Service manual

7-1
SOUND LEVEL CHARACTERISTICS
SM DLF 1-A.1 GB
7. SOUND LEVEL CHARACTERISTICS
7.1 Sound Pressure Level
Figure 1
7.2 Soud Pressure Level Spectrum (Measured as Figure 1)
DLF 25 DLF 35
BAND CENTER FREQUENCIES, Hz
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.002 MICRO BAR
NC-10
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
NC-10
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
BAND CENTER FREQUENCIES, Hz
FAN SPEED LINE
HI
ME
LO
1.4m
Mic.
Unit
2m duct in
return air area
2m duct in
supply air area
static
pressure
test point
(2(AB)
1/2
)
CONTENT