Mitsubishi Electric PUHZ-P200YKA3 Service Manual page 9

5-4. NOISE CRITERION CURVES
PUHZ-P200YKA3.UK
90
80
70
60
50
40
30
APPROXIMATE
20
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
10
63 125 250
BAND CENTER FREQUENCIES, Hz
OCH679
MICROPHONE
1.5 m
MODE SPL(dB)
LINE
COOLING 58
HEATING 60
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
500 1000 2000 4000 8000
1 m
PUHZ-P250YKA3.UK
90
80
70
60
50
40
30
APPROXIMATE
20
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
10
63 125
BAND CENTER FREQUENCIES, Hz
9
UNIT
GROUND
MODE SPL(dB)
COOLING 59
HEATING 62
250 500 1000 2000 4000
LINE
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
8000