10 Digital Trigger Modes; Introduction - HBM Genesis GEN5i User Manual

10 Digital Trigger Modes

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10.1

Introduction

Within the GEN5i data acquisition system, each and every channel is equipped
with a trigger detector, which makes it possible to record just the phenomenon
of interest, instead of having to search the full memory to find it. The trigger
detector gives the system the power to capture elusive, short and unpredictable
events. It determines how easily you can extract the event of interest.
The word trigger has a dual meaning in recording techniques. In the active
sense, the instrument has triggered, indicating that the instrument has
responded to a certain stimulus. In the passive sense, as in trigger point, it
indicates the point (in time) where the instrument has triggered. In both cases,
trigger refers to a known, pre-defined situation.
The trigger can be generated in several ways:
by the user, i.e. manually
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using an externally applied signal, i.e. external trigger
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when the acquired signal complies with a certain condition: the trigger
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condition. Each channel within a recorder can trigger this recorder.
For transient recording this last option is of great importance. The trigger
facilities determine to a large extent the application capabilities of the data
acquisition system - i.e. how effectively the data can be captured.
In this chapter the trigger capabilities of the GEN5i data acquisition system will
be explained in full detail.
Each channel within a recorder can trigger this recorder. This functionality is
realized by combining all channel triggers into a logical OR combination: When
one of the channels (or multiple channels) generates a trigger, the complete
recorder triggers. Each channel's trigger detector can be switched off or set into
one of the modes described in this chapter.
GEN5i
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