3M Peltor MT7H7A4610-NA User Manual page 4

(I) DCS (Digital Coded Squelch)
39. 023 53. 114 67. 174 81. 315 95. 445 109. 631
40. 025 54. 115 68. 205 82. 331 96. 464 110. 632
41. 026 55. 116 69. 223 83. 343 97. 465 111. 654
42. 031 56. 125 70. 226 84. 346 98. 466 112. 662
43. 032 57. 131 71. 243 85. 351 99. 503 113. 664
44. 043 58. 132 72. 244 86. 364 100. 506 114. 703
45. 047 59. 134 73. 245 87. 365 101. 516 115. 712
46. 051 60. 143 74. 251 88. 371 102. 532 116. 723
47. 054 61. 152 75. 261 89. 411 103. 546 117. 731
48. 065 62. 155 76. 263 90. 412 104. 565 118. 732
49. 071 63. 156 77. 265 91. 413 105. 606 119. 734
50. 072 64. 162 78. 271 92. 423 106. 612 120. 743
51. 073 65. 165 79. 306 93. 431 107. 624 121. 754
52. 074 66. 172 80. 311 94. 432 108. 627
(J)
1
(K) Attenuation
Frequency [Hz]
MT7H7A4610-NA Mean Attenuation [dB]
Head band
Standard Deviation [dB]
MT7H7B4610-NA Mean Attenuation [dB]
Neck band
Standard Deviation [dB]
MT7H7P3E4610-NA Mean Attenuation [dB]
Helmet attachment
Standard Deviation [dB]
Testing performed by E-A-RCAL lab first accredited 12/3/91. All data per ANSI S3.19-1974.
The NRR calculated from these laboratory-based attenuation data is 25. Improper fit of this device will reduce its effectiveness in
attenuating noise. Consult the fitting instructions for proper fit.
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 gunfire.
Improper fit of this device will reduce its effectiveness in attenuating noise. Consult the fitting instructions for proper fit.
4
2 3
125 250
17.8 23.0
4.4 3.2
18.9 25.9
5.2 3.2
19.4 24.3
3.4 3.3
500 1000 2000 3150
32.1 36.2 35.1 39.0
2.8 3.0 2.4 3.8
35.2 37.0 34.9 40.6
3.3 2.9 2.5 3.6
33.6 35.5 34.1 38.5
3.8 1.7 2.6 3.6
4000 6300 8000 NRR
38.7 38.3 36.5
25
3.0 3.5 3.9
39.9 39.7 39.7
26
3.0 2.3 2.5
38.0 35.8 35.7
25
3.1 5.4 5.4
CSA
Class
A
A
A