Service manual

6
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
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
Test conditions,
Cooling : DB 27: WB 19:\
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
High
SPEED
48
SPL(dB
(A)) LINE
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
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
Test conditions,
Cooling : DB 35: WB (24:)
High
SPEED
53
SPL(dB
(A)) LINE
MCF-24NV -
E3
MUCF-24NV -
E3
OB270--1.qxp 4/13/01 2:59 PM Page 6