Teledyne LeCroy TA700_800_850 User Manual - Manual (Page 95)

Custom Capture Data Project Catalyst Enterprises, Inc.
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Set Trigger
Set trigger is available to be set by the user for states S1 - S31. When set trigger is
selected, a trigger is enabled, when the Sequencer enters that state for the first time.
The amount of data to be captured before and after the trigger may be set as a
percentage of pre-trigger, between 0% and 100%. This may be done by positioning the
pre-trigger slider to the desired percentage. This feature allows the evaluation of bus
activity leading up to and after the triggering event. The operation of the pre trigger in
the data memory is conceptually illustrated in Figure 74
Pre-Trigger Data: The capture of the specified percentage of the data prior to the triggering
event cannot be guaranteed and may in some cases be 0. This can occur in
cases where the triggering event occurs before the required number pre-
trigger event data can be stored. In these cases the data display will show
fewer than the specified data points prior to the triggering event.
Figure 74 Pre-Trigger Example, 20% Pre-Trigger