EXFO OTDR 2 - Manual (Page 96)

Analyzing the Results Manually
88 OTDR
Getting Event Loss and Maximum Reflectance
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Reflectance is the ratio of reflected light to input light.
Note: If you are testing in Real time, the reflectance value you will get is not
necessarily accurate.
To get event loss and maximum reflectance:
1. From the main window, select the Measure tab.
2. At the bottom of the window, tap Event. Markers a, A, B and b appear
on the graph.
3. Zoom in and position marker A at the end of the linear area preceding
the event to be measured. For more information, see Using Zoom
Controls on page 109 and Using Markers on page 83.
4. Position submarker a at the beginning of the linear area preceding the
event to be measured (must not include any significant events).