Clocks and oscillators

Caesium clock

Name: Daylight bv
Address: Brusselsesteenweg 715, Gentbrugge, 9050, BE
Telephone: +32 9 230 54 00
Price range: $$$

Also: cesiumklok

A caesium clock uses the hyperfine transition of caesium-133 (9,192,631,770 Hz) as its time base, thereby realising the definition of the second. It is the primary frequency standard: its accuracy rests on natural constants, not on calibration.

The caesium clocks in national laboratories together form the basis of TAI and UTC.

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