A
B
C
P
Figure 10.10:
Slope trigger
A
Trigger
B
Original signal
C
Differentiated signal
With the slope triggering, it is possible to trigger on a specific change in slope
of the signal, for example on a spike on a repetitive signal. If the slope (or
frequency) of the signal exceeds the specified level, a trigger is generated.
10.4.2
Pulse detector
The pulse detector can be used together with the basic (slope) trigger level
detector. It can be used for two opposite purposes:
l
Detect trigger conditions smaller than a set period of time:
pulse detect
l
Detect trigger conditions larger than a set period of time:
pulse reject
All operations of the trigger detector are the result of crossing the level of a
comparator.
Pulse detect
If, after crossing, the condition of the comparator is
NOT
stable for the specified
period of time, the crossing is a valid trigger condition, i.e. it is a short pulse (or
noise), and a trigger is generated.
Pulse reject
If, after crossing, the condition of the comparator is stable for at least a specified
period of time, the crossing is a valid trigger condition, i.e. it is a long enough
pulse that must be recorded, and a trigger is generated.
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