Manual HP streamsmart 400 (page 44 of 60) (English)

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Advanced Topics

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.

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HP streamsmart 400 Manual

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