Rubidium Standard
In
telecommunication
, a
rubidium standard
is a
frequency standard
in which a specified
hyperfine
transition
of
electrons
in
rubidium
-87 atoms is used to control the
output
frequency.
Note:
A rubidium standard consists of a gas cell, which has an inherent long-term instability. This instability relegates the rubidium standard to its status as a
secondary standard
. See also:
cesium standard
Source: from
Federal Standard 1037C
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