time standard


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time standard

[′tīm ‚stan·dərd]
(horology)
A recurring phenomenon, used as a reference for establishing a unit of time; the presently accepted standard is the second, defined to be 9,192,631,770 transitions between two specified hyperfine levels of the atom of cesium-133.
(industrial engineering)
References in periodicals archive ?
The committee also proposes new subdivision (e)(1)(G), a time standard for permanency proceedings.
switched to a new type of timekeeping technology--the atomic fountain clock--as the nation's primary time standard (SN: 8/7/99, p.
That group will evaluate the mission of the 1200 Committee and determine if and how the process for developing a national response time standard will proceed, a review process that could take up to two years to complete.
Ramsey's approach of imposing two separate, oscillating electromagnetic fields on an atomic beam to induce energy-level transitions formed the basis for the cesium atomic clock, which sets the present time standard.
Such a scheme may form the basis of an atomic clock for establishing a time standard.