(B)
Headband (MT53H7A4400-EU)
B:2 Frequency (Hz)
B:3 Mean attenuation (dB)
B:4 Standard deviation (dB)
B:5 APV (dB)
B:6)
APPROX 394 g
Helmet Attached (MT53H7P3E4400-EU)
B:2 Frequency (Hz)
B:3 Mean attenuation (dB)
B:4 Standard deviation (dB)
B:5 APV (dB)
B:6)
APPROX 418 g
Neckband (MT53H7B4400-EU)
B:2 Frequency (Hz)
B:3 Mean attenuation (dB)
B:4 Standard deviation (dB)
B:5 APV (dB)
B:6)
APPROX 384 g
(C)
(C:1) Hard Hat Manufacturer
3M
3M
3M
3M
3M
3M
3M
3M
3M
3M
3M
3M
3M
3M
3M
125
18.1
2.4
15.6
125
18.4
2.8
15.6
125
16.9
3.0
13.9
(C:2) Hard Hat Model
SecureFit Safety Helmet X5000
SecureFit Safety Helmet X5500
Airstream AH1, AH4
Airstream AH7
Airstream HT-701, HT-702, HT-705
Airstream HT-707
G500 Headgear
Versaflo M-106, M-107
Versaflo M-306, M-307
3M™ Speedglas™ Welding Helmet
9100 MP
G2000
G22 (BASIC SET)
G3000
G3501
H-700
250
500
1000
24.3
32.1
36.2
1.7
2.2
2.6
22.6
29.9
33.6
B:7 SNR=32 dB H=33 dB M=30 dB L=23 dB
250
500
1000
24.5
31.9
37.1
1.9
3.1
3.0
22.6
28.8
34.1
B:7 SNR=33 dB H=34 dB M=30 dB L=23 dB
250
500
1000
23.2
32.1
35.2
2.4
2.5
2.1
20.8
29.5
33.1
B:7 SNR=32 dB H=34 dB M=30 dB L=22 dB
(C:3) Attachment
E
E
AE
AE
AE
AE
E
AF
AF
AF
K
E
E
E
E
2000
4000
8000
34.7
39.2
36.0
3.6
3.3
2.4
31.1
35.9
33.6
2000
4000
8000
35.2
39.2
36.0
2.6
2.9
2.8
32.7
36.3
33.2
2000
4000
8000
35.6
38.3
37.4
2.9
3.7
3.2
32.6
34.6
34.3
C:4) Head size: S=small,
M=medium, L=large
SML
SML
ML
ML
ML
ML
SML
ML
ML
ML
SML
ML
SML
SML
L