OPHIR vega User Manual page 57

4.6.2. Power and Energy Density Screens
The Vega gives you the option to measure in units of
power and energy density instead of power and energy.
You input the beam size and the display then calculates
and displays the power or energy density in units of
W/cm² or J/cm². In order to activate this screen do as
follows:
1. From the main screen select "menu" , enter and
select "density".The display will now be in units of
W/cm² or J/cm² depending if you were in the power
or energy measurement screen.
2. The default setteing is for round beams. If your beam
is round continue on to perform steps 3-5. If your
beam is rectangular perform steps 6-9.
3. Select "size" and you will see 4 default choices of
beam diameter.
4. Select the beam diameter you wish to adjust and
press the left navigation key.
5. Now modify by pressing the up/down navigation
keys to change each number and the right/left
navigation keys to move to the next number. After
you are finished, press "save" and enter.
6. Press "Rect" to switch to the rectangular mode.
7. Select "Height" and modify by pressing the up/down
navigation keys to change each number and the
right/left navigation keys to move to the next
number. After you are finished, press "save" and
enter.
8. Select "Width" and modify in the same way.
9. The beam size will appear in the box above the
"Height" box.
4.6.3. Power and Energy Limits Screens
The Vega gives you the option to set upper and lower
limits of power and energy. If these limits have been set
in the limit screen, then when the power or energy is
above the maximum limit, the message "OVER" will
appear on the screen and when under the minimum limit,
the message "UNDER" will appear on the screen. When
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