488
19.8 Sound pressure level
(1) Testing illustrate:
(2) Testing condition:
a. Unit running in the nominal condition.
b. Test in the semi-anechoic chamber.
c. Noise level varies from the actual factors such as room structure, etc.
(3) Octave band level:
1m
1m
AF072/092/122MAERA
Octave band sound pressure level dB
Octave band center frequency (HZ)
Limit of 
audible 
continuous 
noise
63 125
250 500
1000 2000 4000 8000
10
20
30
40
50
60
70
AF052MAERA
AF072/092/122MAERA
Octave band sound pressure level dB
Octave band center frequency (HZ)
Limit of 
audible 
continuous 
noise
63 125
250 500
1000 2000 4000 8000
10
20
30
40
50
60
70
AF072/092/122MAERA
AF182MAERA
Octave band sound pressure level dB
Limit of 
audible 
continuous 
noise
Octave band center frequency (HZ)
63 125
250 500
1000 2000 4000 8000
10
20
30
40
50
60
70
AF182MAERA