Johnson Level & Tool Mfg. 40-6683 User Manual

Page 13

5. Move the tripod within .6m of target “A”. Make a mark where

the cross meets target “A” and label as “A2”.

6. Rotate the laser 180º and make a mark where the cross

meets target “B” and label as “B2”.

7. Calculate (A1-A2) - (B1-B2) = E. If the absolute value of E is

above 1mm, the laser accuracy is out of tolerance and
calibration is required.

Self-Check and Calibration

The instrument has two calibration apertures. Aperture “A” adjusts

the horizontal axis. Aperture “B” adjusts the vertical axis.

Notes regarding adjustment:

• Use a 3mm hexagon tool for adjustment.

• The adjustment of each axis may influence the other. When

making fine adjustments in the left/right direction horizontally,
the front and back direction vertically may change. When
adjusting the front/back direction vertically, the left and right
direction will possibly change. Adjustments may need to be
checked and repeated alternately.

• The adjustment of the self-calibration screw cannot exceed

four turns in either direction.

• If the laser accuracy cannot be adjusted through self-calibration,

please contact an authorized repair facility, or contact Johnson
Level & Tool.

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