Bosch GLL 2-80 P Professional Manual Original página 21

OBJ_BUCH-907-001.book Page 20 Tuesday, June 30, 2009 2:32 PM
20 | English
Checking the Horizontal Levelling Accuracy of
the Lateral Axis
For this check, a free measuring distance of
5 metres on a firm surface between two walls A
and B is required.
– Mount the measuring tool onto a tripod or
place it on a firm and level survace close to
wall A. Switch on the measuring tool. Select
cross-line operation with automatic levelling.
✺ ✁
– Direct the laser against the close wall A and
allow the measuring tool to level in. Mark the
centre of the point where the laser lines
cross each other on the wall (point I).
✶ ✂ ✄ ☎
– Turn the measuring tool by 180°, allow it to
level in and mark the cross point of the laser
lines on the opposite wall B (point II).
1 609 929 S04 | (30.6.09)
– Without turning the measuring tool, position
it close to wall B. Switch the measuring tool
on and allow it to level in.
❇
– Align the height of the measuring tool (using
a tripod or by underlaying, if required) in
such a manner that the cross point of the
laser lines is projected against the previously
marked point II on the wall B.
❞
❇
– Without changing the height, turn around the
measuring tool by 180°. Direct it against the
wall A in such a manner that the vertical laser
line runs through the already marked point I.
Allow the measuring tool to level in and mark
the cross point of the laser lines on the wall
A (point III).
– The difference d of both marked points I and
III on wall A results in the actual height devi-
ation of the measuring tool alongside the lat-
eral axis.
On the measuring distance of 2 x 5 m = 10 m,
the maximum allowable deviation is:
10 m x 0.2 mm/m = 2 mm.
Thus, the difference d between points I and III
must not exceed 2 mm (max.).
❇
❇
✆ ✝ ✞ ✟
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