Fluke DTX-1800 Technical Reference Handbook page 203

Detail
Warnings Cannot measure overall loss:
• 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.
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:
• The wrong fiber type is connected.
• A multimode fiber is connected, but the connection is dirty.
Table 7-4. OTDR Measurement Details (cont.)
Description
Using the OTDR Module
Looking at OTDR Test Results
7
-continued-
7-45