Bosch GLL 2-20 G Professional Manual Original página 9

A
180°
– Turn the measuring tool 180°, allow it to level in and mark
the point where the laser lines cross on the opposite wall
B (point Ⅱ).
– Position the measuring tool – without rotating it – close to
wall B, switch it on and allow it to level in.
A
– Align the height of the measuring tool (using the tripod or
by placing objects underneath as required) so that the
point where the laser lines cross exactly hits the previ-
ously marked point Ⅱ on wall B.
A
d
– Turn the measuring tool 180° without adjusting the
height. Aim it at wall A such that the vertical laser line runs
through the already marked point Ⅰ. Allow the measuring
tool to level in and mark the point where the laser lines
cross on wall A (point Ⅲ).
– The discrepancy d between the two marked points Ⅰ and
Ⅲ on wall A reveals the actual height deviation of the
measuring tool.
The maximum permitted deviation on the measuring dis-
tance of 2 × 5 m = 10 m is as follows:
10 m × ±0.4 mm/m = ±4 mm. The discrepancy d between
points Ⅰ and Ⅲ must therefore amount to no more than
4 mm.
Bosch Power Tools
Checking the Level Accuracy of the Vertical Line
For this check, you will need a door opening (on solid
B
ground) which has at least 2.5 m of space either side of the
door.
– Place the measuring tool 2.5 m away from the door open-
ing on a firm, flat surface (not on a tripod). Switch on the
measuring tool and select vertical operation. Aim the
laser line at the door opening and allow the measuring
tool to level in.
B
– Mark the centre of the vertical laser line on the floor of the
door opening (point Ⅰ), 5 m away on the other side of the
door opening (point Ⅱ) and on the upper edge of the door
opening (point Ⅲ).
B
180°
– Rotate the measuring tool 180° and position it on the
other side of the door opening, directly behind point Ⅱ.
Allow the measuring tool to level in and align the vertical
laser line in such a way that its centre passes through
points Ⅰ and Ⅱ exactly.
– Mark the centre of the laser line on the upper edge of the
door opening as point Ⅳ.
– The discrepancy d between the two marked points Ⅲ and
Ⅳ reveals the actual vertical deviation of the measuring
tool.
– Measure the height of the door opening.
You can calculate the maximum permitted deviation as fol-
lows:
English | 9
1 609 92A 607 | (14.01.2021)