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BRUEL & KJAER 2204 - 2 Sound Level Meter

BRUEL & KJAER 2204
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2.
8 & K Sound Level
Meter
Type 2203
Sound
Level Meters.
Sound
level
meters
are
required
to
measure
noise
of
different
levels,
spectra
and
waveforms
~mde
·
r
widely
varying
conditions
of
sound
source
distribution
and
reflections
at
the
sound
field
boundaries.
Usually
the
purpose
of
these
measurements,
whether
they
are
estimating
hearing
damage
risk,
annoyance,
acoustical
insulation
efficiency,
acceptability
of
manufactured
products
or
any
other
factor,
is
to
collect
data
which
will
improve
our
understanding
of
the
problem
and
also
help
in
solving
it.
Obviously
an
instrument
giving
readings
that
can
be
related
to
subjective
impressions
of
loudness
would
be
desirable.
Attempts
have
been
made
in
the
past
to
design
such
an
instrument,
but
in
view
of
the
difficulties
involved
in
simulating
the
human
hearing
system
for
all
types
of
noise,
the
Inter-
national
Electrotechnical
Commission
(IEC),
has
decided
that
the
most
practical
solution
is
simply
to
standardize
an
apparatus
by
which
sound
pressure
can
be
measured
unde
.r
closely
defined
conditions,
so
that
results
obtained
by
different
users
can
be
compared.
The
Type
2203
Sound
Level
Meter
is
an
instrument
with
a
practical
com-
bination
of
characteristics
that
will
achieve
a
high
degree
of
stability
and
accuracy.
The
accuracy
and
validity
of
the
results
are,
however,
determined
by
the
manner
of
use,
which
must
be
chosen
to
suit
the
situation.
In
particular,
care
must
be
taken
so
that
the
presence
of
the
observe
·r '
does
not
invalidate
the
calibration.
The
instrument
is
not
intended
for
measuring
sounds
of
very
short
duration
or
discontinuous
sounds.
Some
of
the
main
requirements
in
the
IEC
specification
are
quoted
here:
A
precision
sound
level
meter
shall
include
at
least
one
of
the
three
weighting
networks
called
A,
B
or
C,
and
should
cover
the
frequency
range
20
to
20ooo
Hz
within
certain
tolerances.
(Table
5.6).
The
microphone
shall
be
of
the
omnidirectional
pressure
type.
Per-
missible
tolerances
·
on
the
variation
of
sensitivity
with
angle
are
given
in
Table
2.1,
and
it
is
suggested
that
the
diffuse
sound
field
sensitivity
(i.e.
the
root-mean-square
of
the
sensitivities
for
all
orientations)
should
by
some
means
be
brought
within
the
tolerances
already
mentioned
for
the
specified incidence.
A
square
law
indication
instrument
is
specified,
i.e.
it
must
be
capable
of
correctly
summing
two
pure
tones
according
to
the
root-mean-square
law.
The
Precision
Sound
Level
Meter
Type
2203 is a
highly
accurate
instrument
designed
for
outdoor
use
as
well
as
for
precise
laboratory
measurements.
It
11

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