EXFO FastReporter 2 - Manual (Page 141)

Working with OTDR Files
Post Processing Software 131
Changing the Main Measurement
3. In the Main Measurement Selection window, select the required
wavelength and click OK to set it as the main measurement.
Note: When you hover the mouse pointer over the selection area of a trace which
is not the main measurement, a tooltip with the fiber ID and measurement
wavelength is displayed.