Mitsubishi PKA-RP2.5FAL, Technical & Service Manual

Page: 32 / 56

32
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
OCT
A
VE B
AND SOUND PRESSURE LEVEL,
dB re 0.0002 MICR
O B
AR
BAND CENTER FREQUENCIES, Hz
PKA-RP2.5FAL
PKA-RP3FAL
Hi
Lo
45
SPL(dB)
39
LINE NOTCH
5-6. NOISE CRITERION CURVES
UNIT
WALL
1m
1m
MICROPHONE
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
OCT
A
VE B
AND SOUND PRESSURE LEVEL,
dB re 0.0002 MICR
O B
AR
BAND CENTER FREQUENCIES, Hz
PKA-RP4FAL
Hi
NOTCH
Lo
46
SPL(dB)
41
LINE
OC301B--2.qxp 13.8.20 3:22 PM Page 32
OC301B