7
3. Function
Function principal
The
m
2
device is an electronic safety device, operating on the principal of pressure sensing. The primary tool for determining the altitude
and the falling speed is a pressure sensor. The calculation of the altitude is made based on the difference of two atmospheric pressures:
the current altitude pressure and the landing area „GROUND ZERO“ pressure. The landing area pressure is measured and set when
the device is switched on, during calibration. This pressure is automatically adjusted to barometric pressure changes during the day
without the need of user intervention. The
m
2
checks the ambient barometric pressure every 32 seconds and evaluates possible aircraft
takeoff. If takeoff is confirmed, the
m
2
will start checking the skydiver’s altitude and his falling speed. The pressure sensor monitors the
actual atmospheric pressure 8x per second during free fall; the received information is evaluated by means of a microprocessor and
sophisticated software and recalculated to the real falling speed and actual altitude. Thanks to this, the
m
2
device is able to use the cutter
to cut the closing loop on the reserve parachute and initiate its opening upon meeting the preset limits of the falling speed in combination
with the altitude above landing area. The device is activated only upon meeting the set limits which are different for the individual
m
2
EXPERT, m
2
STUDENT, m
2
TANDEM
or
m
2
SPEED
.
The device is responsible solely for cutter activation as per specified limits, and for cutting the closing loop of
the reserve parachute. It is not responsible for the correct and full function of the whole harness system with the
container, reserve parachute, and other accessories!!!
Function Modes
The
m
2
was designed to be an extremely simple safety device to use. Most users just want to switch the AAD on before
the first jump and no longer worry about it. In addition to the standard mode, which the user will use the most, the
m
2
software also enables other functional modes: a mode for landing above the aircraft’s take off, a mode for landing below the
aircraft’s take off and X mode, for the temporary change of parameters. Changing the mode changes the device parameters.
Therefore, always think twice about what you are doing. The mode is selected during the
m
2
activation sequence. After
manual or automatic device switch off, the default STANDARD mode is set. The current active mode is displayed by an icon
on the display.
STANDARD-mode
UP-mode
DOWN-mode
X-mode
UP- mode or DOWN-mode are used if the landing location is higher or lower than the take-off location. The
m
2
allows the
setting of various altitudes for the landing location within the range of +/- 990 m (+/- 2,990 ft), and it is set in increments of
10 m (10 ft). X-mode allows non-standard device override.
3.1
3.2