2. General information for Offshore Ear Plug EM2140DC-S
and headset AK5850BHS/AK5850BS
used together
a) Sound attenuation (headset and ear plug used in combination)
AK5850BHS Over-the-head headband TwinCom with custom molded earplug
Frequency (Hz)
125
250
500
1000
2000
4000
8000
Mean attenuation(dB)
St.dev. (dB)
APV (84%)
33,4
4,7
28,8
30,0
3,6
26,4
38,6
3,0
35,7
39,3
3,2
36,1
36,2
4,8
31,4
48,5
4,6
43,9
46,4
4,4
42,0
H
84
= 34 dB
M
84
= 34 dB
L
84
= 31 dB
SNR
84
= 36 dB
H
m
= 38,6 dB
M
m
= 37,2 dB
L
m
= 33,6 dB
SNR
m
= 38,9 dB
H
s
= 4,2 dB
M
s
= 3,0 dB
L
s
= 3,0 dB
SNR
s
= 3,2 dB
AK5850BS Helmet attached hearing protector TwinCom with custom moulded earplug
Frequency (Hz)
125
250
500
1000
2000
4000
8000
Mean attenuation(dB)
St.dev. (dB)
APV (84%)
29,9
5,4
24,5
29,5
2,0
27,5
31,9
4,7
27,2
38,6
4,8
33,8
33,9
3,8
30,1
50,7
4,1
46,6
46,1
4,3
41,9
H
84
= 33 dB
M
84
= 32 dB
L
84
= 29 dB
SNR
84
= 34 dB
H
m
= 36,6 dB
M
m
= 33,8 dB
L
m
= 30,8 dB
SNR
m
= 35,9 dB
H
s
= 3,6 dB
M
s
= 2,1 dB
L
s
= 2,1 dB
SNR
s
= 1,9 dB
If you use the ear plug wrong, it may give poor protection and sound quality. Be sure that the Offshore ear plug always is
placed correctly and remember to use the hearing protection at all times in noisy environments.
After a period of 4 years the shape of the inner ear changes and the attenuation can be reduced.
It will then be necessary to renew the offshore ear plug.
b) Auxiliary input (AUX)
Warning:
This equipment has safety related input without limitation for innocousness level.
This equipment shall not be used for entertainment or be connected to other amplifying devises than described in this manual
since the output level is not limited to the necessary innocuousness level.
The dependence between A-weighted equivalent diffuse-field related SPL and input voltage.
Sound Pressure Level
dB(A)
Input Voltage
(mV
ms
)
70
23,5
75
48,0
80
83,7
85
150,6
90
261,5
95
440,3
100
788,7
105
1375,7
110
2433,0
115
4749,6
118
8732,1
The usage time for maximum input voltage that corresponds to an A-weighted equivalent diffuse-field related SPL of 82 dB(A)
over 8 h is 7 seconds at 8732,1 mV
rms
.
The A-weighted diffuse-field related SPL for the maximum input voltage is 118 dB(A) at 8732.1 MV
rms
.
Criterion voltage when A-weighted diffuse-field related sound pressure level is equal to 82 dB(A) is 66 mV
rms
.
Do not connect or disconnect the equipment or turn on/off the radio while the equipment is placed into/over the ears.
Be careful with the volume control! If distortion or failure is detected, the user should refer to the manufacturers advice for
maintenance.
Warning:
The electrical audio output of this hearing protector may exceed the daily limit sound level.
Summary of Contents for EM2140DC-S
Page 1: ...TwinCom User Information...