Sound Pressure Level - Haier AB072MRERA Service Manual

9.8 Sound pressure level

Slim duct type running noise
(1) Testing illustrate:
The auxiliary air duct
Outlet side
Note:
The length of the auxiliary air duct is 2m
(2) Testing condition:
a. Unit running in the standard 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:
AD052MSERA(D)
70
60
50
40
30
20
Limit of
audible
continuous
10
noise
63 125 250 500 1000 2000 4000 8000
Octave band center frequency (HZ)
Unit
Testing position just below the central of the unit
219
The auxiliary air duct
Sound level meter
AD072/092MSERA(D)
70
60
50
40
30
20
Limit of
audible
continuous
10
noise
63 125 250 500 1000 2000 4000 8000
Octave band center frequency (HZ)
Air