8 identifying fiber faults visually, Arning – EXFO PPM-350C PON Power Meter User Manual
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PPM-350C
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8 Identifying Fiber Faults
Visually
Note:
This feature is available only if your unit is equipped with a VFL port.
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 (the default) or blinking
(1 Hz).
When the VFL is on, the rightmost status LED will also be on.
To activate the VFL and inspect a fiber:
1. Connect the fiber under test to the VFL port (see Cleaning and Connecting
2. Press and hold down
for a few seconds to switch between ON CW
(continuous signal) and ON 1HZ (blinking signal).
3. 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.
4. Deactivate the VFL by pressing and holding down
for a few seconds to
switch between the signals (ON CW and ON 1HZ), until you reach OFF.
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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