Отзывы Hearos, Ear Plugs, Ultimate Softness Series, High 32 NRR, 4 Pair
2.51 $257 руб105 грн1315 тг
- Категория: Другие средства для ухода за ушами
- Производитель: Hearos
- Оригинальное название: Hearos, Ear Plugs, Ultimate Softness Series, High 32 NRR, 4 Pair
- Артикл: HES-02414
- Размеры: 1.3 x 8.6 x 13.2 cm
Отзыв о товаре:
Hearos, Ear Plugs, Ultimate Softness Series, High 32 NRR, 4 Pair
cattylee
22.08.2016 01:03
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Test according to ANSI Specs S3.19-1974
The level of noise entering a person's ear, when hearing protector is worn as directed, is closely approximated by the difference between the A-weighted environmental noise level and the NRR.
Attenuation Chart (ANSI S3.19-1974) | |||||||||||||||||||||||||||||||||
Frequency | 125 | 250 | 500 | 1000 | 2000 | 3150 | 4000 | 6300 | 8000 | ||||||||||||||||||||||||
Mean Attenuation (dB) | 38.4 | 40.3 | 43.2 | 41.8 | 38.6 | 45.0 | 45.7 | 49.6 | 47.3 | ||||||||||||||||||||||||
Standard Deviation (dB) | 2.9 | 3.5 | 4.0 | 3.8 | 2.6 | 2.8 | 3.5 | 3.8 | 4.3 |
Example:
- The environmental noise level as measured at the ear is 92 decibels dB(A).
- The NRR is 32 decibels (dB).
- The level of the noise entering the ear is approximately 60 dB(A).
Noise Reduction Rating 32 Decibels (When Used As Directed).
The range of noise reduction ratings for existing hearing protectors is approximately 0 to 30 (Higher numbers denote greater effectiveness).