Fluke Versiv Series Technical Reference Handbook page 385

Table 14. Event Types in the Event Table (continued)
End
The end of the fiber or a
loss greater than the end
threshold.
Hidden End
The end of the fiber is in
the attenuation dead zone
of the previous event.
Hidden
The event is in the
attenuation dead zone of
the previous event.
Chapter 11: The OptiFiber Pro OTDR Module
The End event always shows N/A for loss
because backscatter measurements are not
available on both sides of the event.
For SmartLoop tests, the End event for Fiber A
is the far end of the loopback cord.
The tester does not give a PASS/FAIL status to
this event, unless you use a custom test limit
that includes a limit for segment attenuation,
and the segment before the End event fails.
The tester cannot give an accurate distance to
the end of the fiber because the end is hidden.
The tester does not give a PASS/FAIL status to
this event.
The tester detected the event, but does not
have enough information to measure its loss
separately from the previous event. Thus, the
tester includes the loss of the hidden event
with the loss of the previous event. The loss of
the hidden event shows as N/A.
A hidden event is often the end of a patch
cord that is hidden in the dead zone made by
the first connector on the cord.
To get a better view of hidden events, do a
Manual OTDR test with the Averaging Time
set to Best Resolution. Narrow pulse widths
can also help you see hidden events.
If the event is not a connection, inspect the
fiber near the location of the event. Use a
visual fault locator to see faults such as cracks
or breaks in the fiber. Ghosts anywhere on the
fiber and splices near the end of the fiber can
also cause hidden events.
The tester does not give a PASS/FAIL status to
this event, unless the test limit has a limit for
reflectance and the hidden event exceeds the
limit.
OTDR Results
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