National Instruments NI 6323 User Manual

Chapter 4 Analog Input
© National Instruments 4-35 X Series User Manual
AI Start Trigger Signal
Use the AI Start Trigger (ai/StartTrigger) signal to begin a measurement
acquisition. A measurement acquisition consists of one or more samples.
If you do not use triggers, begin a measurement with a software command.
Once the acquisition begins, configure the acquisition to stop:
• When a certain number of points are sampled (in finite mode)
• After a hardware reference trigger (in finite mode)
• With a software command (in continuous mode)
An acquisition that uses a start trigger (but not a reference trigger) is
sometimes referred to as a posttriggered acquisition.
Retriggerable Analog Input
The AI Start Trigger can also be configured to be retriggerable. The timing
engine will generate the sample and convert clocks for the configured
acquisition in response to each pulse on an AI Start Trigger signal.
The timing engine ignores the AI Start Trigger signal while the clock
generation is in progress. After the clock generation is finished, the counter
waits for another Start Trigger to begin another clock generation.
Figure 4-22 shows a retriggerable analog input with three AI channels and
four samples per trigger.
Figure 4-22. Retriggerable Analog Input
Note
Waveform information from LabVIEW will not reflect the delay between triggers.
They will be treated as a continuous acquisition with constant t0 and dt information.
Reference triggers are not retriggerable.
AI Start Trigger
AI Sample Clock
AI Convert
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National Instruments NI 6323 Specifications

General

Brand	National Instruments
Model	NI 6323
Category	I/O Systems
Language	English