CST/BERGER Theodolite DGT 10 Notice Originale page 25

– Turn the measuring tool back to the starting posi-
tion.
– If required, centre the bubble of the plate level
again.
– Now, rotate the measuring tool by 180°.
When the adjustment is correct, the bubble must now
be centred in the plate level.
Adjusting:
– Turn screw S with the provided adjustment man-
drel 30 until the bubble of the plate level is halfway
(1/2 t) between the starting point and the centre.
(see figure J3)
– Turn the measuring tool by 180° back to the start-
ing position and repeat the check.
Checking and Adjusting the Circular Bubble
Vial
Checking:
When the adjustment is correct, the circular bubble
vial must be centred after checking and adjusting the
plate level.
Adjusting: (see figures K1 – K2)
Note: Take care not to overtighten and strip the
adjustment screws (S1-3).
– Loosen one of the adjustment screws a quarter
turn with the adjustment mandrel 30 and then
tighten another adjustment screw by a quarter
turn.
– Repeat the adjustment as often as required until
the bubble of the plate level is centred.
The example in the figure shows how the bubble vial
moves when loosening screw S2 and tightening
screw S1.
Checking and Adjusting the Optical Plummet
With this adjustment, the visible line of the optical
plummet is brought into alignment with the vertical
axis.
Checking:
– Aim at a measuring point on the ground with the
optical plummet 9.
For this, either adjust the levelling screws 1 or
loosen fastening screw X of the tripod and move
the measuring tool until the optical plummet is
positioned above the measuring point.
– Now, rotate the measuring tool by 180°.
When the adjustment is correct, the optical plummet
must be positioned above the measuring point.
Adjusting:
With this adjustment, the visible line of the optical
plummet is brought into alignment with the vertical
axis of the measuring tool.
– Turn cover 29 in anticlockwise direction and
remove it. (see figure L1)
2 610 A15 111 • 23.6.09
– Loosen one of the 4 adjustment screws (O 1-4) a
quarter turn with the adjustment mandrel 30 and
then tighten another adjustment screw by a quar-
ter turn.
– Repeat the adjustment until the measuring point is
located halfway (1/2 t) between the starting point
and the crosshair.
The example in the figure shows how the adjust-
ment changes when loosening screw O3 and
tightening screw O4. (see figure L2)
– Repeat the check and the adjustment until there is
no deviation between the measuring point and the
crosshair, also when tilting the measuring tool
when in its vertical axis.
Setting the Vertical Zero Position
Worksteps
– Position the measuring tool
on a level surface. "Setting
Up/Aligning the Measuring
Tool" see page 23.
– Press and hold the V/% but-
ton and additionally press the
On/Off button 20.
The display indicates the
adjusting mode for the verti-
cal angle.
– Tilt the telescope through the
vertical zero point.
– Direct the telescope against a
measuring point at the same
height of the measuring tool
(maximal deviation 10').
– Press the V/% button.
The data for the first measure-
ment are saved.
– Tilt the telescope by 180°
and direct it against the same
measuring point again.
– Press the V/% button.
The data for the second
measurement are saved and
the (new) vertical zero point is
determined.
– Press any button.
A beep sounds and the measuring tool returns to
the standard measuring mode.
Display
Indications
V
H
R
V
H
R
V
H
R
V
H
R
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