Bosch GLL 3-80 P Professional Original Instructions Manual page 8

OBJ_DOKU-32907-002.fm Page 15 Monday, May 12, 2014 12:52 PM
A
5 m
– Direct the laser against the close wall A and allow the meas-
uring tool to level in. Mark the centre of the point where the
laser lines cross each other at wall A (point I).
A
180°
– 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).
– Without turning the measuring tool, position it close to wall
B. Switch the measuring tool on and allow it to level in.
A
– 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.
A
d d
– Without changing the height, turn around the measuring
tool by 180°. Direct it against the wall A in such a manner
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that the vertical laser line runs through the already marked
point I. Allow the measuring tool to level in and mark the
B
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 deviation of the measuring tool
alongside the lateral 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 ex-
ceed 2 mm (max.).
Checking the Levelling Accuracy of the Vertical Lines
For this check, a door opening is required with at least 2.5 m
of space (on a firm surface) to each side of the door.
– Position the measuring tool on a firm, level surface (not on
B
a tripod) 2.5 m away from the door opening. Switch on the
measuring tool to operation with automatic levelling. Se-
lect an operating mode in which a vertical laser plane is
generated in front of the measuring tool.
B
– Mark the centre of the vertical laser line at the floor of the
door opening (point I), at a distance of 5 m beyond the
other side of the door opening (point II) and at the upper
edge of the door opening (point III).
B
180°
– Rotate the measuring tool by 180° and position it on the
other side of the door opening directly behind point II. Al-
low the measuring tool to level in and align the vertical laser
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