3M Peltor LiteCom MT53H7A4600-NA User Manual

4
1 2 3
Frequency [Hz] 125 250 500 1000 2000 3150 4000 6300 8000 NRR CSA
Class
MT7H7A4600-NA
Head band
Mean Attenuation [dB] 17.8 23.0 32.1 36.2 35.1 39.0 38.7 38.3 36.5
25 A
Standard Deviation [dB] 4.4 3.2 2.8 3.0 2.4 3.8 3.0 3.5 3.9
MT7H7B4600-NA
Neck band
Mean Attenuation [dB] 18.9 25.9 35.2 37.0 34.9 40.6 39.9 39.7 39.7
26 A
Standard Deviation [dB] 5.2 3.2 3.3 2.9 2.5 3.6 3.0 2.3 2.5
MT7H7P3E4600-NA
Helmet attachment
Mean Attenuation [dB] 19.4 24.3 33.6 35.5 34.1 38.5 38.0 35.8 35.7
25 A
Standard Deviation [dB] 3.4 3.3 3.8 1.7 2.6 3.6 3.1 5.4 5.4
(K) Attenuation
The NRR calculated from these laboratory-based attenuation data is 25 in the over the head and hard hat attached versions and
26 when worn behind the head.
The NRRs may overestimate the hearing protection provided during typical use due to variation in earmuff t, earmuff tting skill
and motivation of the user. 3M recommends reducing the NRR by 50% for estimating the amount of noise reuction provided.
The level of noise entering a person’s ear. when a 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 dBA.
Caution: For noise environments dominated by frequencies below 500 Hz, the C-weighted environmental noise level
should be used.
Although hearing protectors can be recommended for protection against the harmful effects of impulsive noise, the
noise reduction rating (NRR) is based on the attenuation of continuous noise and may not be an accurate indicator of
the protection attainable against impulsive noise such as gunre.
Improper t of this device will reduce its effectiveness in attenuating noise. Consult the tting instructions for proper t.
ANSI S3.19-1974
1. 67.0 8. 88.5 15. 110.9 22. 141.3 29. 179.9 36. 233.6
2. 71.9 9. 91.5 16. 114.8 23. 146.2 30. 186.2 37. 241.8
3. 74.4 10. 94.8 17. 118.8 24. 151.4 31. 192.8 38. 250.3
4. 77.0 11. 97.4 18. 123.0 25. 156.7 32. 203.5
5. 79.7 12. 100.0 19. 127.3 26. 162.2 33. 210.7
6. 82.5 13. 103.5 20. 131.8 27. 167.9 34. 218.1
7. 85.4 14. 107.2 21. 136.5 28. 173.8 35. 225.7
(I) CTCSS (Continuous Tone Coded Squelch System)
(J)

3M Peltor LiteCom MT53H7A4600-NA Specifications

General

Brand	3M
Model	Peltor LiteCom MT53H7A4600-NA
Category	Headsets
Language	English