Norsonic NOR150, Instruction Manual

Page: 128 / 216

112 Chapter 21
Sound Intensity
Surface
Segment
Front
Left
Back
Right
Top
in surface Left
the Front surface
Figure 21.25 - The cuboid is divided into surfaces, and each
surface is built up of one or more segments. Figure 21.26 - Intensity measurement with fi xed probe
positions.
Figure 21.27 - Intensity measurement using the scanning
method.
The ability to measure twice on a single measurement
surface is exploited when measuring intensity by
scanning, where standards require the evaluation of
repeatability between two orthogonal scans.
Each segment is defi ned by its physical dimensions,
resulting in an area. The area is used for calculation
of sound power. Figure 21.26 and 21.27 illustrates two
common ways of measuring intensity on a surface.
To defi ne the measurement surface, push
SETUP
and
tap into
Surface defi nition
menu as illustrated in Figure
21.28.
Start with the
Surface type
to select a baseline geometry.
After selecting the surface type, the overall dimensions
are defi ned in the
Surface dimensions
menu. These
dimensions will be used to generate the surfaces and
segments making up the total surface, as illustrated in
Figure 21.29. The defi ning dimensions are illustrated
on the instrument.