Window Trigger Mode - HBM Genesis GEN5i User Manual

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10.3.3

Window trigger mode

For the window trigger mode both levels are used. One of them has a dual
function: arm and trigger, the other is used as a disarm level. To generate a
trigger, the trigger detector must be armed. This is done by crossing the arm/
trigger level in the opposite direction. Once armed, the trigger is generated by
crossing the arm/trigger level in the set direction, unless a crossing of the disarm
level has occurred after the arm condition.
Figure 10.5: Window trigger mode
A Trigger
Diagrams A and C show the intended use of the window trigger mode: detecting
a dip in a repetitive signal. Diagrams B and D show alternatives: detecting a
peak pulse in a repetitive signal.
The Window trigger mode is very useful if a periodic signal is monitored and
the GEN5i must be triggered on peak level changes. This mode is most effective
on uni-polar signals, e.g. a TTL level pulse train. For bi-polar signals the dual-
window trigger mode is more suited as described in the following section.
Relevant settings for this mode:
Mode: Window
l
Primary level: any value within the input range
l
Secondary level: any value within the input range
l
Direction: positive or negative for primary level, secondary level is
l
automatically set to the opposite
Hysteresis: any relevant value is used for both levels.
l
GEN5i
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