CST/BERGER N Serie Manual Original página 10

OBJ_BUCH-928-001.book Page 10 Wednesday, January 21, 2009 1:21 PM
Operation
Avoid heavy impact to or falling down of the
measuring tool. After severe exterior effects to
the measuring tool, it is recommended to carry out
an accuracy check (see "Checking the Line-of-
sight (see figures K – L)") each time before contin-
uing to work.
Setup and Basic Adjustment
Note: Before using for the first time, check the level
according to the instructions in chapter "Checking the
Line-of-sight (see figures K – L)".
Set up the tripod and attach the level using the tripod
mounting screw.
Adjust the tripod legs until the tripod head is roughly
level, and adjust the level with the levelling screws 11.
Centre the bubble of the vial 13 in the inner ring.
Turn levelling screws (A and B) 11 to move the bubble
so that it is positioned between A and B.
(see figure A)
Now turn levelling screw (C) 11 to centre the bubble.
(see figure B)
Focusing
Turn the automatic level so that it points toward a
bright background or hold a white sheet of paper in
front of the objective 9. Turn the eyepiece 5 until the
crosshair is clearly and well visible. (see figure C)
Locate a levelling rod using the optical peep sight 8
and turn the focusing knob 6 until the graduation field
is clearly visible. (see figure D)
Reading the Levelling Rod
Note: After finishing work, we recommend checking
the measurements taken by carrying out a few control
measurements from a different tool setup location
approx. 15 m away from the original setup location.
Aim at several previously measured points. The new
readings should correspond with the first ones.
If this is not the case, try checking the automatic level
once more according to the instructions in chapter
"Checking the Line-of-sight
Adjust the reticle again (see chapter "Reticle Calibra-
tion (see figure M)") or contact an authorised cus-
tomer services agent for Bosch power tools.
Height Reading
Read the height at the target line. For example: The
height in Fig. E is 1.195 m.
10 | English
Distance Measurement
Read the heights at the top and bottom stadia hairs.
Pay attention that the levelling rod is vertical. For
example: Fig. E shows 1.352 m and 1.038 m. The dif-
ference is multiplied by 100 to get the "tool-levelling
rod" clearance. (1.352 m – 1.038 m) x 100 =
31.41 m.
Angle Measurement (see figure F)
Sight point A with the crosshair and set the horizontal
circle 2 to 0 at mark 3. Afterwards, sight point B and
read the measured angle at mark 3.
Calibration
Note: Although all automatic levels have been fac-
tory-calibrated and thoroughly checked prior to ship-
ment, we recommend checking the calibration of the
circular bubble vial 13 and the reticle from time to
time.
Compensator/Compensator Lock
Check the compensator for proper operation before
use. Push and release the compensator lock button 4
to shake the compensator.
Write down the height after the compensator comes
to a stop, repeat the procedure and read the value
again. Both heights should exactly correspond.
Adjusting the Bubble Vial (see figure G – J)
Centre the vial bubble 13 using the levelling screws
11 and then rotate the automatic level by 180°. The
bubble 13 should remain centred. If this is not the
case, the bubble vial requires adjustment.
Turn the levelling screws 11 and bring the bubble half-
way to centre. Turn both levelling screws 14 until the
bubble is centred.
Rotate the automatic level by 180°. When the correc-
tion was carried out precisely, the bubble will be cen-
tred. If this is not the case, repeat the complete
procedure.
Checking the Line-of-sight (see figures K – L)
Select 2 fixed points A and B that are 30 – 50 m apart
from each other and set up levelling rods appropri-
ately. Position the automatic level midway between
(see figures K – L)". both points and carry out the basic calibration. Read
off the heights on both rods. The height at rod A is a1,
and b1 at rod B. The difference (a1 – b1) results in
value H.
Move the automatic level to a new position approx.
1 – 2 m away from rod A. Centre the vial bubble again
and read the heights at rods A and B. The read values
are a2 and b2.
When values a1 – b1 = a2 – b2 = H correspond
(max. difference 3 mm ), the calibration of the reticle is
correct, and the line-of-sight is horizontal; if not, it
must be readjusted.
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