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BRUEL & KJAER 4220 User Manual

BRUEL & KJAER 4220
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symmetrically
located
with
respect
to
the
cam,
any
mechanical
deviation
due
to
the
mounting
or
to
a
wobbling
of
the
motor
is
compensated
in
the
total
movement
of
the
pistons,
and
has
no
influence
on
the
S.P.L.
produced
.
Retaini
~ g
spring
Fig.
4.
Cross-section
showing
the
principle
of
operation.
The
frontal
surface
AP
of
the
pistons
and
the
volume
V
of
the
cavity
are
also
e
asy
to
measure
accurately,
and
as
the
diameter
of
the
pistons
is
great
with
regard
to
the
stroke
the
influence
of
the
space
between
the
pistons
and
the
walls is negligible.
(The
tightness
of
the
pistons
is
satisfactory,
without
any
lubricating
material,
down
to
about
20 Hz).
Finally
a
possible
error
on
the
ambient
pressure
Po is
far
below
the
required
limit,
as
ten
degrees
on
the
scale
of
the
barometer
corresponds
to
o.04 dB.
These
features
make
it
possible
to
calculate
the
S.P.L.
produced
by
the
Pistonphone
Type
4220
at
the
standard
frequency
of
250 Hz
to
within
less
than±
o.2 dB
(±
2
%).
b sin 4
ot
/<'ig.
5.
Sketch
of
the
sinusoidally shaped cam.
Pistons,
Non-Linear
Distortion.
The
design
of
the
piston
drive
in
the
Pistonphone
4220
makes
an
allowance
for very low
non-linear
distortion.
The
distortion
is
produced,
not
by
imper-
8

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BRUEL & KJAER 4220 Specifications

General IconGeneral
BrandBRUEL & KJAER
Model4220
CategoryMeasuring Instruments
LanguageEnglish

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