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
Kuru Kuru Kururin

... was released in Japan and Europe but not in the United States. However, because the GBA has no region lockout, European games will work fine on a U.S. GBA unit, and ...

This page was created in 25 ms