Accuracy Check Of The Measuring Tool - Bosch GOL Professional 20 D Originalbetriebsanleitung

Reading Off the Height
Read off the height on the levelling rod at the
centre line of the crosshairs.
Height measured in the figure: 1.195 m.
Measuring a Distance
Centre the measuring tool over the point from
which the distance is to be measured.
Read off the height on the levelling rod at the
top and bottom lines of the crosshairs. Multiply
the difference between the two heights by 100
to get the distance 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 over the point from which the
angle is to be measured.
A
A
B
20
x °
0
10
(10)
Point the measuring tool at point A. Rotate the horizontal
circle (10) with the zero point toward the reference
mark (9). Then point the measuring tool at point B. Read off
the angle at the reference mark (9).
GOL 20 D/GOL 26 D/GOL 32 D: Angle measured in the ex-
ample: 45°.
GOL 20 G/GOL 26 G/GOL 32 G: Angle measured in the ex-
ample: 45 gon.

Accuracy Check of the Measuring Tool

Check the levelling and display accuracy of the measuring
tool each time before beginning work and after longer trans-
port of the measuring tool.
Checking the Circular Bubble Vial
Align the measuring tool using 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°. If the air bubble is no longer in
the centre of the circular bubble vial (7), the circular bubble
vial must be readjusted.
Bosch Power Tools
Readjusting the Circular Bubble Vial
Using the hex 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°. Repeat the adjustment procedure if necessary or con-
tact Bosch customer service.
Checking the Compensator
After aligning and focusing the measuring tool, measure the
height at a reference point. Then press and release the lock-
ing button of the compensator (8). Measure the height at the
B
(9) (9)
reference point again.
If the two heights do not match exactly, have the measuring
tool repaired by Bosch customer service.
40
60
50
Checking the Crosshairs
(10)
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.
After aligning and focusing the measuring tool, read off the
heights at both levelling rods. Calculate the difference d
between the height a
levelling rod B.
Example:
a
1
b
1
a
1
Move the air bubble of the circular bubble
vial (7) to a position midway between the end
position of the check and the centre by turning
the levelling screws (12).
(17)
(11)
30 m
a
1
A a – b = d
1 1
on levelling rod A and the height b
1
= 1.937 m
= 1.689 m
– b = 1.937 m – 1.689 m = 0.248 m = d
1
1 609 92A 8V7 | (05.07.2023)
English | 11
b
1
d
B
on
1