EXFO FTB-5600 Distributed PMD Analyzer - Manual (Page 41)

Setting up and Operating your Distributed PMD Analyzer
Distributed PMD Analyzer 35
Performing an Acquisition
Performing a Quick Check Acquisition
The main purpose of the quick check is to have an estimate of the
cumulative PMD of the link to select the appropriate PMD scale.
Using the Quick Check OTDR trace and cumulative PMD curve, you can
verify the following:
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The injection level: it should be within the injection level accepted
range, as it is the case with an OTDR. If it is not, correct the connection
at the instrument. This will improve the dynamic range.
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The link length: the range value may be updated with the link length
seen on the trace. This reduces the size of the file and accelerates both
processing and acquisition times.
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The link PMD maximum value could be used to set the PMD scale of
the advanced settings. This may have a major impact on the
acquisition time.
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Where the PMD trace ends. If it ends very far from the end of the link,
then the number of averages could be increased to improve the
dynamic range.
This mode uses a low number of SOPs, therefore the measurement will not
be accurate. You should not use this acquisition mode to characterize
entire links. The default PMD scale for this mode is 20 ps.