Reply to the Comment on 'evaluation of the Primary Frequency Standard Npl-Csf1'
European Frequency and Time Forum(2004)
Natl Phys Lab
Abstract
A full performance evaluation of the caesium fountain primary frequency standard at the NPL is reported. Improved magnetic shielding has resulted in the inhomogeneity of the C-field being below 1 nT. The measurement of the frequency bias due to cold collisions is described. A direct evaluation of the fountain's frequency stability, in comparison to that of a hydrogen maser, is reported
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Key words
Frequency Comparison,Frequency Metrology
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