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NIST-7 was the atomic clock used by the United States from 1993 to 1999. It was one of a series of Atomic Clocks at the National Institute of Standards and Technology. Eventually, it achieved an uncertainty of 5 × 10−15. The caesium beam clock served as the nation's primary time and frequency standard during that time period, but it has since been replaced with the more accurate NIST-F1, a caesium fountain atomic clock that neither gains nor loses one second in 100 million years.

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  • NIST-7 (it)
  • NIST-7 (en)
  • NIST-7 (pt)
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  • NIST-7 was the atomic clock used by the United States from 1993 to 1999. It was one of a series of Atomic Clocks at the National Institute of Standards and Technology. Eventually, it achieved an uncertainty of 5 × 10−15. The caesium beam clock served as the nation's primary time and frequency standard during that time period, but it has since been replaced with the more accurate NIST-F1, a caesium fountain atomic clock that neither gains nor loses one second in 100 million years. (en)
  • Il NIST-7 era un orologio atomico che ha scandito il tempo ufficiale degli Stati Uniti d'America dal 1993 al 1999.È stato sostituito nel 1999 dal modello NIST-F1 dotato di una maggiore accuratezza; quest'ultimo non guadagna né perde infatti nessun secondo in un periodo di 100 milioni di anni. (it)
  • Mais um relógio atômico da classe NIST (Instituto Nacional de Padrões e Tecnologia), com uma precisão incrível atrasando ou adiantando apenas 1 segundo a cada 3 milhões de anos. Pesa 1 tonelada e mede 3 metros de comprimento.O NIST localiza-se nos Estados Unidos precisamente no Colorado, e já tem projetos de incríveis máquinas capazes de atrasar ou adiantar um segundo a cada 300 milhões de anos. (pt)
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  • NIST-7 was the atomic clock used by the United States from 1993 to 1999. It was one of a series of Atomic Clocks at the National Institute of Standards and Technology. Eventually, it achieved an uncertainty of 5 × 10−15. The caesium beam clock served as the nation's primary time and frequency standard during that time period, but it has since been replaced with the more accurate NIST-F1, a caesium fountain atomic clock that neither gains nor loses one second in 100 million years. (en)
  • Il NIST-7 era un orologio atomico che ha scandito il tempo ufficiale degli Stati Uniti d'America dal 1993 al 1999.È stato sostituito nel 1999 dal modello NIST-F1 dotato di una maggiore accuratezza; quest'ultimo non guadagna né perde infatti nessun secondo in un periodo di 100 milioni di anni. (it)
  • Mais um relógio atômico da classe NIST (Instituto Nacional de Padrões e Tecnologia), com uma precisão incrível atrasando ou adiantando apenas 1 segundo a cada 3 milhões de anos. Pesa 1 tonelada e mede 3 metros de comprimento.O NIST localiza-se nos Estados Unidos precisamente no Colorado, e já tem projetos de incríveis máquinas capazes de atrasar ou adiantar um segundo a cada 300 milhões de anos. (pt)
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