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C:A - Headband with foam cushion - ANZ
AZ/NZS 1270:2002
MT74H52A-110
C:1 Frequency (Hz)
125 250 500 1000 2000 4000 8000 SLC
80
Class Clamping
force (N)
MT74H52A-110
292 g
C:2 Mean attenuation (dB)
19.7 19.8 29.0 38.0 35.0 34.2 37.4
31
5
C:3 Standard deviation (dB)
2.9 2.7 2.7 2.7 2.8
2.3
4.1
10.7
C:4 Mean minus SD
16.8 17.1 26.3 35.3 32.2 31.9 33.3
MT74H52A-111
C:1 Frequency (Hz)
125 250 500 1000 2000 4000 8000 SLC
80
Class Clamping
force (N)
MT74H52A-111
300 g
C:2 Mean attenuation (dB)
19.7 19.8 29.0 38.0 35.0 34.2 37.4
31
5
C:3 Standard deviation (dB)
2.9 2.7 2.7 2.7 2.8
2.3
4.1
10.7
C:4 Mean minus SD
16.8 17.1 26.3 35.3 32.2 31.9 33.3
HT52A-112, HT52A-112-50
C:1 Frequency (Hz)
125 250 500 1000 2000 4000 8000 SLC
80
Class Clamping
force (N)
HT52A-112
273 g
C:2 Mean attenuation (dB)
19.7 19.8 29.0 38.0 35.0 34.2 37.4
31
5
C:3 Standard deviation (dB)
2.9 2.7 2.7 2.7 2.8
2.3
4.1
10.7
HT52A-112-50
275 g
C:4 Mean minus SD
16.8 17.1 26.3 35.3 32.2 31.9 33.3
C:B - Hard hat attachment with foam cushion - ANZ AZ/NZS 1270:2002
MT74H52P3E-110
C:1 Frequency (Hz)
125 250 500 1000 2000 4000 8000 SLC
80
Class Clamping
force (N)
MT74H52P3E-110
243 g
C:2 Mean attenuation (dB)
17.8 19.8 28.5 33.9 34.0 32.7 36.2
29
5
C:3 Standard deviation (dB)
4.0 3.8 3.7 3.5 3.6
3.1
4.3
9.6
C:4 Mean minus SD
13.8 16.0 24.8 30.4 30.4 29.6 31.9
MT74H52P3E-111
C:1 Frequency (Hz)
125 250 500 1000 2000 4000 8000 SLC
80
Class Clamping
force (N)
MT74H52P3E-111
251 g
C:2 Mean attenuation (dB)
17.8 19.8 28.5 33.9 34.0 32.7 36.2
29
5
C:3 Standard deviation (dB)
4.0 3.8 3.7 3.5 3.6
3.1
4.3
9.6
C:4 Mean minus SD
13.8 16.0 24.8 30.4 30.4 29.6 31.9
HT52P3E-112, HT52P3E-112-50
C:1 Frequency (Hz)
125 250 500 1000 2000 4000 8000 SLC
80
Class Clamping
force (N)
HT52P3E-112
224 g
C:2 Mean attenuation (dB)
17.8 19.8 28.5 33.9 34.0 32.7 36.2
29
5
C:3 Standard deviation (dB)
4.0 3.8 3.7 3.5 3.6
3.1
4.3
9.6
HT52P3E-112-50
226 g
C:4 Mean minus SD
13.8 16.0 24.8 30.4 30.4 29.6 31.9
C:C - Neckband with foam cushion - ANZ AZ/NZS 1270:2002
MT74H52B-110
C:1 Frequency (Hz)
125 250 500 1000 2000 4000 8000 SLC
80
Class Clamping
force (N)
MT74H52B-110
275 g
C:2 Mean attenuation (dB)
18.4 18.9 27.7 35.1 36.9 34.7 37.2
30
5
C:3 Standard deviation (dB)
3.6 3.3 3.4 2.9 2.7 3.6
3.3
12
C:4 Mean minus SD
14.8 15.6 24.3 32.2 34.2 31.1 33.9
MT74H52B-111
C:1 Frequency (Hz)
125 250 500 1000 2000 4000 8000 SLC
80
Class Clamping
force (N)
MT74H52B-111
282 g
C:2 Mean attenuation (dB)
18.4 18.9 27.7 35.1 36.9 34.7 37.2
30
5
C:3 Standard deviation (dB)
3.6 3.3 3.4 2.9 2.7
3.6
3.3
12
C:4 Mean minus SD
14.8 15.6 24.3 32.2 34.2 31.1 33.9
HT52B-112
C:1 Frequency (Hz)
125 250 500 1000 2000 4000 8000 SLC
80
Class Clamping
force (N)
HT52B-112*
256 g
C:2 Mean attenuation (dB)
18.4 18.9 27.7 35.1 36.9 34.7 37.2
30
5
C:3 Standard deviation (dB)
3.6 3.3 3.4 2.9 2.7
3.6
3.3
12
C:4 Mean minus SD
14.8 15.6 24.3 32.2 34.2 31.1 33.9