1,721,040 research outputs found
Systematic shift uncertainty evaluation of IEN CSF1 primary frequency standard
No full textWe report a preliminary systematic shift uncertainty evaluation of our cesium fountain and of the first comparison with the NIST-F1 clock of the National Institute of Standard and Technology (NIST) with a two way satellite comparison system. The stability of the time scale UTC (IEN), (generated with a commercial Cs beam) is insufficient to allow evaluation of systematic shifts by conventional techniques; therefore, the accuracy evaluation of the fountain was accomplished using mainly fast differential techniques, resulting in an overall uncertainty of 3/spl times/10/sup -15/
IEN-CsF1 primary frequency standard at INRIM accuracy evaluation and TAI calibrations
No full textAbstract. In this paper we present an accuracy evaluation of the primary frequency standard IEN-CsF1 of the Italian 'Istituto Nazionale di Ricerca Metrologica'. In particular, we discuss the major improvements applied to the frequency standard that have allowed us to reach a total uncertainty of 8 × 10-16 in a measurement period of 20 days to 25 days. The full metrological chain that links the IEN-CsF1 fountain to the International Atomic Time scale is described and characterized, with respect to its noise and performances
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