Mitsubishi PU12EK Technical & Service Manual page 7

3. NOISE CRITERION CURVES
PU12EK
90
80
70
60
50
40
30
APPROXIMATE
20
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
10
63 125 250
BAND CENTER FREQUENCIES, Hz
PU24EK PU30EK
PU24EK PU30EK
1
PU24EK PU30EK
2
PU24EK PU30EK
3
90
80
70
60
50
40
30
APPROXIMATE
20
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
10
63 125 250
BAND CENTER FREQUENCIES, Hz
SPL(dB)
50
500 1000 2000 4000
1
2
SPL(dB)
55
3
500 1000 2000 4000
PU18EK
LINE
PU18EK
1
90
80
70
NC-70
60
NC-60
50
NC-50
40
NC-40
30
NC-30
APPROXIMATE
20
THRESHOLD OF
HEARING FOR
NC-20
CONTINUOUS
NOISE
10
63
8000
PU36EK
PU36EK
1
PU36EK
2
LINE
PU36EK
3
90
80
70
NC-70
60
NC-60
50
NC-50
40
NC-40
30
NC-30
APPROXIMATE
20
THRESHOLD OF
HEARING FOR
NC-20
CONTINUOUS
NOISE
10
8000 63
7
125 250 500 1000 2000
BAND CENTER FREQUENCIES, Hz
125 250 500 1000 2000
BAND CENTER FREQUENCIES, Hz
SPL(dB) LINE
53
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
4000 8000
SPL(dB)
LINE
55
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
4000 8000