RIGOL
© Copyright
RIGOL
Technologies, Inc. 2007.
2-57
User’s Guide for DS1000 Series
Trigger, such as the output of Power supply.
NOTE:
When horizontal control is set under 50 ms/div, Auto mode allows the
oscilloscope don’t capture trigger signal.
z
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.
z
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 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 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 because you can see the events that led up to the
trigger point. Everything to the right of the trigger point is called post-trigger
information. The amount of delay range (pre-trigger and post-trigger information)
available is dependent on the sweep speed selected.
