EXFO FTB-5600 Distributed PMD Analyzer - Manual (Page 43)

Setting up and Operating your Distributed PMD Analyzer
Distributed PMD Analyzer 37
Performing an Acquisition
2. Set the distance range, in kilometers, from the list of available values.
You can also type in the value directly. Reducing the range to the part of
the link that you want to measure will increase measurement speed
and decrease the resulting file size. If you do not know the length of the
link, you can rely on the OTDR trace to estimate it.
3. Press Start.
The acquisition starts. You can see the remaining time in the status bar.
Performing a Standard Acquisition
The acquisitions are more optimized for characterizing the link correctly
rather than for the acquisition time. The default PMD scale for this mode is
20 ps. EXFO recommends setting the accuracy to the standard level and
the sensitivity to the medium level for an acquisition of about 30 minutes.
The accuracy of the measurement changes the number of SOPs and
residual PMD. A higher level of SOPs will yield a more accurate result, but
longer acquisition time.
Accuracy Number of SOPs PMD Resolution (fs)
Low 50 1333
Medium 100 148
High 200 50