Regulation .05 Requirements for the Acoustical Environment.
Regulation .05 Requirements for the Acoustical Environment.LinkCopy Citation
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:
| Test frequency | 500 | 1000 | 2000 | 4000 |
| Octave-band cutoff | 300 | 600 | 1200 | 2400 |
| Frequencies | 600 | 1200 | 2400 | 4800 |
| 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 |