4
NOISE CRITERIA CURVES
MCFH-13NV -
E3
90
80
70
60
50
40
30
APPROXIMATE
20
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
10
63
125
250
BAND CENTER FREQUENCIES, Hz
SPL(dB
)
LINE
NOTCH
(A)
Hi
46-47
(220-240V)
Test conditions,
Cooling : DB 27: WB 19:\
Heating : DB 20: WB -
500
1000
2000
4000
MUCFH-13NV -
90
80
70
NC-70
60
NC-60
50
NC-50
40
NC-40
30
NC-30
APPROXIMATE
20
THRESHOLD OF
HEARING FOR
NC-20
CONTINUOUS
NOISE
10
8000
63
5
E3
NOTCH
SPL(dB
Hi
49
(220-240V)
Test conditions,
Cooling : DB 35: WB 24:
Heating : DB 7: WB 6:
125
250
500
1000
2000
BAND CENTER FREQUENCIES, Hz
)
LINE
(A)
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
4000
8000