Jackson Labs PHASE STATION 53100A, User Manual

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PhaseStation 53100A User’s Manual V1.04 25-Apr-2022 138
bin locations is unaffected by spline interpolation, keep in mind that it may exaggerate the apparent
trace amplitude elsewhere, especially near high-variance degenerate bins. Once again, longer
measurements yield smoother traces.
In all other respects, cross ADEV measurements are similar to those obtained in the other measurement
roles. When a single reference source is used, the phase- and frequency-difference traces for the
primary and secondary phase records will be virtually identical to each other except for differences in
instrument noise (although the secondary phase record is accessible only when the
Additional options ->
Enable secondary plots
box is checked in the 53100A acquisition dialog.) Phase noise and AM noise
measurements, if enabled, will be performed using the same 3-1 and 4-2 channels used in other single-
DUT ADEV measurement roles.
TimeLab’s cross ADEV implementation can be thought of as a four-channel application of the
Groslambert Covariance (GCov) methodology.
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As a general guideline, traditional three-cornered hat
tests should be performed only when three concurrent measurements of independent sources are
actually needed. When only one source needs to be measured against either one or two references, the
cross ADEV role will almost always return superior results in less measurement time.
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Vernotte and Lantz, Three-Cornered Hat and Groslambert Covariance: A first attempt to assess the uncertainty domains