OPS-A
Arc Lamp Power Supplies
Page 20
5.2 CURRENT OPERATION MODE
In current mode, the lamp is operated at a constant current setting. As the voltage cannot be changed,
the power is raised or lowered to maintain the current at the same level. As the lamp ages, the power is
increased. This results in greater optical output which to some extent may help compensate for a
darkening lamp envelope. However, the lamp life is reduced due to the increase in power.
1. Press the horizontal menu button under the Lamp Mode icon on the LCD display until the text under
Lamp Mode reads Current as shown in the figure above.
2. Upon reaching the Constant Power mode option, the vertical menu for setting the lamp operating
current (Iset) and maximum current to be supplied to the lamp (Imax) will appear as shown on the next
page.
3. To adjust the Iset and Imax, press the vertical menu button next to each parameter. A red bullet in the
box indicating that particular parameter can be changed will appear. That parameter can now be
changed by rotating the knob to the right of the vertical menu buttons. Be aware that Imax can only be
changed when the lamp is not ignited.