Husqvarna HP310-1, Operator'S Manual

Page: 227 / 247

HP310-2
Attenuation tested according to ANSI S3.19-1974
Frequen-
zy (Hz)
125 250 500 1000 2000 3150 4000 6300 8000
Mean at-
tenuation
dB(A)
17.8 17.8 24.6 27.9 35.6 42.1 43.8 41.1 40.3
Standard
deviation
dB(A)
2.9 2.6 2.9 3.1 3.3 3.4 3.7 4.2 3.7
NRR, dB 21
Head-
band
force, lbs
2.2
The level of noise entering a person's ear, when 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 21 decibels (dB).
3. The level of noise entering the ear is approximately
equal to 92 dB(A) - 21 dB(A).
CAUTION: For noise environments
dominated by frequencies below 500 Hz the
C-weighted environmental noise level
should be used.
Improper fit of this device will reduce its effectiveness in
attenuating noise. Consult the enclosed instructions for
proper fit (in example this manual).
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 of the protection attainable against
impulsive noise such as gunfire.
Battery
Type Article number
3.7V
DC
Li-ion Husqvarna: 594 95 62-01
Materials
Part Material Part Material
Inner ear cup ABS Headband POM+TPE
Outer ear cup, left ABS Helmet fork PA66GF30
Outer ear cup, right ABS+TPE Helmet fork spring Steel
Inserts PUR Screws Steel
Sealing rings ABS+TPE
579 - 005 - 05.07.2019
227