22
HWE1305A
SOUND PRESSURE LEVELS
Octa
ve band pressure le
vel (dB) 0dB=20µP
a
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
63
125
250
500
1k
2k
4k
8k
NC-60
NC-50
Approximate minimum
audible limit on
continuous noise
NC-40
Octave band center frequencies (Hz)
NC-20
NC-30
High
Middle
Low
PEY-P36, 42, 48JA(L)(T)
(External static pressure 35Pa)
Octa
ve band pressure le
vel (dB) 0dB=20µP
a
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
63
125
250
500
1k
2k
4k
8k
NC-60
NC-50
Approximate minimum
audible limit on
continuous noise
NC-40
Octave band center frequencies (Hz)
NC-20
NC-30
High
Middle
Low
PEY-P36, 42, 48JA(L)(T)
(External static pressure 50Pa)
Octa
ve band pressure le
vel (dB) 0dB=20µP
a
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
63
125
250
500
1k
2k
4k
8k
NC-60
NC-50
Approximate minimum
audible limit on
continuous noise
NC-40
Octave band center frequencies (Hz)
NC-20
NC-30
High
Middle
Low
PEY-P36, 42, 48JA(L)(T)
(External static pressure 70Pa)
Octa
ve band pressure le
vel (dB) 0dB=20µP
a
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
63
125
250
500
1k
2k
4k
8k
NC-60
NC-50
Approximate minimum
audible limit on
continuous noise
NC-40
Octave band center frequencies (Hz)
NC-20
NC-30
High
Middle
Low
PEY-P36, 42, 48JA(L)(T)
(External static pressure 100Pa)
Octa
ve band pressure le
vel (dB) 0dB=20µP
a
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
63
125
250
500
1k
2k
4k
8k
NC-60
NC-50
Approximate minimum
audible limit on
continuous noise
NC-40
Octave band center frequencies (Hz)
NC-20
NC-30
High
Middle
Low
PEY-P36, 42, 48JA(L)(T)
(External static pressure 125Pa)
