SHANGHAI ESURVEY GNSS CO., LTD.
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Prism Type and Prism Contrast
o When a prism is used, the selection includes:
Self-adjustment (Range: -999.9mm ~ +999.9mm)
o When a sheet is used, the prism type includes:
Sheet
User define
o When no prism is used, the prism type includes:
No prism
User define
Laser-Point
It is used to enable / disable laser point.
Guide Light
This is useful during staking out points. The person at the prism can be directly
guided by the flashing lights to the line of sight. The light points are visible up to a
distance of 150 meters.
5.4.2 Atmospheric Parameters
Atmospheric parameters are used to correct the influences in distance measuring caused
by the atmospheric conditions of the air.
You can set atmospheric parameters by pressing MENU and F3 EDM / 3 to select EDM
menu, and pressing F1 ATMOS in EDM SETTINS display:
Ht. a. MSL: the height above the sea level at the instrument location.
Temperature: the air temperature at the instrument location.
Pressure: the air pressure at the instrument location.
Atmos PPM: the atmospheric PPM.
Refract: the refraction coefficient for the atmospheric conditions, which is taken into
account in the calculation of the height differences and the horizontal distance.
Humidity: the atmospheric humidity.
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