Jackson Labs PHASE STATION 53100A, Руководство пользователя

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PhaseStation 53100A User’s Manual V1.04 25-Apr-2022 46
inconsistent drift characteristics, its short-term ADEV will eventually resemble the HDEV
performance that was observed only a few minutes after power-up.
Time Deviation ( t )
TDEV, or σ
x
(τ ), expresses the time stability of phase at the specified tau, in units of
seconds. Numerically, TDEV is equal to (MDEV * τ ) / sqrt(3). It’s similar to the TIE (Time
Interval Error) statistic used by the telecommunications sector.
Maximum Time Interval Error ( M )
Simply put, MTIE represents the worst-case timing performance of the clock under test over the
tau intervals covered by the measurement, as observed by sliding windows of the corresponding
tau durations through the phase record. Like TDEV, MTIE is frequently encountered in
telecommunications standards specifications.
Along with the other stability metrics supported by TimeLab, the MTIE plot is computed on an
incremental basis as successive data points arrive from the counter or phase-difference analyzer
and updated in real time. Because MTIE calculations are more time-consuming than the other
stability metrics supported by TimeLab, they are performed on only the first 10,000 points of the
phase record by default. This limitation can be removed by deselecting the
File→Limit MTIE
processing to 10K points option.