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BRUEL & KJAER 2204 - Noise; Vibration

BRUEL & KJAER 2204
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Noise
Measurements.
The
measurement
of
noise
is
the
prime
function
of
the
instrument
and
the
main
reason
for
making
it
portable.
It
is easily
transported
to
the
place
where
measurements
are
to
be
taken,
and
its simplicity
of
operation
makes
it
con-
venient
for
the
layman
to
use
as
well
as
the
trained
engineer.
Most
countries
now
have
regulations
for
how
to
measure noise
and
what
sound
levels
are
allowable
in
each
particular
case,
and
the
user
is
referred
to
these
regulations
for
more
information
before
starting
to
make
measurements,
if
the
results
are
for
official
use. See also
the
chapter
on
"Loudness
Evaluation
and
Noise
Rating"
on
page
7.
Measurement
of
Vibration.
Using a B & K
accelerometer
and
the
Integrator
ZR 0020
instead
of
the
micro
-
phone
converts
the
Sound
Level
Meter
into
a
portable
vibration
meter.
The
accelerometer
can
be
fixed
to
the
specimen,
and
because
of
its
small
size
and
weight
it
will
have
a
negligible
effect
on
the
natural
vibrations
unless
the
specimen
is
very
small.
As
an
example
of
application
let
us
take
the
measure-
ment
of
vibration
on
a
flat
plate
in
order
to
determine
the
way
it
breaks
up
into
a
nodal
pattern.
In
this
case
it
is
convenient
to
use
the
accelerometer
with
a
probe,
see
Fig.
9.1,
and
hold
the
probe
against
the
plate
by
hand.
For
hand-held
operation
the
response
of
the
accelerometer
is
linear
up
to
about
looo
Hz.
If
higher
frequencies
are
expected,
the
accelerometer
should
be
fixed
onto
the
vibrating
body
with
a
screw
or
stuck
on
with
wax.
See Fig. 9.1.
2203
1022
~63727
Fig.
9.2.
Set-up
for
finding
the
frequencu
response
of
a
.t-pole
network.
58

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