CAL & ADJUST
3-6
VersaPulse Select Service Manual
0621-499-01 03/94
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The system software has a 2.2 volts/Joule conversion factor written into it, so the energy monitor
circuit must be calibrated to output 2.2 volts for a 1 Joule pulse. With 40 Hz selected, but only one
rod on, the actual pulse rate will be 40/4 = 10 Hz. Since 1 Watt= 1 Joule/sec, 10 Watts = 10 Joules/
second,i.e. each pulse is 1 Joule.
5.) Calibrate ENERGY II.
Attach the scope probe to TP3.
Fire the laser, adjusting CPU PCB R8 to adjust the amplitude of the positive pulses on the oscilloscope
screen to approximately 2.22 volts (the pulse will be about 2 mseconds in width, with a relatively
"square" profile). Once the pulses are of the correct amplitude, release the footswitch.
6.) Calibrate ENERGY I
Move the probe to TP2, then adjust as in step 5 above, using CPU PCB R7.
7.) Calibrate ENERGY III
Move the probe to TP4, then adjust as in step 5 above, using CPU PCB R9.
8.) Turn all the rods back on, then confirm the calibration.
Turn the system back on (CPU PCB SW3 in its up position so the system will go through its
autocalibration), then fire the laser into the power meter across its range of operating points,
confirming that delivered power as measured by the power meter is always within ±10% of selected
power.
3.4 YAG CHANNEL ADJUSTMENTS
When properly adjusted the YAG channel will meet each of the following three criteria.
•␣The cavity HR will be positioned to direct the YAG output to the center of the first relay mirror, and
the cavity OC will be positioned to provide maximum power for that HR position.
• The first relay mirror and second (plano) relay mirror will direct the YAG energy off the two
folding mirrors so that it is centered through the wedge optic apertures and centered into the
proximal end of the fiber.
• Each YAG beam will be coaxial with the other YAG channels, confirmed at the second wedge optic
aperture and at the fiber port.
The adjustment procedure for a single channel follows. The procedure is a complete check out and alignment for
a single channel. The procedure is meant to be done in the order given, from beginning to end.
12/95
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