Hilti PR 3-HVSG, Manual, Page: 13 / 17

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6. Press the inclined plane mode button. The inclined plane mode LED then lights on the control panel
of the rotating laser. The tool then begins automatic self-leveling. The laser switches on and begins to
rotate as soon as this is complete.
7. Set the slope adapter to the desired angle of inclination.
Note
When the angle of inclination is set manually, the PR 3-HVSG levels the laser plane once and then
fixes it. Vibration, changes in temperature or other influences that may occur during the course of
the day may affect the position of the laser plane.
6.5 Working with the PRA 2 remote control unit
The PRA 2 remote control unit makes working with the rotating laser more convenient and is required in
order to make use of certain functions.
Selecting the speed of rotation
After switching on, the rotating laser always begins to operate at a speed of 300 revolutions per minute. A
slow speed of rotation can make the laser beam appear much brighter. A high speed of rotation makes the
laser beam appear more stable. The speed of rotation can be adjusted by pressing the rotation speed button
several times.
Selecting the line function
The area covered by the laser beam can be reduced to a line by pressing the line function button on the remote
control unit. The laser beam then appears considerably brighter. The length of the line can be adjusted by
pressing the line function button several times. The length of the line depends on the distance of the laser tool
from the wall or surface. The laser line can be shifted as desired by pressing the direction buttons (right/left).
6.6 Deactivating the shock warning function
1. Switch the tool on.
2. Press the “Deactivate shock warning” button. The shock warning deactivation LED lights constantly,
indicating that the function has been deactivated.
3. To return to standard operating mode, switch the tool off and then switch it back on again.
6.7 Checking the main and transverse horizontal axes 8
1. Set up the tripod approx. 20 m (66 ft) from a wall and adjust the tripod head horizontally with a spirit level.
2. Mount the tool on the tripod and use the visual sighting method (front and rear sights) to aim the tool at
the wall.
3. Use the receiver to catch the laser beam and mark a point (point 1) on the wall.
4. Pivot the tool clockwise through 90° about its own axis. In doing so, ensure that the height of the tool
does not change.
5. Use the laser receiver to catch the laser beam and mark a second point (point 2) on the wall.
6. Repeat the two previous steps twice and use the laser receiver to catch the beam and mark points 3 and
4 on the wall.
Note
If the procedure has been carried out accurately, the vertical distance between the two marked
points 1 and 3 (main axis) or, points 2 and 4 (transverse axis), should each be less than 3 mm
(at 20 m) (0.12" at 66 ft). If the deviation is greater than this, the tool should be returned to Hilti
Service for calibration.
6.8 Checking the vertical axis 9 , 10
1. Place the tool in the vertical position on the floor or ground, which should be as flat as possible, approx.
20 m (66 ft) from a wall.
2. Adjust the position of the tool so that the grips are parallel to the wall.
3. Switch the tool on and mark the reference point (R) on the ground or floor.
4. With the aid of the receiver, mark point (A) low on the wall. Select medium speed.
5. With the aid of the receiver, mark point (B) at a height of approx. 10 m (33 ft).
6. Pivot the tool through 180° and realign it with the reference point (R) on the ground or floor and with point
(A) at the base of the wall.
7. With the aid of the receiver, mark point (C) at a height of approx. 10 m (33 ft).
Printed: 19.10.2015 | Doc-Nr: PUB / 5206781 / 000 / 02