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PASS
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physically oriented as shown on Page 20). Also, set Switch 4 to “Light sensor not used” (switch moved to
the left.) These switch positions are necessary for the next few adjustments.
Next, output a slow-moving circle (for example, somewhere in the 1Hz to 5Hz range) using a function
generator or abstract generator feature of the software. The circle should be somewhere between 50%
and 100% size for this test. Note that while doing this and if PASS is not set correctly, the laser beam will
probably be allowed to enter the audience area. Therefore it is once again important to make sure there
are no untrained or non-technical personnel present in the room during this setup.
At this point and with this kind of pattern being projected, you should see that – while the beam is above
the audience area, it is visible, and while the beam is within the audience area, it is extinguished. If you
do not see this, then it is possible that the Horizon potentiometer is set so far in one direction, that PASS
thinks the entire scan field is above the horizon. In such a case, turn the Horizon potentiometer several
turns clockwise, and then several turns counterclockwise, until you see that there is an area where the
beam is blanked. If you never reach a point where the beam is not extinguished, then stop right there
and make sure PASS is wired correctly – particularly with respect to the scanner position signals.
Next, adjust the Horizon potentiometer clockwise, and counter- clockwise, to position the area (horizon)
such that the beam is extinguished when it is in the audience area.
Once this is done with the slow-moving circle, COLLAPSE the Y axis (change Y size to zero in the
software), which will project essentially a slow-moving horizontal beam – centered on the Y-axis. You will
want to make sure that the beam is extinguished in this configuration, because it is important when the
projector has no scanning input (i.e. X and Y projector inputs at zero) that no light will come out of the
projector.
Now adjust the Y position control in the software upward, to the point where the beam becomes visible
again. You want this to be at least 2% upward. If the beam becomes visible at 1% upward position on Y,
adjust the Horizon control again to extinguish the beam.
Once the Horizon is verified above, return the Y position control in the software to 0.
Step 2: Determine the Maximum Beam Power allowable in the audience area
Now that the PASS horizon has been adjusted, it can be used to aid in preparing to evaluate the
maximum laser power that will be allowed in the audience.
At this point it will be necessary to configure the software to output a stationary, non-modulated laser
beam. In LD2000 this can be done by going to the Abstract Generator (menu SFX/Abstract Generator),
and then reducing the size of the default abstract to zero, and then pressing OK.
If you have adjusted the horizon properly, you should see NOTHING coming out of the laser projector.
Otherwise, go back and repeat the steps above, ensuring that the Horizon potentiometer is adjusted
properly.
Since the point is to determine the maximum amount of laser power that will be safe in the audience,
this should be done with any projector-based power-level adjustments defeated. For example, if the
projector has potentiometers (or digital adjustments) accessible from the rear, that can be used to