Abstract
The Air Conditioning and Refrigeration Institute (ARI) Standard 250 Performance and Calibration of Reference Sound Sources was used to establish one-third octave band sound power levels of several reference sound sources (RSS). The work was carried out in an anechoic chamber that was qualified at frequencies of 100 Hz and above using ANSI S12.35. Measurements were made with circular slices around the RSS at heights from 5 cm to 195 cm in 10 cm increments using both intensity and sound pressure. A 19 point fixed array was also employed for comparison of one of the sources. Sound power levels were compared from the 50 Hz to the 10<th>000 Hz one-third octave bands using several methods. The results are compared to the sound power levels provided by the manufacturer.
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