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Checking the Horizontal Levelling
Accuracy of the Lateral Axis
A free measuring distance of 65-ft 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 65-ft to the wall.
Switch the measuring tool on and select
5-point operation.
– 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 65-ft = 130-ft,
the maximum allowable deviation is:
130-ft x ±0.3 mm/m = ±1/2"
Thus, the difference d between points I and II
may not exceed 1/2" (max.).
Checking the Horizontal Levelling
Accuracy of the Longitudinal Axis
A free measuring distance of 65-ft on a firm
surface between two walls A and B is required
for the check.
– Mount the measuring tool onto the holder or
a tripod, or place it on a firm and level surface
close to wall A. Switch the measuring tool on
and select 5-point operation.
– Direct the horizontal laser beam, which
runs parallel to the longitudinal axis of the
measuring tool, at the close wall A. Allow the
measuring tool to level in. Mark the centre of
the laser beam on the wall (point I).
– Turn the measuring tool around by 180°, allow
it to level in and mark the centre point of the
laser beam on the opposite wall B (point II).
– Without turning the measuring tool, position
it close to wall B. Switch the measuring tool
on and allow it to level in.
65 ft
A
B
65 ft
180°
B
A
A
B
d
180°
GCL 25 Manual with translations.indd 10 4/24/12 8:29 AM