High and low level trigger
|The analogue trigger input is continuously sampled at the selected
sample rate. If the user programmed level is exceeded by the trigger signal,
then the trigger is seen as valid and acted upon. Once the waveform generator
is replaying a signal, further triggers are ignored until the replay period
has completed. This trigger mode can be combined with AND or OR logic from
other sources, e.g. a software trigger (such as key press) or from the LVTTL
trigger input connector. The green trace shows when this high level trigger
will be valid for logic combination. A programmed level is simply made by the
programmer in the appropriate register of the driver software.
|This level trigger also works for low level situations, that is when
the trigger signals falls below the programmed level.
|Note that in both diagrams above the "Start" indicates the point
at which the card was armed ready to receive triggers, here the start occurred when the
trigger condition was already fulfilled, so instantly the card starts to replay.
The "start" could be at any point in time as determined by the user and his application.
This trigger mode can be combined with AND or OR logic from other sources,
e.g. a software trigger (such as key press) or from the LVTTL trigger input
connector. The above is just a summary of the versatile window trigger features.
Full details of the trigger operation can be found in the user manual.
Images courtesy of Spectrum GmbH
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Last modified by DataQuest Solutions Ltd 09.03.17