.org:8080/en/people?userId=3340064" role="menuitem">BIPM contact: Dr Gianna Panfilo</a> </li> </ul> </li> <li class="lfr-nav-item nav-item dropdown" id="layout_com_liferay_site_navigation_menu_web_portlet_SiteNavigationMenuPortlet_INSTANCE_navigation_metrology_58843" role="presentation"> <a aria-haspopup='true' class="nav-link text-truncate dropdown-toggle" href='https://www.bipm.org/en/metrology/em' role="menuitem"> <span class="text-truncate"> EM : Electricity and Magnetism <span class="lfr-nav-child-toggle"><i class="icon-caret-down"></i></span></span> </a> <ul aria-expanded="false" class="child-menu dropdown-menu" role="menu"> <li class="" id="layout_com_liferay_site_navigation_menu_web_portlet_SiteNavigationMenuPortlet_INSTANCE_navigation_metrology_909722" role="presentation"> <a class="dropdown-item" href="https://iopscience.iop.org/journal/0026-1394/page/Focus_on_Electrical_Metrology" role="menuitem">Metrologia: Focus on Metrology in Electricity and Magnetism</a> </li> <li class="" id="layout_com_liferay_site_navigation_menu_web_portlet_SiteNavigationMenuPortlet_INSTANCE_navigation_metrology_2437203" role="presentation"> <a class="dropdown-item" href="https://www.bipm.org/en/committees/cc/ccem" role="menuitem">CCEM</a> </li> <li class="" id="layout_com_liferay_site_navigation_menu_web_portlet_SiteNavigationMenuPortlet_INSTANCE_navigation_metrology_855484" role="presentation"> <a class="dropdown-item" href="http://liferay.bipm.org:8080/en/people?userId=38861" role="menuitem">BIPM contact: Dr Michael Stock</a> </li> </ul> </li> <li class="lfr-nav-item nav-item dropdown" id="layout_com_liferay_site_navigation_menu_web_portlet_SiteNavigationMenuPortlet_INSTANCE_navigation_metrology_58847" role="presentation"> <a aria-haspopup='true' class="nav-link text-truncate dropdown-toggle" href='https://www.bipm.org/en/metrology/l' role="menuitem"> <span class="text-truncate"> L: Length <span class="lfr-nav-child-toggle"><i class="icon-caret-down"></i></span></span> </a> <ul aria-expanded="false" class="child-menu dropdown-menu" role="menu"> <li class="" id="layout_com_liferay_site_navigation_menu_web_portlet_SiteNavigationMenuPortlet_INSTANCE_navigation_metrology_2437205" role="presentation"> <a class="dropdown-item" href="https://www.bipm.org/en/committees/cc/ccl" role="menuitem">CCL</a> </li> <li class="" id="layout_com_liferay_site_navigation_menu_web_portlet_SiteNavigationMenuPortlet_INSTANCE_navigation_metrology_855496" role="presentation"> <a class="dropdown-item" href="http://liferay.bipm.org:8080/people?userId=3340064" role="menuitem">BIPM contact: Dr Gianna Panfilo</a> </li> </ul> </li> <li class="lfr-nav-item nav-item dropdown" id="layout_com_liferay_site_navigation_menu_web_portlet_SiteNavigationMenuPortlet_INSTANCE_navigation_metrology_58851" role="presentation"> <a aria-haspopup='true' class="nav-link text-truncate dropdown-toggle" href='https://www.bipm.org/en/metrology/m' role="menuitem"> <span class="text-truncate"> M: Mass and related quantities <span class="lfr-nav-child-toggle"><i class="icon-caret-down"></i></span></span> </a> <ul aria-expanded="false" class="child-menu dropdown-menu" role="menu"> <li class="" id="layout_com_liferay_site_navigation_menu_web_portlet_SiteNavigationMenuPortlet_INSTANCE_navigation_metrology_2437206" role="presentation"> <a class="dropdown-item" href="https://www.bipm.org/en/committees/cc/ccm" role="menuitem">CCM</a> </li> <li class="" id="layout_com_liferay_site_navigation_menu_web_portlet_SiteNavigationMenuPortlet_INSTANCE_navigation_metrology_909868" role="presentation"> <a class="dropdown-item" href="https://www.bipm.orgliferay.bipm.org:8080/people?userId=663416" role="menuitem">BIPM contact: Dr Hao Fang</a> </li> </ul> </li> <li class="lfr-nav-item nav-item" id="layout_com_liferay_site_navigation_menu_web_portlet_SiteNavigationMenuPortlet_INSTANCE_navigation_metrology_58855" role="presentation"> <a class="nav-link text-truncate" href='https://www.bipm.org/en/metrology/pr' role="menuitem"> <span class="text-truncate"> PR: Photometry and Radiometry </span> </a> </li> <li class="lfr-nav-item nav-item dropdown" id="layout_com_liferay_site_navigation_menu_web_portlet_SiteNavigationMenuPortlet_INSTANCE_navigation_metrology_58859" role="presentation"> <a aria-haspopup='true' class="nav-link text-truncate dropdown-toggle" href='https://www.bipm.org/en/metrology/qm' role="menuitem"> <span class="text-truncate"> QM: Chemistry and Biology <span class="lfr-nav-child-toggle"><i class="icon-caret-down"></i></span></span> </a> <ul aria-expanded="false" class="child-menu dropdown-menu" role="menu"> <li class="" id="layout_com_liferay_site_navigation_menu_web_portlet_SiteNavigationMenuPortlet_INSTANCE_navigation_metrology_2437010" role="presentation"> <a class="dropdown-item" href="https://www.bipm.org/en/people" role="menuitem">People</a> </li> </ul> </li> <li class="lfr-nav-item nav-item" 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Time and Frequency <span class="lfr-nav-child-toggle"><i class="icon-caret-down"></i></span></span> </a> <ul aria-expanded="false" class="child-menu dropdown-menu" role="menu"> <li class="active selected" id="layout_com_liferay_site_navigation_menu_web_portlet_SiteNavigationMenuPortlet_INSTANCE_navigation_metrology_2437208" role="presentation"> <a