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出典:『Wikipedia』 (2011/04/13 20:08 UTC 版)

英語による解説

引用

NIST-F2 is a caesium fountain atomic clock under construction that will serve as the United States' primary time and frequency standard. The clock will replace NIST-F1, a caesium fountain atomic clock used since 1999. NIST-F1 has a fractional inaccuracy of less than δf/f < 5 × 10⁻¹⁶, the planned performance of NIST-F2 is δf/f < 1 × 10⁻¹⁶.