Bosch GOL Professional 20 D - Manual (Page 10)

10 | English
1 619 929 L41 | (18.6.12) Bosch Power Tools
Direct the telescope towards the levelling rod, if required with
help of the optical peep sight 2. Turn the focusing knob 16 un-
til the graduation field of the levelling rod appears sharp. Align
the crosshair exactly with the centre of the levelling rod by
turning the horizontal drive screw 14.
When the telescope is correctly focussed, the crosshair and
the image of the levelling rod must remain aligned when mov-
ing your eye behind the eyepiece.
Measuring Functions
Always set up the levelling rod exactly vertical. Direct the
aligned and focussed measuring tool against the levelling rod
in such a manner that the crosshair faces centrally against the
levelling rod.
Reading Off the Height
Read off the height of the levelling rod at the
centre line of the crosshair.
Height measured in the figure: 1.195 m.
Measuring a Distance
Centre the measuring tool above the point
from which on the distance is to be measured.
Read off the height of the levelling rod at the
top and bottom stadia lines. Multiply the differ-
ence of both heights by 100 to receive the dis-
tance from the measuring tool to the levelling
rod.
Distance measured in the figure:
(1.347 m – 1.042 m) x 100 = 30.5 m.
Measuring Angles
Centre the measuring tool above the point from which on the
angle is to be measured.
Direct the measuring tool against point A. Rotate the horizon-
tal circle 10 with the zero point toward the reference mark 9.
Then direct the measuring tool against point B. Read off the
angle at the reference mark 9.
GOL 20 D/GOL 26 D/GOL 32 D: Angle measured in the
example: 45°.
GOL 20 G/GOL 26 G/GOL 32 G: Angle measured in the
example: 45 gon.
Accuracy Check of the Measuring Tool
Check the levelling and indication accuracy of the measuring
tool each time before using and after longer transport of the
measuring tool.
Checking the Circular Bubble Vial
Align the measuring tool with the levelling screws 12 so that
the air bubble is positioned in the centre of the circular bubble
vial 7.
Rotate the telescope by 180°. When the air bubble is no long-
er in the centre of the circular bubble vial 7, the circular bub-
ble vial must be readjusted.
Readjusting the Circular Bubble Vial
Bring the air bubble of the circular bubble vial
7 in a position between the centre and the end
position of the check by turning the levelling
screws 12.
Using the Allen key 17, turn the adjusting screws 11 until the air
bubble is positioned in the centre of the circular bubble vial.
Check the circular bubble vial by rotating the telescope by
180°. If required, repeat the procedure or refer to an author-
ised Bosch after-sales service.
Checking the Compensator
After aligning and focussing the measuring tool, measure the
height at a reference point. Then press the lock button of the
compensator 8 and release again. Measure the height again at
the reference point.
If both heights do not exactly match, have the measuring tool
repaired by an authorised Bosch after-sales service.
Checking the Crosshair
A measuring distance of approx. 30 m is required for the
check. Set up the measuring tool in the centre and levelling
rods A and B at both ends of the measuring distance.
A B A
B
x°
9
10
9
10
17
11
A B
30 m
a
1
b
1
d
a
1
– b
1
= d
OBJ_BUCH-1239-002.book Page 10 Monday, June 18, 2012 10:51 AM