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BRUEL & KJAER 4220 User Manual

BRUEL & KJAER 4220
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Description
General.
The
Pistonphone
Type
4220 (Fig.
2)
is
of
cylindrical
shape
with
small
dimensions
(comparable
with
the
dimensions
of
a
"flash
light"),
and
is
battery
operated.
It
is
consequently
compact
and
portable,
always
ready
for
use,
having
no
mains
connections,
and
can
be
utilised
under
the
most
difficult
ambient
conditions.
Once
the
microphone
is
fitted
to
the
coupler
the
operation
consists
simply
of
starting
the
pistonphone
and
adjusting
the
sensitivity
of
the
components
in
the
sound
measuring
equipment
until
the
deflection
on
the
indicating
instrument
corresponds
to
the
S.P.L. (RMS
Sound
Pressure
Level)
produced
by
the
pistonphone.
Fig.
2.
P
holograph
of
the
Pistonphone.
Each
pistonphone
is
individually
calibrated
and
the
exact
value
of
calibration,
which
can
deviate
a
few
tenth
of
dB
from
the
nominal
124 dB, is
indicated
on
the
calibration
chart
which
is
supplied
with
the
instrument
upon
delivery.
The
calibration
is given
at
normal
atmospheric
pressure
(760
mm
Hg).
The
maximum
error
of
calibration
is less
than
± o.2 dB.
(66(22
Fig. 9.
Assembly
drawing
of
the
Pistonphone.
6

Table of Contents

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BRUEL & KJAER 4220 Specifications

General IconGeneral
BrandBRUEL & KJAER
Model4220
CategoryMeasuring Instruments
LanguageEnglish

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