What does the ppm unit mean?
时间：04-10
整理：3721RD
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can anyone explain this 'ppm' for me please,,,if possible with an example !
ppm = parts per million = 1E-6
An example: A 50 MHz crystal oscillator with +/- 25 ppm stability is equivalent to +/- 1250 Hz.
More info and examples:
http://en.wikipedia.org/wiki/Parts_per_million