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(a)
(c)
Fig.3. (a) Single trace with measurement
setup, (b) single trace full screen dis-
play, (c) dual trace display in "up-
down" format
The most frequently used controls
on the 2032 are incorporated as "hard"
controls (Fig.4). These include those
used to start a measurement, to store
or recall setups and data, for cursor
control and field entry, and an autor-
ange and an autoscale control. The au-
torange control will autorange the in-
puts and then lock the input attenua-
tors at the optimum level. It can
operate on both continuous and tran-
sient signals. The autoscale control is
used to optimise the scaling of dis-
played data. (Both controls can also
be set manually.) This combination of
hard and soft controls makes the 2032
extremely user-friendly, and mini-
mises learning time.
Storage of Measurement and
Display Setups
The 2032 is equipped with non-vol-
atile memories for the storage of mea-
surement and display setups in order
to minimise setup times for frequently
repeated measurements. Up to 10
user-defined measurement setups and
10 user-defined display setups can be
stored for instant recall. In addition,
10 factory-defined measurement set-
ups and 10 factory-defined display
setups are held in read only memories.
Each stored measurement and dis-
play setup is identified by a number.
It
is recalled by entering this number
into the 2032. The measurement and
display setups in use are identified on
the 2032 display screen, and working
and documentation setups ensure that
a measurement is always completely
documented. As an aid to selection,
the measurement and display setups
can be listed on the 2032 display
screen, (Fig.5).
Input to the 2032
The 2032 has a fully instrumented
input. This means that it can accept
signals from most Brtiel
&
Kjrer micro-
phone preamplifiers and, via the Line
Drive Amplifier Type 2644, most
Bruel
&
Kjrer accelerometers, in either
of its channels, and without the need
for additional amplifiers or preampli-
fiers. In addition, each channel is
equipped with a direct input for the
input of electrical signals. The mini-
mum detectable signal level in each
channel is 11-L V, and the full scale level
can be selected from 15m V to 100 V
peak in a 1,5-2-4-6-8-10 sequence, ei-
ther manually or by using the autor-
ange control. The preamplifier input
of each channel has provision for a
microphone polarization voltage of
0 V, 28 V, or 200 V. The direct input
may be DC or AC coupled, the lower
limiting frequency in AC being 3Hz.
The line drive input is AC coupled,
with a selectable lower limiting fre-
quency of 3Hz or 0,2 Hz.
The upper limiting frequency of
each channel is selectable between
25,6kHz, (the cut-off frequency of the
antialiasing filter)", and 6,4 kHz, (used
to filter
out accelerometer reso-
nances). Alternatively, both filters can
be used simultaneously, or simulta-
neously switched out. Either input can
be inverted or grounded.
Calibration of the 2032
Each channel of the 2032 can be
independently calibrated in user-de-
fined engineering units, with the cali-
bration constant variable from 1 x
10-
9
V /unit to 999kV /unit or in dB
with a user-defined reference. Alter-
natively, it can be directly calibrated
in volts. Where the 2032 is calibrated
in engineering units, the calibration
Stop
I
a
I
iii
Gl
m
o
I
Fig.4. Some of the hard controls of the
2032
Fig.5. Listing of the stored user-defined
display setups
constant can be entered and displayed
as V /unit, V
N,
V /Pa, V /ms-
2
,
V /ms-
1
,
V /m, V
/N,
V /g, V /ins-1, V /mil, or
unitsN.
Trigger Functions on the 2032
The 2032 is equipped with an ex-
tremely flexible trigger. A free run-
ning, internal, or external trigger
source can be selected, in addition to a
generator trigger, where data collec-
tion in the 2032 is synchronised to the
sequence of the 2032's pseudo-random
or impulse generator. With internal
triggering, the trigger source is further
selectable to be the input signal either
before or after digital low pass filter-
ing, (that is band limitation to the
selected frequency span), in either
channel. The trigger slope can be posi-
tive or negative, and the trigger level
set from -99% to
+
99% of the peak
input voltage. With external trigger-
ing, the trigger slope can be positive or
negative. There is also provision for a
manual trigger.
A trigger delay is selectable in both
internal, external, and manual trigger-
ing. This sets a delay between the trig-
ger and the start of channel A or B,
and is adjustable in seconds from
-N.~
T, (N
=
no. of samples in are-
3
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