3M WORKTUNES WIRELESS Посібник - Сторінка 9

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noIse reDuCtIon rAtInG

The Environmental Protection Agency (EPA) has selected the Noise Reduction Rating

(NRR) as the measure of a hearing protector's noise-reducing capabilities. 3M makes

no warranties as to the suitability of the NRR as a measure of actual protection from

any noise level since such protection depends on the sound level (loudness), how long

you listen to the loud sound and how well you fit the earmuff over your ears. Although

hearing protectors can be recommended for protection against harmful effects of

impulse noise, the NRR is based on the attenuation of continuous noise and may not be

an accurate indicator of the protection attainable against impulse noise such as gunfire.

The NRR for the Worktunes

Wireless is 24 dB(A). Improper fit of this

™

device will reduce its effectiveness in attenuating noise. Consult the

enclosed instructions for proper fit.

The level of noise entering a person's ear when a hearing protector is

worn as directed is closely approximated by the difference between

the A-weighted environmental noise level and the NRR.

Attenuation (ANSI S3.19 – 1974)

Test Frequency (Hz)

125

250

500

1000 2000 3150 4000 6300 8000

Mean Attenuation (dB)

20.3

21.6

30.4

35.7

33.1

36.4

38.9

Standard Deviation

3.5

2.7

3.2

3.1

3.0

3.6

3.9

noIse reDuCtIon rAtInG

(nrr)

EXAMPLE

1. The environmental noise level as measured at the ear is 92 decibels (dBA).

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.

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 1 V.

WARRANTY

NRR

The Worktunes

Wireless is warranted to be free of defects in material and

™

37.3

36.4

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

3.4

3.6

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.

Worktunes

Wireless

™