
© National Instruments | 2-7
NI cDAQ-918x/919x User Manual
Using an Analog Source
Some C Series I/O modules can generate a trigger based on an analog signal. In NI-DAQmx, this
is called the Analog Comparison Event.
When you use an analog trigger source, the internal sample clock pauses when the Analog
Comparison Event signal is low and resumes when the signal goes high (or vice versa).
Note Depending on the C Series I/O module capabilities, you may need
two modules to utilize analog triggering.
Note Pause triggers are only sensitive to the level of the source, not the edge.
Getting Started with AI Applications in Software
You can use the cDAQ chassis in the following analog input applications:
• Single-point acquisition
• Finite acquisition
• Continuous acquisition
For more information about programming analog input applications and triggers in software,
refer to the NI-DAQmx Help or the LabVIEW Help for more information.
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