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The StreamSmart Aplet first tries to identify the attached sensors and makes several
decisions based on the characteristics of the sensors. The StreamSmart Aplet sets
the vertical scales for each data stream based on the units of the sensor and the
initial readings
The StreamSmart Aplet also sets the horizontal scale for the length
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of time represented by the width of the display. These default settings ensure that
the streams are visible in the display and moving at a perceptible rate. You can
vary the speed and vertical position of the streams to meet your needs, even while
the data is streaming. Occasionally, the StreamSmart Aplet may not be able to
identify a sensor. See Chapter 4, Advanced Topics for details on how to manually
identify an unrecognized sensor.
Data streams in at over 5,000 samples per second, and the data are shown
graphically on a 131 x 64 pixel display. At this rate and display resolution, if each
pixel column represented a single data point, the stream would move at an
extremely high rate. In fact, under these circumstances, the cursor would fly along
at over eight feet per second! To slow the stream down enough to make the motion
easily perceptible, each pixel in each data stream represents a set of data points.
The user can zoom in horizontally on the streams, essentially making each pixel
represent a smaller and smaller set of data points, or zoom out, making each pixel
represent a larger and larger data set. By default, the StreamSmart Aplet uses the
average of these data points to represent the entire set. In other words,
StreamSmart filters the data by using averages. However, you can choose other
filtering methods. For advanced filtering methods, refer to Chapter 4, Advanced
Topics. Although the data are averaged for graphing purposes, you still have
access to all the data. This is a unique feature of the StreamSmart 410.
The screens shown in Figure 2-7 and Figure 2-8 illustrate the location and basic
functions of the menu keys during and just after streaming. Use @ZOOM! and @@PAN#
to modify the appearance of the streams. \SCOPE starts streaming in oscilloscope
mode, in which the data streams from left to right across the screen, then repeats
upon reaching the right edge of the display, similar to the sweep of an
oscilloscope. \START /kSTOP is a toggle that stops and restarts data streaming. Once
you stop the stream, there are three additional functions available: Trace, Export,
and Next Page. Use !TRACE to view numerical characteristics of points in the data
stream. !EXPRT replaces the \SCOPE function once streaming is stopped; it opens a
set of tools for selecting a final data set to analyze.
(next page) displays
the second page of the menu key functions.
Figure 2-7 During Streaming
Figure 2-8 After Streaming
Streaming Experiments
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