David White L6-20, LT6-900 Owner's Manual
L6-20
LT6-900
Meridian Series Owner’s Guide
www.davidwhite.com
FOR CUSTOMER SERVICE, PARTS
AND REPAIR CALL
(765) 581-4097
IMPORTANT: IMPORTANT : IMPORTANTE:
Read Before Using Lire avant usage Leer antes de usar
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With David White
your sights are set on
precision and accuracy.
Congratulations! You’ve purchased a David White builder/contractor instrument,
known throughout the world for precision and accuracy.
The purpose of this user’s guide is to acquaint you with the instrument, its
components, safety, proper care and handling.
Our levels, level-transits and transits are constructed to withstand extremely
rugged field use. Like all precision instruments, however, they should be treated
with reasonable care to prolong life and accuracy.
All instruments are adjusted when they are shipped from the factory. It is the
customer’s responsibility to check and to ensure instruments are adjusted prior
to using.
David White is not responsible for errors caused by instruments that are out of
adjustment.
Contact your distributor, dealer or David White for information on the nearest
facility to check if your instrument is properly adjusted.
All specifications are subject to change without notice.
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1
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4 17
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GENERAL SAFETY RULES
!
WARNING
Read all instructions. Failure to follow all instructions listed below
may result in serious injury.
!
WARNING
When moving a tripod-mounted instrument, handle with care. Carry
only in an upright position. Do not carry over your shoulder or in a
horizontal position. Improper handling may result in instrument damage
Handle the instrument by its base when removing from the case or attaching to a tripod.
Never use force on any parts of the instrument. All moving parts will turn freely and easily
by hand.
Check the leveling and indication accuracy of the measuring tool each time before using
and after longer transport of the measuring tool.
Protect the measuring tool against moisture and direct sun light.
Do not subject the instrument to extreme temperatures or variations in temperature.
As an example, do not leave it in vehicles for long time. In case of large variations in
temperature, allow the measuring tool to adjust to the ambient temperature before
putting it into operation. In case of extreme temperatures or variations in temperature,
the accuracy of the measuring tool can be impaired.
Avoid any impact to or dropping of the measuring tool. After severe exterior effects
to the measuring tool, it is recommended to carry out an accuracy check each time
before continuing to work.
Place the instrument in the provided case when transporting it over larger distances
(e.g. in the car). Ensure that the instrument is correctly placed in the transport case.
When placing the instrument in the case.
When carrying instrument, always remove the instrument from the tripod when
transporting or carrying it at the jobsite. If the instrument must be carried on the tripod,
hold the instrument as vertically as possible and keep it in front of you. Never carry the
instrument horizontally over your shoulder.
When transporting instrument long distances, always place in the carrying case.
SAVE THESE INSTRUCTIONS
INTENDED USE
The measuring tool is intended for determining and checking precise horizontal
partitions and angles. The LT6-900 is also suitable for measuring heights and
distances.
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FEATURES
The numbering of the product features
shown refers to the illustration of the
measuring tool on the graphic page.
1. Telescope objective lens
2. Eyepiece
3. Focusing knobs
4. Instrument level vial
5. Horizontal graduated circle
6. Horizontal vernier
7. Horizontal clamp
8. Horizontal tangent
9. Telescope lock lever
10. Vertical arc
11. Vertical arc pointer
12. Vertical clamp
13. Vertical tangent
14. Three leveling screws
15. 5/8-11 threaded base
16. Horizontal vernier
17. Bubble Level Adjustment Screw
TECHNICAL DATA
L6-20 LT6-900
Accuracy
1/4 in at 100 ft
(6mm at 30m)
1/4 in at 100 ft
(6mm at 30m)
Range
Up to 200 ft (60m) Up to 200 ft (60m)
TELESCOPE
Magnification 22-power 22-power
Length 10.5” (26.5 cm) 10.5” (26.5 cm)
Minimum Focus 4 ft (1.2 m) 4 ft (1.2 m)
Aperture 0.75" (19mm) 0.75" (19 mm)
Field of View 2' @ 100' (0.6 m @ 30 m) 2' @ 100' (0.6 m @ 30 m)
No. of Lenses 6 6
HORIZONTAL CIRCLE
Graduation Diameter 3.62" (92 mm) 3.62" (92 mm)
Graduations Each 1° Each 1°
Numbers Each 10°, 0-90-0° Each 10°, 0-90-0°
Vernier Double direct to 15 min. Double direct to 15 min.
VERTICAL ARC
Graduations Each 1°
Numbers Each 10°, 45-0-45°
CENTER Planar bearing Planar bearing
LEVEL VIAL 10 min. per 2 mm 10 min. per 2 mm
WEIGHT (Instrument) 3.25 lb (1.5 kg) 4.5 lb (2.0 kg)
TRIPOD 5/8-11 thread 5/8-11 thread
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