Mitsubishi Electric PMFY Series Technical & Service Manual page 15

4-4. NOISE CRITERION CURVES
PMFY-P20VBM-E
PMFY-P20VBM-E
PMFY-P20VBM-E#2
PMFY-P20VBM-ER3
PMFY-P20VBM-ER4
90
80
70
60
50
40
30
20
APPROXIMATE THRESHOLD OF HEARING
FOR CONTINUOUS NOISE
10
63 125 250
BAND CENTER FREQUENCIES, Hz
PMFY-P40VBM-E
PMFY-P40VBM-E
PMFY-P40VBM-E#2
PMFY-P40VBM-ER3
PMFY-P40VBM-ER4
90
80
70
60
50
40
30
20
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
10
63 125 250
BAND CENTER FREQUENCIES, Hz
OC307E
NOTCH SPL(dB)
1
High 35
Medium1 33
30
Medium2
Low 27
500 1000 2000 4000
NOTCH SPL(dB)
1
High 39
Medium1 37
Medium2 35
Low 33
500 1000 2000 4000
PMFY-P25/32VBM-E
PMFY-P25/32VBM-E
LINE
PMFY-P25/32VBM-E#2
PMFY-P25/32VBM-ER3
PMFY-P25/32VBM-ER4
90
80
70
NC-70
60
NC-60
50
NC-50
40
NC-40
30
NC-30
20 APPROXIMATE
THRESHOLD OF
HEARING FOR
NC-20
CONTINUOUS
NOISE
10
63
8000
LINE
CEILING
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
8000
15
NOTCH
1
High
Medium1
Medium2
Low
125 250 500 1000 2000
BAND CENTER FREQUENCIES, Hz
1.5m
MICROPHONE
SPL(dB) LINE
37
36
34
32
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
4000 8000
UNIT