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Bosch GLL 3-50 Manual

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14 | English
1 618 C00 99J | (10.10.13) Bosch Power Tools
Extending the Telescopic Legs
Unscrew the locking screw
17 for the extendable
stand. Pull out the stand.
Lock the stand by tightening
the locking screw 17.
Repeat the process for the
other two stands.
Operation
Initial Operation
Protect the measuring tool against moisture and direct
sun light.
Do not subject the measuring tool to extreme tempera-
tures or variations in temperature. As an example, do
not leave it in vehicles for long time. In case of large varia-
tions in temperature, allow the measuring tool to adjust to
the ambient temperature before putting it into operation.
In case of extreme temperatures or variations in tempera-
ture, the accuracy of the measuring tool can be impaired.
Avoid heavy impact or falling of the measuring tool. Af-
ter heavy exterior impact on the measuring tool, an accura-
cy check should always be carried out before continuing to
work (see “Levelling Accuracy”).
Switch the measuring tool off during transport. When
switching off, the levelling unit, which can be damaged in
case of intense movement, is locked.
Switching On and Off
To switch on the measuring tool, slide the On/Off switch 14
to the “on” position (when working without automatic lev-
elling) or to the “on” position (when working with auto-
matic levelling). Immediately after switching on, the measur-
ing tool sends laser beams out of the exit openings 1.
Do not point the laser beam at persons or animals and
do not look into the laser beam yourself, not even from
a large distance.
To switch off the measuring tool, slide the On/Off switch 14
to the “off” position. When switching off, the levelling unit is
locked.
When exceeding the maximum permitted operating tempera-
ture of 40 °C, the measuring tool switches off to protect the
laser diode. After cooling down, the measuring tool is ready
for operation and can be switched on again.
Deactivating the Automatic Shut-off
The measuring tool switches off automatically after an operat-
ing duration of 30 minutes. To deactivate the automatic
switch-off, keep the operating mode button 4 pressed for 3 s
while switching on the measuring tool. When the automatic
switch-off is deactivated, the laser lines briefly flash after 3 s.
Do not leave the switched on measuring tool unattend-
ed and switch the measuring tool off after use. Other
persons could be blinded by the laser beam.
To activate the automatic shut-off, switch the measuring tool
off and then on again (without the operating mode button 4
pushed).
Operation Modes (see figures A–D)
The measuring tool has four operating modes, between which
you can switch at any time:
– Horizontal operation (operating mode A): generates a
horizontal laser line
– Cross-line operation (operating mode B): generates a
horizontal and a vertical laser line
– Vertical operation (operating mode C): generates two
vertical, orthogonal laser lines,
– Horizontal operation combined with vertical operation
(operating mode D): generates a horizontal and two verti-
cal laser lines
In all operating modes, a perpendicular point is projected on-
to the floor.
Once switched on, the measuring tool is in operating mode
“D”. To change the operating mode, press the operating
mode button 4.
All four operating modes can be selected with or without auto-
matic levelling.
In cross-line and vertical operation, the vertical lines can be
aligned exactly on a measurement object using the handwheel
18.
Pulse Function
When working with the laser receiver 27, the pulse function
must be activated, – independent of the selected operating
mode.
In pulse function, the laser lines flash at very high frequency
and thus become detectable by the laser receiver 27.
To switch on the pulse function, press button 3. When the
pulse function is switched on, the pulse-function indicator 2
lights up green.
When the pulse function is switched on, the visibility of the la-
ser lines is reduced for the human eye. Therefore, shut off the
pulse function by pushing button 3 again when working with-
out laser receiver. When the pulse function is switched off,
the pulse-function indicator 2 is deactivated.
Automatic Levelling
Working with Automatic Levelling
Position the measuring tool on a level and firm support or at-
tach it to a commercially available photographic tripod.
When working with automatic levelling, push the On/Off
switch 14 to the “ on” position.
After switching on, the levelling function automatically com-
pensates irregularities within the self-levelling range of ±4°.
The measuring tool is levelled in as soon as the laser lines no
longer flash.
If the automatic levelling function is not possible, e.g. be-
cause the surface on which the measuring tool stands devi-
ates by more than 4° from the horizontal plane, the laser
OBJ_BUCH-1973-002.book Page 14 Thursday, October 10, 2013 4:45 PM
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