Qualified Trigger - LeCroy WaveRunner Xi series Operator's Manual

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AVE UNNER I

Qualified Trigger

H Q T
OW UALIFIED RIGGERS
Use a signals transition above or below a given level (its validation) as an enabling (qualifying) condition for a
second signal that is the trigger source. These are Qualified triggers. For Edge Qualified triggers (the default) the
transition is sufficient and no additional requirement is placed on the first signal. For State Qualified triggers the
amplitude of the first signal must remain in the desired state until the trigger occurs. A qualified trigger can occur
immediately after the validation, or following a predetermined time delay or number of potential trigger events.
The time delay or trigger count is restarted with every validation.
Within Time creates a time window within which a trigger can occur.
Wait Time determines a delay from the start of the desired pattern. After the delay (timeout) and while the
pattern is present, a trigger can occur. The timing for the delay is restarted when the selected pattern begins.
Events determines a minimum number of events of the trigger source. An event is generated when a
trigger source meets its trigger conditions. On the selected event of the trigger source and while the pattern is
present, a trigger can occur. The count is initialized and started whenever the selected pattern begins, and
continues while the pattern remains. When the selected count is reached, the trigger occurs.
Edge Qualified and Wait: Trigger after timeout. The broken upward-pointing arrows indicate potential triggers, while the bold ones
show where the actual triggers occur.
Q F T
UALIFIED IRST RIGGER
•
Qualified First trigger is intended to be used exclusively in Sequence Mode to speed up the trigger rate. With
Qualified First trigger, a single valid trigger is sufficient to acquire a full sequence. Other than in Sequence
Mode, Qualified First is identical to the Qualified triggers.
•
In data storage applications, the index pulse can be defined as the qualifier signal and the servo gate signal
as the trigger source.
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