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