Abstract
The ASTM and ISO standards offer the test engineer several different options for measuring the average sound pressure levels in the receiving room during impact tests. The microphones can either be placed at discrete locations in the room, or can be manually or mechanically scanned in the room. The standards also define the minimum distance of the microphones from the walls as 1 m for the ASTM method and 0.5 m for the ISO method. We compared the average sound pressure levels using the discrete microphone method and manual scanning method. The variation between microphone positions was greater (up to 19 dB) when the microphones are allowed to be as close as 0.5 m from the walls. The scanning method showed the lowest variability, and for this test configuration, resulted in lower average sound levels in low frequency bands. The low-frequency corner method in the ISO standards was also investigated.
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