National Instruments 636 Series User Manual

© National Instruments | 4-31
X Series User Manual
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 does not reflect the delay between
triggers. They are treated as a continuous acquisition with constant t0 and dt
information.
Reference triggers are not retriggerable.
Using a Digital Source
To use AI Start Trigger with a digital source, specify a source and an edge. The source can be
any of the following signals:
• PFI <0..15>
•RTSI <0..7>
• Counter n Internal Output
• PXI_STAR
• PXIe_DSTAR<A,B>
• Change Detection Event
• AO Start Trigger (ao/StartTrigger)
• DI Start Trigger (di/StartTrigger)
• DO Start Trigger (do/StartTrigger)
The source can also be one of several other internal signals on your DAQ device. Refer to Device
Routing in MAX in the NI-DAQmx Help or the LabVIEW Help for more information.
You can also specify whether the measurement acquisition begins on the rising edge or falling
edge of AI Start Trigger.
Using an Analog Source
When you use an analog trigger source, the acquisition begins on the first rising edge of the
Analog Comparison Event signal.
AI Start Trigger
AI Sample Clock
AI Convert

National Instruments 636 Series Specifications

General

Brand	National Instruments
Model	636 Series
Category	Data Loggers
Language	English