![]() ![]() LNTFS links several timescales generated from the atomic clocks operated in the partner laboratories in the Czech Republic. 6∙10 −14 for the averaging interval of 1 day. The uncertainty of the national approximation of the SI second is given namely by the frequency stability of the cesium clock, i.e. Its natural (not steered) frequency is guaranteed by the manufacturer to be offset by less than 5♱0 − 13 with respect to the ideal realization according to the definition of the SI second. The 5071A/001 clock is currently the most accurate industrial atomic clock with the best long-term frequency stability. The UTC(TP) second and its coherent frequencies are realized in the industrial high-performance cesium-beam atomic clocks 5071A/001. LNTFS generates the time scale denoted as UTC(TP) as the national approximation (prediction) of the universal coordinated time UTC. The National Time and Frequency Standard (NTFS) in the Czech Republic is maintained by the Laboratory of the National Time and Frequency Standard (NTFS) within the Institute of Photonics and Electronics AS CR. It is defined by taking the fixed numerical value of the caesium frequency, ∆ ν Cs, the unperturbed ground-state hyperfine transition frequency of the caesium 133 atom, to be 9 192 631 770 when expressed in the unit Hz, which is equal to s −1. The second, symbol s, is the SI unit of time. Name of Standard: National Time and Frequency Standardĭepartmnet: Institute of Photonics and Electronics AS CR, v. ![]()
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