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  2. Clock drift - Wikipedia

    en.wikipedia.org/wiki/Clock_drift

    More advanced clocks and old mechanical clocks often have some kind of speed trimmer where one can adjust the speed of the clock and thus correct for clock drift. For instance, in pendulum clocks the clock drift can be manipulated by slightly changing the length of the pendulum. A quartz oscillator is less subject to drift due to manufacturing ...

  3. Allan variance - Wikipedia

    en.wikipedia.org/wiki/Allan_variance

    During an interval of time τ, as measured by the reference clock, the clock under test advances by τy, where y is the average (relative) clock frequency over that interval. If we measure two consecutive intervals as shown, we can get a value of ( y − y ′ ) 2 —a smaller value indicates a more stable and precise clock.

  4. Frequency drift - Wikipedia

    en.wikipedia.org/wiki/Frequency_drift

    In electrical engineering, and particularly in telecommunications, frequency drift is an unintended and generally arbitrary offset of an oscillator from its nominal frequency. Causes may include component aging, [ 1 ] changes in temperature that alter the piezoelectric effect in a crystal oscillator , or problems with a voltage regulator which ...

  5. Error analysis for the Global Positioning System - Wikipedia

    en.wikipedia.org/wiki/Error_analysis_for_the...

    The satellites' atomic clocks experience noise and clock drift errors. The navigation message contains corrections for these errors and estimates of the accuracy of the atomic clock. However, they are based on observations and may not indicate the clock's current state.

  6. Chronometry - Wikipedia

    en.wikipedia.org/wiki/Chronometry

    Horology is commonly used specifically with reference to the mechanical instruments created to keep time: clocks, watches, clockwork, sundials, hourglasses, clepsydras, timers, time recorders, marine chronometers, and atomic clocks are all examples of instruments used to measure time.

  7. Clock skew - Wikipedia

    en.wikipedia.org/wiki/Clock_skew

    There are two types of violation that can be caused by clock skew. One problem is caused when the clock reaches the first register and the clock signal towards the second register travels slower than output of the first register into the second register - the output of the first register reaches the second register input faster and therefore is clocked replacing the initial data on the second ...

  8. Atomic clock - Wikipedia

    en.wikipedia.org/wiki/Atomic_clock

    Toggle Measuring time with atomic clocks subsection. 2.1 ... The detector's signal can then be demodulated to apply feedback to control long-term drift in the radio ...

  9. Clock synchronization - Wikipedia

    en.wikipedia.org/wiki/Clock_synchronization

    Clock synchronization is a topic in computer science and engineering that aims to coordinate otherwise independent clocks. Even when initially set accurately, real clocks will differ after some amount of time due to clock drift, caused by clocks counting time at slightly different rates. There are several problems that occur as a result of ...