4.
OPERATION
GENERAL
The
Bandpass Filter Sets Types
1614/15
are used for analysis of waveforms
in
1/3
and 1/1 octave bands. If
the
filter
output
is
to
be measured, amplified
or
attenuated,
or
if
the
input signal
is
greater
than
1 V
RMS,
suitable
instrumentation needs
to
be used
in
conjunction with
the
1614/15,
B & K
Amplifier Types
2603,
2604
and
2606
perform
the
above functions as does
Frequency Analyzer
Type
2107.
The
1614/15
can also be used with
the
Portable Precision Sound Level Meter
Type
2203
and
Impulse Precision
Sound Level Meter
Type
2204
for waveform analysis.
By
using
the
Level
Recorder
Type
2305
the
filters can be automatically scanned
in
succession
and
the
resulting analysis can be recorded. Using
the
1614
in
conjunction
with
the
FM
Tape Recorder
Type
7001 frequencies
down
to
0.05
Hz
can be
analyzed using frequency transformation techniques provided suitable
low
frequency measuring
equipment
is
available.
Another
possible use of
the
1614/15
is
the
production
of
1/3
and 1/1 octave bands
of
noise when used
with random noise Generator
Type
1402. Operation
of
the
1614/15
with
the
above mentioned instrumentation follows latter
in
this chapter.
1.
CONVERSION
OF
TYPE 1615 TO 1614
The
Type
1615
Filter
Set
does
not
contain
the
1/3
octave filters 2
Hz
to
20
Hz
and
25
kHz
to
160
kHz.
These
filters can be
obtained
from B&K, it
is
a simple
matter
to
insert
them
and no
adjustments
are necessary,
B&K
numbers for these filters are given
below
under
"Active and passive
1/3
octave filters". It should be pointed
out
that
a Resistor Board,
B&K
no.
XZ
0013
is
also required when
50-160kHz
filters are
to
be used and a new
front
panel scale, SA 0133,
should be
mounted.
Firstly, remove
the
instrument case after unscrewing
the
four
screws on
the
rear panel. Next, remove
the
metal panel
on
which
the
filter positions are
indicated.
The
extra
filters are inserted into
the
indicated positions after removing
the
dummy
cards, taking care
that
they
slide properly into
the
slots. (The filter
cards are secured only by
the
slots).
19
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