EXFO FOT-930 Multifunction Loss Tester - Manual (Page 52)

Measuring Optical Return Loss
44 FOT-930
Performing and Saving ORL Measurements
5. Connect one end of a patchcord to the F
AS T ES T SM port of your unit
leaving the other end unconnected.
6. Perform an ORL reference as follows:
Note: During the reference, the patchcord end should remain in the air;
reflections occurring at a fiber-to-air interface correspond to a constant of
14.7 dB.
Use the left/right function arrows to display
ORL Reference and press the F1 or F2 key
to select it.
In the ORL Reference message box, press
OK (Enter).