The
2209
and
the
1/3
Octave Filter
Set
Types
1614/5
form a oomplete,
versatile analyzer
for
both
sound and vibration analysis.
The
output
may be
fed into
the
Level
Recorder and a
1/3
Octave Spectrogram (Fig.7.8) may be
produced.
7.3.2.
Impulses
Measurements may be made
in
real-time
9r
by
means
of
a
tape
recording.
Tape recorders, such as
the
B & K types, with a closed-loop facility are well
suited
to
this purpose. For analysis
the
2209
should be used
in
its
"Peak
Hold" mode and
the
meter should be reset before each signal
is
measured.
The arrangement
is
shown
in
Fig.7.10.
1024
2209
Fig.7.10. Measurement
of
single-event density spectrum
The Fourier Spectrum Density f
0
is:
_
[F
t.f
(t)
lmax
F
(to)
- 2
.6-f
where [F
t.f
(t) lmax
is
the
peak value measured and
.6.
f
is
the
filterband-
width.
98
To Next Page
Loading...
