Rigol DHO812 DHO800 series user manual

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Triggering the Oscilloscope

The trigger system allows you to set specific trigger conditions as required. The

oscilloscope captures a waveform as well as its neighboring part and displays them

on the screen once a particular trigger condition is met. For a digital oscilloscope, it

samples waveform continuously no matter whether it is stably triggered. Rather, only

stable triggering can produce stable display. The trigger module ensures that every

time base sweep or acquisition starts from the user-defined trigger condition, namely

every sweep is synchronous with the acquisition and the waveforms acquired are

overlapped so as to display the stable waveforms.

You should set the triggers based on the features of the input signal. To quickly

capture your desired waveforms, you need to understand the signal under test. This

oscilloscope provides a variety of trigger types that help you focus on the desired

waveform details.

You can enter the

Trigger menu in the following ways.

• Press the front-panel

key to enter the trigger menu.

• In

Figure 5.1

, click or tap the Trigger button to enter the trigger menu.

• Click or tap the trigger label (as shown in the figure below) at the top of the

screen to enter the trigger menu.

8.1 Trigger Source

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

desired source. Available sources include analog channels CH1-CH4 and EXT.

Analog Channel Input

Signals input from analog channels CH1-CH4 can all be used as trigger sources. No

matter whether the channel selected is enabled, the channel can work normally.

External Trigger Input (for DHO812 and DHO802 only)

The external trigger source can be used to trigger on the third channel while both the

channels are acquiring data. The trigger signal (e.g. external clock or signal of the

circuit under test) will be connected to EXT trigger source via the external trigger

input terminal [EXT TRIG] connector. You can set the trigger conditions within the

range of the trigger level (from -5 V to +5 V).

Triggering the Oscilloscope

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Rigol DHO812 oscilloscope