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BRUEL & KJAER 2305 - Signal Conditioning Controls; Range and Resolution Settings

BRUEL & KJAER 2305
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INPUT
ATTENUATOR
rotary
switch
attenuates
the
input
signal
in
six
accurate
steps
of
10 dB
each.
In
position
"
0"
no
attenuation
is
introduced
by
the
circuit.
INPUT
POTENTIOMETER
enables
the
input
signal
to
be
varied
continuously
over
a
range
of
approximately
12
dB.
When
in
position
"10",
the
attenuation
of
the
input
signal
is
zero,
in
position
"0"
the
attenuation
is
approximately
12
dB.
When
sign
a
ls
with
important
fr
e
quency
components
a
round
200
kHz
(kc/s)
are
to
be
recorded,
the
INPUT
POTENTIOMETER
should
pr
e
ferably
be
in
position
"10", see
Fig
. 1.2
on
page
8.
100
mV
REF.
pushbutton
is
situated
below
the
INPUT
POTENTIOMETER.
When
pressed
it
causes
the
reference
voltage
(100
mV
mains
frequency)
to
be
fed
to
the
INPUT
of
the
Recorder.
May
be
attenuated
by
means
of
the
INPUT
ATTENUATOR
and
INPUT
POTENTIOMETER
in
the
same
manner
as
any
other
input
signal.
NOTE:
The
calibration
of
the
Recorder
by
the
reference
voltage
is
correct
only
with
RMS
detection
.
In
case
of
Peak
detection
an
error
of
up
to
1 dB
may
exist,
whereas
with
Average
the
error
is
negligible
.
See
also
Fig.
A7
and
page
121.
POTENTIOMETER
RANGE
rotary
switch
,
enables
the
resolving
power
of
the
Recorder's
writing
system
to
be
adjusted
according
to
the
Range
Potentio·
meter
used.
Logarithmic Range Potentiometer;
commonly
used
combinations
are
:-
Range
Potentiometer
POTENTIOMETER
RANGE
on
10 dB 10
25 dB
50dB
75
dB
25
50
80
When
employing
these
settings
the
combinations
for
LOWER
LIMITING
FREQUENCY
and
WRITING
SPEED
control
knob
setting
given
in
Fig
.
2.2
will
be
valid. A
higher
re
solving
power
than
that
according
to
the
table
may
be
used,
but
in
this
case
the
stability
of
the
Recorder
has
to
be
considered
and
the
WRITING
SPEED
reduced.
The
highest
and
lowest
resolving
powers
correspond
to
the
positions
of
the
POTENTIOMETER
RANGE
marked
"10"
and
"80"
respectively
.
Linear Range Potentiometer;
combinations
in
practice
can
be:-
22
Range
Potentiometer
POTENTIOMETER
RANGE
on
10-35
mV
12
10-HOmV
16
10--35
mV
Potentiometer.
When
setting
POTENTIOMETER
RANGE
Oil
"12"
Fig. 2.2
can
be
utilized
for
the
combined
setting
of
the
knobs
LOWER
LIMITING
FREQUENCY
and
WRITING
SPEED.

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