Preparation - Leica TS11 User Manual

4.2
TS11/TS15, Check & Adjust

Preparation

Before determining the instrument errors, the instrument has to be
levelled using the electronic level. Select Main Menu: Instrument\TPS
settings\Level bubble & compensator to access the Level Bubble &
Compensator screen.
The tribrach, the tripod and the underground should be stable and secure
from vibrations or other disturbances.
The instrument should be protected from direct sunlight to avoid thermal
warming.
It is also recommended to avoid strong heat shimmer and air turbulence.
The best conditions are early in the morning or with overcast sky.
Before starting to work, the instrument has to become acclimatised to the ambient
temperature. Approximately two minutes per °C of temperature difference from
storage to working environment, but at least 15 min, should be taken into account.
Even after adjustment of the ATR, the crosshairs may not be positioned exactly on
the centre of the prism after an ATR measurement has been completed. This
outcome is a normal effect. The telescope is not normally positioned exactly on the
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