Bosch Professional GOL 20 D Original Instructions Manual page 7

OBJ_BUCH-1239-001.book Page 14 Monday, May 31, 2010 8:41 AM
14 | English
Checking the Crosshair
A measuring distance of approx. 30 m is re-
quired for the check. Set up the measuring tool
in the centre and levelling rods A and B at both
ends of the measuring distance.
30 m
a
1
A a – b = d
1 1
After aligning and focussing the measuring tool,
read the heights at both levelling rods. Calculate
the difference d between the height a
ling rod A and the height b
Example:
a = 1.937 m
1
b = 1.689 m
1
a – b = 1.937 m – 1.689 m = 0.248 m = d
1 1
a
2
A a – d = b
1 m
2
Set up the measuring tool approx. 1 m away
from levelling rod A. After aligning and focussing
the measuring tool, read the height a
ling rod A.
Subtract the previously calculated value d from
the measured height a in order to receive the
2
set value for the height b
2
Measure height b at levelling rod B. When the
2
measured value deviates by more than 6 mm
(GOL 20 D/G) or 3 mm (GOL 26 D/G) from the
calculated set value, the crosshair must be read-
justed.
1 609 929 W93 | (31.5.10)
Example:
a
2
d = 0.248 m
a
2
GOL 20 D/G: When measuring, height b
be 1.476 m ±6 mm.
GOL 26 D/G: When measuring, height b
be 1.476 m ±3 mm.
b
1
Readjusting the Crosshair
d
B
of level-
1
of levelling rod B.
1
Unscrew the eyepiece cover 4. Using the adjust-
ing pin 18, turn adjusting screw 5 clockwise or
anticlockwise, until the calculated set value for
height b
ling rod B.
Screw on eyepiece cover 4 again.
Example:
b
2
When measuring b
set.
Check the crosshair again. If required, repeat
d
the procedure or refer to an authorised Bosch
after-sales service.
B
2
at level-
2
at levelling rod B.
= 1.724 m
– d = 1.724 m – 0.248 m = 1.476 m
18
is reached when measuring on level-
2
, the value 1.476 m must be
2
must
2
must
2
5
Bosch Power Tools