Mitsubishi PLH-P1.6KAH - 6. NOISE CRITERION CURVES

35
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 µbar)
BAND CENTER FREQUENCIES, Hz
PLH-P1.6KAH.UK
PLH-P1.6KAH
1.UK
PLH-P2KAH.UK
PLH-P2KAH
1.UK
High
NOTCH
Medium1
Medium2
Low
37
SPL(dB)
35.5
34
32
LINE
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 µbar)
BAND CENTER FREQUENCIES, Hz
PLH-P2.5KAH.UK
PLH-P2.5KAH
1.UK
High
NOTCH
Medium1
Medium2
Low
39.5
SPL(dB)
38
36.5
35
LINE
6. NOISE CRITERION CURVES
Ambient temperature 27:
Test conditions are based on JIS Z8731
UNIT
1.5m
MICROPHONE
CEILING
OC235B---2.qxp 04.9.29 3:23 PM Page 35