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NOISE CRITERIA CURVES
4
MU-GA20VB
MU-GA25VB
90
80
70
60
50
40
30
APPROXIMATE
20
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
10
63
125
250
BAND CENTER FREQUENCIES, Hz
FUNCTION
SPL(dB
)
LINE
(A)
COOL
45
Test conditions,
Cooling : DB27:
WB19:
500
1000
2000
4000
8000
MU-GA35VB
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
63
MICROPHONE
5
FUNCTION
COOL
Test conditions,
Cooling :DB35:
125
250
500
1000
2000
BAND CENTER FREQUENCIES, Hz
OUTDOOR UNIT
1m
SPL(dB
)
LINE
(A)
49
WB24:
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
4000
8000
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