HAMAR LASER STEALTH Series, General Training Manual, Page: 25 / 113

21
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 that 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). Subtract the Set Point from Reading 1 and
divide the result by the D1 (distance between the points). The result is the calibration of the level vial
in units of in/ft or mm/m. To be within specifications, the calibration result should be as follows:
Split Prism Vial Assembly:
≤
.00006 in/ft (0.005 mm/m)
Standard Levels:
≤
.00018 in /ft (0.015 mm/m)
Example:
15 ft. (D1)
.000 (Near Reading)
.035 (Far Reading 1)
+ .010 (Far Reading 2)
.045 (Sum of the two readings)
+.045 / 2 = +.0225 (Set Point)
In/Out of Calibration Calculation = (Far Reading 1 - Set Point) / D1
(.035 - .0225) / 15 = .0008 in./ft. (out of spec)
If this value is out of the specification, then you will need to use the Set Point to bring it back into
specification. See Step 6 below.