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©2012 Johnson Level & Tool
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 for
accuracy periodically,
specifically before a
large project, where
accuracy is critical.
If the accuracy is found to be beyond tolerance, some adjustment
may be made as follows.
X-Axis and Y-Axis Accuracy Check:
1. Place a table indoors, approximately 20m from a wall. Place the
instrument on the table with the X-axis facing the wall.
2. Power the instrument on and allow it to self-level. Adjust the
rotating speed to make the output laser line clear and visible.
Mark a vertical line on the wall that intersects the laser line from
the instrument. Mark a line where the laser line hits the vertical
line, and label as ‘A’.
(Turning in a clockwise direction):
A = X+
B = Y+
C = X-
D = Y-
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