Section 4 - Alignment & Calibration
4-9
Note:
The last direction turned should be clockwise to eliminate backlash when the jam nuts are
tightened.
2.
Move the
back
Filter Drum Allen alignment screw until the X-ray signal peaks.
Note:
The last direction turned should be clockwise to eliminate backlash when the jam nuts are
tightened.
3.
Tighten the jam nuts on both Filter Drum Allen alignment screws. (The X-rays should
still show peak amplitude.)
The next 7 steps adjust the beam front to back.
1.
Turn off X-rays and remove the alignment test fixture.
2.
At the Array assembly, loosen the four X-alignment nuts (see Figure 4-7).
3.
Turn on X-rays.
4.
Adjust the array X-alignment screw in one direction until the trace drops off (the signal
on the end detectors of the array will drop off). Then, count the turns while moving it in
the other direction until the trace falls off on the detector on the other end of the array.
Set the adjustment in the middle by turning the screw back half the number of turns
counted.
5.
Tighten the four array X-alignment nuts.
6.
Turn off X-rays.
7.
Turn off SUSQ.
APERTURE CALIBRATION (A and SL only)
This procedure identifies the exact positions of each aperture (slit) in the encoder unit.
1.
Center and lower the table.
2.
Run SQDRIVER, press <Enter>.
3.
At the CARM$$$$> prompt type CALIBRATE (be patient, this procedure takes several
minutes).
MOTOR CALIBRATION
The SQDRIVER program provides a CALIBRATE command for each of the motors (TZ, AY,
TY, TX and AR) to calibrate the encoder read back and determine the limits of motion.
Use the following table to determine which calibration procedures you need to perform on a
given QDR 4500 model.
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