EXFO FTB-3930 MultiTest - Manual (Page 85)

Troubleshooting
Multifunction Loss Tester 79
Solving Common Problems
Unable to send a text
message.

Selected port differs
from actual port to
which fiber is
connected.

Receiving unit’s port is
in use.

Remote unit is not
compatible.

On the sending unit, set
the correct port (SM or
MM) in Setup (F
AS
T
ES
T
tab).

Wait until F
AS
T
ES
T
completes, turn source
and ORL meter off or exit
Probe mode (FOT-930).

Make sure remote unit is
an FOT-930, FTB-3930,
FOT-920 or FTB-3920.
On Results tab, a box
indicates “Invld” instead of
a numerical value.
The application is unable to
calculate the F
AS T ES T ORL
value (e.g., at 1310 nm for
short fibers).
Perform the measurements
again.
On Results tab, a box
indicates “- - - -” instead of
a numerical value.
The calculated value makes
no sense (e.g., negative
ORL value).
Perform the measurements
again. Note that the
calculated value is usually
shown on the printed report.
When printing a report,
rightmost columns are not
printed.
The Fiber ID column is too
wide. The width of this
column is determined with
the widest name.
Rename fiber IDs that have a
long name.
When saving data in text
formats, some ORL values
are higher than the
indicated sensitivity.
Saved text files containing
symbols such as “>” may
not open properly in some
applications.
The actual measured value is
used instead, even if it is not
accurate.
Problem Possible Cause Solution