Sound Level Check Point - Fujitsu ARU24RGLX Design & Technical Manual

¢ Model: ARU48RGLX
 Cooling
80
70
60
50
40
30
20
QUIET
10
0
63 125 250
Octave band center frequency, Hz

6-2. Sound level check point

Microphone
Front view
6-1. Noise level curve
NC-65
NC-60
NC-55
NC-50
HIGH NC-45
NC-40
NC-35
NC-30
NC-25
NC-20
NC-15
500 1,000 2,000 4,000 8,000
Measuring duct
 Heating
80
70
60
50
40
30
20
10
0
63 125
Octave band center frequency, Hz
6 ft. 6-3/4 in. (2 m)
Side view
- 50 -
HIGH
QUIET
250 500 1,000 2,000 4,000
3 ft. 3-3/8 in. (1 m)
Measuring duct
Microphone
6. Operation noise (sound pressure)
NC-65
NC-60
NC-55
NC-50
NC-45
NC-40
NC-35
NC-30
NC-25
NC-20
NC-15
8,000