Electra DELTA 18, Service Manual

Page: 27 / 110

6-1
SOUND LEVEL CHARACTERISTICS
SM DELTA 1-E.0 GB
6. SOUND LEVEL CHARACTERISTICS
6.1 Sound Pressure Level
6.2 Sound Pressure Level Spectrum
(Measured as Figure 1)
FAN SPEED LINE
HI
ME
LO
1m
0.8m
Mic.
Unit
Wall
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
V
E
BAND
SOUND
PRESSURE
LEVEL,
dB
re
0.002
MICRO
BAR
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
V
E
BAND
SOUND
PRESSURE
LEVEL,
dB
re
0.002
MICRO
BAR
DELTA 24
DELTA 18 DELTA 21
Figure 1