Checking and Adjusting Calibration
5. Return to the laser and rotate it 180 degrees. Allow the laser to re-level.
The opposite cross axis (X) direction is now aimed at the target. Find and
mark the laser beam height (see step 4).
6. The difference between the two marks (if any) is double the difference
between how the laser is calibrated and true level for the cross axis. Half
way between these two marks is true level. Make a long mark at true level.
If the difference between either outer mark and true level is within your
working tolerance, go on to step 10. If not, continue with the next step.
7. Remove the battery door and the rubber plug on the lower left side of the
battery holder. The four button switches inside control the calibration of the
laser. Each push of a button moves the calibration by approximately 3 arc
seconds (approx. 1/64” @100’ / .4mm @30m). A small screwdriver, allen
wrench or even a dull pencil can be used to press the buttons. The label
below the opening shows which direction each button will move each axis.
Press the + or - button corresponding to the X axis the number of times
estimated to bring the beam to the true level mark. Go to the target surface
and check the beam elevation. If the elevation is correct, go on to step 8. If
not, continue to press the button until the beam comes to level.
8. Check the cross axis adjustment by rotating the laser back to the first
direction and letting the laser re-level. Check that the reading is within the
needed tolerance of the true level mark.
9. Rotate the laser 90 degrees to aim the front of the slope axis at the target
(+Y axis). Allow the laser to re-level and check the reading at the target. If
the reading is on, or within tolerance of the true level mark, calibration is
complete. If not, continue on.
10. Verify the counter is set to exactly 00.00. Remove the battery door and
the rubber plug on the lower left side of the battery holder. The four button
switches inside control the calibration of the laser. Each push of a button
moves the calibration by approximately 3 arc seconds (approx. 1/64” @100’ /
.4mm @30m). A small screwdriver, allen wrench or even a dull pencil can be
used to press the buttons. The label below the opening shows which
direction each button will move each axis. Press the + or - button
corresponding to the Y axis the number of times estimated to bring the beam
to the true level mark. Go to the target surface and check the beam
elevation. If the elevation is correct, put the rubber plug back in. If not,
continue to press the button until the beam comes to level.
Calibration is now complete.
13
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