Johnson 40-6515 Manuel D'instructions page 21

3515H-All_Manuals 6/2/10 10:16 AM Page 21
8. Self-Check and Calibration
IMPORTANT: It is the responsibility of the user to verify the
calibration of the instrument before each use.
X&Y-Direction Accuracy Self-Check
1. Note X & Y-direction as indicated on top of laser.
2. Place the laser on a platform that is 25' away from a wall
indoors. Position the laser so the X-direction is facing the
wall. Unlock the laser and set to low speed.
3. Mark on the wall where the beam hits the wall and mark that as A.
(Note: This test should be done indoors with dim lighting. It's
critical that the laser mark is easily seen.)
4. Turn the laser by 180 degrees, mark the beam as point B.
5. Measure the vertical distance between point A and point B. If A &
B are more than 1/16" apart at 25', the laser is out of calibration.
©2010 Johnson Level & Tool - Rev. 1
25'
25'
A
B
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