Chapter 5 Trigger RIGOL
MSO4000/DS4000 User’s Guide 5-31
Pattern Trigger
This trigger mode identifies a trigger condition by looking for a specified pattern.
The pattern is a logical “AND” combination of the channels. Each channel can have a
value of high (H), low (L) or don’t care (X). A rising or falling edge can be specified
for one channel included in the pattern. When an edge is specified, the oscilloscope
will trigger at the edge specified if the pattern set for the other channels are true
(namely the actual pattern of the channel is the same with the preset pattern). If no
edge is specified, the oscilloscope will trigger on the last edge that makes the pattern
true. If all the channels in the pattern are set to “Don’t Care”, the oscilloscope will not
trigger.
Press MENU (in the trigger control area (TRIGGER) at the front panel) Type, turn
the multi-function knob to select “Pattern” and press the knob. You can also
press Type continuously to switch to “Pattern” trigger.
At this point, the trigger setting information (include the trigger type, current channel
and trigger level/threshold level, as shown in the figure below) is displayed at the
upper-right side of the screen and changes with the trigger setting.
Besides, the pattern setting area (as shown in the figure below) is displayed at the
bottom of the screen to display the current pattern setting information (the pattern
of the channel currently selected is displayed in red).
Set the pattern trigger:
1. Set the channel pattern and adjust the trigger level/threshold level
1) Select the specified channel
Press Source to select the channel to be included in the desired pattern.
You can select CH1 to CH4, EXT or D0 to D15 (please refer to “
Trigger
Source”). The channel currently selected is displayed at the upper-right
side of the screen. At the same time, the pattern of the channel currently
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