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6.1.8. Aligning the Mirror

This procedure describes how to align the scanner mirror (load) while the servo is still active.

Since the servo normally interprets someone holding or touching the mirror as a change in the

inertia ofthe mirror, the system usually goes unstable. The Mirror Alignment

Mode

jumper, W5,

when activated, lowers the loop gain, allowing the user to loosen the mirrors while the servo is

still active, but without it going unstable.

Note: This procedure can only be used to align the mirror to the center of

its

range. It cannot be

used to align the mirrors to some other point in the field. The Mirror Alignment Mode jumper

forces the scanner to go to the centered position.

Setup the system by following steps 1 - 7 in section 4.2. above. The system must have had

the Position Output Scale Factor, the Command Input Scale Factor, and the Closed Loop

Response already adjusted properly either by

CTI,

or by the above procedures.

Send a digital 32768io to both chaimels for digital inputs, or send a

0.000

volt signal for

analog inputs. Ensure the Command Input Offset trimpot Rl is set to

0.000

volts by

monitoring on the wiper of

R1.

Remove the jumper, W5, from connecting pins 2 and 3, and re-insert it onto pins 1 and 2.

The system is now set up in Mirror Alignment Mode.

Tum the power on. The system should tum on in the normal sequence, except the mirrors

will stay at the center position.

The mirtor mount clamp screws can now be loosened.

6. Referring to the proper XY Mount Interface Dwg in section 6.2. locate the entiance and exit

points for

the

mount.

Align a laser beam so that it enters the entrance pupil perpendicularly to that side of the

mount. Make sure it is perpendicular in both the vertical and horizontal axes.

8. Place a target some distance from the mount to capture the exiting beam. Position the target

so that a beam exiting the XY mount is at the exit pupil and perpendicular to the entering

beam.

9. Adjust the mirrors in the XY mount so that the exiting beam strikes the center ofthe target.

10.

Make sure the mirrors are pushed all the way down the shaft. Tighten the screws securely,

but not so

tight

as to strip out the small Allen heads.

11.

Re-install W5 back to its Normal Mode location, connecting pins 2 and 3. Ensure the

position ofthe beam is still centered.

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