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• Normal: In this trigger mode, triggers and acquisitions only occur when the

specified trigger conditions are found. This trigger mode can be used when the

signal is at a low repetition rate, when you only want to acquire specific events

specified by the trigger settings, or when you try to stabilize the display by

preventing the oscilloscope from auto-triggering.

• Single: In this trigger mode, a single trigger and acquisition only occur when the

specified trigger conditions are found, and then the oscilloscope stops. This

trigger mode can be used when you need to make a single acquisition of the

specified event and analyze the acquisition result. You can pan and zoom the

currently displayed waveform without subsequent waveform data overwriting

the current waveform. After a single trigger is initiated, the oscilloscope is in

"STOP" state.

Normal and Single trigger modes, you can click or tap the Force button in the

trigger menu or press the front-panel key to force a trigger event.

8.4 Trigger Coupling

Trigger coupling determines what part of the signal is passed to the trigger circut.

Please distinguish it from channel coupling (

To Specify Channel Coupling

). This

function is available only when the trigger type is Edge and the trigger source is an

analog channel.

In the "Trigger" menu, click or tap the Coupling drop-down button to select the

desired coupling mode (by default, it is DC).

• DC: allows DC and AC components to pass the trigger circuitry.

• AC: blocks the DC components and attenuates the signals.

• LFR: blocks the DC components and rejects the low-frequency components.

• HFR: rejects the high frequency components.

TIP

When "AC" or "LFR" is selected as the coupling mode, no trigger level lines and trigger icons

are displayed. When you adjust the trigger level, you can only see the changes of the trigger

level values in the trigger information label at the top of the screen.

Triggering the Oscilloscope

HDO1000 User Guide

Rigol HDO1000 Series User Manual

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