class="dropdown-item" href="https://www.bipm.org/en/committees/cc/cctf" role="menuitem">CCTF</a> </li> <li class="" id="layout_com_liferay_site_navigation_menu_web_portlet_SiteNavigationMenuPortlet_INSTANCE_navigation_metrology_855629" role="presentation"> <a class="dropdown-item" href="http://webtai.bipm.org/database/" role="menuitem">BIPM Time Department Database</a> </li> <li class="" id="layout_com_liferay_site_navigation_menu_web_portlet_SiteNavigationMenuPortlet_INSTANCE_navigation_metrology_855487" role="presentation"> <a class="dropdown-item" href="https://www.bipm.org/en/time-ftp" role="menuitem">Time FTP Server</a> </li> <li 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<p class="header-second-nav__content">Quick links</p> <div class="header-second-nav__picto"></div> </li> <li class="header-second-nav__items header-second-nav__items--languages languages-header"> <div class="portlet-content"> <a class="language-entry-long-text" href="/fr/committees/cc/cctf"> fran莽ais </a> </div> </li> </ul> </div> </div> </div> </div> <div class="modal-body modal-full__body"> <div class="container"> <p class="modal-full__title">Quick links</p> <div class="portlet-boundary portlet-boundary_com_liferay_site_navigation_menu_web_portlet_SiteNavigationMenuPortlet_ portlet-static portlet-static-end portlet-barebone portlet-navigation " id="p_p_id_com_liferay_site_navigation_menu_web_portlet_SiteNavigationMenuPortlet_INSTANCE_navigation_quicklinks_"> <span id="p_com_liferay_site_navigation_menu_web_portlet_SiteNavigationMenuPortlet_INSTANCE_navigation_quicklinks"></span> <section class="portlet" id="portlet_com_liferay_site_navigation_menu_web_portlet_SiteNavigationMenuPortlet_INSTANCE_navigation_quicklinks"> <div class="portlet-content"> <div class=" portlet-content-container"> <div class="portlet-body"> <div id="navbar_com_liferay_site_navigation_menu_web_portlet_SiteNavigationMenuPortlet_INSTANCE_navigation_quicklinks"> <ul aria-label="Site Pages" class="nav nav-pills nav-stacked navbar-site" role="menubar"> <li class="lfr-nav-item nav-item dropdown" id="layout_3033748" role="presentation"> <a aria-labelledby="layout_3033748" aria-haspopup='true' class="nav-link text-truncate dropdown-toggle" role="menuitem"> <span class="text-truncate"> The 2018 revision of the SI <span class="lfr-nav-child-toggle"><i class="icon-caret-down"></i></span></span> </a> <ul aria-expanded="false" class="child-menu dropdown-menu" role="menu"> <li class="" id="layout_3033749" role="presentation"> <a aria-labelledby="layout_3033749" class="dropdown-item" href="https://www.youtube.com/watch?v=V7myhT_CwYc&list=PL-vj-3_a7wTDeKEupZSX7Tw42yReNgJLl&index=8&t=0s" role="menuitem">Celebrating the vote by the CGPM</a> </li> <li class="" id="layout_840479" role="presentation"> <a aria-labelledby="layout_840479" class="dropdown-item" href="https://www.bipm.org/en/cgpm-2018/" role="menuitem">26th CGPM (November 2018)</a> </li> <li class="" id="layout_3033736" role="presentation"> <a aria-labelledby="layout_3033736" class="dropdown-item" href="https://physics.nist.gov/cuu/Constants/index.html" role="menuitem">2018 values of the Fundamental Physical Constants</a> </li> <li class="" id="layout_3033751" role="presentation"> <a aria-labelledby="layout_3033751" class="dropdown-item" href="https://www.bipm.org/en/CGPM/db/26/1/" role="menuitem">Resolution 1 of the 26th CGPM (2018)</a> </li> <li class="" id="layout_924415" role="presentation"> <a aria-labelledby="layout_924415" class="dropdown-item" href="https://www.bipm.org/en/publications/si-brochure/" role="menuitem">SI Brochure (2019)</a> </li> </ul> </li> <li class="lfr-nav-item nav-item" id="layout_3401007" role="presentation"> <a aria-labelledby="layout_3401007" class="nav-link text-truncate" href='http://www.worldmetrologyday.org/' role="menuitem"> <span class="text-truncate"> World Metrology Day </span> </a> </li> <li class="lfr-nav-item nav-item" id="layout_3033738" role="presentation"> <a aria-labelledby="layout_3033738" class="nav-link text-truncate" href='https://jcgm.bipm.org/vim/en/index.html' role="menuitem"> <span class="text-truncate"> International Vocabulary of Metrology (VIM) </span> </a> </li> <li class="lfr-nav-item nav-item" id="layout_414019" role="presentation"> <a aria-labelledby="layout_414019" class="nav-link text-truncate" href='https://iopscience.iop.org/journal/0026-1394' role="menuitem"> <span class="text-truncate"> Metrologia </span> </a> </li> <li class="lfr-nav-item nav-item" id="layout_3033739" role="presentation"> <a aria-labelledby="layout_3033739" class="nav-link text-truncate" href='https://www.bipm.org/en/publications/guides/#gum' role="menuitem"> <span class="text-truncate"> Guide to the Expression of Uncertainty in Measurement </span> </a> </li> <li class="lfr-nav-item nav-item dropdown" id="layout_418284" role="presentation"> <a aria-labelledby="layout_418284" aria-haspopup='true' class="nav-link text-truncate dropdown-toggle" role="menuitem"> <span class="text-truncate"> Autres publications <span class="lfr-nav-child-toggle"><i class="icon-caret-down"></i></span></span> </a> <ul aria-expanded="false" class="child-menu dropdown-menu" role="menu"> <li