1 Sigfrido Leschiutta CCTF Chairman CCTF CONSULTATIVE COMMITTEE FOR TIME AND FREQUENCY REPORT FOR THE XXII CONFÉRENCE GÉNÉRALE DES POIDS ET MESURES Paris, 8-13 October 2003

2 XXII CGPM CCTF REPORT the second frequency standards the hour time scales global clock comparisons how compare the clocks of the NMI’s clocks and frequency standards uses in Science and Technology joint activity CCL-CCTF toward future secondary optical definition of the second

3 the best atomic clocks caesium fountains

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6 SYRTE-FO2 FRANCE

7 NIST-F1 USA

8 PTB-CSF1 GERMANY

9 IEN-CSF1 ITALY

10 38 countries participating into TAI: PolandIsraelThailand AustraliaPortugalSpain AustriaNorwayHong-Kong ChinaLithuaniaU.K. SwitzerlandJapanSweden MexicoRomaniaSlovakia GermanyUSAIndia ItalyBulgariaCanada ArgentinaSingaporeRussian Federation Czeck RepublicKorea, Rep. ofChinese Taipei TurkeySouth AfricaNew Zealand FranceThe NetherlandsBelgium BrazilChile 53 laboratories participating into TAI

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12 XXII CGPM CCTF REPORT clocks and frequency standards uses in Science and Technology fundamental research and fundamental constants metrological applications, outside time telecommunications satellite navigation systems

13 XXII CGPM CCTF REPORT