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3.6 Setup of Atmospheric Correction
When measuring distances, the measured value can be
influenced by the atmosphere. In order to reduce the influence,
aatmospheric correction parameter is to be set.
Temperature: the surrounding atmospheric temperature
Atmospheric pressure: the surrounding atmospheric
pressure
PPM: calculated and predicted atmospheric correction
The standard atmospheric value of ZTS-320(R) series
Total Station (i.e. the atmospheric conditions when the
correction is „0‟)
Atm: 1013 Pa
Temp:20
℃
How is atmospheric correction calculated
△
S= 277.825- 0.29434P/(1+0.003661T) (ppm)
In the formula:
△
S: correction constant (unit: ppm)
P: atmospheric pressure (unit: hPa)
T: temperature (unit:
℃
)
3.6.1 Alter Atmospheric Correction value (ppm) directly
Measure the temperature and pressure and find out the
atmospheric correction (ppm) through correction formula or
from the atmospheric correction chart. Continuing with the
operations in 3.5, press soft key „Enter‟ to move inserter down
to the „PPM‟ column.You may now type in the found value.