EXFO CT440 Series, User Manual

Page: 91 / 169

Troubleshooting
CT440
85
Warning & Error Messages
[warning code 108]
Numerous mode hops or
multimoding behavior

The TLS is out of
specification due to
multimode behavior or
numerous mode hops.

The reference file is not
located in the correct
folder or is corrupted.

Make sure the source performances meet
the requirements detailed in Product
Features on page 1.

Make sure that the coherence control is
disabled on the TLS.

Make sure the reference file is located in
the proper Calib folder:
C:\Users\Public\Documents\EXFO\CT440\
Calib
Make sure the reference file is located in
the proper Calib folder:
C:\Users\Public\Documents\EXFO\CT440\
Calib

Reset the reference file as follows:
1. In the
Calib
folder, delete the reference
file
File<serial number>.dat
file.
2. Restart the program.
The original factory calibration file is
automatically downloaded from the
CT440.
3. Perform a power referencing (see
Performing Power Referencing on
page 28).

Make sure to perform a wavelength
referencing operation in the laser (see the
corresponding laser user manual).
[warning code 109]
High TLS input power
variations: check TLS
sources The power in the input port
varies randomly above the
specified value.
Make sure the source performances meet the
requirements detailed in Product Features on
page 1.
[warning code 110]
Too high input power
during the scan: check
input power
The power in the input port
is above the specified value.
Decrease the input power to meet the
specifications detailed in
Technical
Specifications
on page 7.
[warning code 111 to 114]
Power on
DET1/DET2/DET3/DET4
too high: check set up The power on the detector
is above specified value.
Decrease the input power to meet the
specifications detailed in Technical
Specifications on page 7.
Do not use and optical amplifier before the
detector.
[warning code 115]
Spurious input power:
check set-up Optical power has been
detected where it is not
supposed to happen.
Verify that the lasers are connected to the
correct input ports of the CT440.
Error or warning Possible Cause Possible solution