Preparation - Leica Builder Series User Manual

Builder, Check & Adjust
14.2
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Preparation

Before determining the instrument errors, the instrument has to be
levelled-up using the electronic level.
The tribrach, the tripod and the underground should be very stable
and secure from vibrations or other disturbances.
The instrument should be protected from direct sunlight in order to
avoid thermal warming.
It is also recommended to avoid strong heat shimmer and air turbu-
lence. The best conditions are usually 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.
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