class="" id="layout_3033741" role="presentation"> <a aria-labelledby="layout_3033741" class="dropdown-item" href="https://www.bipm.org/en/worldwide-metrology/cgpm/resolutions.html" role="menuitem">Resolutions of the CGPM</a> </li> <li class="" id="layout_924416" role="presentation"> <a aria-labelledby="layout_924416" class="dropdown-item" href="https://www.bipm.org/en/time-ftp" role="menuitem">Time FTP Server</a> </li> </ul> </li> <li class="lfr-nav-item nav-item" id="layout_3033737" role="presentation"> <a aria-labelledby="layout_3033737" class="nav-link text-truncate" href='https://www.bipm.org/en/cbkt/' role="menuitem"> <span class="text-truncate"> Capacity Broadening & Knowledge Transfer (CBKT) </span> </a> </li> <li class="lfr-nav-item nav-item dropdown" id="layout_3033740" role="presentation"> <a aria-labelledby="layout_3033740" aria-haspopup='true' class="nav-link text-truncate dropdown-toggle" role="menuitem"> <span class="text-truncate"> NMI Directors and Member State Representatives <span class="lfr-nav-child-toggle"><i class="icon-caret-down"></i></span></span> </a> <ul aria-expanded="false" class="child-menu dropdown-menu" role="menu"> <li class="" id="layout_924417" role="presentation"> <a aria-labelledby="layout_924417" class="dropdown-item" href="https://www.bipm.org/en/about-us/" role="menuitem">BIPM strategy document</a> </li> <li class="" id="layout_3033742" role="presentation"> <a aria-labelledby="layout_3033742" class="dropdown-item" href="https://www.bipm.org/en/about-us/member-states/" role="menuitem">Toolbox: Benefits and how to participate</a> </li> </ul> </li> <li class="lfr-nav-item nav-item" id="layout_3033743" role="presentation"> <a aria-labelledby="layout_3033743" class="nav-link text-truncate" href='https://www.bipm.org/en/committees/jc/jcrb' role="menuitem"> <span class="text-truncate"> JCRB </span> </a> </li> <li class="lfr-nav-item nav-item dropdown" id="layout_3117765" role="presentation"> <a aria-labelledby="layout_3117765" aria-haspopup='true' class="nav-link text-truncate dropdown-toggle" role="menuitem"> <span class="text-truncate"> tests <span class="lfr-nav-child-toggle"><i class="icon-caret-down"></i></span></span> </a> <ul aria-expanded="false" class="child-menu dropdown-menu" role="menu"> <li class="" id="layout_3117766" role="presentation"> <a 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class="hide-accessible sr-only">CCTF</p> <style type="text/css"> .master-layout-fragment .portlet-header { display: none; } </style> <div class="columns-1" id="main-content" role="main"> <div class="portlet-layout row"> <div class="col-md-12 portlet-column portlet-column-only" id="column-1"> <div class="portlet-dropzone portlet-column-content portlet-column-content-only" id="layout-column_column-1"> <div class="portlet-boundary portlet-boundary_committee_members_portlet_ portlet-static portlet-static-end bipm-lame-white " id="p_p_id_committee_members_portlet_"> <span id="p_committee_members_portlet"></span> <section class="portlet" id="portlet_committee_members_portlet"> <div class="portlet-content"> <div class="autofit-float autofit-row portlet-header"> <div class="autofit-col autofit-col-expand"> <h2 class="portlet-title-text">Committee members</h2> </div> </div> <div class=" portlet-content-container"> <div class="portlet-body"> <div class="list-members"> <h1 class="title-primary list-members__title">Consultative Committee for Time and Frequency (CCTF)</h1>  <div class="row"> <div class="col-12 col-lg-6"> <div class="list-members__content"> <h2 class="title-secondary title-secondary--small list-members__subtitle">President</h2> <div class="list-members-list list-members-list--single"> <div class="list-members-list__item"> <p class="list-members-list__title"><a href="/people?userId=3328934"> Dr N. Dimarcq </a></p> <div class="list-members-list__content"> <p>CNRS Senior Scientist at ARTEMIS</p> <p></p> <p>CNRS, Universit茅 C么te d'Azur, Observatoire C么te d'Azur</p> <p>France</p> </div> </div> </div> </div> </div> <div class="col-12 col-lg-6"> <div class="list-members__content"> <h2 class="title-secondary title-secondary--small list-members__subtitle">Executive Secretary</h2> <div class="list-members-list list-members-list--single"> <div class="list-members-list__item"> <p class="list-members-list__title"><a href="/people?userId=3310164"> Dr P. Tavella </a></p> <div class="list-members-list__content"> <p></p> <p></p> <p>Bureau international des poids et mesures</p> <p>France</p> </div> </div> </div> </div> </div> </div> <div class="list-members__footer"> <a class="button-primary" href="/committees/cc/cctf/members" role="button"> ALL MEMBERS </a> </div> </div> </div> </div> </div> </section> </div> <div class="portlet-boundary portlet-boundary_meetings_portlet_ portlet-static portlet-static-end bipm-lame-grey " id="p_p_id_meetings_portlet_"> <span id="p_meetings_portlet"></span> <section class="portlet" id="portlet_meetings_portlet"> <div class="portlet-content"> <div class="autofit-float autofit-row portlet-header"> <div class="autofit-col autofit-col-expand"> <h2 class="portlet-title-text">List of meetings</h2> </div> </div> <div class=" portlet-content-container"> <div class="portlet-body"> <div class="meetings-list-portlet"> <p class="title-secondary