Johnson Level & Tool Mfg. 40-6080 - Manual (Page 11)

©2012 Johnson Level & Tool - Rev. 2 11
8. Self-Check and Fine Calibration
Checking the Horizontal Calibration
Select a flat and horizontal platform as a reference
surface, like a table-surface.
1. Place the laser digital level on this reference
surface, as shown in figure 1, and then record
the measured angle reading. Record this as A1.
2. Turn the laser digital level 180 degrees, as
shown in figure 2, and then record the
measured angle reading. Record this as A2.
3. If A1-A2 is greater than 0.2º, it is necessary to
calibrate the horizontal accuracy.
Checking the Vertical Calibration
Select a flat and vertical platform as a reference
surface.
1. Place the laser digital level on this reference
surface, as shown in figure 3, and then
record the measured angle reading. Record
this as A1.
2. Turn the laser digital level 180 degrees, as
shown in figure 4, and then record the
measured angle reading. Record this as A2.
3. If A1-A2 is greater than 0.2º, it is necessary
to calibrate the vertical accuracy.
IMPORTANT: It is the responsibility of the user to verify the
calibration of the instrument before each use.
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