EXFO FTB-3930 MultiTest User Manual
Page 68
Identifying Fiber Faults Visually
62
FTB-3930
To activate the VFL and inspect a fiber:
1. Connect the fiber under test to the VFL port (see Cleaning and
Connecting Optical Fibers on page 12).
2. From the main window, select the Source/VFL tab.
3. In the VFL pane, slide the Power switch to On.
4. To switch between blinking (1 Hz) and continuous (CW) signals, use
the Modulation dial.
5. Without looking directly into the beam, examine the fiber. If light is
coming out of the rubber jacket or on the side of the ferrule, the fiber is
defective.
6. Deactivate the VFL by sliding the Power switch to Off.
Data display
Status LED
Power switch
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