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parts per million (ppm)

Parts per million (ppm) means "parts per million", i.e. 10exp-6 or 0.000 001. It is a quantity used to indicate changes in electronic parameters, accuracies

, stabilities, concentrations and mixing ratios. A quartz oscillator with a frequency stability of 5 ppm has a maximum frequency deviation of 0.000 005 ppm, i.e. only 5 Hz in relation to an oscillator frequency of 1 MHz, for example.

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Englisch: parts per million - ppm
Updated at: 08.09.2010
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