Engineering Manual

A-212
CEILING
MICROPHONE
5 ft
UNIT
90
80
70
60
50
40
30
20
10
63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
BAND CENTER FREQUENCIES, Hz
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
SPL(dB) LINE
38
22
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)
SLZ-KA09NA
90
80
70
60
50
40
30
20
10
63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
BAND CENTER FREQUENCIES, Hz
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)
SLZ-KA12NA
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
90
80
70
60
50
40
30
20
10
63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
BAND CENTER FREQUENCIES, Hz
29
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)
SLZ-KA15NA
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
High
Medium
Low
NOTCH
SPL(dB) LINE
39
40
30
High
Medium
Low
NOTCH
SPL(dB) LINE
40
35
31
High
Medium
Low
NOTCH