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BRUEL & KJAER 4131 - Pistonphone 4220

BRUEL & KJAER 4131
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series
of
measurement
by
means
of
a
calibrated
sound
source.
Then
the
errors
(a) (b)
(c)
(d)
outlined
above
are
replaced
by
the
source
calibration
error
and
the
calibrating
reading
error.
When
using
a
Pistonphone
Type
42
·20,
these
errors
may
be
estimated
each
to
o.l
dB.
The
total
standard
error
is
then
reduced
to
S = o.40 dB ( o.27 dB
for
pure
tones,
for
which
error
(g)
may
be
eliminated.
Pistonphone Type 4220.
The
Pistonphone
Type
4220 (Fig. A.l) is a
small,
portable
battery-driven
unit
weighing
only
1.5 lbs.
which
is
extremely
well-suited
for
field
calibration.
The
pistonphone
produce
·s,
when
fitted
to
a B & K
microphone,
a
sound
pressure
level
of
12
'4 dB
at
250 Hz
which
is
known
with
an
error
of
less
than
± o.2 dB.
This
enables
a
direct
calibration
in
dB SL
of
a
meter
scale
to
be
made,
and
measurements
the
·
refore
to
be
taken
with
an
excellent
accuracy
if
the
frequency
response
and
the
dynamic
linearity
(including
the
atrlenu-
ators)
of
the
instrumentation
following
the
microphone
are
ascertained.
A
barometer
is
supplied
with
the
instrument
for
direct
readling
o.f
ambient
pressure
corrections,
together
with
adaptors
for
fitting
to
the
different
B & K
microphones.
Fig.
A.t.
Pistonphone
Type
4220
in
case
with
Barometer
and
Coupling
Adaptors for fitting
to
the
diffeunt
B & K
microphones
.
37

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