Fluke DTX-1800, Technical Reference Handbook

Page: 203 / 398

Using the OTDR Module
Looking at OTDR Test Results
7-45
7
Table 7-4.
•
Overall loss cannot be measured, either because no backscatter was detected or the fiber is too short
for attenuation to be measured.
•
The fiber is too short for the tester to detect events after the first deadzone.
•
There is a bad connector or broken fiber within a few meters of the tester.
•
There are bad connections on the fiber.
•
The launch or receive fiber is too short.
•
There is a problem with the launch fiber or patch cord.
•
The pulse width is too long.
•
The wrong fiber type is connected.
•
A multimode fiber is connected, but the connection is dirty.
OTDR Measurement Details (cont.)
-continued-
Detail Description
Warnings Cannot measure overall loss:
Fiber detected on other OTDR port:
There is a fiber connected to the unused OTDR port. Reflections from the fiber can affect measurements
on the port being used. Remove the fiber.
A singlemode fiber is connected to the multimode OTDR port: