Johnson Level & Tool Mfg. 40-6517 - Manual (Page 23)

©2010 Johnson Level & Tool - Rev. 1 23
Accuracy Self-Check for Vertical Output Status
1. Follow the prior operations, and measure the distance H1
between the laser rotating plane and the platform surface.
2. Set the locking knob to locking position, and place the instrument
horizontally.
3. Adjust the adjusting screw to center the bubble.
4. Measure the distance H2 between the top laser beam and the
platform surface.
5. Mark out E in the position that is (H1 –H2 ) lower than point 0.
6. If e – point 0 < 0.394" (10mm), the accuracy is within tolerance.
Vertical Bubble Calibration
1. Use a screwdriver to screw out the bubble-adjustment-hole bolt.
2. Insert the Allen wrench into the adjustment hole to adjust the
Allen screw.
3. Rotate the Allen wrench to center the bubble.
4. After adjustment operation, please install the bubble-adjustment-
hole bolt back to its original position.
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