Calibrating Air Pressure Sensor: It’s switched to air
pressure sensor calibration state, when the MODE button
is long pressed in the air pressure measurement state. Its
display is as show in the above picture. The value displayed
on LCD panel is the offset between the pressure measured
by sensor and the real air pressure, which is used to calibrate
the air pressure sensor.
For example: The value of current air pressure mea-
sured by sensor is 1013.2hPa, and the real air pressure
value is 1013.1hPa, then the calibration offset can be got
by subtracting 1013.2hPa from 1013.1hPa. The real air
pressure value can be obtained from weather report, a
certificated high-accuracy barometer, and so on. This op-
eration can advance the pressure sensor accuracy.
Setting Calibration Offset: Short press the MODE button
to scroll to next setting option; Short press the FUNCTION
button to change the current setting option value, which
is blinking; The range of the pressure calibration offset is
–9.9hPa to 9.9hPa, that can be set by user; To save the user
data with long press the MODE button, when the setting is
completed. If the setting state is exit by device with none
button activated in 30 seconds, the setting value will not
be saved.
>20 <
> 21 <
ALTI MODE
It’s switched to ALTI mode with long press the MODE
button in normal state of BARO mode. And it displays as
show in the above pictures.
“ALTI” is the indicator of the ALTI mode;
“-13.4M” is the value of the altitude at which the de-
vice is;
The display range of altitude is –999.9m to 9000.0m.
Setting Air Pressure of Reference Altitude: To enter
setting state of ALTI mode, with long press the MODE
button in normal state of ALTI mode. It displays as show in
the above picture. The value should be set to the absolute
barometric pressure of the reference altitude. And the value
displayed in ALTI normal state is reference altitude referring
to the altitude, which is set by user in this state. When the
Air Pressure of the Reference Altitude is set to be the same
number like the current Baro Pressure, then the Reference
Altitude will be around 0 meter.
Calibrating the Altimeter
Because this product relies on the barometric pressure
to determine the elevation and the pressure at any given
elevation can fluctuate, calibrate the altimeter to increase
