Product Warranty

3M
™
WorkTunes
™
Hearing Protector User Guide 19
Hearing Conservation
Example
1. The environmental noise level as measure
at the ear is 92 decibels
2. The NRR is 24 decibels
3. The level of noise entering the ear is
approximately equal to 68 decibels
How else can you tell if you are being
exposed to noises 85 decibels or greater?
Here’s a quick test: If you have to raise your
voice to talk to someone who is an arm’s
length away, you are likely in an environment
with a sound level of 85 decibels or more.
Output Sound Pressure Levels (SPL)
The Sound Pressure Level (SPL) of the
WorkTunes Hearing Protector is limited to
82dB using ordinary music material when
connected to a Personal Music Player
(PMP). If the WorkTunes Hearing Protector
are connected to a PMP or other device
with a very high output level, it is the users
responsibility to set the Sound Pressure Level
to a safe level.
The electrical input level for which the mean
plus one standard deviation A-weighted
diffuse-field related to sound pressure level
for the sixteen ears is equal to 82 dBA is
83 mV.
Caution!
For noisy 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.
Warning!
These hearing protectors help reduce
exposure to hazardous noise and other
loud sounds. Misuse or failure to wear
hearing protectors at all times that you
are exposed to noise may result in
hearing loss or injury. If there is any
drainage from your ear or if you have a
hole in your eardrum, consult with your
physician before wearing hearing
protection. Failure to do so may result
in hearing loss or injury. For proper use,
call 3M Technical Service toll free at
1-800-243-4630.
Attenuation (ANSI S3.19 – 1974)
Test Frequencies in (Hz) 125 250 500 1000 2000 3150 4000 6300 8000 NRR
Mean Attenuation (dB) 16.0 21.4 25.7 35.7 32.0 39.9 40.7 36.0 34.0
24
Standard Deviation (dB) 3.5 3.5 2.4 3.7 3.0 3.0 3.3 4.4 6.1