Use And Care Manual

FCC NOTE
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not
installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will
not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the
equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
 Reorient or relocate the receiving antenna.
 Increase the separation between the equipment and receiver.
 Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
 Consult the dealer or an experienced radio/TV technician for help.
Shielded interference cable must be used with the equipment in order to comply with the limits for a digital device pursuant to Subpart B of Part 15 of FCC Rules.
Specifications and designs are subject to change without any notice or obligation on the part of the manufacturer.
Table 3.1: Ear Muff NRR Calculation Worksheet
Table 3.2: Earbud Mean Attenuation Levels
Frequency 125 250 500 1000 2000 3150 4000 6300 8000
Mean Attenuation 7.1 16.0 27.4 37.1 42.1 44.6 43.8 31.7 27.2
Earbud Deviation 1.8 1.1 1.4 2.1 1.7 1.7 2.4 0.2 0.1
1/3 octave
centerband
frequency
Assumed or
Measured
Sound levels
exterior to
Earmuff
C-weighting
response
correction
C-weighted
Sound Levels
Exterior to Ear
Muff or Plug
A-weighting
response
correction
A-weighted
Sound Levels
Exterior to Ear
Muff or Plug
Un-weighted
Attenuated
Levels of Ear
Muff or Plug
Standard
Deviation of
Attenuation
Standard
Deviation of
Attenuation
TIMES 2
Estimated
Projected A-
weighted
Levels inside
Ear Muff or
Plug
125
99.2 -0.2 99.0 -16.1 83.1 7.1 1.8 3.6 79.6
250
92.8 0.0 92.8 -8.6 84.2 16.0 1.1 2.1 70.3
500
93.7 0.0 93.7 -3.2 90.5 27.4 1.4 2.9 65.9
1000
94.9 0.0 94.9 0.0 94.9 37.1 2.1 4.2 62.0
2000
96.1 -0.2 95.9 1.2 97.3 42.1 1.7 3.4 58.5
3150
95.8 -0.5 95.3 1.2 97.0 44.6 1.7
4000
94.6 -0.8 93.8 1.0 95.6 43.8 2.4
4.0
55.8
6300
78.2 -2.0 76.2 -0.1 78.1 31.7 0.2
8000
78.4 -3.0 75.4 -1.1 77.3 27.2 0.1
0.3
50.4
Overall C Level 104.0 Overall A Level 80.3
NRR Calc
Overall C Level 104.0
Overall A Level 80.3
NRR = 20.7