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BRUEL & KJAER 2204 - Page 22

BRUEL & KJAER 2204
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Switching
to
the
position
marked
"Batt."
makes
the
meter
pointer
deflect.
If
this
deflection is
within
the
range
marked
"Battery"
on
the
meter
scale,
the
batteries
are
serviceable,
otherwise
replace. See
"Calibration
Check"
page
20.
The
other
positions
of
the
knob
marked
A,
_ B
and
C
on
either
side
are
used
for
connection
of
the
l?
J
!ilt
:.
in
weighting
networks.
"Lin."
gi
_y~_Yl
e
meter
a
linear
frequency
~espon
~
and
"E
~
t
~
Filt."
i
~
jl
sea
wh~
Q
~n
-
e~letD&l
-----
--'"-
--
---
--
filter
or
weighting
network
is
connected
to
the
meter
.
The
rf
ght
hand
positions
are
used
when
a
high
damping
of
the
meter
is desired-, while
the
left
hand
positions
are
used
for
normal
damping.
KNOB 2 and
KNOB
3.
These
are
range
setting
switches
operating
in
conjunction
with
each
other.
(KNOB 2
controls
the
input
attenuator
and
KNOB 3
the
output
attenuators).
When
there
is a deflection
on
the
meter
the
value indicated
should
be
added
to
the
figure
in
the
circle
to
give
the
cor
_
rect
result
of
·
the
measurement.
KNOB 3
should
always
be
.
as
far
clockwise
as
possible
as
this
gives
the
best
signal
to noise
ratio.
SENSITIVITY
ADJUSTMENT
This
is a
screwdriver
operated
potentiometer
used
for
matching
the
amplifica-
tion
of
the
amplifiers
to
the
sensitivity
of
the
microphone.
Once
set
it
should
not
be
touched
unless
the
apparatus
has
been
out
of
use
for
some time
or
a
marked
change
in
temperature
has
taken
place,
and
then
only
when
a
·
calibration
check
indicates
that
it
is necessary.
LIGHT.
This
button
controls
the
light
on
the
meter
scale.
In
order
to
save
the
batteries
it
is
spring
loaded
so
that
the
meter
scale is illuminated only
when
the
button
is
kept
depressed.
FILTER
INPUT
,
FILTER
OUTPUT.
These sockets
are
for
connection
to
the
terminals
of
an
external
filter
when
the
instrument
is used
for
frequency
analysis
.
The
output
impedance
of
the
first
amplifier
at
the
EXT.
FILTER
IN
socket
is
25
ohm.
The
input
impedance
of
the
second
amplifier
at
the
EXT.
FILTER
OUT
socket
is
146
kohm
in
parallel
with
45
pF.
OUTPUT.
This socket
can
be
connected
to a
tape
recorder
or
level
recorder
when
measurements
are
to
be
recorded
for
later
evaluation.
It
takes
the
cable
AO
0007 (plug
JP
0006).
The
load
impedance
should
be
at
least 10
kohm
.
Maximum
output
voltage
(for
full scale deflection
on
the
meter) is 3 V
RMS.
Maximum
peak
value
10
V.
20

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