meetings-list-portlet__title"> Meetings and related documents </p> <div> </div> <div class="meetings-list"> <div class="meetings-list__item"> <div class="meetings-list__content meetings-list__content--future-event meetings-list__content--session meetings-list__content--committee"> <div class="meetings-list__header"> <p class="meetings-list__title"> <span class="meetings-list__title-calendar"></span> Upcoming Meeting </p> </div> <div class="meetings-list__informations"> <a href="/committees/cc/cctf/24-_2-2025" class="meetings-list__informations-title"> 24th meeting of the CCTF (Session II - BIPM Headquarters (S猫vres)) and CCTF Working Groups meetings from 8 to 17 September 2025 </a> <ul class="meetings-list__informations-date"> <li class="meetings-list__informations-date-date"> From 18 to 19 </li> <li class="meetings-list__informations-date-month">September</li> <li class="meetings-list__informations-date-year">2025</li> </ul> </div> <ul class="meetings-list__list"> <li> <a href="/people?userId=3310164" class="meetings-list__list-link"> <span class="meetings-list__list-link-user"></span> <span></span>Patrizia Tavella</span> </a> </li> <li> <a href="/committees/cc/cctf" class="meetings-list__list-link"> <span class="meetings-list__list-link-session"></span> <span></span>CCTF</span> </a> </li> </ul> </div> </div> <div class="meetings-list__item"> <div class="meetings-list__content meetings-list__content--session meetings-list__content--committee"> <div class="meetings-list__header"> <p class="meetings-list__title"> <span class="meetings-list__title-calendar"></span> Past Meeting </p> </div> <div class="meetings-list__informations"> <a href="/committees/cc/cctf/24-_1-2024" class="meetings-list__informations-title"> 24th meeting of the CCTF (Session I - online) </a> <ul class="meetings-list__informations-date"> <li class="meetings-list__informations-date-date"> 14, 15, 21, 22 November </li> <li class="meetings-list__informations-date-year"> 2024 </li> </ul> </div> <ul class="meetings-list__list"> <li> <a href="/people?userId=3310164" class="meetings-list__list-link"> <span class="meetings-list__list-link-user"></span> <span></span>Patrizia Tavella</span> </a> </li> <li> <a href="/committees/cc/cctf" class="meetings-list__list-link"> <span class="meetings-list__list-link-session"></span> <span></span>CCTF</span> </a> </li> </ul> </div> </div> <div class="meetings-list__item"> <div class="meetings-list__content meetings-list__content--session meetings-list__content--committee"> <div class="meetings-list__header"> <p class="meetings-list__title"> <span class="meetings-list__title-calendar"></span> Past Meeting </p> </div> <div class="meetings-list__informations"> <a href="/committees/cc/cctf/23-2022" class="meetings-list__informations-title"> 23rd meeting of the CCTF (online) </a> <ul class="meetings-list__informations-date"> <li class="meetings-list__informations-date-date"> From 29 June </li> <li class="meetings-list__informations-date-month"> to 01 July </li> <li class="meetings-list__informations-date-year">2022</li> </ul> </div> <ul class="meetings-list__list"> <li> <a href="/people?userId=3310164" class="meetings-list__list-link"> <span class="meetings-list__list-link-user"></span> <span></span>Patrizia Tavella</span> </a> </li> <li> <a href="/committees/cc/cctf" class="meetings-list__list-link"> <span class="meetings-list__list-link-session"></span> <span></span>CCTF</span> </a> </li> </ul> </div> </div> <div class="meetings-list__item"> <div class="meetings-list__content meetings-list__content--session meetings-list__content--committee"> <div class="meetings-list__header"> <p class="meetings-list__title"> <span class="meetings-list__title-calendar"></span> Past Meeting </p> </div> <div class="meetings-list__informations"> <a href="/committees/cc/cctf/22-_2-2021" class="meetings-list__informations-title"> 22nd meeting of the CCTF (Session II - online) </a> <ul class="meetings-list__informations-date"> <li class="meetings-list__informations-date-date"> From 11 to 12 </li> <li class="meetings-list__informations-date-month">March</li> <li class="meetings-list__informations-date-year">2021</li> </ul> </div> <ul class="meetings-list__list"> <li> <a href="/people?userId=3310164" class="meetings-list__list-link"> <span class="meetings-list__list-link-user"></span> <span></span>Patrizia Tavella</span> </a> </li> <li> <a href="/committees/cc/cctf" class="meetings-list__list-link"> <span class="meetings-list__list-link-session"></span> <span></span>CCTF</span> </a> </li> </ul> </div> </div> <div class="meetings-list__item"> <div class="meetings-list__content meetings-list__content--session meetings-list__content--committee"> <div class="meetings-list__header"> <p class="meetings-list__title"> <span class="meetings-list__title-calendar"></span> Past Meeting </p> </div> <div class="meetings-list__informations"> <a href="/committees/cc/cctf/22-_1-2020" class="meetings-list__informations-title"> 22nd meeting of the CCTF (Session I - online) </a> <ul class="meetings-list__informations-date"> <li class="meetings-list__informations-date-date"> From 28 to 29 </li> <li class="meetings-list__informations-date-month">October</li> <li class="meetings-list__informations-date-year">2020</li> </ul> </div> <ul