setting up the total station over a groun point

 1- place the tripod approxi - mately over the ground point.  

2- lnspect the tripod from various sides and correct its position so that the tripod plate is roughly horizontal and about the ground point (illustration, top left). 

3- push the tripod legs firmly into the ground and use the central fixing screw to secure the instrument on the tripod.  

4- switch on the laser plummet (or , for older instruments, look through the optical plummet) and turn the footscrews so that the laser dot or the optical plummet is centred on the ground point (illustration, top right). 

5- centre the bull's -eye bubble by adjusting the lengthes of the tripod legs (illustration below).  

6- After accurately levelling up the instrument,re- lease the cantral fixing screw so that you can displace it on the tripod plate until the laser dot is centred precisely over the ground point. 

7- Tighten the central fixing screw again.