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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク NIST-F2 ： ウィキペディア英語版 NIST-F2 NIST-F2 is a caesium fountain atomic clock that, along with NIST-F1, serves as the United States' primary time and frequency standard.〔(NIST Launches a New U.S. Time Standard: NIST-F2 Atomic Clock )〕 NIST-F2 was brought online on 3 April 2014.〔 ==Accuracy== NIST-F1, a caesium fountain atomic clock used since 1999, has a fractional inaccuracy of less than δ''f''/''f'' < 5  × 10−16. The planned performance of NIST-F2 is δ''f''/''f'' < 1 × 10−16.〔(NIST Cesium Fountains — Current Status and Future Prospects ) (PDF)〕 At this planned performance level the NIST-F2 clock will not lose a second in at least 300 million years. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「NIST-F2」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.