Klein Tools AESEM1 Manual De Instrucciones página 6

ENGLISH
NOISE REDUCTION RATING (NRR)
The NRR for the AESEM1 Bluetooth Earmuffs is 20dB. It is tested and
in accordance with ANSI S3.19-1974. To ensure adequate hearing
protection, the earmuffs must be properly fitted according to the
FITTING EARMUFFS section.
ANSI S3.19-1974 TESTING
Frequency
125 250 500 1000 2000 3150 4000 6300 8000 NRR
(Hz)
Mean
Attenuation 16.7 22.9 20.8 24.6 36.1 39.6 42.8 38.2 37.3
Standard
3.5 2.1 2.0 3.1 3.1 3.3 3.2 2.9 2.9
Deviation
NOTE: The above table is based on a headband force of 13N.
The level of noise entering a person's ear when the hearing
protector is worn as directed, is closely approximated by the
difference between the A-Weighted environmental noise level and
the Noise Reduction Rating (NRR).
EXAMPLE:
• The environmental noise level as measured at the ear is 89dB(A).
• The NRR is 20dB.
• The level of noise entering the ear is approximately equal to
69dB(A).
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