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
NC-60
NC-50
NC-40
NC-30
NC-70
NC-20
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
SU-2.5NR.TH
Hi
Lo
NOTCH
54
50
SPL(dB)
LINE
<60Hz>
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
NC-60
NC-50
NC-40
NC-30
NC-70
NC-20
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
SU-2.5VR.TH
SU-2.5VR.TH-T
Hi
Lo
NOTCH
53
50
SPL(dB)
LINE
<50Hz>
1m
UNIT
MICROPHONE
Ambient temperature 35
°
C (Cooling) / 7
°
C (Heating)
Test conditions are based on JIS Z8731
OC282-A--1.qxp 03.1.28 4:29 PM Page 9