optional measure of the frequency stability in the frequency domain Note 1 to entry: Incidental frequency modulation is best described in terms of the spectrum of the resultant base-band signal obtained by applying the oscillator signal to an ideal discriminator circuit of specified characteristics. Note 2 to entry: If the detection bandwidth is adequately specified, the incidental frequency modulation may be expressed as a fractional proportion of the output frequency (for example 2 x 10–8 rms in a 10 kHz band).
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