Oscilloscope Mode - HP StreamSmart 400 User Manual

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
40 Advanced Topics
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
stream of data; press START to begin a new data stream.
!STOP to stop the