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94TPS1200
Check & Adjust
5.2 Preparation
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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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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
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.
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 turbulence.
The best conditions are usually early in the morning or with overcast sky.