Noise Criterion Curves - Mitsubishi Electric PCA Series Service Manual

5

NOISE CRITERION CURVES

PCA-A24KA7.TH
90
80
70
60
50
40
30
APPROXIMATE
20
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
10
63 125 250 500
BAND CENTER FREQUENCIES, Hz
PCA-A36KA7.TH
90
80
70
60
50
40
30
20 APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
10
63 125 250 500
BAND CENTER FREQUENCIES, Hz
3.3 ft
MICROPHONE
OCH638
NOTCH SPL(dB) LINE
High 40
Medium1 37
Medium2 35
Low 33
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
1000 2000 4000 8000
NOTCH SPL(dB) LINE
High 43
Medium1 41
Medium2 39
Low
37
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
1000 2000 4000 8000
3.3 ft
about 4.62 ft
PCA-A30KA7.TH
90
80
70
60
50
40
30
APPROXIMATE
20
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
10
63 125 250 500
BAND CENTER FREQUENCIES, Hz
PCA-A42KA7.TH
90
80
70
60
50
40
30
APPROXIMATE
20
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
10
63 125 250 500
BAND CENTER FREQUENCIES, Hz
ceiling
Main unit
12
NOTCH SPL(dB) LINE
High 41
Medium1 39
Medium2 37
Low 35
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
1000 2000 4000 8000
NOTCH SPL(dB) LINE
High 45
Medium1 43
Medium2 41
Low
39
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
1000 2000 4000 8000