
Chapter 7
Power meter and Source options of the OTDR Modules
Performing the insertion loss measurement
98
User Manual
770000102/08
1
Connect the light source to be tested to the rear connector (see
"Connection to the power meter" page 92
).
2
In the
S
ETUP
menu, choose the units dBm or Watts.
3
Press the
S
TART
/S
TOP
key to start the measurement
.
The result will appear in the results page and can be memorized in
the table (see
).
4
Press the
S
TART
/S
TOP
key to stop the measurement.
Performing the insertion loss measurement
Using light source and power meter options, an insertion loss measure-
ment can be performed, having previously carried out a reference
measurement.
Setting the zero
value of the
power meter
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
In the
Results
page, press
Powermeter config. >
Zero
soft key
and validate.
Carrying out
the reference
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.
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.
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.
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