Mitsubishi Electric PEAD-M140JA, Service Manual

Page: 21 / 54

21
SOUND PRESSURE LEVELS
5
5-1. Sound pressure level
Measurement location
2m
2m
Aux. duct
1.5m
test unit
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
63 125 250 500 1k 2k 4k 8k
NC-60
NC-50
Approximate minimum
audible limit on
continuous noise
NC-40
Octave band center frequencies (Hz)
NC-20
NC-30
High
Middle Low
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
63 125 250 500 1k 2k 4k 8k
NC-60
NC-50
Approximate minimum
audible limit on
continuous noise
NC-40
Octave band center frequencies (Hz)
NC-20
NC-30
High
Middle Low
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
63 125 250 500 1k 2k 4k 8k
NC-60
NC-50
Approximate minimum
audible limit on
continuous noise
NC-40
Octave band center frequencies (Hz)
NC-20
NC-30
High
Middle Low
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
63 125 250 500 1k 2k 4k 8k
NC-60
NC-50
Approximate minimum
audible limit on
continuous noise
NC-40
Octave band center frequencies (Hz)
NC-20
NC-30
High
Middle Low
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
63 125 250 500 1k 2k 4k 8k
NC-60
NC-50
Approximate minimum
audible limit on
continuous noise
NC-40
Octave band center frequencies (Hz)
NC-20
NC-30
High
Middle Low
(External static pressure 35Pa) (External static pressure 100Pa)
(External static pressure 50Pa)
(External static pressure 70Pa)
(External static pressure 150Pa)
Ceiling concealed
5-2. NC curves
PEAD-M35JA(L)
HWE16130.qxd 17.4.3 13:15 Page 21