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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 Fork s 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 Clock s ( Caesium Standard s) and hydrogen Maser s. REFERENCES Federal Standard 1037C and MIL-STD-188 SEE ALSO |
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