Caesium atomic clock

GPTKB entity

Statements (23)
Predicate Object
gptkbp:instanceOf atomic clock
gptkbp:accuracy extremely high
gptkbp:accuracyPerDay less than 1 nanosecond error
gptkbp:builtBy gptkb:Louis_Essen
gptkbp:category primary standard
frequency standard
gptkbp:establishedIn 1955
https://www.w3.org/2000/01/rdf-schema#label Caesium atomic clock
gptkbp:locationOfFirst gptkb:National_Physical_Laboratory,_UK
gptkbp:measures gptkb:time_zone
gptkbp:notableModel gptkb:NIST-F1
NPL-CsF2
gptkbp:operatingSystem room temperature
gptkbp:principle hyperfine transition of caesium-133 atom
gptkbp:replacedBy quartz clock
gptkbp:SISecondDefinition 9,192,631,770 cycles of caesium-133 transition
gptkbp:symbol Cs clock
gptkbp:usedElement gptkb:caesium
gptkbp:usedFor defining the second
gptkbp:usedIn gptkb:GPS
international time standards
gptkbp:bfsParent gptkb:Atomic_Clocks
gptkbp:bfsLayer 8