Sec. 10.21.08.05. Requirements for the Acoustical Environment

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The test tones listed in this regulation shall meet the allowable octave-band ambient noise levels which are noted in the following table taken from page 5 of the May 1985 ASHA journal:

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Test frequency	500	1000	2000	4000
Octave-band cutoff	300	600	1200	2400
Frequencies	600	1200	2400	4800
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Octave-band level: Ear covered with earphone mounted in MX-41/AR cushion	21.5	29.5	34.5	42
Plus ASHA screening level	20	20	20	20
Resultant maximum ambient noise level allowable for ASHA screening	41.5	49.5	54.5	62

                    
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