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BRUEL & KJAER 4220 User Manual

BRUEL & KJAER 4220
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pressure
level
limit
the
use
of
this
type
of
pistonphone
to
laboratory
work
and
demonstrations.
The
Pistonphoue
Type
4220 is a
mechanical
device
of
a
new
design
which.
by
using
two
symmetrically
mounted
pistons,
with
a
floating
retaining
spring
arrangement,
eliminates
shaft
eccentricity,
and
back
-
lash
of
bearings
from
any
influence
on
the
stroke
of
the
pistons,
and
thus
avoids
the
drawbacks
of
the
old
pistonphone.
This
small
unit
produces
a
pure
tone
of
250 Hz,
with
a
sound
pressure
level
of
124 dB (RMS) re. 2 X 10-4 .ubar,
allowing
correct
calibration
to
be
made
even
in
very
noisy
surroundings.
The
Pistonphone
4220
features
outstanding
simplicity
and
rapidity
of
operation
and
has
a
calibration
accuracy
of
± o.2 dB,
which
is
of
the
same
order
as
the
precision
usually
obtained
by
the
reciprocity
method.
It
can
be
used
anywhere
where
a well-
defined
sound
source
is
required,
and
is especially
suited
for
the
direct
calibration
of
precision
sound
measuring
equipment
in
the
field.
6

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BRUEL & KJAER 4220 Specifications

General IconGeneral
BrandBRUEL & KJAER
Model4220
CategoryMeasuring Instruments
LanguageEnglish

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