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BRUEL & KJAER 2204 - Page 65

BRUEL & KJAER 2204
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Filter
Set
Level
Recorder
DC- Power Supply
-('637/..9
Fig. 9.9.
Set-up
for
the
recording
of
noise
spectrograms
.
tl1e
Filter
Set
switching
mechanism
are
supplied
by
the
Level
Recorder
remote
control
socket,
pins
1
and
2.
These
should
be
connected
to
pins
1
and
2
of
the
Filter
Set
remote
control
socket
at
the
back
of
the
instrument.
The
external
DC
supply
required
by
the
Filter
Set
when
used
with
the
Sound
Level
Meter
can
also
be
supplied
by
the
Level
Recorder.
Pin
6
of
the
Level
Recorder
remote
control
socket
should
then
be
connected
to
pin
5
of
the
Filter
Set
remote
control
socket.
Fig. 9.9 is a
sketch
of
a
set-up
for
obtaining
the
octave
and
1/3
octave
spectrograms
of
the
noise
produced
by
a
lathe,
and
Fig.
9.10
gives
an
example
of
the
data
obtained
from
such
a
test
.
.
ODOODDDDOOO
D D
DDDO
O D
DDD
DD
D
DD
D
DDDDDDDDDDDD
D
DDDDDDOOOO
B
rll~!.!,!i
e~tr
...
!i0
25
Nor'S
e
"fr.;rn-
...
a Lathe "
dB above
2 x
1Q-lu
bar
z..
,~
_
I.
Od6
.
,.
,,
.J
.Q
_
20
10
L '""'"1.!!_'"'- ...,_l__
••
,
__2_0_o...
,!..=1.::
.6
J" '
w.
_
..,.liQ_..,._
B.E.
B.
~oo,
RM.s
.
....
,.
....
L,
,
10
OP
0123
10
100
1 20000 cl•
100
1000
10000
Hz
(~n/2m)
.
A
Fig. 9.10 Spectrogram
of
the
noise
produced
by
a lathe.
,
,.
"
/61
82¥
63

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