EXFO FTB-3930 MultiTest - Manual (Page 67)

Multifunction Loss Tester 61
10 Identifying Fiber Faults
Visually
The visual fault locator (VFL) helps you identify bends, faulty connectors,
splices and other causes of signal loss.
From its dedicated port, the VFL emits a red signal which becomes visible
at the location of a fault on the fiber. This signal can be continuous
(CW, the default) or blinking (1 Hz).

If you switch to power meter or ORL meter, a VFL status pane is always
displayed.

The VFL status is indicated with a LED in the status bar and on the
platform front panel.
Note: The platform front panel always shows the source, VFL, ORL meter or talk
set port status (even when you use other applications).
W
ARNING
When the VFL is active, the VFL port emits visible laser radiation.
Avoid exposure and do not stare directly into the beam. Ensure that
any unused port is properly protected with a cap.
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Visual fault locator (VFL) port