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BRUEL & KJAER 2203 Instructions And Applications

BRUEL & KJAER 2203
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4.5.
WEIGHTING
NETWORKS
The
characteristics
of
the
"A",
"B"
, and
"C"
weighting
networks
built
into
the
2203
are
given
in
Section
5.1 2.
4.6
.
OUTPUT
ATTENUATOR
AND
OUTPUT
AMPLIFIER
The
output
attenuator
is divided
into
two
sections placed
immediately
before and
after
the
first
stage
of
the
output
amplifier
to
optimize
the
signal
to
noise ratio.
The
range
of
the
output
attenuator
is
from
0
to
60
dB
in
10
dB steps
accurate
to
better
than±
0,2
dB.
The second stage
of
the
output
amplifier
drives
the
meter
rectifier
cir-
cuit
and
the
AC
output
socket
through
a
22J.LF
capacitor. The peak
out-
put
voltage
into
a load
impedance
of
at
least
10
kO is
16
V.
3,16
V
corresponds
to
full-scale
meter
deflection.
4.7.
RMS
DETECTOR
There are
three
common
values
used
in
characterizing
the
amplitude
value
of
an AC signal: ( 1) Peak, (2)
Average,
and (3) RMS.
The
peak
value is
of
use
when
wanting
to
protect
against
or
observe
amplifier
overload and also in shock and
vibration
testing.
However,
the
peak
value is
not
related
to
the
power
or
subjective
loudness
of
the
signal
since
it
does
not
consider
the
time
duration
of
the
signal.
Both average and RMS
values
do
consider
the
time
duration
of
the
signal,
but
both
mathematically
and
practically
the
average
value
has
found
little
use.
However,
the
RMS
value
is
directly
related
to
the
power
dissipated in
linear
systems and has
found
widespread
acceptance
and
use.
It
is
defined
as:
ARMS =
J~
]2
a2
(t)
dt
t,
According
to
this
definition,
a
circuit
to
detect
RMS
amplitudes
must
square
the
instantaneous
amplitudes
(a) and average
them
over a
timeT
= t
2
-
t
1
,
then
take
the
square
root
and
present
the
result
'i:o
the
meter
.
In
the
2203
this
is
accomplished
using
a
circuit
which
approximates
the
instantaneous
parabolic
transfer
characteristics
required
by
the
above
equation
and
performs
the
averaging
(integrating)
in
a
simple
RC
network.
The
circuit
has an
accuracy
of
±
0,
5 dB
for
signals
with
a
crest
28

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BRUEL & KJAER 2203 Specifications

General IconGeneral
BrandBRUEL & KJAER
Model2203
CategoryMeasuring Instruments
LanguageEnglish

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