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6
Performing a measurement
6.1
Method of measurement
Sound intensity measurements are performed on an integrating box around the device under test
(DUT). Each surface is measured using a scanning technique to measure the average sound
intensity of this surface. The sound intensity level can then be converted to sound power level
using the area of the measuring surface.
The scanning path must be uniformly distributed on the measurement surface and it must be
followed with the probe at a constant speed. For more information on how to select an appropriate
path, refer to ISO 9614-2 standard.
The probe must be held so that:
•
The reference axis of the probe is perpendicular to the measurement plane;
•
The measurement surface crosses the reference axis of the probe at the reference point of
the probe;
•
The probe reference direction must be pointing towards the source (into the bounding
box).
Reference Axis
Measurement
Surface
Mic 1
Mic 2
Sound Source
