CST/BERGER MP3 Manual Original página 23

Checking the Horizontal Levelling Accuracy of the Lateral Axis (XP5)
A free measuring distance of 20 m on a firm surface in front of a wall is required
for the check.
– Mount the measuring tool onto the holder or a tripod, or place it on a firm
and level surface at a distance of 20 m to the wall. Switch the measuring
tool on.
– Direct one of the two lateral laser beams, that run alongside the lateral axis
of the measuring tool, at the wall. Allow the measuring tool to level in. Mark
the centre of the laser beam on the wall (point I).
– Rotate the measuring tool by approx. 180° without changing its height.
Allow it to level in and mark the centre point of the other lateral laser beam
on the wall (point II). Take care that point II is as vertical as possible above
or below point I.
– The difference d of both marked points I and II on the wall results in the
actual height deviation of the measuring tool alongside the lateral axis.
On the measuring distance of 2 x 20 m = 40 m, the maximum allowable devia-
tion is:
40 m x ± 0.2 mm/m = ± 8 mm.
Thus, the difference d between points I and II may not exceed 8 mm (max.).
2 610 A15 119 • 22.10.09
2 0
d
m
180˚
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