LeCroy 9300C Series, Operator'S Manual

Page: 64 / 275

8 –18
Triggers and When to Use Them
Pattern Trigger
Pattern Trigger ( Fig. 8–14 ) enables triggering on a logical
combination of the inputs CH 1, CH 2 (plus CH 3 and CH 4 on four-
channels models) and EXT. This combination, called a pattern, is
defined as the logical AND of trigger states. A trigger state is either
high or low: high when a trigger source is greater than the trigger
level (threshold); low when less than this threshold (
Fig. 8–15 ). For
example, the pattern could be defined as present when the trigger
state for CH 1 is high, CH 2 is low, and EXT is irrelevant (X or don’t
care). If any of these conditions are not met, the pattern state is
considered absent. Limits can be selected from 10 ns to 20 s.
Figure 8–14. Pattern Trigger Menu (see page 8–33).
NOT AVAILABLE ON
9304C, 9310C, 9314C SERIES
Pattern
Trigger on
Pattern
with
Coupling DC|AC|LFREJ|HFREJ
1|2|3|4|Ext ( according to model )
Exiting |Entering
Level L|H|X|(Level value)
Off| Time (10 ns to 20 s)
|Evs (1 to 99 999 999)
Holdoff