18
Continuing with the explained operation in
3.4
, you may
press [Signal] and the intensity of signal is displayed in the
‘Signal’ column above. The minimum measurable intensity
should be 1. Being less than 1 indicates that the target cannot be
aimed and measured. You can press any other keys to quit signal
detection.
3.6 Set up the Atmospheric Correction
When measuring distance, the measured value will be
influenced by the atmosphere. In order to reduce the influence, a
atmospheric correction parameter is needed.
Temperature: the surrounding atmospheric temperature
Atmospheric pressure: the surrounding atmospheric
pressure
PPM: the calculated and predicted atmospheric correction
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