8
OCH670
4-3. NOISE CRITERION CURVES
1.5m
1m
MICROPHONE
UNIT
GROUND
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
90
80
70
60
50
40
30
20
10
63
125
250
500
1000 2000 4000 8000
BAND CENTER FREQUENCIES, Hz
OCT
AVE BAND SOUND PRESSURE LEVEL, dB re 0.002 MICRO BAR
COOLING
HEATING
MODE
54
56
SPL(dB)
LINE
90
80
70
60
50
40
30
20
10
63
125
250
500
1000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
BAND CENTER FREQUENCIES, Hz
OCT
AVE BAND SOUND PRESSURE LEVEL, dB re 0.002 MICRO BAR
COOLING
HEATING
MODE
56
57
SPL(dB)
LINE
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
90
80
70
60
50
40
30
20
10
63
125
250
500
1000 2000 4000 8000
BAND CENTER FREQUENCIES, Hz
OCT
AVE BAND SOUND PRESSURE LEVEL, dB re 0.002 MICRO BAR
COOLING
HEATING
MODE
51
54
SPL(dB)
LINE
PUHZ-P100VKA.TH(-ET/-ER)
PUHZ-P100YKA.TH(-ET/-ER)
PUHZ-P125VKA.TH(-ET/-ER)
PUHZ-P125YKA.TH(-ET/-ER)
PUHZ-P140VKA.TH(-ET/-ER)
PUHZ-P140YKA.TH(-ET/-ER)
