unbiased estimate of the preferred definition in the time domain of the short-term stability characteristic of the oscillator output frequency given by
where Yk are the average fractional frequency fluctuations obtained sequentially, with no systematic dead time between measurements; τ is the sample time over which the measurements are averaged; M is the number of measurements Note 1 to entry: The confidence of the estimate improves as M increases. Note 2 to entry: This entry was numbered 561-04-18 in IEC 60050-561:1991.
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