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Data history
By default, StreamSmart 400 collects data from a single sensor at approximately
5,700 samples per second while streaming. At this rate, the StreamSmart Aplet
can collect approximately 16.5 seconds of data before memory is full. You can use
the options in the Experiment menu to increase the time allotted to an experiment,
or you can change the way the StreamSmart Aplet allocates memory to data
streams via the History field in the second page of the Plot Setup menu. Press
@
R
%%@PAGE#]p{px]% to access this menu. Figure 4-29 illustrates the second page of
the Plot Setup menu with the History Type field highlighted. By default, this field
is set to Fixed, meaning that the StreamSmart Aplet will store all data collected
during streaming for a fixed amount of time. The amount of time will vary,
depending on the number of sensors in use. The current duration (in seconds) is
shown in the History field. In this case, streaming can continue for a total of
16.453 seconds. You can change the History Type from Fixed to Auto by
pressing !CHOOS and selecting the Auto option (see Figure 4-30). If the History
Type is set to Auto, then streaming will continue indefinitely. However, as
streaming continues, less and less of the older data is saved.
The Auto setting is useful for starting a stream and not worrying about when an
experiment is going to start. Since the most recent data is saved in its entirety and
only the oldest data is selectively purged, you can start a stream and just let it run
until you are ready to start an experimental procedure.
Table 4-2 Additional export filters
Name Description
Auto This is the default option. It matches the export filter to the display filter.
WYSIWYG This option filters the data so that the scatter plot in the Statistics Aplet
matches the graph in the StreamSmart Aplet exactly. The results of this
filtering depends on your zoom level.
Figure 4-29 Figure 4-30
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