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BRUEL & KJAER 2305 - Description

BRUEL & KJAER 2305
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Description
General.
The
Level
Recorder
Type
2305
has
been designed
for
accura
te
recording
of
signal levels
in
the
fr
eq
u
ency
range
2 Hz
(c
I
s)
to 200000 Hz
(c
I
s)
.
Typical
fields
of
application
are
the
recording
of
frequ
e
ncy
r
esponse
characteristics,
reverberation
decay
curves,
noise
and
vibration
levels,
spectrograms,
and
polar
diagrams
.
Potenti
ometer
db-Ranll'
Fig. 1.1.
Block
diagram
of
the
Level Recorder.
f59J98
Record'
ings
can
be
made
by
means
of
ink
,
either
on
lined
paper
or
on
frequency
calibrated
paper,
or
by
means
of
a
sapphire
stylus
on
wax-coated
paper.
Different
types
of
ink
and
preprinted
recording
paper
are
available
.
A
synchronous
motor
is
used
for
the
paper
drive,
and
by
means
of
a gear-
box 12
different
paper
speeds
are
available.
The
operation
of
the
Recorder
is
based
upon
the
servo
principle
.
When
the
magnitude
of
the
voltage
applied
to
the
input
terminals
is
changed,
a
current
will flow
through
the
driving
coil
of
the
writing
system,
thus
moving
the
stylus,
which
is
mechanically
coupled
to
the
Range
Potentiometer.
By
the
movement
of
the
stylus
the
voltage
delivered
from
the
Potentiometer
to
the
input
amplifier
will be
altered
until
a
stable
condition
is
regained.
In
this
way
it
is
possible
to
obtain
recordings
for
different
ranges
of
voltage
variations
by
employing
different
Range
Potentiometers
.
Ii

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