Fluke OF-500 OptiFiber, Technical Reference Handbook

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OF-500 OptiFiber Certifying OTDR
Technical Reference Handbook
3-34
Table 3-4. Event Types (cont.)
Event Possible Causes and Solutions
GHOST SOURCE
A reflective event that is
causing a ghost.
Tip: On some traces with multiple ghosts, only the first ghost may be identified in the
event table. You can usually determine that other reflections are ghosts because they
occur at multiples of distances to connectors and they show almost no loss.
Caused by a dirty or unseated connector, highly-reflective connector, a connector with the
wrong polish, a sharp bend, or a crack in a fiber.
Verify that the connector is seated properly. Inspect connectors that cause ghosts. If a
connector does not seem to be the ghost source, use a visual fault locator to check for
bends or cracks near the ghost source.
A ghost may have multiple sources. The tester identifies only one possible source. Look for
reflective events with high loss or excessive tailing for other possible sources. (See Figure
3-7 or the online help for examples of tailing.)
LOSS
A point where the level of
reflected light suddenly
decreases.
Caused by a splice or bend.
If the loss event is not caused by a splice, inspect the cable for tight bends. Use a visual fault
locator to verify the fault.