EXFO FTB-5500B PMD Analyzer - Manual (Page 99)

Troubleshooting
Polarization Mode Dispersion Analyzer 91
Solving Common Problems
Specifications not
guaranteed, retesting
recommended.
The PMD value might no be
within the unit’s
specification:
³
Your PMD Analyzer
measures low PMD
values from a weak
coupling device (for
example, PMF) and
analyzer input
polarization state is not
appropriate.
³
External parasitic signal
during measurement
(for example, live fiber).
³
Move fiber or device
slightly to change
polarization state and
retest.
³
Remove parasitic signal
and retest.
Message Possible cause Solution