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the middle of the screen. This allows you to devote all
your attention to tuning the laser, without having to worry
about the Vega settings.
4.4.2.3.1. To use the Vega to fine tune laser power
1. From the main measurement screen, select “Menu”
and enter. Select “Tune” and press the Enter key.
2. Set the power expansion scale to ±50% ,±25%, ±10%,
±100% or ±75% as desired, pressing the “±50%” soft
key. The default value is 50%. If the laser power will
change a lot, use a large value; if a little, use a small
value.
3. Select “Graph” and enter to set the horizontal sweep
time to the rate desired. The default value is 1 minute.
Save before exiting if you want this to be the new
default. Note that saving the graph value will also
save the ±XX value as default.
4. If you press “Max” it will set the NOW value on the
screen to the present value. You can then compare
the MAX value to the NOW value.
4.4.2.3.2. Measuring with the Tune Screen
You can now use the tune screen to adjust and maximize
your laser power. (See Figure 4.1). Note that
you can not only see the trend, but also see if you have
already reached a higher value before the numbers on
the left side show you the present power reading as well
as the highest one reached till now. Press “Max”
to reset the maximum reading to the present time. Now
measure the power of the laser and adjust the laser until
you determine that the power has reached a maximum.
