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BRUEL & KJAER 2305 - Applications

BRUEL & KJAER 2305
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6.
Appl
ications
Spectrograms.
One
of
the
most
important
applications
of
the Level
Recorder
Type
2305
when
combined
with
one
of
the
B & K
analyzers
is
the
automatic
recording
of
spectrograms
on
preprinted
frequency
calibrated
recording
paper.
Some
typical
spectrograms
are
discussed
and
shown
in
the
following.
Sound.
When
the
B & K
Audio
Frequency
Spectrometer
Type
2112
and
one
of
the
B & K
Condenser
Microphones
are
employed
together
with
the
Level
Re·
c
order,
a
measuring
arrangement
is
obtained
for
automatic
recording
of
any
sound
spectrogram
in
bands
of
1/3
or
111
octave
in
the
frequency
range
22--45000
Hz
(cis)
*)
and
with
sound
pressure
levels (S.P.L.)
from
approx.
15
dB
to
160 dB,
reference
2 X 10-
4
;.tbar.
Fig.
6.1
shows
the
measuring
arrangement.
In
this
case
the
Audio
Frequency
Spectrum
Recorder
Type
3315 is used,
which
is a
combined
unit
of
the
Level
H31
0'
4132
•
2612
41330,4134
.2614
161122
Fig.
6.1. Combination
lor
recording
01
sound
spectrograms
in
bands
of
1,3
or
lh
octaves.
0)
By
adding
the
B
&:
K Extension
Filter
Set Type
1620,
the frequency
range
call be enlarged
to
11--45000
Hz
(els).
70

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