Mitsubishi Electric PKFY Series, Technical & Service Manual, Page: 16 / 38

17 16 17
OCH715
10
20
30
40
50
60
70
80
90
63 125 250 500 1000 2000 4000 8000
Approximate minimum
audible limit on
continuous noise
PKFY-P15NLMU-E
NC-60
NC-50
NC-40
NC-20
NC-30
NC-70
BAND CENTER FREQUENCIES, Hz
OCT
AVE BAND SOUND PRESSURE LEVEL, dB
（
0dB=0.0002μbar)
10
20
30
40
50
60
70
80
90
63 125 250 500 1000 2000 4000 8000
Approximate minimum
audible limit on
continuous noise
PKFY-P18NLMU-E
NC-60
NC-50
NC-40
NC-20
NC-30
NC-70
BAND CENTER FREQUENCIES, Hz
OCT
AVE BAND SOUND PRESSURE LEVEL, dB
（
0dB=0.0002μbar)