Transcription of Timer Calibrations Stopwatch and - NIST
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Timer Calibrations Stopwatch and - NIST
Stopwatch andTimer CalibrationsJeff C. GustRobert M. GrahamMichael A. LombardiMay 2004960-12 SpecialPublication960-12iDEPARTMENTOFCOM MERCEUNITEDSTATESOFAMERICANIST Recommended Practice GuideSpecial Publication 960-12 Stopwatch andTimer CalibrationsJeff C. GustQuametec CorporationRobert M. GrahamSandia National LaboratoriesMichael A. LombardiNational Institute of Standards and TechnologyPhysics LaboratoryMay Department of CommerceDonald L. Evans, SecretaryTechnology AdministrationPhillip J. Bond, Under Secretary for TechnologyNational Institute of Standards and TechnologyArden L. Bement, Jr., Directorii Stopwatch and Timer CalibrationsCertain commercial entities, equipment, or materials may be identified inthis document in order to describe an experimental procedure or conceptadequately.
The SI defines the second based on a property of the cesium atom, and for this reason, cesium oscillators are regarded as primary standards for both time interval and frequency. A second is defined as the time interval required for 9 192 631 770 transitions between two energy states of the cesium atom to take place.
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