Mitsubishi Electric PL12FK1, Service Manual

Page: 16 / 67

OC194-16
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 B
AND SOUND PRESSURE LEVEL,
dB re 0.002 MICR
O B
A
R
BAND CENTER FREQUENCIES, Hz
PL24FK2
1
Hi
NOTCH
Lo
47
SPL(dB)
39
LINE
8. NOISE CRITERION CURVES
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 B
AND SOUND PRESSURE LEVEL,
dB re 0.002 MICR
O B
A
R
BAND CENTER FREQUENCIES, Hz
PL42FK2
1
Hi
NOTCH
Lo
49
SPL(dB)
42
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 B
AND SOUND PRESSURE LEVEL,
dB re 0.002 MICR
O B
A
R
BAND CENTER FREQUENCIES, Hz
PL30FK2
1
PL36FK3
1
Hi
NOTCH
Lo
49
SPL(dB)
41
LINE
UNIT
5ft
MICROPHONE
CEILING
Ambient temperature 80˚F
Test conditions are based on JIS Z8731