class="meetings-list__list"> <li> <a href="/people?userId=3310164" class="meetings-list__list-link"> <span class="meetings-list__list-link-user"></span> <span></span>Patrizia Tavella</span> </a> </li> <li> <a href="/committees/cc/cctf" class="meetings-list__list-link"> <span class="meetings-list__list-link-session"></span> <span></span>CCTF</span> </a> </li> </ul> </div> </div> </div> <div class="list-members__footer"> <a class="button-primary" href="/committees/cc/cctf/meetings" role="button"> All meetings </a> </div> </div> </div> </div> </div> </section> </div> <div class="portlet-boundary portlet-boundary_com_liferay_journal_content_web_portlet_JournalContentPortlet_ portlet-static portlet-static-end decorate portlet-journal-content " id="p_p_id_com_liferay_journal_content_web_portlet_JournalContentPortlet_INSTANCE_qfd5REDEXa4M_"> <span id="p_com_liferay_journal_content_web_portlet_JournalContentPortlet_INSTANCE_qfd5REDEXa4M"></span> <section class="portlet" id="portlet_com_liferay_journal_content_web_portlet_JournalContentPortlet_INSTANCE_qfd5REDEXa4M"> <div class="portlet-content"> <div class="autofit-float autofit-row portlet-header"> <div class="autofit-col autofit-col-expand"> <h2 class="portlet-title-text">Online information meeting 2023 - BUTTON</h2> </div> <div class="autofit-col autofit-col-end"> <div class="autofit-section"> <div class="visible-interaction"> </div> </div> </div> </div> <div class=" portlet-content-container"> <div class="portlet-body"> <div class="" data-fragments-editor-item-id="46722-157181770" data-fragments-editor-item-type="fragments-editor-mapped-item" > <div class="journal-content-article " data-analytics-asset-id="157181768" data-analytics-asset-title="Online information meeting 2023 - BUTTON" data-analytics-asset-type="web-content"> <p><a class="button-primary" href="/committees/cc/cctf/wg/cctf-ws/2023-11-16">CCTF Online Information meeting - 2023</a></p> <i> </i> </div> </div> </div> </div> </div> </section> </div> <div class="portlet-boundary portlet-boundary_com_liferay_asset_publisher_web_portlet_AssetPublisherPortlet_ portlet-static portlet-static-end bipm-lame-white portlet-asset-publisher " id="p_p_id_com_liferay_asset_publisher_web_portlet_AssetPublisherPortlet_INSTANCE_AfprxVyjbNql_"> <span id="p_com_liferay_asset_publisher_web_portlet_AssetPublisherPortlet_INSTANCE_AfprxVyjbNql"></span> <section class="portlet" id="portlet_com_liferay_asset_publisher_web_portlet_AssetPublisherPortlet_INSTANCE_AfprxVyjbNql"> <div class="portlet-content"> <div class="autofit-float autofit-row portlet-header"> <div class="autofit-col autofit-col-expand"> <h2 class="portlet-title-text">Asset Publisher</h2> </div> </div> <div class=" portlet-content-container"> <div class="portlet-body"> <div class="working-group"> <div class="working-group__header"> <p class="title-secondary">Working Groups</p> </div> <div class="working-group__wrapper"> <div class="working-group-list"> <div class="working-group-list__item"> <a href="https://www.bipm.org/web/guest/committees/cc/cctf/wg/ccl-cctf-wgfs" class="working-group-list__link"> <div> <div class="working-group-list__picto"></div> </div> <div> <p class="working-group-list__id">CCL-CCTF-WGFS</p> <p class="working-group-list__title">CCL-CCTF Working Group on Frequency Standards</p> </div> </a> </div> <div class="working-group-list__item"> <a href="https://www.bipm.org/web/guest/committees/cc/cctf/wg/cctf-wg-algo" class="working-group-list__link"> <div> <div class="working-group-list__picto"></div> </div> <div> <p class="working-group-list__id">CCTF-WG-ALGO</p> <p class="working-group-list__title">CCTF Working Group on Time Scale Algorithms</p> </div> </a> </div> <div class="working-group-list__item"> <a href="https://www.bipm.org/web/guest/committees/cc/cctf/wg/cctf-wgatft" class="working-group-list__link"> <div> <div class="working-group-list__picto"></div> </div> <div> <p class="working-group-list__id">CCTF-WGATFT</p> <p class="working-group-list__title">CCTF Working Group on Coordination of the Development of Advanced Time and Frequency Transfer Techniques</p> </div> </a> </div> <div class="working-group-list__item"> <a href="https://www.bipm.org/web/guest/committees/cc/cctf/wg/cctf-wggnss" class="working-group-list__link"> <div> <div class="working-group-list__picto"></div> </div> <div> <p class="working-group-list__id">CCTF-WGGNSS</p> <p class="working-group-list__title">CCTF Working Group on GNSS Time Transfer</p> </div> </a> </div> <div class="working-group-list__item"> <a href="https://www.bipm.org/web/guest/committees/cc/cctf/wg/cctf-wgmra" class="working-group-list__link"> <div> <div class="working-group-list__picto"></div> </div> <div> <p class="working-group-list__id">CCTF-WGMRA</p> <p class="working-group-list__title">CCTF Working Group on the CIPM MRA</p> </div> </a> </div> <div class="working-group-list__item"> <a href="https://www.bipm.org/web/guest/committees/cc/cctf/wg/cctf-wgpsfs" class="working-group-list__link"> <div> <div class="working-group-list__picto"></div> </div> <div> <p class="working-group-list__id">CCTF-WGPSFS</p> <p class="working-group-list__title">CCTF Working Group on Primary and Secondary Frequency Standards</p> </div> </a> </div> <div