Soft dB I-Track User guide - Manual (Page 22)

20
Temperature, Pressure and Humidity
The temperature, pressure and humidity parameters allow the user to define the atmospheric
conditions prevailing during the measurement. The software will compensate the intensity results
to provide standardised results at 20°C, 101.325kPa and 50% Humidity (ISO 5011).
Grid Precision
The grid precision defines de precision of the computing grid. Typically, the grid precision must be
about 1/100 the source size to provide a good precision over computation speed ratio. As an
example, when measuring a laundry machine, measuring about 1 m wide, a 1 cm grid precision
would be appropriate, when measuring a mining truck measuring about 8 m long, a grid precision
of about 5 to 10 cm would be sufficient.
Max Distance and Max Angle
The maximum distance and maximum angle refer to the measurement plane definition. The result
of a sound mapping measurement is a cloud of points in space. These points are roughly
distributed on a virtual measurement plane. The I-Track software will automatically compute the
optimal plane position which minimises the distance of each measurement point to the
measurement plane. Points that are located too fare from the measurement plane and that are not
perpendicular to the measurement plane will be rejected. These maximum distances and angle are
defined by the Max Distance and Max Angle parameters.
Pattern Size and Microphone Offset
The pattern size and microphone offset refer to the dimension of the probe and the visual tracking
device. These dimensions are used by the software to provide accurate positioning of the probe in
space.