Zoom80 | 166Technical Data
7.1.8 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 D1
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
• Relative humidity
For highest precision distance measurements, the atmospheric correction
should be determined with an accuracy of 1 ppm. The following parameters
must be redetermined:
• Air temperature to 1 °C
• Air pressure to 3 mbar
• Relative humidity to 20 %
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