EXFO FOT-930 Multifunction Loss Tester User Manual
Page 50

Measuring Optical Return Loss
42
FOT-930
Performing ORL Reference and Setting ORL Zero Value
The ORL measurement procedure is outlined below:
Performing ORL Reference and Setting ORL
Zero Value
The ORL zero measurement eliminates the effects of backreflection on the
link before the component under test, so your unit displays only the
backreflection of this component.
You should set a new ORL zero:
when you change the measurement patchcord (the one connected to
the DUT, not the reference patchcord)
when you remove a connection between the unit and mandrel
To set the ORL zero value (all wavelengths at once):
1. Press Menu, then select ORL Meter.
2. Press ORL Zero (F1/F2 key).
3. Connect a patchcord to the F
AS
T
ES
T SM port.
Save
results
Select
wavelength
Termination
Component
under test
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