Of this part, the exchange rate is 5 decibels (5 dB).Īny device or material, capable of being worn on the head or in theĮar canal, sold wholly or in part on the basis of its ability to reduce the level of soundĮntering the ear, and which has a scientifically accepted indicator of noise reduction Halving of the allowable exposure time to maintain the same noise dose. The amount of increase in sound level, in decibels, which would require Hearing threshold level) and the threshold of hearing of the individual beingĪ TWA 8 of 105 dBA, or equivalently, a dose of 800% of that permitted by the standard, integrating all sound levels from 90 dBA to at least 140 Is the difference between audiometric zero (reference pressure equal to 0
For measuring hearing threshold levels, the decibel.Sound pressure of 20 micropascals (µPa), which is the threshold of normal hearing Logarithm of the ratio of the measured sound pressure to the standard reference For measuring sound pressure levels, the decibel is 20 times the common.
The sound level which, if applied for 8 hours, results in a dose of 100%Ī unit of measure of sound pressure levels, defined in one of two ways,
Revised baseline audiogram for such a purpose. The audiogram recorded in accordance with Section 62.170 of this part against which subsequent audiograms are compared to determine the extent of hearing loss, except in those specific situations in which this part requires the use of a Is certified by the American Speech-Language-Hearing Association (ASHA) or licensedīaseline audiogram. Occupational Noise Exposure Standard APPENDIX B - GLOSSARY OF TERMSĪn 8-hour time-weighted average sound level (TWA 8) of 85 dBA, orĮquivalently a dose of 50%, integrating all sound levels from 80 dBA to at least 130 dBA.Ī professional, specializing in the study and rehabilitation of hearing, who