152 Keysight InfiniiVision 3000 X-Series Oscilloscopes User's Guide
10 Triggers
• X sets the pattern to don't care on the selected channel. Any channel set to
don't care is ignored and is not used as part of the pattern. However, if all
channels in the pattern are set to don't care, the oscilloscope will not trigger.
• The rising edge ( ) or falling edge ( ) softkey sets the pattern to an edge
on the selected channel. Only one rising or falling edge can be specified 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.
If no edge is specified, the oscilloscope will trigger on the last edge that
makes the pattern true.
Hex Bus Pattern Trigger
You can specify a bus value on which to trigger. To do this, first define the bus. See
"To display digital channels as a bus" on page 114 for details. You can trigger on
a bus value whether you are displaying the bus or not.
To trigger on a bus value:
1 Press the [Pattern] key on the front panel.
2 Press the Channel softkey and rotate the Entry knob to select Bus1 or Bus2.
3 Press the Digit softkey and rotate the Entry knob to select a digit of the selected
bus.
4 Press the Hex softkey and rotate the Entry knob to select a value for the digit.
5 You can use the Set all Digits softkey to set all digits to a particular value.
When a hex bus digit contains one or more don't care (X) bits and one or more bit
with a value or 0 or 1, the "$" sign will be displayed for the digit.
Specifying an Edge in a Pattern
You are allowed to specify only one rising or falling edge term in the pattern. If you define an
edge term, then select a different channel in the pattern and define another edge term, the
previous edge definition is changed to a don't care.
If a digit is made up of less than four bits, then the value of the digit will be limited to the
value that can be created by the selected bits.
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