EXFO FTB-3930 MultiTest - Manual (Page 35)

Multifunction Loss Tester 29
6 Measuring Optical Return Loss
Optical return loss (ORL) is the total effect of multiple reflections and
scattering events within a fiber-optic system.
The FTB-3930 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:
FT
B-
39
30
MUL
TI
TE
ST
ORL meter port
Measured ORL
(positive value)
Current ORL
wavelength
ORL meter
sensitivity
Value under
threshold
Add current value
to Tested fibers
(to actually save
data, press Save
on function bar)
Set reference using
ORL calibrated patchcord (best)
Set reference using
any patchcord
Change name of
next saved fiber
Switch between
singlemode
wavelengths
Calibrate ORL meter
sensitivity