| Nom | Support | Langue | Disponibilité | Date d'édition | Prix | ||
|---|---|---|---|---|---|---|---|
|
PDF |
Anglais |
Active |
20/08/2007 |
157,00 € |
|
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Détails
Includes informational spreadsheet programmed to perform the calculations specified in the standard.
This standard specifies three methods, in ascending order of complexity of use and potential
accuracy, for the estimation of the sound pressure levels that are effective when a hearing protector is
worn. The application of the procedures in turn requires an estimate of the real-ear attenuation of the
device for groups of users and an estimate of the noise levels to which the users are exposed. The
simplest method is the Noise Level Reduction Statistic for use with A-weighting (NRSA) that can be
directly subtracted from an A-weighted sound level or sound exposure estimate. A more accurate
procedure is the Noise Level Reduction Statistic, Graphical (NRSG) that requires measurements of
both the A- and C-weighted sound levels or exposures, and the application of a set of graphical data.
Potentially the most accurate approach is the octave-band method utilizing the octave-band real-ear
attenuation and noise measurement data. Each of the simplified ratings, the NRSA and NRSG, is to be
computed at both the 80th and 20th percentiles to reflect the range of performance to be expected
based on the variation in the attenuation data.
Informations supplémentaires
| Auteur | Acoustical Society of America (ASA) |
|---|---|
| Edité par | ASA |
| Type de document | Norme |
| Thème | /subgroups/2398 |
| Date de confirmation | 2020-01-01 |
| Nombre de pages | 42 |
| Mot-clé | ASA S12.68-2007 (R2017) |
| ANSI Approved |
