Scale Correction - Leica FlexLine plus User Manual

17.7
Use of scale
correction
Atmospheric
correction
Atmospheric
corrections °C
FlexLine plus, Technical Data

Scale Correction

By entering a scale correction, reductions proportional to distance can be taken into
account.
• Atmospheric correction.
• Reduction to mean sea level.
• Projection distortion.
The slope distance displayed is correct if the scale correction in ppm, mm/km, which
has been entered corresponds to the atmospheric conditions prevailing at the time of
the measurement.
The atmospheric correction includes:
• Adjustments for air pressure
• Air temperature
For highest precision distance measurements, the atmospheric correction should be
determined with:
• An accuracy of 1 ppm
• Air temperature to 1°C
• Air pressure to 3 mbar
Atmospheric corrections in ppm with temperature [°C], air pressure [mb] and height
[m] at 60 % relative humidity.
550 mb 600 650
50°C
40°C
30°C
20°C
10°C
0°C
-10°C
-20°C
550 mb 600 650
5000 m 4500 4000 3500
TS_108
700 750 800 850
700 750 800 850
3000 2500 2000 1500
900 950 1000 1050 mb
900 950 1000 1050 mb
1000 500 0 m
50°C
40°C
30°C
20°C
10°C
0°C
-10°C
-20°C
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