class="working-group-list__item"> <a href="https://www.bipm.org/web/guest/committees/cc/cctf/wg/cctf-wgsp" class="working-group-list__link"> <div> <div class="working-group-list__picto"></div> </div> <div> <p class="working-group-list__id">CCTF-WGSP</p> <p class="working-group-list__title">CCTF Working Group on Strategic Planning</p> </div> </a> </div> <div class="working-group-list__item"> <a href="https://www.bipm.org/web/guest/committees/cc/cctf/wg/cctf-wgtai" class="working-group-list__link"> <div> <div class="working-group-list__picto"></div> </div> <div> <p class="working-group-list__id">CCTF-WGTAI</p> <p class="working-group-list__title">CCTF Working Group on TAI</p> </div> </a> </div> <div class="working-group-list__item"> <a href="https://www.bipm.org/web/guest/committees/cc/cctf/wg/cctf-wgtwstft" class="working-group-list__link"> <div> <div class="working-group-list__picto"></div> </div> <div> <p class="working-group-list__id">CCTF-WGTWSTFT</p> <p class="working-group-list__title">CCTF Working Group on Two-Way Satellite Time and Frequency Transfer</p> </div> </a> </div> </div> </div> </div> </div> </div> </div> </section> </div> <div class="portlet-boundary portlet-boundary_CommitteePublications_ portlet-static portlet-static-end bipm-lame-grey " id="p_p_id_CommitteePublications_INSTANCE_qhvdVotHaOMr_"> <span id="p_CommitteePublications_INSTANCE_qhvdVotHaOMr"></span> <section class="portlet" id="portlet_CommitteePublications_INSTANCE_qhvdVotHaOMr"> <div class="portlet-content"> <div class="autofit-float autofit-row portlet-header"> <div class="autofit-col autofit-col-expand"> <h2 class="portlet-title-text">Publications</h2> </div> </div> <div class=" portlet-content-container"> <div class="portlet-body"> <p class="title-secondary publications__portlettitle"> Publications </p> <div class="publications__toolbar"> <div><div class=""><nav class="management-bar navbar navbar-expand-md management-bar-light"><div class="container-fluid container-fluid-max-xl"><ul class="navbar-nav"><li class="nav-item"><a class="link-unstyled nav-link nav-link-monospaced"><svg class="lexicon-icon lexicon-icon-order-list-up" role="presentation" viewBox="0 0 512 512" ><use xlink:href="https://www.bipm.org/o/bipm-theme/images/clay/icons.svg#order-list-up" /></svg></a></li></ul><ul class="navbar-nav"><li class="nav-item navbar-breakpoint-d-none"><button class="nav-link nav-link-monospaced btn btn-monospaced btn-unstyled" type="button"><svg class="lexicon-icon lexicon-icon-search" role="presentation" viewBox="0 0 512 512" ><use xlink:href="https://www.bipm.org/o/bipm-theme/images/clay/icons.svg#search" /></svg></button></li><li class="nav-item"><div class="dropdown"><button aria-label="Show View Options" class="dropdown-toggle nav-link nav-link-monospaced btn btn-monospaced btn btn-unstyled" type="button"><svg class="lexicon-icon lexicon-icon-cards2" role="presentation" viewBox="0 0 512 512" ><use xlink:href="https://www.bipm.org/o/bipm-theme/images/clay/icons.svg#cards2" /></svg></button></div></li></ul></div></nav></div><div id="nnxi"></div></div> </div> <p class="title-secondary title-secondary--small"> Meeting reports </p> <div class="publications"> <div class="publications__content"> <a href="https://www.bipm.org/documents/20126/30132574/CCTF21.pdf/525bb9fb-23db-377f-03d5-947b58731c2d" class="title-third"> [CCTF] 21st meeting (2017) </a> <p class="publications__body"></p> <p class="publications__body"></p> </div> </div> <p class="title-secondary title-secondary--small"> Guidance documents on the CIPM MRA </p> <div class="publications"> <div class="publications__content"> <a href="https://www.bipm.org/documents/20126/30132586/cc-publication-ID-518/9a746860-62a0-9952-1660-3c68f725b006" class="title-third"> [CCTF] CCTF Guidelines for Planning, Organizing, Conducting and Reporting Key, Supplementary and Pilot Comparisons </a> <p class="publications__body"></p> <p class="publications__body"></p> </div> <div class="publications__content"> <a href="https://www.bipm.org/documents/20126/30132541/cc-publication-ID-442/056edd0f-100d-d164-a206-e790e5852d68" class="title-third"> [CCTF] CCTF-WGMRA Guideline 6: Requirements for participation in the computation of UTC at the BIPM (2017) </a> <p class="publications__body"></p> <p class="publications__body"></p> </div> <div class="publications__content"> <a href="https://www.bipm.org/documents/20126/30132530/cc-publication-ID-441-/52f1232f-eff0-29d4-3314-29c6e669aab1" class="title-third"> [CCTF] CCTF-WGMRA Guideline 8: Technical requirements for participation in UTC (2017) </a> <p class="publications__body"></p> <p class="publications__body"></p> </div> </div> <div class="list-members__footer"> <a class="button-primary" href="/committees/cc/cctf/publications" role="button"> All publications </a> </div> </div> </div> </div> </section> </div> <div class="portlet-boundary portlet-boundary_com_liferay_journal_content_web_portlet_JournalContentPortlet_ portlet-static portlet-static-end bipm-lame-white portlet-journal-content " id="p_p_id_com_liferay_journal_content_web_portlet_JournalContentPortlet_INSTANCE_tBWyGe8g3J10_"> <span id="p_com_liferay_journal_content_web_portlet_JournalContentPortlet_INSTANCE_tBWyGe8g3J10"></span> <section