Chapter 4
Power meter and Source functions on the OTDR test port
Performing an insertion loss measurement
84
User Manual
700MAN201 Rev. 002
2
On the power meter results page section, select the measurement unit: dBm or
Watts.
3
The power level is displayed in real time when there is light. To keep the
displayed value, press on
Keep Result
icon. The value is then displayed in the
table (but not saved yet) - see
4
Press
Save
softkey to record and report the power level measurement.
Performing an insertion loss measurement
A combo light source and power meter is often used to perform an insertion loss
measurement. Few steps must be carried out to get a reliable and accurate loss
measurement.
Setting the zero value of the power meter
1
Close the protective cap of the OTDR port (so no light can be seen by the power
meter photodetector).
2
In the Setup menu, press
Zero
.
3
Wait until the dialog box
Offset nulling completed
is displayed.
4
Hit any key to continue.
Performing a reference
Using two equipments, with an OTDR module including a laser source option and a
Power meter option, an insertion loss measurement in continuous wave can be
performed.
Side by side reference
Both units are connected together which requires to have them at the same location.
It is important to set the zero of the power meter especially to get accurate
results, as the noise from the germanium photodiode may fluctuate over
time and with temperature variations.
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Содержание OTDR 41 A Series
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