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NOTE: When adjust the screws of plummet reticle, firstly loosen the screw on the
moving direction of reticle, secondly tighten another screw by the same mount, clockwise
turning is for tightening, and anticlockwise turning is for loosening, the turning mount for
tightening or loosening should be same.
26.6 Laser Plummet
1)Check
Set the instrument on stable device and fix it.
①
Set a cross mark on the ground under the instrument.
②
Turn the laser switch on and focus it accurately.
③
Turn the three leveling screws until the instrument keeps leveling and the laser spot
④
coincides with the cross mark on the
ground.
⑤
Rotate the instrument 180°(200g) around
and check the laser spot and cross mark
,
if
they coincide, adjustment is not required.
Otherwise, adjust it.
2)Adjustment
Setting up the instrument on the checking
①
tool or tripod which is 1.5m apart from
ground.
Turn on laser plummet, turn tribrach foot screws until laser spot coincides with cross
②
mark.If you use tripod,make a cross mark on the laser spot directly.
Rotate instrument 180°
③
around, if the laser spot is over 2mm apart from cross mark,
remove the protecting cover firstly, adjust two screws with 1.5mm hexagon wrench to
move laser spot to the cross mark, correct only one-half of the displacement in this
manner.Adjusting details see attached figure.
Repeat steps 2 and 3 unti
④
l laser spot coincides with cross mark always when rotate
instrument.
Note
:There are three screws mounted
around laser plummet part,only two screws
are used for laser accuracy adjustment.
Un-adjustable
screw
Adjustable
screw