Fluke OF-500-01 OptiFiber, Technical Reference Handbook, Page: 108 / 278

OF-500 OptiFiber Certifying OTDR
Technical Reference Handbook
3-32
Table 3-4. Event Types (cont.)
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 on page 3-14 or the online help for examples of tailing.)
Caused by a splice, bend, or a low-reflectance connection , such as an angled physical
contact (APC) connection.
If the loss event is not caused by a splice or APC connection, inspect the cable for tight
bends. Use a visual fault locator to verify the fault.
Event Possible Causes and Solutions
GHOST SOURCE
A reflective event that is
causing a ghost.
LOSS
A point where the level of
reflected light suddenly
decreases.