The essence of time-nuttery is measuring the stability of clocks and oscillators. Allan Deviation (“ADEV”) is the statistic most commonly used to talk about frequency stability. There’s a very good article about it on Wikipedia, but it’s a bit deep for many. This post is a TL;DR description. To
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ADEV
It’s well known that just about all oscillators drift, or “age”, in frequency with time. In crystal oscillators, the most drift occurs when the oscillator is young, and over time the aging rate decreases. Power-cycling the oscillator results in a new stabilization period before the aging rate stabilizes. The best
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