Trigger Coupling; Trigger Holdoff - Rigol DHO900 User Manual

Triggering the Oscilloscope
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.
In Normal and Single trigger modes, you can click or tap the Force button in the
trigger menu or press the front-panel
8.4

Trigger Coupling

Trigger coupling determines what part of the signal is passed to the trigger circuit.
Please distinguish it from channel coupling (
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.
8.5

Trigger Holdoff

Trigger holdoff can be help stabilize triggering on complex repetitive waveforms that
have multiple edges or other events between waveform repetitions (such as pulse
series). Holdoff time is specified as the amount of time that the oscilloscope waits for
re-arming the trigger circuitry after generating a correct trigger. The oscilloscope will
not trigger even if the trigger condition is met during the holdoff time and will only
re-arm the trigger circuitry after the holdoff time expires.
DHO800 User Guide
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key to force a trigger event.
To Specify Channel Coupling
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