EXFO FOT-930 Multifunction Loss Tester - Manual (Page 49)

Multifunction Loss Tester 41
7 Measuring Optical Return Loss
Optical return loss (ORL) is the total effect of multiple reflections and
scattering events within a fiber-optic system.
The FOT-930 Multifunction Loss Tester is equipped with an ORL meter to
measure ORL for singlemode fibers. The ORL meter uses the F
AS
T
ES
T SM
(singlemode) port only.
The following functions are available on your ORL meter:
ORL meter port
Open lists to change cable/fiber
name of next saved data.
Press Store to save current ORL
value under displayed name.
Measured ORL
(positive value)
Current ORL wavelength
Open list or press Wavelength
to switch between singlemode
wavelengths.
Press ORL Zero to calibrate
the ORL meter sensitivity.
Press Default ORL Zero to revert to
factory-default sensitivity.
Press ORL Reference to set reference
using ORL calibrated patchcord (best).
Press Loopback Ref. to use
any other patchcord.