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IEVref:561-03-10ID:
Language:enStatus: Standard
Term: frequency tolerance, <of an oscillator>
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Definition: maximum permissible deviation of the oscillator frequency from a specified nominal value when operating under specified conditions

Note 1 to entry: Frequency tolerances are often assigned separately to specified ambient effects, namely electrical, mechanical and environmental. When this approach is used, it is necessary to define the values of other operating parameters as well as the range of the specified variable, that is to say:

  • deviation from the frequency at the specified reference temperature due to operation over the specified temperature range, other conditions remaining constant;
  • deviation from the frequency at the specified supply voltage due to supply voltage changes over the specified range, other conditions remaining constant;
  • deviation from the initial frequency due to ageing, other conditions remaining constant;
  • deviation from the frequency with specified load conditions due to changes in load impedance over the specified range, other conditions remaining constant.

In some cases, an overall frequency tolerance may be specified, due to any or all combinations of operating parameters, during a specified lifetime.

Note 2 to entry: This entry was numbered 561-02-17, 561-02-18 and 561-02-19 in IEC 60050-561:1991.


Publication date:2014-11
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