Fluke DTX-1800, Technical Reference Handbook

Page: 198 / 398

DTX Series CableAnalyzer
Technical Reference Handbook
7-40
Table 7-3. Event Types (cont.)
Event Possible Causes
The signal is attenuated
below the background
noise level before the end
event is reached.
No fiber is attached to the OTDR port, the fiber is too short, or there is a bad connector or
broken fiber somewhere near the tester. May also occur if the fiber has very high loss, or
if the tester is in Manual OTDR mode and the Pulse Width is too narrow.
If the OTDR trace and event table show that the fiber is very short, check for bad
connections and broken fibers within a few meters of the tester.
The tester did not find an
end event.
This can occur in Manual mode when the selected range is too short.
In Auto mode, Out of Range can occur when the cabling is much longer than the
module's range. Rarely, very bad connections along the cabling can cause the OTDR to
select a range that is too short.
For Manual mode, select a higher range in Setup.
For Auto mode, compare the expected cabling length to the module's test range. If the
length is within range, try testing in Manual mode with the maximum range setting.
Weak Signal
Out of Range