Johnson 40-6502 - Calibration and Specifications; Self-Check and Calibration; X and Y Vial Calibration Procedure

16 ©2010 Johnson Level & Tool - Rev. 1
8. Self-Check & Fine Calibration
IMPORTANT: It is the responsibility of the user to verify the
calibration of the instrument before each use.
X and Y-direction Vial Self-Check and Calibration
1. As shown in the figure above, place the laser at position L 50’
away from the wall (start with the X-vial facing the wall).
2. Level the X and Y vials, turn on the laser, adjust the speed so
the beam can be seen on the wall.
3. Mark the point where the laser beam hits the wall as X+.
4. Turn off the laser and turn it 180º, repeat step 3 and mark the
point where the laser beam hits the wall as X-.
5. Measure the distance between X+ and X-. If it is more than
1/8” apart, the X-vial needs calibrating.
6. Repeat this same procedure for the Y vial.
Calibration Method
Mark the middle point as O between X+ and X- on the wall.
Using the X vial leveling knob, adjust the beam to the O point.
L (50’)
X
+
X
-
0
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