David White LT8-300, Owner'S Manual

-9-

OPERATION

Initial Operation

!

WARNING

  Protect the instrument 

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 instrument 

to adjust to the ambient temperature 

before putting it into operation.

 In case 

of extreme temperatures or variations 

in temperature, the accuracy of the 

instrument can be impaired.

Avoid heavy impact or falling of the 

instrument. 

After heavy exterior impact on 

the instrument, an accuracy check should 

always be carried out before continuing 

to work.

Setting Up Instrument

!

WARNING

  It is important that the 

tripod is set up firmly. 

Make sure that the tripod points are well 

into the ground.

 On paved surfaces, be 

sure the points hold securely.

The legs should have about a 3-1⁄2 foot 

spread, positioned so the top of the tripod 

head appears level. 
If using a tripod with adjustable legs, be 

sure the leg clamps are securely hand 

tightened.
Before setting up your instrument, be sure 

clamps are loosened and both telescope 

lock levers are in the closed position. 
Attach the instrument to the tripod 

securely, hand tightening the instrument 

base to the 5/8-11 tripod head.

Setting Up Over a Point 

!

WARNING

  Never use force on any 

parts of the instrument. 

All moving parts will turn freely and easily 

by hand.

Hang the plumb bob (LT8-300), attach 

cord to the plumb bob hook of the tripod.
The LT8-300P is equipped with an optical 

plummet. The LT8-300LP is equipped 

with a laser plummet. 
This eliminates the need to use a plumb 

bob. The instrument is set up over a 

reference point by looking through an 

eyepiece and optically lining up over 

the point (LT8-300P) or using the laser 

plummet beam (LT8-300LP).
Move the tripod and instrument over the 

approximate point. (Be sure the tripod 

is set up firmly again. Loosen leveling 

screws and shift the instrument laterally 

until the instrument is positioned directly 

over the point. 

Positioning LT8-300P Directly Over Point

When looking through the eyepiece 

19 

the light path

is reflected through 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.