
6
5. Adjust the elevation of the Optical Auto Level so the horizontal cross-hair is lined up exactly on
the center of the red dot at the laser unit.
DANGER: NEVER LOOK THROUGH AN OPTICAL LEVEL DIRECTLY AT A LASER
SOURCE. SERIOUS EYE INJURY COULD RESULT.
6. Remove the paper from the laser unit’s rotary head so the beam can project a red dot on the far
wall.
7. Rotate the Optical Level around to view the dot on the graph paper mounted on the far wall.
8. Measure how far the center of the red dot is above or below the cross-hair. This is the amount of
calibration error of the laser unit’s Z axis.
9. Table of acceptable calibration error
Z-AXIS ALLOWABLE ERROR
(Equivalent to 20 arcseconds or 1/8” at 100 ft.)
Distance to Target 40 ft. (12m) 50 ft. (15m) 70 ft. (21m) 100 ft. (30m)
Allowable Error +/- 1mm +/- 1.5mm +/- 2mm +/- 3mm
If the error is greater than these acceptance limits, then the laser unit must be recalibrated
I. RECALIBRATING THE Z-AXIS:
1. Put the laser unit into the “Z” calibration mode by pushing and holding the “SCAN” button on the
laser keypad. While still pushing the “SCAN” button, push and release the “ON” button on the
laser keypad. Release the “SCAN” button.
2. The laser unit will automatically move through its range of Z movement, then come to rest.
3. Use the REMOTE CONTROL “UP” and “DOWN” arrow buttons to move the laser beam until the
dot on the far wall lines up with the horizontal cross-hair of the Optical Level.
IMPORTANT NOTE: IF THE BEAM GETS TO THE END OF ITS ADJUSTMENT RANGE
BEFORE CALIBRATION REQUIREMENTS ARE MET, THEN THE UNIT CAN NOT BE
RECALIBRATED. THE COMPENSATOR WILL NEED TO BE REPLACED.
4. Allow the laser unit to stabilize for about 30 seconds.
5. Using the LASER UNIT KEYPAD (not the remote control), press and hold the “Scan” button. A
continuous tone will be heard. While holding the “Scan” button, press and release the “Down”
arrow button. This step stores the calibration settings into the laser unit’s memory, and the
continuous tone will stop.
6. Shut the laser unit off, then repeat the “Z”-Axis Calibration Check (Section H, steps 1-9) to
confirm that the calibration is now correct.
A piece of paper on
the laser head allows
the beam to be sighted
with the optical level
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