Using An Analog Source; Minimizing Glitches On The Output Signal; Getting Started With Ao Applications In Software - National Instruments NI cDAQ-9181 User Manual

Chapter 3 Analog Output

Using an Analog Source

Some C Series modules can generate a trigger based on an analog signal. In NI-DAQmx, this is
called the Analog Comparison Event, depending on the trigger properties.
When you use an analog trigger source, the samples are paused when the Analog Comparison
Event signal is at a high or low level, depending on the trigger properties. The analog trigger
circuit must be configured by a simultaneously running analog input task.
Depending on the C Series module capabilities, you may need two modules
Note
to utilize analog triggering.

Minimizing Glitches on the Output Signal

When you use a DAC to generate a waveform, you may observe glitches on the output signal.
These glitches are normal; when a DAC switches from one voltage to another, it produces
glitches due to released charges. The largest glitches occur when the most significant bit of the
DAC code changes. You can build a lowpass deglitching filter to remove some of these glitches,
depending on the frequency and nature of the output signal. Go to
information about minimizing glitches.

Getting Started with AO Applications in Software

You can use the cDAQ chassis in the following analog output applications:
• Single-point (on-demand) generation
• Finite generation
• Continuous generation
• Waveform generation
For more information about programming analog output applications and triggers in software,
refer the LabVIEW Help or to the NI-DAQmx Help.
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