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10.3.3 Window trigger mode
For the window trigger mode, both levels are used. One of the levels has a dual
function, arm and trigger. The other level 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 the disarm level has
been crossed after the arm level has been.
A A
A A
A/T
A/T
2
D
D
D
D
3 4
A/T
A/T
1
Figure 10.6: Window trigger mode
A Trigger
Diagrams 1 and 3 show the intended use of the window trigger mode, detecting
a dip in a repetitive signal. Diagrams 2 and 4 show alternatives, detecting a
peak pulse in a repetitive signal.
The Window trigger mode is very useful if a periodic signal is monitored and
GEN3i 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:
l
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
automatically set to the opposite direction
l
Hysteresis: any relevant value is used for both levels.
GEN3i
150 I3763-3.1 en HBM: public