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OP940-SW
Front Panel Operation
OPM Mode
This mode controls the optical power meter on the unit, but not the source. OPM mode
supports all the functions of a state-of-the-art optical power meter such as multiple
wavelength calibrations, absolute mode (dBm), and relative mode (dB).
This is a preferred mode for performing measurements using an external optical source.
The indicators below the power reading visually depict the measured power in terms of
the current gain stage of the detector and whether the unit is measuring on the high or
low end of that gain stage.
The unit, by default, operates in “Auto Range” mode meaning that it will find the gain stage
in which it will be able to most accurately measure the optical power.
However, the unit has an option to operate in “Range Hold” mode wherein it will remain in
the same gain stage regardless of the power incident on the detector.
Note: In “Range Hold” one should not be operating at the high or low end of the range.
This will increase the error of the measurement.
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