3M WORKTUNES Connect Mode D'emploi page 18

NOISE REDUCTION RATING (NRR)
The level of noise entering a person
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 decibels dB(A).
2. The NRR is 24 dB(A).
3. The level of noise entering the ear is approximately 68 dB(A).
CAUTION
For noise environments dominated by frequencies below 500 Hz, the C-weighted environmental noise level
should be used. The NRR used in the above example was achieved under laboratory conditions.
AS/NZS 1270:2002
Test Frequency (Hz)
Mean Attenuation (dB) 16.7 19.2 26.2 34.9
Standard Deviation
SLC 27.9 dB Class 5 Clamping Force: 9.8 N Mass: 342 g
80
AUDIO INPUT LEVEL
The audio level in the hearing protector is dependent on the audio input level. To prevent harmful noise
levels, the hearing protector audio level is limited to 82 dB(A) when connected to a Personal Music Player
(PMP). If the hearing protector is connected to a PMP or other device with a very high output level, it is the
user s responsibility to set the audio input level to a safe level. The maximum permitted audio input level for
'
8 hours of usage time, compressed speech and music is 72 mV.
WARRANTY
The Worktunes Connect + AM/FM Hearing Protector is warranted to be free of defects in material and
TM
workmanship for a period of one (1) year from the date of original purchase. 3M will, at its option, repair or
replace without charge, except for transportation costs, parts that fail under normal use and service when
operated and maintained in accordance with our instructions. This warranty does not cover damage caused
by misuse, abuse or unauthorized modifications. Proof of purchase is required to verify eligibility.
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s ear when a hearing protector is worn as directed is closely
'
125 250 500 1000 2000 4000 8000
3.3 3.4 4.0 3.5
30.8 37.2 35.7
2.8 3.3 3.6