JDC Electronic SA Geos 11 - Manual (Page 37)

Calibration of the Pressure Sensor
This operation is reserved to those professionals who hold a
highly accurate laboratory standard. The consequence of any
wrong calibration will be to supply erroneous data on all the
measurements relating to pressure.
Calibration is carried out from the measuring mode for absolute pressure.
Proceed in the same way as with the other calibrations. The number
displayed on the middle block indicates the shift in 1/32th hectopascals,
and the lower block shows the absolute pressure on the sensor. Other
calibrations are possible, but only via SkywatchLog.
Technical Specifications
Precision
Wind speed ± 2%
Temperature ± 0.5°C at 25°C
Humidity ± 2% at 50%rH
Pressure ± 0.5% at 25°C
Compass ± 3°
Clock <0.1 second per day possible if calibrated
Display resolution
Wind speed 0.1 unit <99.9 then 1 unit >100
0.1 at 25.0 Beaufort
Temperature 0.1° <99.9° then 1° >100
Windchill temperature 0.1° <99.9° then 1° >100
Dew point 0.1° <99.9° then 1° >100
Humidity 0.1%rH
Pressure 0.1 hPa - 0.01inHg
Altitude 0.1m from -999.9m to 3,000m
0.5m from 3,000 to 10,000m
1m from 10000 to 21,535m
Density altitude 1 unit
QFE height 0.1 m - 1 ft (foot)
Variometer 0.1 unit
Barometric Tendency 0.1hPa - 1inHg
Compass 1°
Response time of sensors
Wind speed instantaneous
Temperature From a few seconds to several minutes
depending on wind speed
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