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BRUEL & KJAER 2204 - Weighting Potentiometers

BRUEL & KJAER 2204
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The
Filter
Set
Type
1613
contains
11
filters
with
centre
frequencies
in
a~cordance
with
ISO
standards
as
follows:
31.5-
63-
125-
250-
500-
1ooo -
2ooo
-
4ooo
-
8ooo
- 16ooo
and
31500 Hz.
The
overall
range
of
the
Filter
Set
is
thus
22
Hz
to
45
kHz.
OODOOOODOODOOOOOOOOODOOOOOODODODOOOOOOODODO
lo!lioii.K;-
O>
c--"-
db
f--
\t--
1---
---
+-
r---.:1
'-
"
r----r-
1- -
-v-
f--=
-
1+
--
--~
l
" r---c---
\t--
1-
!--"
r--i
1
-----t
-
r---
r---
. -
r------,
r-
t-
f-
-+
1---f---1
--/
r--
t·
10
-/-
+ -
-\
,.___.
'
'+'
-
f'-+-
,
___
-t---
-
~
r-
-Y;-
1--
-1
--t-
,__._r-
1
-
~
-
-1
--+-
-
1-+h
_
+I-
f
- ~
---t--
-j-
1---1
-
--\-
-
1-
+-
I
t-
--
t--:1-1-
· - 'h - t-
--1
-,
\
-1
-\-
t-
-1-
+
1-
-,
1
-+-
1
f-
1-
1-
1-t---t-
H -H
f-
H 11
--·
1
----\
-1 ,
-
c-V
-v
f-
tr
---+-t-' -
--l
-H
t
-II
·
r-H
1-1-
"
- '
+-'
·
-{
-
r;
-
~
t-
1---
'
.
t--r--v -
1-r-\
-1\
--
--
N --
-
/--\:-1-1
-
'
...,
1000
t
-r--
--r--
: ' ' +
+---+--+--+
•
-r----+-+--+--+-
~ ;
:-T-:
.
H- i-+-+-+
1=
•
--t-
· -r- -
I
~
-
t-
r
-1-
--
1-
-:---+--+
'
H
--
1
-:--t--i-
- + 1-'- -
--t
-.
-
-
\
-+--+--~
·
-
~
10000
266oo3
Fig. 9.9.
Complete
set
of
filter
characteristics
for
Type
1619.
Weighting
Potentiometers.
Each
filter
output
is
paralleled
by
a
potentiometer
which
makes
it
possible
to
attenuate
the
signal
from
the
pass-band
by
anything
from
0
to
50 dB.
This
may
be
useful
when
it
is
desired
to
weight
the
filter
characteristics
to
noise
limit
requirements
for
particular
applications.
An
example
of
such
weighting
is
given
in
Fig.
3.4.
The
potentiometers
are
adjusted
with
the
aid
of
a
screwdriver
through
small
holes
in
the
front
cover.
A
signal
source
of
variable
frequency
is
necessary
for
the
adjustment.
The
·
signal
may
be
electrical
when
the
Adaptor
JJ
2612
is
used
with
the
Sound
Level
Meter,
or
acoustical
when
the
micro-
phone
is
employed.
The
Sound
Level
Meter
is
used
as
an
indicator
and
the
potentiometers
are
switched
in
and
out
by
means
of
a
switch
in
the
upper
right
hand
corner
of
the
front
plate.
When
the
Filter
Set
is
used
with
the
Sound
Level
Meter
Type
2203
correct
impedance
matching
is
obtained.
Note:
Usit
_g
the
Filter
Set
with
other
instruments
it
should
be
remembered
that
the
impedance
of
the
signal
source
should
be
less
than
25
ohm
and
the
load
resistance
should
be
146
Kohm
in
parallel
with
50
- 80
pF.
The
maximum
input
voltage
that
can
be
applied
to
the
filters
without
noticeable
distortion
is
approximately
1
V.
T"jpe 2203
supplies
o.3 V
at
full
scale
deflection
of
the
meter.
17

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