Keysight DSOX3012T, User Manual

Page: 209 / 530

Trigger Mode/Coupling
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Keysight InfiniiVision 3000T X-Series Oscilloscopes User's Guide 209
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:
• Auto? — the trigger condition is not found (after the pre-trigger buffer has filled),
and forced triggers and acquisitions are occurring.
• Auto — the trigger condition is found (or the pre-trigger buffer is being filled).
In the Normal trigger mode, the trigger indicator can show:
• Trig'd? — the trigger condition is not found (after the pre-trigger buffer has
filled), and no acquisitions are occurring.
• Trig'd — trigger condition is found (or pre-trigger buffer is being filled).
When the oscilloscope is not running, the trigger indicator area shows Stop .
When to Use Auto
Trigger Mode
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.
When to Use
Normal Trigger
Mode
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.
• Making single-shot acquisitions with the [Single] key.
Often with single-shot acquisitions, you must initiate some action in the device
under test, and you don't want the oscilloscope to auto-trigger before that
happens. Before initiating the action in the circuit, wait for the trigger condition
indicator Trig'd? to display (this tells you the pre-trigger buffer is filled).
See Also • “Forcing a Trigger" on page 171
• “To set the trigger holdoff" on page 212
• “To position the time reference (left, center, right, custom)" on page 72
To select the trigger coupling
1 Press the [Mode/Coupling] key.