Manual Bosch GOL 20 D Professional (page 10 of 144) (English, German, Dutch, Danish, French, Italian, Polish, Portuguese, Swedish, Turkish, Spanish, Norwegian, Finnish)

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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

30 m

– b

= d

OBJ_BUCH-1239-002.book Page 10 Monday, June 18, 2012 10:51 AM

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Bosch GOL 20 D Professional Manual

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