Leica FlexLine plus - 17.7 Scale Correction

FlexLine plus, Technical Data
176
17.7 Scale Correction
Use of 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.
Atmospheric
correction
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 °C
Atmospheric corrections in ppm with temperature [°C], air pressure [mb] and height
[m] at 60 % relative humidity.
TS_108
-40
-35
-30
-25
-20
-15
-10
-5
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
105
110
115
120
125
130
135
140
50°C50°C
40°C40°C
30°C30°C
20°C20°C
10°C10°C
0°C 0°C
-10°C-10°C
-20°C-20°C
550 mb
5000 m 4500
600 650 700 750 800 850 900 950 1000 1050 mb
550 mb 600 650 700 750 800 850 900 950 1000 1050 mb
4000 3500 3000 2500 2000 1500 1000 500 0 m