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Fractional frequency offset

A measure of the deviation of the frequency of a signal from a reference, expressed as a ratio. The ratio is dimensionless but typically expressed as parts per million, ppm. For example, 4. 6 ppm = 4. 6/106. Fractional frequency offset = where: f = the actual frequency output of the signal in question, and fr = the reference frequency. Synonym fractional frequency deviation.

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