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Hitachi RAM-40QH5 Service Manual page 19

Technical information
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SOUND PRESSURE LEVEL
MODEL : RAM-40QH5 (Heating)
90
80
70
60
50
40
30
20
10
APPROXIMATE
THRESHOLD HEARING
FOR CONTINUROUS
NOISE
63
125
250
Octave band Main wavelength [Hz]
500
1000
2000
– 18 –
4000
8000
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