Noise Criterion Curves - Mitsubishi SEZ-A12AR Technical & Service Manual

NOISE CRITERION CURVES

SEZ-A12AR.TH
90
80
70
60
50
40
30
APPROXIMATE
20
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
10
63 125 250
BAND CENTER FREQUENCIES, Hz
SEZ-A24AR.TH
90
80
70
60
50
40
30
APPROXIMATE
20
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
10
63 125 250
BAND CENTER FREQUENCIES, Hz
NOTE: The sound level is measured in an anechoic room where echoes are few, when compressor stops. The sound
may be bigger than displayed level under actual installation condition by surrounding echoes. The sound level
can be higher by about 2 dB than the displayed level during cooling and heating operation.
<50Hz>
NOTCH LINE
SPL(dB)
Hi 35
Lo 30
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
500 1000 2000 4000 8000
<50Hz>
NOTCH SPL(dB) LINE
Hi 43
Lo
32
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
500 1000 2000 4000 8000
SEZ-A18AR.TH
90
80
70
60
50
40
30
APPROXIMATE
20
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
10
63 125
External static
pressure 30Pa
7
NOTCH SPL(dB)
Hi 39
Lo 31
250 500 1000 2000 4000
BAND CENTER FREQUENCIES, Hz
UNIT
1.5m
MICROPHONE
<50Hz>
LINE
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
8000