EXFO FTB-5600 Distributed PMD Analyzer User Manual
Page 72
Managing Results
66
FTB-5600
Section Status
Status
In PMD column
In Status column
Suggestion
Valid
The PMD value is
shown
The section is valid
Under Range
(UnRg)
The first or last point in
the section has a PMD
value that is too weak
according to the
residual PMD of the
measurement.
A significant portion of
the cumulated PMD
curve for the section is
to weak according to
the measurement
resolution.
Select a lower scale or
a smaller PMD range in
the acquisition
parameters
Over Range
(OvRg)
The first or last point in
the section has a PMD
value that is too high
according to the
selected PMD range.
A significant portion of
the cumulated PMD
curve for the section is
too high according to
the selected PMD
scale.
Select a higher scale or
broader PMD range in
the acquisition
parameters.
Low SNR
(LoSNR)
The dynamics of the
first or last point in the
section are not
sufficient to measure
PMD correctly for the
section.
The dynamics on the
section is not sufficient
to measure the
cumulated PMD curve
correctly.
Lessen the losses
through the
connectors, increase
the number of
averagings or increase
the pulse size.
For more information,
see Use an Optimized
Number of Averagings