Fluke DTX-1800, Technical Reference Handbook

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DTX Series CableAnalyzer
Technical Reference Handbook
7-38
Table 7-3. Event Types (cont.)
Event Possible Causes
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.
The event is a duplicate
reflection caused by light
bouncing back and forth
between connectors.
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.
Find the Ghost Source in the event table to determine where to look for the fault. The
ghost source is always before the ghost. The event table does not show ghosts that
occur after the end event.
If the ghost source is a hidden event, the tester may not identify a ghost event as a
ghost.
Ghost Source
Ghost