Sound Level Characteristics - Electra DELTA 18ST Service Manual

6.

SOUND LEVEL CHARACTERISTICS

6.1 Sound Pressure Level
6.2 Sound Pressure Level Spectrum
DELTA 18
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
BAND CENTER FREQUENCIES, Hz
DELTA 24
SM DELTA 1-E.0 GB
SOUND LEVEL CHARACTERISTICS
Unit
1m
Wall
0.8m
Mic.
Figure 1
(Measured as Figure 1)
NC-70
NC-60
NC-50
NC-40
NC- 0
APPROXIMATE
THRESHOLD OF
HEARING FOR
NC-20
CONTINUOUS
NOISE
CONTENTS
FAN SPEED
HI
ME
LO
DELTA 21
BAND CENTER FREQUENCIES, Hz
LINE
NC-70
NC-60
NC-50
NC-40
NC- 0
NC-20
6-1