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OL28XTM OPERATING INSTRUCTIONS
Getting Started
The OL28X is best operated on a heavy duty domed top tripod (Redbacl
model HDD51). Place the Dumpy Level on the tripod and locate the locking
screw into the base of the unit. Before tightening the screw completely
roughly level the OL28X on the dome of the tripod, using the bubble vial as
a guide. The locking screw can now be tightened and the three adjustment
feet used to bring the bubble in the vial into the circle. Note: The bubble
vial is used only to get the dumpy into self levelling range (anywhere within
the circle) once in range the automatic compensator takes over and levels
the view through the dumpy to a high level of accuracy.
Next, the front of the dumpy level needs to be pointed at the required
target/staff. This is achieved with the help of the sight built into the top
housing. Rotate the complete level on its base to be roughly aimed then
whilst looking through the eyepiece of the unit use one of the ne rotation
adjustment knobs (either on the right or left of the unit - see diagram
page4) to get on target.
The OL28X will require focussing depending on the distance the target/staff
is away from the unit. Focus the dumpy by looking through the eyepiece
and turning the large focus knob on the right hand side of the unit.
The Cross Hair may also need focussing this is done by rotating the eyepeice
itself whilst looking through it untill you see a clear and sharp vertical
and horizontal cross hair lines. Note it is possible to make the cross hair
completely disapear with this adjustment.
