Working Advice; Example Applications; Laser Beam - Bosch GRL 400 H Professional Originalbetriebsanleitung

d
– Rotate the measuring tool 180° without changing its posi-
tion. Allow it to level in and mark the centre point of the
laser beam on the wall (point Ⅱ). Note that point Ⅱ should
preferably be positioned vertically above or below point Ⅰ.
The discrepancy d between the two marked points Ⅰ and Ⅱ
on the wall reveals the actual height deviation of the measur-
ing tool for the axis being measured.
Repeat the measuring process for the other axis. To do this,
turn the measuring tool by 90° before beginning the meas-
urement.
The maximum permitted deviation on the 30 m measuring
distance is as follows:
30 m × ±0.08 mm/m = ±2.4 mm. The discrepancy d
between points Ⅰ and Ⅱ must therefore amount to no more
than 4.8 mm for each of the two measuring processes.

Working Advice

Only the centre of the laser line must be used for
u
marking. The width of the laser line changes depending
on the distance.
Working with the Laser Target Plate
The laser target plate (17) improves visibility of the laser
beam in unfavourable conditions and at greater distances.
The reflective surface of the laser target plate (17) improves
visibility of the laser line. The transparent surface enables
the laser line to be seen from behind the laser target plate.
Working with the Tripod (Accessory)
A tripod offers a stable, height-adjustable support surface
for measuring. Place the measuring tool with the 5/8" tripod
mount (9) on the thread of the tripod (14). Tighten the
measuring tool using the locking screw of the tripod.
On a tripod featuring a measuring scale on its extender, you
can set the height deviation straight away.
Roughly align the tripod before switching on the measuring
tool.
Overview of the rotary laser indicators
Switching on the measuring tool (1 s self-
check)
Bosch Power Tools
Working with the Laser Receiver (accessory)
Use the laser receiver (12) to improve detection of the laser
180°
lines in adverse lighting conditions (bright environment, dir-
ect sunlight) and over greater distances.
For rotary lasers with multiple operating modes, select the
horizontal or vertical operation with the highest rotational
speed.
Before working with the laser receiver, read and observe the
laser receiver operating instructions.
Working with the measuring rod (accessory)
(see figure A)
To check levels or apply slopes, it is recommended to use
the measuring rod (13) together with the laser receiver.
A relative measuring scale is incorporated at the top of the
measuring rod (13). You can preselect its zero at the bottom
on the extender. This enables you to read deviations from
the target height straight away.
Laser Goggles (Accessory)
The laser goggles filter out ambient light. This makes the
light of the laser appear brighter to the eye.
Do not use the laser goggles (accessory) as protective
u
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 (accessory) as
u
sunglasses or while driving. The laser goggles do not
provide full UV protection and impair your ability to see
colours.

Example applications

Checking depths of foundation pits (see figure A)
Place the measuring tool on a stable surface or mount it on a
tripod (14).
Working with a tripod: Set the laser beam at the required
height. Apply or check the height at the target location.
Working without the tripod: Establish the height difference
between the laser beam and the height at the reference
point. Apply or check the height difference measured at the
target location.
When measuring on large distances, you should always set
the measuring tool in the centre of the work area and on a tri-
pod in order to minimise interference.
When working on unstable ground, mount the measuring
tool on the tripod (14). Take care that the shock-warning
function is activated, in order to avoid faulty measurements
in case of ground vibrations or shock to the measuring tool.

Laser beam

Rotation of
the laser
beam
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1 609 92A 8LK | (20.04.2023)
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