Encyclopedia > Cesium standard

Article Content

Cesium standard

In telecommunication, a cesium standard is a primary frequency standard in which electronic transitions[?] between the two hyperfine[?] ground states of cesium-133 atoms is used to control the output frequency.

Note : The energy level between the two hyperfine ground states corresponds, in the absence of external influences (e.g. , the Earth's magnetic field), to a frequency of 9,192,631,770 Hz.

Source: from Federal Standard 1037C and from MIL-STD-188

All Wikipedia text is available under the terms of the GNU Free Documentation License

Search Encyclopedia

Search over one million articles, find something about almost anything!

Featured Article

North Haven, New York

... age or older. The average household size is 2.20 and the average family size is 2.77. In the village the population is spread out with 17.4% under the age of 18, 3.5% ...