Fluke DTX-1800, Technical Reference Handbook

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Using the OTDR Module
Looking at OTDR Test Results
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Table 7-2. OTDR Results Screen Measurements
Item Description
Length The length of the fiber in the cabling. If the measured length seems wrong, check the Index of
Refraction in Setup. The length does not include launch and receive fibers if launch fiber compensation
is enabled.
Tip: In some cable types, some or all of the fibers may be longer than the cable jacket and some fibers may
be longer than others in the same cable. To adjust the length measurements to represent cable jacket
length, change the index of refraction until the measured length matches the jacket length.
Overall Loss The end-to-end loss of the cabling, excluding the OTDR connection and the end event. The loss does
not include launch and receive fibers if launch and receive fiber compensation are enabled.
Overall Loss does not include the losses of the first and last connectors in the cabling if you did not use
launch and receive fiber compensation.
If the test ran at two wavelengths, the highest loss of the two wavelengths is reported.
Largest Event The event with the largest loss.