Frequency standard

Frequency standard

A frequency standard is a stable oscillator used for frequency calibration or reference. A frequency standard generates a fundamental frequency with a high degree of accuracy and precision. Harmonics of this fundamental frequency are used to provide reference points.

Frequency standards in a network or facility are sometimes administratively designated as "primary" or "secondary". The terms "primary" and "secondary", as used in this context, should not be confused with the respective technical meanings of these words in the discipline of precise time and frequency.

Frequency reference

A frequency reference is an instrument used for providing a stable frequency of some kind. There are different sorts of frequency references, acoustic ones such as tuning forks but also electrical ones that emit a signal of a certain frequency (a frequency standard).

Among the most stable frequency references in the world are caesium-based atomic clocks (caesium standards) and hydrogen masers.

The carrier of time signal transmitters, LORAN-C transmitters and of several longwave and mediumwave broadcasting stations is derived from an atomic clock and can be therefore used as frequency standard.

References

Federal Standard 1037C and MIL-STD-188

ee also

* Caesium standard
* Rubidium standard
* Atomic clock


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  • frequency standard — dažnio etalonas statusas T sritis Standartizacija ir metrologija apibrėžtis Etalonas, atkuriantis ir išlaikantis dažnio matavimo vienetą hercą. atitikmenys: angl. frequency standard vok. Frequenznormal, n rus. эталон частоты, m pranc. étalon de… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • frequency standard — dažnio etalonas statusas T sritis fizika atitikmenys: angl. frequency standard vok. Frequenznormal, n rus. эталон частоты, m pranc. étalon fréquence, m …   Fizikos terminų žodynas

  • Secondary frequency standard — In telecommunications, a secondary frequency standard is a frequency standard that does not have inherent accuracy, and therefore must be calibrated against a primary frequency standard. Secondary standards include crystal oscillators and… …   Wikipedia

  • primary frequency standard — pirminis dažnio standartas statusas T sritis automatika atitikmenys: angl. primary frequency standard vok. Primärfrequenzstandard, m rus. первичный стандарт частоты, m pranc. étalon primaire de fréquence, m …   Automatikos terminų žodynas

  • secondary frequency standard — antrinis dažnio standartas statusas T sritis automatika atitikmenys: angl. secondary frequency standard vok. Sekundärfrequenzstandard, m rus. вторичный стандарт частоты, m pranc. étalon secondaire de fréquence, m …   Automatikos terminų žodynas

  • ammonium molecular beam frequency standard — amoniako dažnio etalonas statusas T sritis radioelektronika atitikmenys: angl. ammonium molecular beam frequency standard vok. Ammoniakstrahlfrequenznormal, n rus. эталон частоты на пучке молекул аммиака, m pranc. étalon de fréquence à ammoniac,… …   Radioelektronikos terminų žodynas

  • molecular frequency standard — molekulinis dažnio etalonas statusas T sritis radioelektronika atitikmenys: angl. molecular frequency standard vok. Molekularfrequenznormal, n rus. молекулярный эталон частоты, m pranc. étalon moléculaire de fréquence, m …   Radioelektronikos terminų žodynas

  • rubidium frequency standard — rubidžio dažnio etalonas statusas T sritis radioelektronika atitikmenys: angl. rubidium frequency standard vok. Rubidiumfrequenznormal, n rus. рубидиевый эталон частоты, m pranc. étalon de fréquence à rubidium, m …   Radioelektronikos terminų žodynas

  • secondary frequency standard — antrinis dažnio etalonas statusas T sritis radioelektronika atitikmenys: angl. secondary frequency standard vok. Sekundärfrequenznormal, n rus. вторичный эталон частоты, m pranc. étalon secondaire de fréquence, m …   Radioelektronikos terminų žodynas

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