Jackson Labs PHASE STATION 53100A, User Manual

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PhaseStation 53100A User’s Manual V1.04 25-Apr-2022 98
Show cross ADEV traces when available ( Ctrl-j )
Cross Allan deviation measurements take advantage of all four instrument input
channels, potentially enhancing the short-term ADEV measurement floor by an order of
magnitude. On the 53100A, these measurements are performed when the DUT and
reference sources are routed to both of their respective front-panel input jack pairs with
internal or external splitters and the
Measure single DUT with cross ADEV statistics
measurement role is selected. Cross ADEV measurements with dual reference sources
are also possible.
If this option is toggled off, cross ADEV plots will be rendered as conventional ADEV
measurements when the Allan deviation measurement view is selected with the
a
hotkey. Measurement performance enhancements associated with cross ADEV
processing will be unavailable.
For more information about cross ADEV measurements with the 53100A, see the
description of the
Measure single DUT with cross ADEV statistics measurement role on
page 136.
Show original traces in computed xDEV displays ( F6 )
This option can be used to show or hide the original xDEV traces that contribute to an N-
cornered hat display, as seen in the example above.
Alternatively, when cross ADEV measurements are in use, this command determines whether
the standard ADEV traces for the primary and secondary phase records are displayed alongside
the primary trace that represents the cross ADEV solution. To avoid confusion, these traces are
always rendered with a broken (dashed) line style. They can be hidden with
F6 or by simply
toggling the entire plot’s visibility with the v hot key.
Show correlation gain for selected noise trace ( Ctrl-g )
Intended primarily as a diagnostic aid, this option is supported when viewing phase
noise or AM noise plots from instruments such as the PhaseStation 53100A that support
real-time cross correlation. When enabled, the FFT segments in the selected phase noise
or AM noise plot will be color-coded for identification. A table will appear as an overlay
in the graph area that displays the number of cross-spectrum averages performed so far
in each color-coded segment, along with the theoretical improvement in ADC noise
expressed in dB.
The estimated improvement in each segment’s effective noise floor is calculated as
5 * log
10
(N) dB, where N is the segment’s number of averages.
Trace smoothing is not performed on the selected noise plot when this option is
enabled.