Noise Criterion Curves - Mitsubishi Electric PCA-P3HA Technical & Service Manual

5. NOISE CRITERION CURVES

PCA-P3HA
90
80
70
60
50
40
30
APPROXIMATE
20
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
10
63 125 250
BAND CENTER FREQUENCIES, Hz
1m
1m
about 1.4m
MICROPHONE
NOTCH SPL(dB) LINE
Hi 38
Lo 34
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
500 1000 2000 4000 8000
PCA-P5HA
90
80
70
60
50
40
30
APPROXIMATE
20
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
10
63 125
ceiling
unit
20
NOTCH SPL(dB)
Hi
50
Lo 44
250 500 1000 2000 4000
BAND CENTER FREQUENCIES, Hz
LINE
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
8000