class="portlet" id="portlet_com_liferay_journal_content_web_portlet_JournalContentPortlet_INSTANCE_tBWyGe8g3J10"> <div class="portlet-content"> <div class="autofit-float autofit-row portlet-header"> <div class="autofit-col autofit-col-expand"> <h2 class="portlet-title-text">CCTF-mission</h2> </div> <div class="autofit-col autofit-col-end"> <div class="autofit-section"> <div class="visible-interaction"> </div> </div> </div> </div> <div class=" portlet-content-container"> <div class="portlet-body"> <div class="" data-fragments-editor-item-id="46722-39067654" data-fragments-editor-item-type="fragments-editor-mapped-item" > <div class="journal-content-article " data-analytics-asset-id="39067652" data-analytics-asset-title="CCTF-mission" data-analytics-asset-type="web-content"> <h2>Mission</h2> <p>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.</p> <p>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.</p> </div> </div> </div> </div> </div> </section> </div> <div class="portlet-boundary portlet-boundary_com_liferay_nested_portlets_web_portlet_NestedPortletsPortlet_ portlet-static portlet-static-end bipm-lame-grey portlet-nested-portlets " id="p_p_id_com_liferay_nested_portlets_web_portlet_NestedPortletsPortlet_INSTANCE_tsm3eF4HdYDY_"> <span id="p_com_liferay_nested_portlets_web_portlet_NestedPortletsPortlet_INSTANCE_tsm3eF4HdYDY"></span> <section class="portlet" id="portlet_com_liferay_nested_portlets_web_portlet_NestedPortletsPortlet_INSTANCE_tsm3eF4HdYDY"> <div class="portlet-content"> <div class="autofit-float autofit-row 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id="p_p_id_com_liferay_asset_publisher_web_portlet_AssetPublisherPortlet_INSTANCE_Ry8Fhqt7kH56_"> <span id="p_com_liferay_asset_publisher_web_portlet_AssetPublisherPortlet_INSTANCE_Ry8Fhqt7kH56"></span> <section class="portlet" id="portlet_com_liferay_asset_publisher_web_portlet_AssetPublisherPortlet_INSTANCE_Ry8Fhqt7kH56"> <div class="portlet-content"> <div class=" portlet-content-container"> <div class="portlet-body"> <p class="asset-entries-group-label h3">News and Updates</p> <div class="bipm-list"> <div class="bipm-list__content bipm-list__content--news"> <div class="col-12 col-md-4 text-center pr-md-0"> <a href="https://www.bipm.org/en/-/2024-10-11-cctf-webpage"> <img src="/documents/20126/27073072/Logo CCTF.png/5c1131c4-175e-d020-b753-dc7749180791?imageThumbnail=1" class="news-details__img img-fluid"/> </a> </div> <div class="col-12 col-md-8"> <a href="https://www.bipm.org/en/-/2024-10-11-cctf-webpage"> <h3 class="title-third">Keep up to date with plans for the redefinition of the second</h3> <p><p>The CCTF has prepared a webpage that will be updated regularly with information on the redefinition.</p></p> </a> </div> </div> <div class="bipm-list__content bipm-list__content--news"> <div class="col-12 col-md-4 text-center pr-md-0"> <a href="https://www.bipm.org/en/-/2024-07-23-cctf-cb-project"> <img src="/documents/20126/259743915/UTC-Learning-262px/7943c202-f4eb-e286-6d6c-26b5464a5513?imageThumbnail=1" class="news-details__img img-fluid"/> </a> </div> <div class="col-12 col-md-8"> <a href="https://www.bipm.org/en/-/2024-07-23-cctf-cb-project"> <h3 class="title-third">CCTF capacity building project to improve the quality of UTC(k) and UTC time scales is taking shape</h3> <p><p>The joint project between the CCTF and the UFFC is aimed at improving the capabilities of UTC laboratories, NMIs and the broader TF community.</p></p> </a> </div> </div> <div class="bipm-list__content bipm-list__content--news"> <div class="col-12 col-md-4 text-center pr-md-0"> <a href="https://www.bipm.org/en/-/2024-06-17-circ-t-updates"> <img src="/documents/20126/258067101/UTC_LOGO_TEXT_COLOUR_262/6394b596-5db3-2968-df23-7dcf1fce34b3?imageThumbnail=1" class="news-details__img img-fluid"/> </a> </div> <div class="col-12 col-md-8"> <a href="https://www.bipm.org/en/-/2024-06-17-circ-t-updates"> <h3 class="title-third">BIPM <i>Circular T</i>: updated format and new information</h3> <p><p>The changes will be introduced from <em>Circular T</em> number 437 in June 2024.</p></p> </a> </div> </div> <div class="bipm-list__content bipm-list__content--news"> <div class="col-12 col-md-4 text-center pr-md-0"> <a href="https://www.bipm.org/en/-/unesco-wmd-2024-event"> <img src="/documents/20126/248038668/14 May event at UNESCO_speakers_croped_262 pixels/4d1b272f-3c49-997e-628c-d6638d503537?imageThumbnail=1" class="news-details__img img-fluid"/> </a> </div> <div class="col-12 col-md-8"> <a href="https://www.bipm.org/en/-/unesco-wmd-2024-event"> <h3 class="title-third">WMD 2024 Launch Event hosted at UNESCO headquarters</h3> <p><p>First celebration of World Metrology Day following the formal proclamation by UNESCO.</p></p> </a> </div> </div> <div class="bipm-list__content bipm-list__content--news"> <div class="col-12 col-md-4 text-center pr-md-0"> <a href="https://www.bipm.org/en/-/2024-04-03-quantum-technologies-ws"> <img src="/documents/20126/228106699/Quantum visual_262 pixels/5d8d8b87-939c-16b7-8b40-9e28dc882add?imageThumbnail=1" class="news-details__img img-fluid"/> </a> </div> <div class="col-12 col-md-8"> <a href="https://www.bipm.org/en/-/2024-04-03-quantum-technologies-ws"> <h3 class="title-third">BIPM workshop on Quantum Technologies</h3> <p><p>Key insights and a white paper will be published later this year.