Rigol DS1000CA series Guide de l'utilisateur télécharger pdf (Page 70)

RIGOL

User‟s Guide for DS1000CA Series

2-42

occur, the display becomes stable on the screen.

Any factor results in the un-stability of waveforms can be detected by Auto

Trigger, such as the output of Power supply.

NOTE: When horizontal control is set under 50 ms/div, Auto mode allows the

oscilloscope not to capture trigger signal.

 Normal:

The Normal mode allows the oscilloscope to acquire a waveform only when it is

triggered. If no trigger occurs, the oscilloscope keeps waiting, and the previous

waveform, if any, will remain on the display.

 Single:

In Single mode, after pressing the RUN/STOP key, the oscilloscope waits for

trigger. While the trigger occurs, the oscilloscope acquires one waveform then

stop.

3. Coupling:

Trigger coupling determines which signal component passing to the trigger circuit.

Coupling types include AC, DC, LF Reject and HF Reject.

 AC: AC coupling blocks DC components.

 DC: DC coupling passes both AC and DC components.

 LF Reject: LF Reject coupling blocks DC component, and attenuates all signal

with a frequency lower than 8 kHz.

 HF Reject: HF Reject coupling attenuates all signals with a frequency higher

than 150 kHz.

4. Pre-trigger/delayed trigger:

The data collected before and after trigger.

The trigger position is typically set at the horizontal center of the screen. In the

full-screen display the 6div data of pre-trigger and delayed trigger can be

surveyed. More data (14div) of pre-trigger and 1s delayed trigger can be

surveyed by adjusting the horizontal knob.

This feature is very useful to study the events that led up to the trigger point.

Everything to the right of the trigger point is called post-trigger information. The

delay range (pre-trigger and post-trigger information) depends on the sweep

speed selected.

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Rigol DS1000CA series Guide de l'utilisateur Page 70