22
The standard atmospheric value of our series Total Station (i.e.
the atmospheric conditions when the correction is zero)
Atm: 1013 Pa
Temp:20
℃
The calculation of atmospheric correction
△
S= 277.825- 0.29434P/(1+0.003661T) (ppm)
In the formula:
△
S:
correction coefficient (unit: ppm)
P: atmospheric pressure (unit: hPa)
T: temperature (unit:
℃
)
3.6.1 Set up the Atmospheric Correction value (ppm) directly
You may measure the temperature and pressure to find out the
atmospheric correction (ppm) through the 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 to enter the value.
Temp.:
Press:
hpa
F1
3
F4
F2
F3
Prism c:
mm
PPM:
ppm
Signal
20
1013
0
0
Temp.:
Press:
hpa
F1
3
F4
F2
F3
Prism c:
mm
PPM:
ppm
Signal
20
1013
0
3
3.6.2 Calculate the Atmospheric Correction out with
temperature and pressure sensor
First, measure the temperature and pressure around the station in
advance.
e.g. Temp: +25
℃
atm:1017.5
Press soft key [Enter] to move inserter to the ‗Temp‘ column and
type in ‗25.0‘;
Press soft key [Enter] to move inserter to the ‗Press‘ column and
type in ‗1017.5‘;
Press soft key [Enter] to move the inserter to the [prism c]
column;
(the‗PPM‘ column now displays 3)
Press [ENT] to save the parameter. Our system will display
‗Record: ***(name of the point)‘ and exit the dialogue box. The point
is saved now.