51
Ambient temperature 27
:
Test conditions are based on JIS Z8731
UNIT
1.5m
MICROPHONE
CEILING
PLA-P3AA.UK
PLA-P3AA
1
.UK
PLA-P4AA.UK
PLA-P4AA
1
.UK
PLA-P5AA.UK
PLA-P5AA
1
.UK
PLA-P6AA.UK
PLA-P6AA
1
.UK
NOTCH SPL(dB)
LINE
34
32
30
High
Medium1
Medium2
Low
High
Medium1
Medium2
Low
High
Medium1
Medium2
Low
High
Medium1
Medium2
Low
28
NOTCH
SPL(dB)
LINE
41
39
36
33
NOTCH SPL(dB)
LINE
43
41
38
35
NOTCH
SPL(dB)
LINE
45
43
40
37
90
80
70
60
50
40
30
20
10
63
125
250
500
1000
2000
4000
8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002
µ
bar)
BAND CENTER FREQUENCIES, Hz
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002
µ
bar)
BAND CENTER FREQUENCIES, Hz
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002
µ
bar)
BAND CENTER FREQUENCIES, Hz
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002
µ
bar)
BAND CENTER FREQUENCIES, Hz
90
80
70
60
50
40
30
20
10
63
125
250
500
1000
2000
4000
8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
90
80
70
60
50
40
30
20
10
63
125
250
500
1000
2000
4000
8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
90
80
70
60
50
40
30
20
10
63
125
250
500
1000
2000
4000
8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
6. NOISE CRITERION CURVES
OC241-B-2.qxp 04.9.29 5:17 PM Page 51
