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SDS1000X-E&SDS1000X-U User Manual
62
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Trigger Mode
The oscilloscope’s trigger mode includes auto, normal and single. Trigger mode
affects the way in which the oscilloscope searches for the trigger
After the oscilloscope starts running, the oscilloscope operates by first filling the
pre-trigger buffer. It starts searching for a trigger after the pre-trigger buffer is
filled and continues to flow data through this buffer while it searches for the trigger.
While searching for the trigger, the oscilloscope overflows the pre-trigger buffer
and the first data put into the buffer is first pushed out (First Input First Out, FIFO).
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.
Press the
Auto, Normal and the Single buttons on the front panel to select the
desired trigger mode, and the corresponding status light will be lighted.
In the Auto trigger mode (the default setting), if the specified trigger conditions
are not found, triggers are forced and acquisitions are made so hat signal
activity is displayed on the oscilloscope.
The Auto trigger mode is appropriate when:
Checking DC signals or signals with unknown levels or activity.
When trigger conditions occur often enough that forced triggers are
unnecessary.
In the
Normal trigger mode, triggers and acquisitions only occur when the
specified trigger conditions are found. Otherwise, the oscilloscope holds the
original waveform and waits for the next trigger.
The Normal trigger mode is appropriate when:
You only want to acquire specific events specified by the trigger settings.
Triggering on an infrequent signal from a serial bus (for example, I2C, SPI,
CAN, LIN, etc.) or another signal that arrives in bursts. The Normal trigger
mode lets you stabilize the display by preventing the oscilloscope from
auto- triggering.
In the
Single trigger mode, the oscilloscope waits for a trigger and displays the
waveform when the trigger condition is met and then stops.
The Single trigger mode is appropriate when:
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