Bosch Professional GLL 3-80 CG - Checking the Levelling Accuracy of the Vertical Lines; Vertical Accuracy Measurement

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A
B
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
B
– 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
B
d
180°
– 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×±0.2mm/m=±2mm. The discrepancy d between
pointsⅠ and Ⅱ must therefore amount to no more than 2mm.
Checking the Levelling Accuracy of the Vertical Lines
For this check, you will need a door opening (on solid
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 in the mode with automatic levelling. Se-
lect the operating mode for generating a vertical laser
plane directly in front of the measuring tool.
2,5 m
2,5 m
– 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).
2 m
d
– 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.
Repeat the measuring process for the two vertical laser
planes. To do this, select the operating mode for generating
Bosch Power Tools 1 609 92A 5DN | (26.03.2020)