Manual HP streamsmart 400 (page 41 of 60) (English)

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As you zoom out, each pixel represents a larger and larger set of readings.

Zooming in makes each pixel represent a smaller and smaller set of readings until,

when you have zoomed all the way in, each pixel finally does represent a single

reading. This is fundamental to the StreamSmart solution to data collection: the full

data set is available to the user and is only filtered for display and export purposes.

Since the data goes through these two distinct filters before it gets to the Statistic

Aplet, the advanced user benefits from understanding the default filtering process

and the other filtering options available.

During data streaming, each pixel in the display represents an interval of time and

all the sample readings collected during that time interval. For example, Figure 4-

22 shows the tracer at the pixel whose center is at 6.9 seconds. As stated

previously, all the data collected between x=6.85 seconds and x=6.95 seconds

have been represented by the average of those readings, which is 0.578. Figure 4-

23 shows all the data between x=6.9 seconds and x=7.0 seconds. All that data is

equivalent to the data represented by a single pixel in Figure 4-22! Only when the

StreamSmart Aplet has zoomed all the way in on a set of data is there a 1:1

correspondence between pixels and data points.

The default display filter uses the numerical average of the readings in an interval

to represent that set of readings. When you export the data to the Statistics Aplet,

the StreamSmart Aplet uses the same values that the display used. This method

ensures that the export filter is the same as the display filter.

The StreamSmart Aplet has a number of different filtering options for both display

and export purposes. Figure 4-24 shows the data stream in Figure 4-22 filtered by

the average of each pixel set. Figure 4-25 shows the same data set filtered by the

minimum of each pixel set, while Figure 4-26 is filtered by the maximum. The

oscillations hidden in Figure 4-22 and exposed by zooming in Figure 4-23 can

also be seen in Figure 4-25 and Figure 4-26, this time exposed by the filtering

methods. Once a filtering method is chosen, it is used for the current, as well as

future data streams until either the StreamSmart Aplet is reset or another filtering

method is chosen.

To choose a display filtering method:

1. P r e s s

@ R to enter the Plot Setup menu and use the X key to highlight

the DISPLAY FILTER field (Figure 4-27).

2. Press

!CHOOS to see the list of options (Figure 4-28).

Figure 4-24 Figure 4-25 Figure 4-26

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HP streamsmart 400 Manual

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