OPHIR vega User Manual page 68

from the detector as well as a considerable noise
fluctuation. Nevertheless, you can measure these low
values by using the average function and pressing offset
to eliminate the detector zero offset. In order to measure
very low powers do as follows:
1. Select "Menu", press the Enter key and select
"Configure". Choose the appropriate value you want
to average over and save it and then exit.
2. Now block the power source you wish to measure,
wait for a few measurement periods and press
"Offset" to subtract the zero offset.
3. Now unblock the power source and measure.
4. For a detailed description of the average function,
see Section 4.4.2.4.
Note:
The average function does not work with autorange
or dBm scales.
5.4.8. Tune and Power log
The Tune function, an exclusive Ophir option, makes
adjusting your laser to its maximum power easier than
ever before. Unlike a bargraph or mechanical meter, this
display shows graphically what came before as well as
the current reading and the trend. This allows you to see
at a glance if you have reached maximum power.
The Vega also has the option of graphing the laser power
vs. time. While measurements are being taken, the Vega
will record data until the screen is full, or "Reset" or one
of the navigation keys is pressed.
If the laser power is fluctuating, the Vega can also
display the average power readings with averaging
periods varying from 1s to 1 hour.
These functions are the same for thermal type sensors
and for photodiode sensors.
details.
The functions described in Section 4.6
Display Screens apply to photodiode sensors as well.
See Section 4.4.2.3 for
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