Sound Pressure Levels And Nc Curves - Mitsubishi Electric PWFY-P-NMU-E-AU Engineering Manual

7. SOUND PRESSURE LEVELS

7-1. Sound Pressure Levels and NC Curves

Measurement condition
PWFY-P36NMU-E-BU
Measurement
location
Measurement condition
PWFY-P36, 72NMU-E-AU
Measurement
location
PWFY-12 PWFY-P-NMU-E-BU/PWFY-P-NMU-E-AU (Sept. 2010)
3-1/4 ft. (1m)
3-1/4 ft. (1m)
Sound pressure level of PWFY-P36NMU-E-BU
90
80
70
60
50
40
30
20
Approximate minimum
audible limit on
10
continuous noise
0
63 125 250 500
Octave band center frequencies <Hz>
63 125 250 500
60Hz 41.0 53.5 37.0 42.0
Sound pressure level of PWFY-P36, 72NMU-E-AU
90
80
70
60
50
40
30
20
Approximate minimum
audible limit on
10
continuous noise
0
63 125 250 500
Octave band center frequencies <Hz>
63 125 250 500
60Hz 42.0 32.0 33.0 25.0
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
1k 2k 4k 8k
1k 2k 4k 8k dB(A)
39.0 32.0 27.5 27.0 44.0
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
1k 2k 4k 8k
1k 2k 4k 8k dB(A)
22.5 14.5 15.0 12.0 29.0