12
Setting the First Level Vial – Roll Axis
6.
Tilt the laser to the Set Point
Move the target back to the Near Point to verify it still reads zero. If not, re-zero it. Then move the
target back to the Far Point and tilt the laser by adjusting the Roll Axis adjustment knob on the laser
base until the readout displays the calculated Set Point.
7.
Adjust the level.
Locate the two recessed adjustment
screws for the Roll Axis level you are
adjusting (see Figure 8). Using the
wrench provided, adjust the level
assembly until the bubble is centered in
the window for the Standard Level Vials
or the two halves of the bubbles line up
for the Split Prism Level Vial (see Figure
4 and Figure 5). For example, to move
the bubble to the left, loosen the left
screw and tighten the right screw. When
the bubble is centered, tighten the left
screw until the bubble is stationary.
Check your work by repeating these
steps and ensuring that the level is
calibrated to within the specified
tolerances.
Note:
Tighten the set screws just firmly
enough to hold the window assembly in place.
Over-tightening these screws may cause
damage.
Calculating the Calibration of the Levels Vials – Pitch Axis
1.
Level the laser.
Rotate the entire laser unit 90° to calibrate the Pitch Axis level vial. Using the adjustment knobs, level
the laser so that
both
the pitch and roll levels are exactly level.
2.
Zero the target in the Near Position.
Set the target on the same Near Position as before and re-zero it.
3.
Determine Far Reading 1.
Move the target to the same Far Position as before and repeat Step 3 (Roll Axis) above.
4.
Determine Far Reading 2.
Rotate the entire laser unit 180°. Re-level the laser using the adjustment knobs so
both
the pitch and
roll levels are exactly level. Return the target to the Near Position, ensuring that it is placed in the
exact position as before. Re-zero the target on this point. Move the target back to the Far Position,
again ensuring that it is positioned exactly as before. Record the target reading. This is
Far Reading
2
.
5.
Calculate Level Calibration and the Set Point – Pitch Axis
Add Reading 1 and Reading 2 and divide by 2 (Set Point). Divide this Set Point by the D1 (distance
between points). The result is the calibration of the level vial in units of in/ft or mm/m. To be in
specification, the calibration result should be as follows:
Figure 8 –
L-733 (top view) showing location of Precision Level Vials and
corresponding adjustment screws
