176
Keysight InfiniiVision 3000 X-Series Oscilloscopes User's Guide
11
Trigger Mode/Coupling
To select the Auto or Normal trigger mode
When the oscilloscope is running, the trigger mode tells the oscilloscope what to
do when triggers are not occurring.
In the
Auto
trigger mode (the default setting), if the specified trigger conditions are
not found, triggers are forced and acquisitions are made so that signal activity is
displayed on the oscilloscope.
In the
Normal
trigger mode, triggers and acquisitions only occur when the
specified trigger conditions are found.
To select the trigger mode:
1
Press the
[Mode/Coupling]
key.
2
In the Trigger Mode and Coupling Menu, press the
Mode
softkey; then select
either
Auto
or
Normal
.
See the following
"When to Use Auto Trigger Mode"
on page 177 descriptions.
You can also configure the
[Quick Action]
key to toggle between the Auto and
Normal trigger modes. See
"Configuring the [Quick Action] Key"
Triggering and the
Pre- and
Post-Trigger
Buffers
After the oscilloscope starts running (after pressing
[Run]
or
[Single]
or changing
the trigger condition), the oscilloscope first fills the pre-trigger buffer. Then, after
the pre-trigger buffer is filled, the oscilloscope starts searching for a trigger, and
sampled data continues to flow data through the pre-trigger buffer in a first-in
first-out (FIFO) manner.
When a trigger is found, the pre-trigger buffer contains the events that occurred
just before the trigger. Then, the oscilloscope fills the post-trigger buffer and
displays the acquisition memory. If the acquisition was initiated by
[Run/Stop]
, the
process repeats. If the acquisition was initiated by pressing
[Single]
, the acquisition
stops (and you can Pan and Zoom the waveform).
In either Auto or Normal trigger mode, a trigger may be missed if the event occurs
while the pre-trigger buffer is being filled. This may be more likely, for example,
when the horizontal scale knob is set to a slow time/div setting, such as
500 ms/div.
Trigger Indicator
The trigger indicator at the top right of the display shows whether triggers are
occurring.
In the
Auto
trigger mode, the trigger indicator can show:
Содержание InfiniiVision 3000 X Series
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Страница 48: ...48 Keysight InfiniiVision 3000 X Series Oscilloscopes User s Guide 1 Getting Started...
Страница 62: ...62 Keysight InfiniiVision 3000 X Series Oscilloscopes User s Guide 2 Horizontal Controls...
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Страница 122: ...122 Keysight InfiniiVision 3000 X Series Oscilloscopes User s Guide 6 Digital Channels...
Страница 128: ...128 Keysight InfiniiVision 3000 X Series Oscilloscopes User s Guide 7 Serial Decode...
Страница 134: ...134 Keysight InfiniiVision 3000 X Series Oscilloscopes User s Guide 8 Display Settings...
Страница 182: ...182 Keysight InfiniiVision 3000 X Series Oscilloscopes User s Guide 11 Trigger Mode Coupling...
Страница 200: ...200 Keysight InfiniiVision 3000 X Series Oscilloscopes User s Guide 12 Acquisition Control...
Страница 210: ...210 Keysight InfiniiVision 3000 X Series Oscilloscopes User s Guide 13 Cursors...
Страница 252: ...252 Keysight InfiniiVision 3000 X Series Oscilloscopes User s Guide 15 Mask Testing...
Страница 256: ...256 Keysight InfiniiVision 3000 X Series Oscilloscopes User s Guide 16 Digital Voltmeter...
Страница 290: ...290 Keysight InfiniiVision 3000 X Series Oscilloscopes User s Guide 19 Print Screens...
Страница 324: ...324 Keysight InfiniiVision 3000 X Series Oscilloscopes User s Guide 21 Web Interface...
Страница 344: ...344 Keysight InfiniiVision 3000 X Series Oscilloscopes User s Guide 22 Reference...
Страница 370: ...370 Keysight InfiniiVision 3000 X Series Oscilloscopes User s Guide 24 FlexRay Triggering and Serial Decode...
Страница 424: ...424 Keysight InfiniiVision 3000 X Series Oscilloscopes User s Guide 28 UART RS232 Triggering and Serial Decode...