Grandway Optical Instruments Series User Manual

FHO5000
12
Abnormal Condition
The situation that there is no reflection peak at the end of a trace shows above
should be paid attention on. If the distance of the tested fiber is available and the
distance shown on OTDR is not equal to the original distance, this shows that the
fiber might be broken down or twisted and the bending radius of it is over limited.
The distance shown on OTDR is the position of the fault point.
This phenomenon is often used in maintenance. If a fiber is uncertain, we can
bend a fiber and make sure the bending radius is over limited, then use real time
testing function of the OTDR to confirm the fiber.
This situation often happened in a long distance testing, caused by under-range
dynamic range of the OTDR that the energy of it can not support a long distance
transmission or caused by a under-range preset testing range of distance or pulse
width corresponding to the actual fiber length. To avoid this situation, adjust the
testing distance and the pulse bigger and extend the sampling time.
Distance is Too long

Grandway Optical Instruments Series Specifications

General

Brand	Grandway
Model	Optical Instruments Series
Category	Measuring Instruments
Language	English