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Fig.12. Rear Panel of the 2032
spectrum, coherent or non-coherent
output power spectrum, liftered spec-
trum, or any sound intensity spectrum
can be A-weighted across any frequen-
cy span. Finally, cepstra can be short
or longpass liftered with selectable
lifter length.
Hard Copy from the 2032
Two possibilities exist for obtaining
a hard copy from the 2032. The first is
to use the Graphics Recorder Type
2313, (Fig.11). This is of special signif-
icance, since the 2313 produces fully
annotated plots of the 2032 display,
including both graphics and alphanu-
merics, in less than
10
seconds each. It
also offers the possibility of further
post processing of results. The second
possibility for hard copy is to use the
X-Y Recorder Type 2308. An example
of such a hard copy is shown in Fig.13.
Since the plot includes automatically
ruled axes, plain ungraduated paper
can be used. The 2032 also has a video
output.
6
INPUT
CHARACTERISTICS:
Two
Identical
channels (Channel A
&
B)
lnputt:
Independent selection of 3 Inputs on
both channels
Preamp. Input:
VIa standard B
&
K 7 pJn "Pre-
amplifier Input• 0
+
28 or 200 V Microphone
Polarization Voltage can be selected
Accelerometer Input:
Line Drive via TNC
connector. Coupling: AC 3 dB down at 0,2 Hz
or 3Hz nominal
Direct Input:
VIa
~NC
connector. Impedance:
1 M0//100pF. COUI)IIng: AC down 3dB at 3Hz
I
Ill Ill
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The Digital Cassette Recorder Type
7 400 represents a means of mass-stor-
age of results from the 2032. It stores
the results and measurement setup
from the 2032 in a form in which they
may be later re-entered in to the 2032,
used as direct input to a computer, or
plotted on the 2313. At least 18 com-
plete sets of results can be stored on
single cassette, and more can be stored
when abbreviated formats are used.
The
7
400 can also be used to store
complete sets of user-defined mea-
surement and display setups for later
re-entry into the 2032.
Built-in generator and self-test
The built-in generator of the 2032
can supply a sine wave, random noise,
pseudo-random noise, or an impulse.
The generator is a zooming generator,
in that with a random or pseudo-ran-
dom noise output, the noise spectrum
is bandlimited to match the selected
frequency span. The frequency of the
sine wave is programmable. The im-
Specifications 2032
nominal.
DC
with
automatic
De-offset
compensation
· ·
Maximum Peak Input Voltage:
28 ranges
+
from 15mV to 100V In a 1,5, 2, 3, 4, 6, 8, 10
sequence. Normal or Inverted
Input Autorange:
Selects optimum peak In-
put voltage on both channels
·
Maximum Input Voltage:
100V RMS. 20321s
designed to be operated with Its signal and
chassis ground at earth potential. To ensure
safe operation according to IEC 348, the volt-
age of the signal ground relative to earth
must not exceed 42 V RMS
pulse is a signal one sample wide re-
peated every record, (that is once for
every 2048 samples recorded).
The built-in
generator.
is for use as a
signal source in system measurements,
and also for self-test of the 2032. In
the latter, the 2032 is used to check its
own functions and indicate whether
the self-test has been passed or failed.
In the case of failure, error codes are
given to help locate the source of the
fault. The 2032 performs a self-test
each time it is switched on .
IEC/IEEE Interface
The 2032 contains as standard a
flexible and user-friendly IEC 625-1/
IEEE Std. 488 interface, enabling it be
connected to a large number of com-
puters, desk-top calculators, and other
digital equipment. The interface al-
lows Brtiel & Kjrer to offer a state-of-
the-art modal analysis package, devel-
oped by Structural Measurement Sys-
tems, Inc., San Jose, California as an
option to the 2032.
A feature of the 2032 IEC!IEEE in-
terface is 10 special functions keys
mounted on 2032 front panel. Each of
these can be used to generate a service
request over the interface, for exam-
ple,
·
to start a computer controlled se-
quence of measurements in an auto-
matic test. Note that it is possible to
completely disable the 2032 front pan-
el controls when it under control over
the IEC!IEEE interface.
Fig.13. Example of a hard copy obtained
using the X- Y Recorder Type 2308
Analog Antlaliaelng Filtere:
2 matched low-
pass filters with 25,6kHz cut-off frequen"CY:
Max.
±
0,3 dB ripple In the pa,sband. Provide
at least 75 dB attenu$tlon of those Input fre-
quencies Which can cause aliasing. Max.
gain'
difference: 0,3 dB. Max. phase difference: 3°
up to 20kHz.
so
up to 25,8 kHz. The filters can
be
bypassed
Low
Pan
Filten:
2 matched low-pass filters
with 6,4kHz
cu,
t -off frequency. Max. gain dlf-
·)
terence: 0,1 dB. Max. phase difference: 1
o
up
to 6,4 kHz. The filters can be
bypassed,,
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