It is also recommended to avoid strong heat shimmer and air turbulence. 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.
) Note, that even after good adjustment of the ATR, the crosshairs might not be posi- tioned exactly on the centre of the prism after an ATR measurement has been executed. This is a normal effect. To speed up the ATR measurement, the telescope is normally not positioned exactly on the centre of the prism. The small rest devia- tions, the ATR offsets are measured individually for each measurement and
The instrument should be protected from direct sunlight in order to avoid thermal warming.
)
Before determining the instrument errors, the instrument has to be levelled- up using the electronic level. SHIFT F12 to access STATUS Level & Laser Plummet, Level page.
The tribrach, the tripod and the underground should be very stable and secure from vibrations or other disturbances.
Check & Adjust
5.2 Preparation
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TPS1200
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Leica TPS1200 user manual
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