Service manual

10
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
OCTAVE BAND SOUND PRESSURE LEVEL, dB ( 0dB = 0.0002 μbar )
BAND CENTER FREQUENCIES, Hz
PCA-RP71HA
PCA-RP71HA#1
NOTCH
High
Low
SPL(dB)
38
34
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
OCTAVE BAND SOUND PRESSURE LEVEL, dB ( 0dB = 0.0002 μbar )
BAND CENTER FREQUENCIES, Hz
PCA-RP125HA
PCA-RP125HA#1
NOTCH
High
Low
SPL(dB)
50
44
LINE
1m
1m
unit
about 1.4m
MICROPHONE
ceiling
NOISE CRITERION CURVES
6
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