Bosch GLL 3-50 Professional Original Instructions Manual page 18

18 | English
Doubled height of the door opening × 0.3 mm/m
Example: At a door opening height of 2 m, the maximum de-
viation amounts to
2 × 2 m × ±0.3 mm/m = ±1.2 mm. The points Ⅲ and Ⅳ
must therefore be no further than 1.2 mm from each other.
Checking Plumb Accuracy
For this check, you will need a clear measuring space on firm
ground with a distance of approx. 5 m between the floor and
the ceiling.
– Mount the measuring tool onto the rotating platform (16)
and place it on the floor. Select vertical mode with auto-
matic levelling and allow the measuring tool to level in.
5 m
– Mark the centre of the top point of intersection of the
laser lines on the ceiling (point Ⅰ). Also mark the centre of
the plumb point on the floor (point Ⅱ).
d
– Turn the measuring tool by 180°. Position it so that the
centre of the plumb point falls onto the marked point Ⅱ.
Allow the measuring tool to level in. Mark the centre of the
top point of intersection of the laser lines (point Ⅲ).
– The discrepancy d between the two marked points Ⅰ and
Ⅲ on the ceiling reveals the actual deviation of the meas-
uring tool from the vertical plane.
You can calculate the maximum permitted deviation as fol-
lows:
Doubled distance between floor and ceiling × 0.6 mm/m
Example: At a floor-to-ceiling distance of 5 m, the maximum
deviation amounts to
2 × 5 m × ±0.6 mm/m = ±6 mm. The points Ⅰ and Ⅲ must
therefore be no further than 6 mm from each other.
1 609 92A 4HM | (19.11.2018)
Practical Advice
u
Working with the Laser Target Plate
The laser target plate (19) improves visibility of the laser
beam in unfavourable conditions and at greater distances.
The reflective half of the laser target plate (19) improves vis-
ibility of the laser line. The transparent half enables the laser
line to be seen from behind the laser target plate.
Working with the measuring plate (accessory)
(see figures G–H)
The measuring plate (21) can be used to project the laser
mark onto the ground and/or the laser height onto a wall.
The offset to the desired height can be measured using the
zero field and the scale, and can be projected at another
point. This means that you do not need to precisely adjust
the measuring tool for the height you want to project.
The measuring plate (21) has a reflective coating that en-
hances the visibility of the laser beam at greater distances
and in intense sunlight. The brightness intensification can
only be seen if you view the measuring plate with your line of
sight parallel to the laser beam.
Working with the Tripod (Accessory)
A tripod offers a stable, height-adjustable support surface
for measuring. Place the measuring tool with the 1/4" tripod
mount (6) on the thread of the tripod (22) or a conventional
camera tripod. Use the 5/8" tripod mount (9) to secure the
measuring tool on a conventional building tripod. Tighten the
measuring tool using the locking screw of the tripod.
Roughly align the tripod before switching on the measuring
tool.
Working with the laser receiver (accessory)
180°
(see figure E)
Use the laser receiver (24) to improve detection of the laser
lines in adverse lighting conditions (bright environment, dir-
ect sunlight) and over greater distances. When working with
the laser receiver, switch on receiver mode (see "Receiver
Mode", page 15).
Laser Viewing Glasses (Accessory)
The laser viewing glasses filter out ambient light. This makes
the light of the laser appear brighter to the eye.
u
u
Example applications (see figures A–F)
Examples of possible applications for the measuring tool can
be found on the graphics pages.
Always place the measuring tool close to the surface or edge
that needs to be checked, and allow it to level in before the
beginning of any measurement.
Only the centre of the laser point or laser line must be
used for marking. The size of the laser point/the width of
the laser line changes depending on the distance.
Do not use the laser goggles as protective goggles.
The laser goggles make the laser beam easier to see; they
do not protect you against laser radiation.
Do not use the laser goggles as sunglasses or while
driving. The laser goggles do not provide full UV protec-
tion and impair your ability to see colours.
Bosch Power Tools