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Chapter 7 Power meter and Source options of the OTDR Modules
Performing the insertion loss measurement
Performing the insertion loss measurement
Setting the zero
value of the
power meter
Carrying out
the reference
98
It is not possible to use simultaneously the Source function and
the Powermeter function, when both options are set onto the
OTDR module, as they use the same connector.
Power measurement is automatically updated in consequence. The
value «<-50 dBm» is displayed when the laser is switched off and if
the source output is looped on to the power meter input.
1
Connect the light source to be tested to the rear connector (see
"Connection to the power meter" page
S
2
ETUP
In the
menu, choose the units dBm or Watts.
S
3
TART
Press the
The result will appear in the results page and can be memorized in
the table (see
"Table of results" page
S
4
TART
Press the
Using light source and power meter options, an insertion loss measure-
ment can be performed, having previously carried out a reference
measurement.
1
Fix the plug over the optical input of the power meter so that no light
can reach the photodiode of the power meter. If the zero adjustment
is made without this plug, an error message may be displayed, as
the photodiode will detect too much light.
2
Results
page, press Powermeter config. >
In the
and validate.
It is important to set the zero of the power meter before making any
measurements where accuracy is required, as the noise from the ger-
manium photodiode fluctuates over time and with variations in tem-
perature.
Using two T-BERD/MTS platforms, with an OTDR module including a
laser source option and a Power meter option, an insertion loss
measurement in continuous wave can be performed.
User Manual
770000102/08
/S
TOP
key to start the measurement
/S
TOP
key to stop the measurement.
92).
.
95).
Zero
soft key
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