Mitsubishi Electric PUHZ-ZRP35VKA2 Service Manual page 9

5-3. NOISE CRITERION CURVES
PUHZ-ZRP35VKA2(-ER/-ET)
PUHZ-ZRP50VKA2(-ER/-ET)
90
80
70
60
50
40
30
20 APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
10
63 125 250
BAND CENTER FREQUENCIES, Hz
MICROPHONE
1 m
1.5 m
OCH635A
SPL(dB)
MODE LINE
COOLING 44
HEATING 46
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
500 1000 2000 4000 8000
UNIT
GROUND
PUHZ-ZRP60VHA2(-ER/-ET)
PUHZ-ZRP71VHA2(-ER/-ET)
90
80
70
60
50
40
30
APPROXIMATE
20
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
10
63 125
BAND CENTER FREQUENCIES, Hz
9
SPL(dB)
MODE
COOLING 47
HEATING 48
250 500 1000 2000 4000
LINE
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
8000