Fluke CableAnalyzer DSX-5000, Technical Reference Handbook, Page: 535 / 700

Chapter 15: Diagnose Problems in Fiber Links
Causes of OTDR Test Failures
499
Fiber length fails or the length is incorrect

The fiber is broken or there is an open connection where the trace
shows the fiber end.

The wrong fiber type is selected on the
TEST SETUP
screen.

The index of refraction needs adjustment. To change the
IOR
setting,
tap
Fiber Type Settings
on the
TEST SETUP
screen.

The wrong test limit is selected on the
TEST SETUP
screen.
The overall result is FAIL, but no event shows FAIL, or an event shows FAIL,
but does not exceed any limit

Some conditions make the OTDR test fail even when all measurements
are within the limits. For example, the test fails if
Tail
compensation was enabled, but you did not connect a tail cord. These
conditions show as warnings when the test is completed. To see
warnings caused a
FAIL
result, tap on the
OVERALL FIBER RESULT
screen (see Figure 145 on page 354).

The test limit includes a limit for the attenuation coefficient, and the
attenuation coefficient of the fiber segment before an event is too
high. To see the attenuation coefficient for the segment before an
event, tap the event on the
EventMap
screen, tap the information
window for the event, then tap the
SEGMENT ATTENUATION
tab on
the
EVENT DETAILS
screen.
(continued)
Table 20. Causes of OTDR Test Failures (continued)