Keysight InfiniiVision HD3 Series - Page 142

142 Keysight InfiniiVision HD3-Series Oscilloscopes User's Guide
10 Triggers
• > (Greater Than) — when the pattern is present for greater than a time value.
The trigger occurs when the pattern exits (not when the > time value is
exceeded).
• Timeout — when the pattern is present for greater than a time value. In this
case, the trigger occurs when the > time value is exceeded (not when the
pattern exits).
• >< (In Range) — when the pattern is present for a time within a range of
values.
• <> (Out of Range) — when the pattern is present for a time outside of range of
values.
Pattern durations are evaluated using a timer. The timer starts on the last edge
that makes the pattern (logical AND) true. Except when the Timeout qualifier is
selected, the trigger occurs on the first edge that makes the pattern false,
provided the time qualifier criteria has been met.
The time values for the selected qualifier are set using the < and > qualifier time
set fields.
4 Use the Set All buttons to set the pattern for all channels to 1, 0, or X (don't
care).
5 To set the pattern for individual channels, select the channel; then, select one
of the Set Selected Channel buttons:
• 0 sets the pattern to zero (low) on the selected channel. A low is a voltage
level that is less than the channel's trigger level or threshold level.
• 1 sets the pattern to 1 (high) on the selected channel. A high is a voltage
level that is greater than the channel's trigger level or threshold level.
• 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 ( ) selections set the pattern to an edge
on the selected channel. Only one rising or falling edge can be specified in
the entire 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 in the entire pattern, the oscilloscope will trigger on
the last edge that makes the pattern true.
NOTE
Specifying an Edge in a Pattern
You can specify only one rising or falling edge term in the pattern. If you select an edge for a
channel and then select an edge for a different channel, the selection for the first channel is
changed to a don't care.