9
90
80
70
60
50
40
30
20
10
63
125
250
500
1000
2000
4000
8000
OCT
A
VE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
Test conditions,
Cooling : Dry-bulb temperature 27
:
Wet-bulb temperature 19
:
47
SPL(dB(A))
LINE
High
NOTCH
Heating : Dry-bulb temperature 20
:
Wet-bulb temperature 15.5
:
MSH-30RV-
E1
90
80
70
60
50
40
30
20
10
63
125
250
500
1000
2000
4000
8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
BAND CENTER FREQUENCIES, Hz
Test conditions,
Cooling : Dry-bulb temperature 35
:
Wet-bulb temperature 24
:
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
55
SPL(dB(A))
LINE
High
NOTCH
Heating : Dry-bulb temperature 7
:
Wet-bulb temperature 6
:
OCT
A
VE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
MUH-30RV-
E1
OB272-1.qxp 2/7/01 2:53 PM Page 9
