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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. 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.

References

1. "A Brief History of Atomic Clocks at NIST". tf.nist.gov. Retrieved 2016-01-25.
2. "How Does the NIST-7 Atomic Clock Work? | Time and Navigation". timeandnavigation.si.edu. Retrieved 2016-01-25.

External links

• National Institute of Standards and Technology

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