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GEN7iB

132

DIGITAL TRIGGER MODES

10 Digital Trigger Modes

10.1 Introduction

Within the GEN7iB data acquisition system, 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ndit.Thetriggerdetectorgivesthesystemthe

power to capture elusive, short and unpredictable events. It determines how easily the

event of interest can be extracted.

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) when

theinstrumenthastriggered.Inbothcases,triggerreferstoaknown,predenedsitua-

tion.

The trigger can be generated in several ways:

● by the user, i.e. manually

● using an externally applied signal, i.e. external trigger

● when the acquired signal complies with a certain condition: the trigger condition.

Each channel within a recorder can trigger this recorder.

For transient recording, this last option is of great importance. To a large extent, the

trigger facilities determine 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 GEN7iB 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 chan-

nels (or multiple channels) generates a trigger, the complete recorder triggers. Each

channel's trigger detector can be switched off or set to one of the modes described in

this chapter.

Notice

This chapter describes all GEN series trigger options. However, not every acquisition card

will support each described option. Check the specications of each acquisition card to nd

out what options are supported for this specic card.

HBK GEN7iB GEN Series User Manual

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