17
20
30
40
50
60
80
70
AU282FHERA
1252 50 500 1000 2000 4000 800063
NC-20
NC-30
NC-40
NC-50
NC-60
NC-70
Octave band center frequency
Octave band sound pressure level
dB
Limit of audible
continuous
noise
20
30
40
50
60
80
70
AU482FIERA(G)
63 1252 50 500 1000 2000 4000 8000
NC-20
NC-30
NC-40
NC-50
NC-60
NC-70
Octave band center frequency (Hz)
Octave band sound pressure level
dB
Limit of audible
continuous
noise
20
30
40
50
60
80
70
00010 0020 0040 008365 210 520 05
NC-20
NC-30
NC-40
NC-50
NC-60
NC-70
20
30
40
50
60
80
70
00010 0020 0040 008365 210 520 05
NC-20
NC-30
NC-40
NC-50
NC-60
NC-70
Octave band center frequency
Octave band center frequency
Octave band sound pressure level dB
Octave band sound pressure level
dB