Mitsubishi PLH-P1.6KAH Technical & Service Manual page 35

6. NOISE CRITERION CURVES
PLH-P1.6KAH.UK
PLH-P1.6KAH .UK
1
PLH-P2KAH.UK
PLH-P2KAH .UK
1
90
80
70
60
50
40
30
APPROXIMATE
20
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
10
63 125 250
BAND CENTER FREQUENCIES, Hz
CEILING
SPL(dB)
NOTCH
High 37
Medium1 35.5
Medium2 34
Low 32
500 1000 2000 4000 8000
UNIT
1.5m
MICROPHONE
PLH-P2.5KAH.UK
LINE
PLH-P2.5KAH
90
80
70
NC-70
60
NC-60
50
NC-50
40
NC-40
30
NC-30
APPROXIMATE
20
THRESHOLD OF
HEARING FOR
NC-20
CONTINUOUS
NOISE
10
63
Ambient temperature 27:
Test conditions are based on JIS Z8731
35
NOTCH
High
.UK
1
Medium1
Medium2
Low
125 250 500 1000 2000
BAND CENTER FREQUENCIES, Hz
SPL(dB) LINE
39.5
38
36.5
35
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
4000 8000