10.4
Trigger add
-
ons
The trigger modes mentioned can be combined with a variety of extra features,
allowing triggers on almost any signal.
Some of these extra features are used to fine
-
tune the selected trigger mode.
Other extra features expand the capabilities of the basic trigger detector.
The following simplified diagram is from the settings sheet and shows the
building blocks that make the complete channel trigger logic.
Figure 10.9:
Channel trigger logic
A
To recorder trigger
From left to right, the following add
-
ons are available:
l
Slope
detector: allows to trigger on a slope instead of level
l
Pulse
qualifier: detects or rejects trigger conditions that meet a specific time
frame
l
Hold off:
disables the trigger detector for a set period of time after a trigger
condition
l
Interval:
defines a time interval between two consecutive trigger conditions
l
Events:
counts the number of trigger conditions before an actual trigger is
generated
10.4.1
Slope detector
All trigger functions described so far work on the absolute level of the incoming
signal. The slope detector allows the same functions to work on the
difference
between samples. This means that the triggering does not react to
specific levels, but to the differentiated signal or slope. The slope detector is
also known as differentiator or dY/dt detector. The output of the slope detector
is the difference between the newest sample and the sample that was recorded
the given number of sample intervals ago.
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