David White LT8-300, Руководство пользователя

Страница: 10 / 16

-10-
- Use the optical plummet to view the
reference point on the ground. Sight
through the optical plummet eyepiece
19 located beneath the telescope
eyepiece.
- Turn the optical plummet eyepiece 19
to bring the crosshairs into focus.
NOTE: The image seen in the eyepiece is
reversed left to right. This is important to
remember when shifting the instrument or
tripod to center over the reference point.
- Line up the crosshairs with the
reference point.
If necessary, the instrument can be
shifted by loosening the tripod center stud
and sliding the instrument from side to
side for proper positioning.
Positioning LT8-300LP Directly Over Point
To switch ON the laser plummet, press
and release the ON switch 19 . A laser
point will project through the center of the
instrument to the reference point (a stake
on the ground).
- Line up the tripod over the reference
point.
- Remove the plumb bob hanger from
the center stud of the tripod.
- Attach the instrument to the tripod.
- Level the instrument.
- Line up the laser point with the
reference point.
If necessary, the instrument can be
shifted by loosening the tripod center stud
and sliding the instrument from side to
side for proper positioning.
Leveling the Instrument
Set the instrument leveling screws.
Turn down the leveling screws until firm
contact is made with the instrument base.
!
CAUTION
Do not overtighten the
leveling screws. It is
very possible to overtighten the leveling
screws. Only a firm contact between the
screws and the base is necessary. If the
instrument shifts on the base, turn down
the screw more firmly by hand.
Leveling the instrument so the vial bubble
remains centered through a 360° rotation
of the telescope is the most important
operation in preparing to use your
instrument.
When leveling your instrument, be sure
not to touch the tripod. Follow these
instructions carefully.
Line up the telescope so that it is directly
over one pair of leveling screws.
Grasp these two leveling screws with the
thumb and forefinger of each hand.
Turn both screws at the same time by
moving your thumbs toward each other
or away from each other, until the bubble
is centered.
When the bubble is centered, rotate the
telescope 90 degrees over the second
pair of leveling screws and repeat the
thumbs in, thumbs out leveling procedure
until the bubble is again centered.
Shift back to the original position and
check the level.
Optical
Plummet
Eyepiece
Reference
Point