These precision 100 kHz oven controlled crystal oscillators at the US Bureau of Standards (now NIST) served as the frequency standard for the United States in 1929.
Since time is the reciprocal of frequency, it is relatively easy to derive a time standard from a frequency standard. A standard clock comprises a frequency standard, a device to count off the cycles of the oscillation emitted by the frequency standard, and a means of displaying or outputting the result.
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 referenceedit
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 standards (including caesium fountains) and hydrogen masers. Caesium standards are widely recognized as having better long-term stability, whereas hydrogen masers can attain superior short-term performance; therefore, several national standards laboratories use ensembles of caesium standards and hydrogen masers in order to combine the best attributes of both.
The carrier of time signal transmitters, Loran-C transmitters and of several long wave and medium wave broadcasting stations is derived from an atomic clock and can be therefore used as frequency standard.
frequency, standard, this, article, multiple, issues, please, help, improve, discuss, these, issues, talk, page, learn, when, remove, these, template, messages, this, article, needs, updated, please, help, update, this, article, reflect, recent, events, newly,. This article has multiple issues Please help improve it or discuss these issues on the talk page Learn how and when to remove these template messages This article needs to be updated Please help update this article to reflect recent events or newly available information December 2015 This article includes a list of general references but it lacks sufficient corresponding inline citations Please help to improve this article by introducing more precise citations December 2022 Learn how and when to remove this message Learn how and when to remove this message 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 These precision 100 kHz oven controlled crystal oscillators at the US Bureau of Standards now NIST served as the frequency standard for the United States in 1929 Since time is the reciprocal of frequency it is relatively easy to derive a time standard from a frequency standard A standard clock comprises a frequency standard a device to count off the cycles of the oscillation emitted by the frequency standard and a means of displaying or outputting the result 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 editA 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 standards including caesium fountains and hydrogen masers Caesium standards are widely recognized as having better long term stability whereas hydrogen masers can attain superior short term performance therefore several national standards laboratories use ensembles of caesium standards and hydrogen masers in order to combine the best attributes of both The carrier of time signal transmitters Loran C transmitters and of several long wave and medium wave broadcasting stations is derived from an atomic clock and can be therefore used as frequency standard See also editRubidium standard Standard frequency and time signal serviceReferences edit Retrieved from https en wikipedia org w index php title Frequency standard amp oldid 1164547806, wikipedia, wiki, book, books, library,
