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2010
EXT.
B & T PROGRAM
2020
REMOTE BANDWIDTH
CONTROL
173145
Fig. 5. 5
.
Example of a remote bandwidth switching connection be-
tween 2010 and 2020
10Hz
2010
EXT.
B & T PROGRAM
JP 0802
2020
REMOTE BANDWIDTH
CONTROL
31,6 Hz
100Hz
GROUND
173144
Fig. 5
.
6.
Example of remote bandwidth switching of 2010 and
2020 from other equipment
However, if both the 2010 and the 2020 are to be remotely controlled by some external
apparatus, the frequency control on the 201 0 must be electrically driven (see section
3.8.1 ). Parallel connections must be made between the pins of the REMOTE BAND-
WIDTH CONTROL socket on the 2020, and the EXT. B & T PROGRAM socket on the
201 0. Interconnection to perform the same operation given in the preceding example is
shown in Fig.5.6. The switching is remotely controlled by grounding the termination
corresponding to the filter bandwidth required
.
5.4. DIGITAL EVENT RECORDER 7502
5.4.1. High Speed Analysis
Narrow constant bandwidth analyses
,
while providing much detail information about the
signal analyzed, are notoriously time consuming. In many practical situations it can,
therefore, be a considerable advantage to reduce this analysis time to a few minutes
from what might have been an hour or more. The basic problems are the averaging
time
,
and therefore, the permitted rate of sweep with a particular bandwidth. These prob-
lems are fully discussed in sections 4.3 and 4.4. If, however, the signal were to be
transformed upwards in frequency, the analysis bandwidth required for a particular reso-
lution would be also increased, permitting a faster rate of sweep. By employing transfor-
mation ratios as large as the instrumentation will permit, significantly shorter analysis
times can be achieved
.
61
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