6-1
SOUND LEVEL CHARACTERISTICS
SM PNXGC 1-A.1 GB
6.
SOUND LEVEL CHARACTERISTICS
6.1
Sound Pressure Level
6.2
Sound Pressure Level Spectrum
(Measured as Figure 1)
BAND CENTER FREQUENCIES, Hz
A
PPRO
X
IM
A
TE
THRE
S
HOLD OF
HE
A
RING FOR
CONTINUOU
S
NOI
S
E
NC-70
NC-60
NC-50
NC-40
NC-
3
0
NC-20
OCT
A
VE
BAND
SOUND
PRESSURE
LEVEL,
dB
re
0.002
MICRO
BAR
FAN SPEED
LINE
HI
ME
LO
1m
0.8m
Mic.
Unit
Wall
Hz, AND CE TER FREQUENC ES
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
-70NC
-60NC
-50NC
-40NC
-30NC
-20NC
MICRO
AR0.
02 dB re , OCT
VE BAN
S
UN
PRES
URE L
VEL
Hz, AND CE TER FREQUENC ES
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
-70NC
-60NC
-50NC
-40NC
-30NC
-20NC
MICRO
AR0.
02 dB re , OCT
VE BAN
S
UN
PRES
URE L
VEL
PNX 18
PNX 21
PNX 9
PNX 12
Figure 1
BAND CENTER FREQUENCIES, Hz
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-70
NC-60
NC-50
NC-40
NC-
3
0
NC-20
OCT
A
VE
BAND
SOUND
PRESSURE
LEVEL,
dB
re
0.002
MICRO
BAR
CONTENTS
