FPM-300/FLS-300/FOT-300
26
7 Troubleshooting
Solving Common Problems
Error Codes and Descriptions
ER: error code displayed until you press a key.
WR: warning code displayed for 3 seconds, then unit returns to normal.
Problem
Possible Cause
Solution
Unable to change power meter
wavelength.
Unit receiving Auto
(or REF) signal from
source.
Only one wavelength
in list.
Change source mode
(see
page 16), then retry.
Add wavelengths.
Unable to change power meter
dB unit or reference power.
OR
Changed unit or reference
value are replaced by other
values after a while.
Unit receiving REF
signal
from source. See
to switch between
available modulations.
Wait a few seconds
until power value is
received, then retry.
Many beeps, unstable optical
power and blinking
Auto
(or
modulation) indicator.
Power too low to
recognize Auto mode
(or modulation).
Increase source power
or switch source to
CW.
Reference power different than
source output power.
Received power outside
detector’s range.
Change source output
power.
Error
Code
Description
Solution
LIGH
Light detected while nulling offsets.
Nulling is not performed.
Correctly place protective cap on
detector port, then retry.
10/11/22 Embedded software problem.
Contact EXFO.
13
EEPROM corrupted (would occur
during unit initialization).
Unit must be recalibrated. Contact
EXFO.
20
Wavelength sent from compatible
source emitting in Auto mode is not
available on your power meter.
Change source wavelength or
switch source to CW.
28
Unstable optical power detected.
Increase source power in Auto
mode, or switch source to CW.
