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primary frequency standard

См. также в других словарях:

  • 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

  • Primary time standard — In telecommunications, a primary time standard is a time standard that does not require calibration against another time standard. Note 1: Examples of primary time, ( i.e. , frequency standards) are caesium standards and hydrogen masers. Note 2:… …   Wikipedia

  • 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

  • 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… …   Wikipedia

  • Frequency assignment authority — In telecommunication, frequency assignment authority is the power granted an administration, or its designated or delegated leader or agency via treaty or law, to specify frequencies, or frequency bands, in the electromagnetic spectrum for use in …   Wikipedia

  • Caesium standard — A caesium standard or caesium atomic clock is a primary frequency standard in which electronic transitions between the two hyperfine ground states of caesium 133 atoms are used to control the output frequency. They are one of the most accurate… …   Wikipedia

  • Standard Mandarin — Standard Mandarin, also known as Standard Spoken Chinese, is the official modern Chinese spoken language used in mainland China and Taiwan, and is one of the four official languages of Singapore.The phonology of Standard Mandarin is based on the… …   Wikipedia

  • Standard Chinese — For other uses, see Standard Chinese (disambiguation). Standard Chinese 普通話 / 普通话 Pǔtōnghuà 國語 / 国语 Guóyǔ 標準華語 / 标准华语 Biāozhǔn Huáyǔ 現代標準漢語 / 现代标准汉语 Xiàndài Biāozhǔn Hànyǔ Spoken in People s Republic of China, Republic of China (Taiwan),… …   Wikipedia

  • Primary Atomic Reference Clock in Space — The Primary Atomic Reference Clock in Space or PARCS is an atomic clock mission once scheduled to fly on the International Space Station (ISS) in 2008, but cancelled to make way for the Vision for Space Exploration.[1] The mission, to have been… …   Wikipedia

  • Radio-frequency identification — (RFID) is a technology that uses radio waves to transfer data from an electronic tag, called RFID tag or label, attached to an object, through a reader for the purpose of identifying and tracking the object. Some RFID tags can be read from… …   Wikipedia

  • Orthogonal frequency-division multiplexing — Passband modulation v · d · e Analog modulation AM · …   Wikipedia

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