35
6.2.1.1 Calculation of Atmospheric Correction
●
The
value
of
Atmospheric
Correction
can
be
influnced
by
air
pressure,
air
temperature
and
the
height.
The
calculating
formula
is
as
follows:
(calculating
unit
：
meter)
PPM
=
273.8
‐
0.2900
×
Pressure
Value
（
hPa
）
1
+
0.00366
×
Temperature
value
（℃）
If
the
pressure
unit
adopted
is
mmHg:
make
conversion
with:
1hPa
=
0.75mmHg.
●
The
standard
atmospheric
condition
of
WinCE
Series
(e.g.
the
atmospheric
condition
under
which
the
atmospheric
correction
value
of
the
instrument
is
zero
)
:
Pressure
：
1013
hPa
Temperature:
20
℃
If
regardless
of
atmospheric
correction,
please
set
PPM
value
as
0.
OPERATIONAL STEPS
OPERATION
DISPLAY
①
In the menu of total
station,click “System Setup”
and then click”Atmospheric
Parameters”.
[System Setup]
[Atmospheric
paramaters]
②
Current Atmospheric
Parameters display on the screen.
use stylus and input the new data.
For instance, set
the temperature as 26
°
C
Input
Temperature
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