Catalyst AirCom UWB Analyzer, User Manual

Page: 38 / 110

Catalyst Enterprises Inc. Protocol Analyzer Projects
30
Pre-Trigger
The amount of data to be captured before and after the trigger may be set as a
percentage of pre-trigger, between 1% and 99%. 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 20.
Pre-trigger Data is 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 20. Pre-Trigger Example, 20% Pre-Trigger