EXFO FTB-7000 OTDR Series for FTB-500 - Manual (Page 198)

Analyzing Traces and Events
184 OTDR
Defining a Reference Trace
To define a reference trace manually:
1. Load the trace you want to use as the reference trace (see Opening
Trace Files on page 179).
2. From the main window, select the Result tab.
3. Select the trace you want to use as reference (ensure that it is
highlighted) and press Set as Reference.
The name of the file set as reference is displayed in red and appears
to its left.
Note: If you want to remove the reference state, simply press the Remove
Reference State button.