EXFO FTB-5700 Single Ended Dispersion Analyzer for FTB-200 v2 - Manual (Page 76)

Troubleshooting
70 FTB-5700
Solving Common Problems
Unable to ensure a correct
PMD measurement over the
selected wavelength range
because of a combination of
saturated detector and low
optical power.
³
Fiber end is too
reflective.
³
Unsuitable selected
wavelength range for
the measured FUT (out
of the FUT bandwidth).
³
Unsuitable FUT. The
FUT must not cut the
1550 nm wavelength.
³
If you have put a
reflective termination at
the end of the fiber,
remove it.
³
Select a wavelength
range that suits the FUT
and the instrument
range. You can set the
wavelength range in the
Acquisition tab of the
Setup window.
The measurement range is
too short for a PMD
measurement
Measurement range is too
short.
Try to use a larger
measurement range.
Impossible to find a valid
measurement range.
³
Too much loss in the
fiber under test.
³
Unsuitable FUT. The
FUT must not cut the
1550 nm wavelength.
³
Clean the fiber end.
³
Add a reflective
termination at the end
of the fiber.
Message Possible cause Solution