
Sigma vs. Tau
1 Access Groph
flccpptable Values: 2 TO W)
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Introduction
The Sigma vs. Tau function calculates fractional frequency deviation
(a) as a function of averaging time or measurement time (r) over
the range of r permitted by the available phase noise data. This
calculation requires that parameters N, T, and f
h
(cutoff frequency)
be specified.
• N is the number of frequency averages used to compute the mean
frequency for the calculation of a.
• T is the total time period (dwell plus samples).
• r (tau) is the averaging time selected (sample time, measurement
time).
• Cutoff Fr. (f
h
) is the measurement system bandwidth.
rev.05SEP89
Sigma vs. Tau 4-9
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