RIGOL
2. Trigger Mode:
The trigger mode determines how the oscilloscope behaves in the absence of a
trigger event. The oscilloscope provides three trigger modes: Auto, Normal, and
Single.
Auto:
This trigger mode allows the oscilloscope to acquire waveforms even when
it does not detect a trigger condition. If no trigger condition occurs while
the oscilloscope waits for a specific period (as determined by the
time-base setting), it will force itself to trigger.
When forcing invalid triggers, the oscilloscope cannot synchronize the
waveform, and the waveform seems to roll across the display. If valid
triggers occur, the display becomes stable on the screen.
NOTE:
When horizontal control is set under 50ms/div, Auto mode allow the
oscilloscope go to the rolling mode without trigger.
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 occur, the oscilloscope acquire one waveform
then stop.
3. Coupling:
Trigger coupling determines what part of the signal passes 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 8kHz.
HF Reject:
HF Reject coupling attenuates all signal with a frequency higher than
150kHz.
Copyright 2004 Rigol Electronic
2-31
User Manual for DS5000 Series