Exfo FTB-3930 MultiTest Manual de usuario descargar pdf (Pagina 38)

Measuring Optical Return Loss

32 FTB-3930

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 m ea su re O RL:

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

ASTEST SM port of your unit is equipped with an APC connector, use

EXFO’s optional ORL calibrated patchcord.

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Exfo FTB-3930 MultiTest Manual de usuario Pagina 38