CHC
CTS-112R4 user manual
26
11)
Rotate the instrument horizontally by loosening the horizontal clamp screw and place the plate vial
parallel to the line connecting leveling screw A and B, and then bring the bubble to the center of the
plate vial by turning the leveling screws A and B.
12)
Ro
tate the instrument 90º(100g) around its vertical axis and turn the remaining leveling screw or
leveling C to center the bubble once more.
13)
Repeat the steps 1 and 2
for each 90°
(100 gon) rotation of the instrument and check whether the
bubble is correctly centered in all directions.
6.2.2.
Centering by using the laser plummet
1)
Set up the tripod.
2)
Lift tripod to suitable height, ensure equal length of three legs, spread and make tripod head
parallel to the ground, and place it right above the measurement station point. Prop up tripod on
the ground and fix one leg.
3)
Install instrument and collimate the point
4)
Set instrument carefully on tripod, tighten the central connecting screw. Hold the other two unfixed
legs with both hands and adjust position of these two legs through observation of laser plummet. As
it approximately aims at the station point, make all three legs fixed on the ground. Adjust three leg
screws of the instrument to make laser plummet collimate precisely to the station point.
5)
Use circular vial to roughly level the instrument.
6)
Adjust length of three legs of tripod; make the circular vial bubble of the instrument in the middle.
7)
Use plate vial to level the instrument accurately.
8)
Rotate the instrument horizontally by loosening the Horizontal Clamp Screw and place the plate vial
parallel to the line connecting leveling screw A and B, and then bring the bubble to the center of the
plate vial by turning the leveling screws A and B.
9)
Rotate the instrument 90
℃
, make it perpendicular to the connecting line of level screws A and B.
Turn level screw C to make the bubble of the plate vial in the middle.
10)
Precisely centering and leveling.
11)
Through observation of laser plummet, slightly loosen the central connecting screw and move the
instrument evenly (Don’t rotate the instrument), making the instrument precisely collimating to the
station point. Then tighten the central connecting screw and level the instrument precisely again.
12)
Repeat this operation till the instrument collimate precisely to the measurement station point.
