Mitsubishi PMH-P1.6BA, Technical & Service Manual

Page: 18 / 32

18
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
OCT
A
VE BAND SOUND PRESSURE LEVEL, dB re 0.002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
PMH-P1.6BA
Hi
NOTCH
Mi2
Mi1
Lo
40
SPL(dB)
38
36
34
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
OCT
A
VE BAND SOUND PRESSURE LEVEL, dB re 0.002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
PMH-P2BA
Hi
NOTCH
Mi2
Mi1
Lo
42
SPL(dB)
40
38
36
LINE
5-6. NOISE CRITERION CURVES
Ambient temperature 27 :
Test conditions are based on JIS Z8731
UNIT
1.5m
MICROPHONE
CEILING