3
DATA
3-1. NOISE CRITERION CURVES
PUHZ-W85VHA
90
80
70
60
50
40
30
20
10
MICROPHONE
1m
1.5m
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
63
125
BAND CENTER FREQUENCIES, Hz
UNIT
GROUND
MODE
COOLING
250
500
1000
5
SPL(dB)
LINE
48
48
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
2000
4000
8000