Axis 670 Manual de instrucciones descargar pdf (Pagina 29)

Tum on the power.

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

4.2.

above.

Adjust the Command Input Offset Adjustment trimpot, Rl to

0.000

volts as measured on

R1.2 (wiper). Use TP2 or W7.2 as the ground reference. Center the scanner by inputting a

signal into the Command Input so that Position Output voltage reads

0.000

volts as measured

at TPl.

Reflect a laser beam onto the mirror of the 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.

Position the scanner body vertically and 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 result in relationships that are not

just a factor of

two.

Mark tiiis location on the wall and label it PI. Measure the length from

the mirror to the wall and call this distance Ll.

6. Input a sine wave signal that drives the scanner to half of the full peak-to-peak angular

swing. Usually an input amplitude of

3.535

volts rms is appropriate. See section 3.6 above

for more information on the input scale factor calculation. Use an input

frequency

of-30 Hz

for most applications. For systems with low system bandwidth, because of

very

large loads,

drop the

frequency

to ~5Hz. Ensure the input sine wave signal has no DC component, i.e.

that the peak positive and negative excursions are equal.

Measure the rms voltage on TPl. Call this voltage VPl.

8. Label the endpoints ofthe scanned line on the wall as P2 and

P3.

Measure the distance from

P2to P3. Call

tiiis

distance L2.

9. The Position Output Scale Factor, POSF, is obtained with the following formula:

POSF = (VPl^

1.414)

/ ((arctangent(L2 / Ll / 2)) / 2) volts/° mechanical

10.

Use

R13

to set the POSF to

0.500

vohs/° mechanical. Setting it to anything else can damage

the scanner.

11.

Ensure that the

ACJC

voltage on TP7 never exceeds

+11V.

If it does, the AGC amplifier may

saturate as the scanner ages or temperatures change. The scanner would still operate, but at a

profound decrease in positioning stability. If the desired position signal gain cannot be

obtained without exceeding +1IV, seek technical assistance from Cambridge Technology.

12.

Monitor the ACJC signal at TP7 on an oscilloscope. AC couple the scope. Set the sensitivity

to lOmV/div. Adjust the Linearity Adjustment trimpot R77 to minimize the peak-to-peak

excursions of this signal.

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Axis 670 Manual de instrucciones Pagina 29

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