EXFO FTB-3930 MultiTest - Manual (Page 38)

Measuring Optical Return Loss
32 FTB-3930
Performing and Saving ORL Measurements
Performing and Saving ORL Measurements
You can define ORL thresholds (see Setting Pass/Fail Thresholds on
page 16) before or after measuring ORL. ORL values below thresholds are
displayed in red.
To measure ORL:
1. If necessary, perform an
offset nulling (see Nulling Electrical Offsets on
page 22).
2. From the main window, select the ORL Meter tab.
3. Scroll through the Wavelength list to select a singlemode wavelength.
4. Verify your patchcords and clean them properly (see Cleaning and
Connecting Optical Fibers on page 12).
Note: If the F
AS
T
ES
T SM port of your unit is equipped with an APC connector, use
EXFO’s optional ORL calibrated patchcord.