Bosch GLL 2-80 P Professional - Manual (Page 15)

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Bosch Power Tools 1 619 929 L96 | (29.11.12)
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 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 Line
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
a tripod) 2.5 m away from the door opening. Allow the
measuring tool to level in while in vertical operation with
automatic levelling, and direct the laser beam at the door
opening.
– 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).
– 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
line in such a manner that its centre runs exactly through
points
I and II.
– Mark the centre of the laser line at the upper edge of the
door opening as point IV.
– The difference d of both marked points III and IV results in
the actual deviation of the measuring tool to the plumb line.
– Measure the height of the door opening.
The maximum admissible deviation is calculated as follows:
Doubled height of the door opening x 0.2 mm/m
Example: For a door-opening height of 2 m, the maximum de-
viation may be
2 x 2 m x ±0.2 mm/m = ±0.8 mm. Consequently, points
III
and IV may be no more than 0.8 mm (max.) apart from each
other.
Working Advice
 Always use the centre of the laser line for marking. The
width of the laser line changes with the distance.
Working with the Laser Target Plate
The laser target plate 15 increases the visibility of the laser
beam under unfavourable conditions and at large distances.
The reflective part of the laser target plate 15 improves the vis-
ibility of the laser line. Thanks to the transparent part, the laser
line is also visible from the back side of the laser target plate.
Working with the Tripod (Accessory)
A tripod offers a stable, height-adjustable measuring support.
Position the measuring tool with the 1/4" tripod mount 9 onto
the thread of the tripod 22 or a commercially available cam-
era tripod. For fastening to a commercially available construc-
tion tripod, use the 5/8" tripod mount 8. Tighten the measur-
ing tool with the tripod mounting stud.
Fastening with the Universal Holder (Accessory)
(see figure D)
With the universal holder 19, you can fasten the measuring
tool, e.g., to vertical surfaces, pipes or magnetizable materi-
als. The universal holder is also suitable for use as a ground tri-
pod and makes the height adjustment of the measuring tool
easier.
Working with the Measuring Plate (Accessory)
(see figures A–B)
With the measuring plate 16, it is possible to project the laser
mark onto the floor or the laser height onto a wall.
With the zero field and the scale, the offset or drop to the re-
quired height can be measured and projected at another loca-
tion. This eliminates the necessity of precisely adjusting the
measuring tool to the height to be projected.
The measuring plate 16 has a reflective coating that enhances
the visibility of the laser beam at greater distances or in in-
tense sunlight. The brightness intensification can be seen on-
ly when viewing, parallel to the laser beam, onto the measur-
ing plate.
Working with the Laser Receiver (Accessory)
(see figure D)
Under unfavourable light conditions (bright environment, di-
rect sunlight) and for larger distances, use the laser receiver
for improved finding of the laser lines 17. When working with
the laser receiver, switch the pulse function on (see “Pulse
Function”, page 13).
2,5 m
2,5 m
2 m
d
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