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Idiomas disponibles
LABORATORY ATTENUATION
MT7H7A4610-NA
Test Frequency (Hz)
125
Mean attenuation (dB)
17,8
Standard devitation (dB)
4,4
MT7H7B4610-NA
Test Frequency (Hz)
125
Mean attenuation (dB)
18,9
Standard devitation (dB)
5,2
MT7H7P3E4610-NA*
Test Frequency (Hz)
125
Mean attenuation (dB)
19,4
Standard devitation (dB)
3,4
*LiteCom Plus Hard Hat Attached Model MT7H7P3E4610-NA was tested with 3M™ PELTOR™ Hard Hat Model G3001.
3M strongly recommends fit testing of hearing protectors. The NRR is calculated from laboratory-based attenuation data.
Research suggests that many users will receive less noise reduction than indicated by the NRR. If NRR is used to estimate
typical workplace protection, 3M recommends that it be reduced by 50% or in accordance with applicable regulations. The
Noise Reduction Rating (NRR) was obtained with the device powered off.
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.
Example
1. The environmental noise level as measured at the ear is 92 dBA.
2. The NRR is 25 decibels (dB).
3. The level of noise entering the ear is approximately equal to 67 dB(A).
CAUTION: For noise environments dominated by frequencies below 500 Hz the C-weighted environmental noise level
should be used.
250
500
1000
2000
23,0
32,1
36,2
35,1
3,2
2,8
3,0
2,4
250
500
1000
2000
25,9
35,2
37,0
34,9
3,2
3,3
2,9
2,5
250
500
1000
2000
24,3
33,6
35,5
34,1
3,3
3,8
1,7
2,6
ANSI S3.19-1974
3150
4000
6300
8000
39,0
38,7
38,3
36,5
3,8
3,0
3,5
3,9
ANSI S3.19-1974
3150
4000
6300
8000
40,6
39,9
39,7
39,7
3,6
3,0
2,3
2,5
ANSI S3.19-1974
3150
4000
6300
8000
38,5
38,0
35,8
35,7
3,6
3,1
5,4
5,4
EN
NRR
25
NRR
26
NRR
25
5
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