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MAKE A MEME View Large Image AllanDeviation.svg en A clock is most easily tested by comparing it with a far more accurate reference clock During an interval of time τ as measured by the reference clock the clock under test advances by τy where y is the relative clock ...

AllanDeviation.svg en A clock is most easily tested by comparing it with a far more accurate reference clock During an interval of time τ as measured by the reference clock the clock under test advances by τy where y is the relative clock ...

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Keywords: AllanDeviation.svg en A clock is most easily tested by comparing it with a far more accurate reference clock During an interval of time τ as measured by the reference clock the clock under test advances by τy where y is the relative clock frequency over that interval If we take three consecutive clock measurements as shown we can get a value of y-y' 2--a smaller value indicates a more stable and precise clock If we repeat this procedure many times the average value of y-y' 2 is equal to the Allan variance or Allan deviation squared for observation time τ 2016-03-10 own Sbyrnes321 other versions cc-zero Metrology Clocks