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13.

Repeat steps 4. - 12. above until the desired Position Output Scale Factor and Linearity are

obtained simultaneously. This is an iterative process and could take a few cycles through the

procedure.

14.

Again, it is recommended that the tuning procedure be followed to ensure the system's

closed loop response it still properly adjusted.

6.1.5.2. Open Loop Method

If the system has not been tuned or there is some doubt as to state ofthe tuning, use this method

to adjust the Position Output Scale Factor to a coarse level so the system can be tuned. After the

system is completely tuned, go back to section

7.1.5.1.

and perform the Closed Loop Method for

Position Output Scale Factor and Linearity Adjustment.

Follow steps

- 7 in section

4.2.

above. Connect TP4 to ground.

Tum on the power.

The system should perform its normal tum-on process as described in section 4.2. above

except that the scanner will not "stiffen up".

Note: If the scanner shaft position moves outside +/-20°, the system will go into a fault state.

During this test, this is not a harmful condition and can be ignored.

Adjust the Command Input Offset Adjustinent trimpot Rl to

0.000

volts as measured on the

wiper of

Rl.

Use TP2 or W7.2 as the ground reference.

Reflect a laser beam onto the mirror ofthe scanner being adjusted. This laser beam should be

parallel to the wall and level to the floor before it strikes the mirror on the scanner. Tum the

scanner's output shaft so that the Position Output signal, Vp, as measured on TPl reads as

close to

0.000

volts as possible. Simultaneously position the scanner body vertically so that

the beam is striking the wall perpendicularly. The scanned beam should be in the same plane

as the beam striking the mirror. This is important so that the optical beam deflection angle to

mechanical deflection angle relationship is a constant factor of

two.

Compound angles will

result in relationships that are not just a factor of

two.

Mark the point the laser strikes the

wall and label it

PI.

Measure the distance

from

the mirror to the wall and call this Ll.

6. Move the scanner shaft by hand so that the voltage at TPl is about +5 volts. Mark the

position on the wall and label it

P2.

Simultaneously measure the voltage at TPl and label it

VPl.

Move the scanner by hand so that the voltage at TPl is about

-5

volts. Mark the position on

the wall and label it

P3.

Measure the voltage at TPl and label it VP2.

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