</p></p> </a> </div> </div> </div> </div> </div> </div> </section> </div> </div> </div> <div class="col-md-4 portlet-column portlet-column-last" id="_com_liferay_nested_portlets_web_portlet_NestedPortletsPortlet_INSTANCE_tsm3eF4HdYDY__column-2"> <div class="portlet-dropzone portlet-column-content portlet-column-content-last" id="layout-column__com_liferay_nested_portlets_web_portlet_NestedPortletsPortlet_INSTANCE_tsm3eF4HdYDY__column-2"> <div class="portlet-boundary portlet-boundary_com_liferay_asset_publisher_web_portlet_AssetPublisherPortlet_ portlet-static portlet-static-end decorate portlet-asset-publisher " id="p_p_id_com_liferay_asset_publisher_web_portlet_AssetPublisherPortlet_INSTANCE_vs6lud24cVvb_"> <span id="p_com_liferay_asset_publisher_web_portlet_AssetPublisherPortlet_INSTANCE_vs6lud24cVvb"></span> <section class="portlet" id="portlet_com_liferay_asset_publisher_web_portlet_AssetPublisherPortlet_INSTANCE_vs6lud24cVvb"> <div class="portlet-content"> <div class="autofit-float autofit-row portlet-header"> <div class="autofit-col autofit-col-expand"> <h2 class="portlet-title-text">Asset Publisher</h2> </div> </div> <div class=" portlet-content-container"> <div class="portlet-body"> <p class="asset-entries-group-label h3">Reports and announcements</p> <div class="bipm-list announcements"> <div class="bipm-list__content bipm-list__content--announcements"> <div class="row align-items-center"> <div class="col-auto pr-0"> <a href="/committees/cb/cbkt/ym-2050"> <img class="announcements-icon" src="https://www.bipm.org/documents/20126/62691511/bipm-link.png/a6bb2dd2-78be-8c09-66cf-ab55cf481475?version=1.1&t=1635239552709&download=true"/> </a> </div> <div class="col"> <a href="/committees/cb/cbkt/ym-2050"> <h3 class="title-third">Young Metrologists' 2050+ Vision</h3> </a> </div> </div> </div> <div class="bipm-list__content bipm-list__content--announcements"> <div class="row align-items-center"> <div class="col-auto pr-0"> <a href="/documents/20126/262478877/CIPM2024-Session-II-EN/1dbe278e-5fd0-3504-1b08-533f90b68f36"> <img class="announcements-icon" src="https://www.bipm.org/documents/20126/62691511/download.png/7a8551fa-053a-3018-8617-edd277605a05?version=1.1&t=1635239522317&download=true"/> </a> </div> <div class="col"> <a href="/documents/20126/262478877/CIPM2024-Session-II-EN/1dbe278e-5fd0-3504-1b08-533f90b68f36"> <h3 class="title-third">Report of Session II of the 113th meeting of the CIPM (2024)</h3> </a> </div> </div> </div> <div class="bipm-list__content bipm-list__content--announcements"> <div class="row align-items-center"> <div class="col-auto pr-0"> <a href="/documents/20126/259201574/WP-report-Jan-Dec2023 - Annual review/7ca07940-381e-c649-c727-a0a5223f6f41"> <img class="announcements-icon" src="https://www.bipm.org/documents/20126/62691511/news-bipm.png/7d6ee8d1-7f9b-5eab-539c-e616a6e95169?version=1.2&t=1635348967097&download=true"/> </a> </div> <div class="col"> <a href="/documents/20126/259201574/WP-report-Jan-Dec2023 - Annual review/7ca07940-381e-c649-c727-a0a5223f6f41"> <h3 class="title-third">Annual Review 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src="https://www.bipm.org/documents/20126/62691511/download.png/7a8551fa-053a-3018-8617-edd277605a05?version=1.1&t=1635239522317&download=true"/> </a> </div> <div class="col"> <a href="/documents/20126/248048736/CIPM2024-Session-I-EN/9dd8f19c-93a8-8230-fa61-0ab97036bfd1"> <h3 class="title-third">Report of Session I of the 113th meeting of the CIPM (2024)</h3> </a> </div> </div> </div> <div class="bipm-list__content bipm-list__content--announcements"> <div class="row align-items-center"> <div class="col-auto pr-0"> <a href="/documents/20126/234853367/CGPM2022/db61a371-f046-c7b4-a860-80bb798096b6"> <img class="announcements-icon" src="https://www.bipm.org/documents/20126/62691511/download.png/7a8551fa-053a-3018-8617-edd277605a05?version=1.1&t=1635239522317&download=true"/> </a> </div> <div class="col"> <a href="/documents/20126/234853367/CGPM2022/db61a371-f046-c7b4-a860-80bb798096b6"> <h3 class="title-third">Proceedings of the <nobr>27th meeting</nobr> of the CGPM (2022)</h3> </a> </div> </div> </div> <div class="bipm-list__content bipm-list__content--announcements"> <div class="row align-items-center"> <div class="col-auto pr-0"> <a href="/documents/20126/220989730/CIPM112/205c84da-6d72-8253-71c8-cf91f585c601"> <img class="announcements-icon" src="https://www.bipm.org/o/bipm-theme/images/download.svg"/> </a> </div> <div class="col"> <a href="/documents/20126/220989730/CIPM112/205c84da-6d72-8253-71c8-cf91f585c601"> <h3 class="title-third">Report of the 112th meeting of the CIPM (2023)</h3> </a> </div> </div> </div> </div> </div> </div> </div> </section> </div> </div> </div> </div> </div> </div> </div> </div> </section> </div> </div> </div> </div> </div> <form action="#" aria-hidden="true" class="hide" id="hrefFm" method="post" name="hrefFm"><span></span><button hidden type="submit">Hidden</button></form> </div> </main> <footer id="footer" class="footer" role="contentinfo"> <div class="container"> <div class="row flex-lg-row-reverse"> <div class="col-12 col-lg-9 pt-2"> 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