Johnson Level & Tool Mfg. 40-6522 - Manual (Page 18)

18 ©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.
The instrument must be self-checked before operation. If the
accuracy is found beyond tolerance, user can make adjustment
according to directions as follows.
X & Y-Direction Accuracy Self-Check
1. Note the X & Y-direction on top of the laser.
2. Place the unit on a platform or tripod that is 50’ away from a
wall indoors, with the X-direction facing the wall head-on. Turn
the unit on.
3. Using the detector mark on the wall where the beam hits the wall
and mark that as A.
4. Turn the instrument by 180 degrees and mark the beam as point B.
5. Measure the vertical distance between point A and point B. If A &
B are more than 1/32” apart at 50’, the unit is out of calibration.
6. Turn the instrument by 90° and place it on the platform, with
the Y-direction facing the wall. Perform Y-direction self-check
with the same method as X-direction self-check, and mark
point C and point D by turns.
50’
3327H_Manuals 4/23/10 1:09 PM Page 18