Setting the Reference Level
OA 5000 Series User Manual
2 ---13
The second application for reference mode is approximating signal power
after the source has been attenuated.
Step 1:
Set the attenuator to its minimum reference level.
Step 2:
Measure the power (in dBm) from the fiber connected to the
output optical connector.
Step 3:
Set the reference value to this number.
Once this level has been set and the OA 5000 is in reference mode, the
displayed attenuation is the negative of the power level in dBm. For exam-
ple, if the power level is --- 2.5 dBm when the attenuator is at its minimum
attenuation level and this is entered as the reference level, then the display
will read 2.5 dB when set to REF mode. Then, if you increase the attenuation
by 10 dB, the display will read 12.5, which is the negative of the power level
in dBm.
Approximating Signal
Power
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