Airwell YBZ214, Service Manual

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SOUND LEVEL CHARACTERISTICS
Service Manual – YBZ DCI 1-A.1 GB 7-1
7. SOUND LEVEL CHARACTERISTICS
7.1 Sound Pressure Level
7.2 Sound Pressure Level Spectrum (Measured as Figure 1)
HZD009,HYD009 Cooling HZD009,HYD009 Heating
Noise spectrum & NC Curves
NC15
NC20
NC25
NC30
NC35
NC40
NC45
NC50
NC55
NC60
NC65
0
10
20
30
40
50
60
70
80
90
63 125 250 500 1000 2000 4000 8000
Octave Band Center Frequencies [Hz]
O
c
ta
v
e
Ba
nd S
ound
P
ressu
re L
eve
l [d
B
r
e 20 mPa
]
Noise spectrum & NC Curves
NC15
NC20
NC25
NC30
NC35
NC40
NC45
NC50
NC55
NC60
NC65
0
10
20
30
40
50
60
70
80
90
63 125 250 500 1000 2000 4000 8000
Octave Band Center Frequencies [Hz]
O
c
ta
v
e
Ba
nd S
ound
P
re
s
s
ure
Le
v
e
l [
dB re
2
0
m
P
a
]
FAN SPEED LINE
HI
ME
LO