HAMAR LASER STEALTH Series, General Training Manual

Page: 23 / 113

19
5. Calculate the Set Point – Roll Axis
Set Point = (Reading 1 + Reading 2) / 2 . 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)
.020 (Far Reading 1)
+ -.010 (Far Reading 2)
+.010 (Sum of the two readings)
Set Point: +.010 / 2 = +.005
In/Out of Calibration Calculation = (Far Reading 1 - Set Point) / D1
(.020-.005) / 15 = .001 in/ft - this is out of spec!
If this value is out of the specification, then you will need to use the Set Point to bring the level vial
window back into specification. See Step 6.