Discussion
Why does an oscillator's frequency drift during the first minutes after switch-on?
Answer: D
Self-heating and the enclosure's warming change the reactive components' values until temperatures stabilise, which for a crystal source can take several minutes. The supply settles in milliseconds, the amplitude loop in a fraction of a second, and the feedback fraction is set by components whose values barely matter to frequency. Specifying a warm-up time alongside a stability figure is standard practice for exactly this reason, and quoting the figure without it would be misleading.
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