6-1
SOUND LEVEL CHARACTERISTICS
SM PNXADCI 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
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.002 MICRO BAR
FAN SPEED LINE
HI
ME
LO
0.8m
Mic.
Unit
Wall
Hz, AND CE TER FREQUENC ES
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
-70NC
-60NC
-50NC
-40NC
-30NC
-20NC
LEVLERUSERPNUSNABEVTCO,erBd20.0RAORCIM
Hz, AND CE TER FREQUENC ES
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
-70NC
-60NC
-50NC
-40NC
-30NC
-20NC
TCO
,erBd20
.0RAOR
CIMLEVLER
USERP
NUSNA
BEV
PNXA 18 PNXA 21
PNXA 9 PNXA 12
Figure 1
BAND CENTER FREQUENCIES, Hz
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.002 MICRO BAR