Anritsu MT9812B, Operation Manual, Page: 134 / 144

Section 7 Maintenance and Re-transportation
7-10 .
7.4.3 Optical Sensor
The measured value is low.
The measured values do not
stability.
The numerical values displayed
are slow to change.
The indication does not change
even if light is input.
Zero setting will not end.
Zero setting results in error.
Phenomenon Action
Set the setting of the calibrated wave
length to that of the wavelength of
the measuring beam.
Clean the end face of the fiber cord
or the connector.
7.1 Daily Care and
Cleaning
If the problem remains unsolved,
repair will be necessary. In this
case, contact the service center.
Clean the end face of the fiber cord
and connector.
7.1 Daily Care and
Cleaning
Set the mode to the modulation
mode to measure modulated light
and also set the modulation frequ-
ency correctly.
Set a shorter time for measurement
interval.
Set the mode to the CW mode to
measure CW light.
When the ambient temperature is
high, processing takes longer.
Please wait until the processing
ends.
Affix the metallic light shading
cap on the front panel properly and
perform zero setting.
Affix the metallic light shading
cap on the front panel properly and
perform zero setting.
Possible cause
The settings of the measuring beam
and calibrated wavelength are
different.
As light of high power level was
entered while the connector remains
stained, the ferrule burned out.
The end face of the fiber cord or
the connector is stained.
The modulated light is measured in
the CW setting.
The time set for measurement
interval is long.
The CW light is measured in the
modulation mode setting.
The ambient temperature is high.
Shading of light is insufficient.
Shading of light is insufficient.