3
for disposal of electrical and electronic
equipment.
4. LABORATORY
ATTENUATION
The attenuation rating SNR was obtained
with the device powered off.
4.1. EXPLANATION OF
ATTENUATION TABLES
4.1.1. EUROPEAN STANDARD
EN 352
3M strongly recommends personal fit testing
of hearing protectors. Research suggests
that users may receive less noise reduction
than indicated by the attenuation label
value(s) on the packaging due to variation in
fit, fitting skill, and motivation of the user.
Refer to applicable regulations and guidance
on how to adjust attenuation label value(s).
In the absence of applicable regulations, it is
recommended that the attenuation label
value(s) be reduced to better estimate typical
protection.
EN 352-1
Table
ref.
Description
A:A
Folding headband with
foam cushion
A:1
f = Octave-band centre
frequency (Hz)
A:2
MV = Mean Value (dB)
A:3
SD = Standard Deviation
(dB)
A:4
APV* = MV - SD (dB)
*Assumed protection value
A:5
H = Hearing protection
estimation for high
frequency sounds
(ƒ ≥ 2000Hz).
M = Hearing protection
estimation for medium
frequency sounds
(500 Hz < ƒ < 2000Hz).
L = Hearing protection
estimation for low frequency
sounds (ƒ ≤ 500Hz).
SNR = Single Number
Rating of hearing protector
performance
Table
ref.
Description
A:6
S = Small
M = Medium
L = Large
EN 352-4
Table
ref.
Description
B:A
Criterion levels
B:1
H = Criterion level for
high-frequency noise
M = Criterion level for
medium-frequency noise
L = Criterion level for
low-frequency noise
EN 352-6
Table
ref.
Description
C:A
External electrical safety
related audio input
C:1
Input signal level U (mV
rms
)
C:2
Sound output level (dB(A))
C:3
Criterion input signal (mV)
for which the sound output
level is equal to 82 dB(A)
C:4
Sound output level for
maximum input signal
(dB(A))
C:5
Time equivalent to
82 dB(A) over 8h (hh:mm)
5. OVERVIEW
5.1. D) COMPONENTS
(Figure D:1 - D:12)
D:1
Foldable Headband (stainless
steelsheet, TPE)
D:2
Cup supporting arm (stainless steel)
D:3
Two-point fastener (POM)
D:4
Ear cushion (PVC foil, PUR foam)
D:5
Cup (ABS)
D:6
Shell (ABS)
D:7
Shell lock clip (ABS)
D:8
Microphone for ambient listening
function (PUR foam)
D:9
On/Off button (PUR)
D:10
(+) button (PUR)
D:11
(–) button (PUR)
D:12
External input jack (J22) (TPE)
EN
