HP 54520 Series - Page 94

Trigger
Pattern Trigger Mode
When Softkey
The when softkey selects when the trigger is to occur. The choices are listed
below:
Entering a pattern — The trigger occurs on the edge of the source that is
the last edge to make the pattern true.
Exiting a pattern — The trigger occurs on the edge of the source that is
the first edge to make the pattern false.
A pattern is present greater than a defined time -—~ A timer starts when the
pattern is entered. If the pattern is present greater than the specified
time, a trigger occurs on the first edge to exit the pattern.
A pattern is present less than a defined time — A timer starts when the
pattern is entered. If the pattern is present less than the specified time,
the trigger occurs when the pattern is exited.
A time range — When a pattern is present greater than a defined time and
less than another defined time. A timer starts when the pattern is
entered. If the pattern is present greater than one specified time and less
than another specified time, the trigger occurs when the pattern is exited.
Holdoff Softkey
The holdoff softkey allows you to select the amount of holdoff. Holdoff
disables the trigger circuit for a selectable time period or number of patterns
after the pattern is found. Holdoff is selected in time units, from 40 ns to
320 ms and is incremented in 20-ns intervals or by the number of patterns
from 2 to 16,000,000. The maximum pattern counting rate is 70 MHz.