Johnson 40-6557 Mode D'emploi page 25

8489H-All_Manuals 11/18/14 11:50 AM Page 25
8. Self-Check & Fine Calibration
IMPORTANT: It is the responsibility of the user to verify the
calibration of the instrument before each use.
It is recommended that the laser must be self-checked before
operation. If the accuracy is found beyond tolerance, the user can
make fine adjustments according to the 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 10' away from one
wall and 50' away from another wall indoors, with the X direction
facing the wall head-on. Turn the unit on.
3. Mark on the wall where the beam hits the short shot (10') and mark
it X= and the long shot (50') and mark it X-.
4. Turn the instrument 180° being careful not to change the HI (height
of the instrument). Mark on the wall short shot X- and long shot X=.
5. Measure the vertical distance between X= and X- at the long
shot. If X= and X- are more than 1/16" apart at 50', the unit is
out of calibration. Note: If there is a vertical difference at the
short shot, the HI was changed when the laser was rotated 180°.
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 Y- and point Y= by turns.
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