Trigger Mode/Coupling 11Keysight InfiniiVision 2000 X-Series Oscilloscopes User's Guide 149• Auto? (flashing) — the trigger condition is not found (after the pre-trigger bufferhas filled), and forced triggers and acquisitions are occurring.• Auto (not flashing) — the trigger condition is found (or the pre-trigger buffer isbeing filled).In the Normal trigger mode, the trigger indicator can show:• Trig'd? (flashing) — the trigger condition is not found (after the pre-trigger bufferhas filled), and no acquisitions are occurring.• Trig'd (not flashing) — trigger condition is found (or pre-trigger buffer is beingfilled).When the oscilloscope is not running, the trigger indicator area shows Stop.When to Use AutoTrigger ModeThe 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 areunnecessary.When to UseNormal TriggerModeThe 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 letsyou 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 deviceunder test, and you don't want the oscilloscope to auto-trigger before thathappens. Before initiating the action in the circuit, wait for the trigger conditionindicator Trig'd? to flash (this tells you the pre-trigger buffer is filled).See Also • “Forcing a Trigger" on page 127• “To set the trigger holdoff" on page 152• “To position the time reference (left, center, right)" on page 58To select the trigger coupling1 Press the [Mode/Coupling] key.
