EXFO FOT-930 Multifunction Loss Tester - Manual (Page 90)

Troubleshooting
82 FOT-930
Solving Common Problems
Unable to change
wavelength in Power Meter
pane.
Power meter receives
auto-wavelength (Auto-ID)
signal.

Change source’s emitting
mode.

Deactivate wavelength
detection.
Unable to change dB unit
or reference power in
Power Meter pane.
OR
Unit or reference value you
changed are replaced by
other values after a while.
Power meter receives
reference power value from
compatible source.
Wait a few seconds until
power value is received, then
retry.
When measuring ORL, you
get Too Much Power.
Measured reflected power
is higher than emitted
power. The ORL reference
is incorrect.
Always perform ORL
reference before each ORL
measurement.
When measuring ORL, you
get ORL exceeds.
Reflection is below
sensitivity (Max ORL) of
ORL meter.
Perform an ORL zero
measurement to increase the
sensitivity of the detector.
Ensure mandrel is correct and
that patchcord and
connectors are in good
condition.
Problem Possible Cause Solution