Fluke DTX-1800, Technical Reference Handbook

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Using the OTDR Module
Looking at OTDR Test Results
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7
Table 7-4.
The attenuation per kilometer for the fiber segment before the event. This value may not be shown if it
could not be measured accurately. This can occur on short segments or if the connector before the
segment has a large deadzone.
The power of the light reflected back to the OTDR from an event. A smaller (more negative) reflectance
value means less light is reflected back. For example, a good connection may have a reflectance of -45 dB.
A dirty connection that reflects more light back to the OTDR may have a reflectance of -20 dB.
Reflectances that exceed the tester's measurement range are shown as the largest measurable value and
are preceded by a “>” (greater than) symbol.
Reflectance measurements are affected by the backscatter value entered in Setup.
OTDR Measurement Details (cont.)
-continued-
Detail Description
Segment
Attenuation
Coefficient
Reflectance