RIGOL Chapter 5 To Trigger the Oscilloscope
5-16 DS8000-R User Guide
Pattern Trigger
Identifies a trigger condition by searching for a specified pattern. This pattern is a
logical "AND" combination of channels. Each channel can be set to H (high), L (low),
or X (don't care). A rising or falling edge (you can only specify a single 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
is true (namely the actual pattern of the channel is the same as 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 "X", the oscilloscope will not
trigger.
Figure 5-5 Pattern Trigger
Trigger Type:
Click Type to select "Pattern" as the trigger type. Then, the current trigger setting
information is displayed at the upper-right corner of the screen, as shown in the
figure below.
Source Selection:
Click Source to open the signal source list and select CH1-CH4. For details, refer to
descriptions in "Trigger Source". The current trigger source is displayed at the
upper-right corner of the screen.
Note: Only when we select the channel (that has been input with signals) as the
trigger source, can we obtain a stable trigger.
Pattern Setting:
Click Code to select the pattern of the currently selected channel. The available
patterns include the following five types:
âš« H: sets the pattern of the channel selected to "1", i.g. the voltage level is higher
than the trigger level of the channel.
âš« L: sets the pattern of the channel selected to "0", i.g. the voltage level is lower
than the trigger level of the channel.
âš« X: sets the pattern of the channel selected to "X", i.g. this channel is not used as
a part of the pattern. When all channels in the pattern are set to "X", the
oscilloscope will not trigger.
âš« Rising: sets the pattern to the rising edge ( ) of the channel selected.
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