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4.2 Preparation
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.
Before determining the instrument errors, the instrument has to be
levelled using the electronic level. SHIFT (F12) to access STATUS
Level & Laser Plummet, Level page.
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 turbu-
lence. The best conditions are early in the morning or with overcast
sky.
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