Sound Pressure Level - Hitachi RAM-55QH5 Service Manual

SOUND PRESSURE LEVEL

MODEL : RAM-55QH5 / RAM-65QH5 (Heating)
90
80
70
60
50
40
30
20
APPROXIMATE
THRESHOLD
FOR CONTINUROUS
NOISE
10
63
HEARING
125 250
O c t a v e b a n d
500 1000
M a i n w a v e l e n g t h
– 31 –
2000 4000
[ H z ]
8000