EXFO OTDR 2 - Manual (Page 41)

Preparing Your OTDR for a Test
OTDR 33
Setting the Analysis Detection Thresholds
4. Under Detection Thresholds, enter the desired values in the
appropriate boxes.
OR
If you want to revert all settings to their default values, tap the Revert to
Factory Settings button.
I
MPORTANT
The Revert to Factory Settings button resets all the values in the
Link Definition tab.