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EXFO FOT-930 Multifunction Loss Tester User Manual

Page 50

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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.

Set

ORL zero

Measure

ORL

Save

results

Perform

ORL reference

Set up thresholds

(see page 26)

Null offsets

(see page 32)

Select

wavelength

Termination

Component
under test