Etymotic Research ER125-HD15BN Users Manual

English

User Manual

®

!

Caution

Failure to follow these recommendations may severely
reduce the amount of hearing protection provided by
the earplugs.

• Earplugs comply with EN-352 standard of measurement.

• At very high SPLs (above 125 dB SPL, where the limit to
attenuation is the eartip itself), the foam eartips provide
the most protection.

• Eartips fit ear canal diameters of 6-13 mm. See Eartip
section for details.

• The following applies when the device is turned off
or the battery is drained:

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.

Example

1. The environmental noise level as measured at the ear

is 92 dBA.

2. The NRR is 25 decibels (dB).

3. The level of noise entering the ear is approximately

equal to 67 dBA.

Caution: For noise environments dominated by

frequencies below 500 Hz the C-weighted environ­mental noise level should be used. Although hearing
protectors can be recommended for protection against
the harmful effects of impulsive noise, the Noise
Reduction Rating (NRR) is based on the attenuation of

continuous

noise and may not be an accurate indicator

2

!

Caution (continued)

of the protection attainable against
such as gunfire.

• Earplugs must be fitted, adjusted and maintained to
the manufacturer’s instructions to achieve the expected
attenuation and hearing protection.

• Use earplugs at all times in noisy surroundings.

• Make certain that the earplugs provide adequate
protection for the noisy environment.

• Earplugs are reusable. Regularly inspect the earplugs
to assure their continued serviceability.

• Connecting cord should not be used where there
is a risk that the connecting cord can be caught up
during use.

• This product may be adversely affected by certain
chemical substances. Further information should
be sought from the manufacturer.

• This earplug is provided with level-dependent
attenuation. The wearer should check correct
operation before use. If distortion or failure
is detected, the wearer should refer to the
manufacturer’s advice for maintenance and
replacement of the battery.

Warning: The output of the level-dependent

circuit of the hearing protector may exceed the
daily limit sound level.

• To determine if the device is working, insert a battery,
cup the device in your hand and listen for acoustic
feedback (squeal). If feedback is present, the battery
is working.

impulsive

3

noise

Identication

Eartip

Flexible

Neck Cord

Cleaning Tool

2-Position
Switch

Filter Tool and

Extra ACCU•Filters

4

Protective Case

™

Battery
Door

#10

Batteries