HP StreamSmart 400 StreamSmart 400 User Guide - Page 44

Oscilloscope mode, SCOPE, START, kSTOP

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Oscilloscope mode While streaming data in the Plot view, the StreamSmart Aplet provides you with the option of Oscilloscope mode. Press SCOPE to activate Oscilloscope mode. This menu key is a toggle, so press it again to return to normal data streaming. Oscilloscope mode works with a trigger to enable an oscilloscopic view of your data stream. With no trigger set, Oscilloscope mode displays the incoming data in sweeps. Data streaming occurs from left to right across the screen. When the stream hits the right edge of the display, it continues by returning to the left edge of the display and again streams from left to right. Each sweep takes the same amount of time and you can zoom in or out horizontally to adjust the sweep time. These features allow you to visually capture data that varies periodically, such as sound waves. A trigger can be set in order to position the data at a specific display location when the trigger is crossed. You can set an ascending or descending trigger. An ascending trigger starts the sweep at the trigger position when the data values first exceed the trigger value. A descending trigger starts the sweep when the data values first drop below the trigger value. The operation of the trigger mechanism assures that when the triggering value is reached, the first data point is plotted where the dotted trigger lines intersect. You can also set a two-way trigger. While in Oscilloscope mode, the zoom and pan features both work as they do during data streaming. The result is that you can manipulate the visual display of an oscillating data stream to meet your specific needs rather easily. Table 4-3 and Table 4-4 describe the menu key functions available in Oscilloscope mode. Table 4-3 Oscilloscope menu keys, page 1 Menu Key @ZOOM/$PAN! @ZOOM $PAN$ @TRGR@ !SCOPE \\START /kSTOP Description This key toggles between zooming and panning (scrolling) with the direction keys. When on, use the direction keys to zoom in or out, vertically or horizontally, to adjust the size of the oscilloscope window in sensor units or seconds. When on, use the direction keys to scroll vertically or horizontally in the display. Toggles the trigger off and on. When on, use the direction keys to set the location of the trigger. This key toggles Oscilloscope mode off and on. This key toggles between start and stop. Press !STOP to stop the stream of data; press START to begin a new data stream. 40 Advanced Topics

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Advanced Topics
40
Oscilloscope mode
While streaming data in the
Plot
view, the StreamSmart Aplet provides you with
the option of
Oscilloscope
mode. Press
SCOPE
to activate
Oscilloscope
mode. This
menu key is a toggle, so press it again to return to normal data streaming.
Oscilloscope
mode works with a trigger to enable an oscilloscopic view of your
data stream. With no trigger set,
Oscilloscope
mode displays the incoming data
in sweeps. Data streaming occurs from left to right across the screen. When the
stream hits the right edge of the display, it continues by returning to the left edge
of the display and again streams from left to right. Each sweep takes the same
amount of time and you can zoom in or out horizontally to adjust the sweep time.
These features allow you to visually capture data that varies periodically, such as
sound waves.
A trigger can be set in order to position the data at a specific display location
when the trigger is crossed. You can set an ascending or descending trigger. An
ascending trigger starts the sweep at the trigger position when the data values first
exceed the trigger value. A descending trigger starts the sweep when the data
values first drop below the trigger value. The operation of the trigger mechanism
assures that when the triggering value is reached, the first data point is plotted
where the dotted trigger lines intersect. You can also set a two-way trigger.
While in
Oscilloscope
mode, the zoom and pan features both work as they do
during data streaming. The result is that you can manipulate the visual display of
an oscillating data stream to meet your specific needs rather easily. Table 4-3 and
Table 4-4 describe the menu key functions available in
Oscilloscope
mode.
Table 4-3
Oscilloscope menu keys, page 1
Menu Key
Description
@ZOOM
/
$PAN!
This key toggles between zooming and panning (scrolling) with
the direction keys.
@ZOOM
When on, use the direction keys to zoom in or out, vertically or
horizontally, to adjust the size of the oscilloscope window in
sensor units or seconds.
$PAN$
When on, use the direction keys to scroll vertically or horizontally
in the display.
@TRGR@
Toggles the trigger off and on. When on, use the direction keys to
set the location of the trigger.
!SCOPE
This key toggles
Oscilloscope
mode off and on.
\\START
/
kSTOP
This key toggles between start and stop. Press
!STOP
to stop the
stream of data; press
START
to begin a new data stream.