3-6 | ni.comChapter 3 Analog OutputUsing an Analog SourceSome C Series modules can generate a trigger based on an analog signal. In NI-DAQmx, this iscalled the Analog Comparison Event, depending on the trigger properties.When you use an analog trigger source, the samples are paused when the Analog ComparisonEvent signal is at a high or low level, depending on the trigger properties. The analog triggercircuit must be configured by a simultaneously running analog input task.Note Depending on the C Series module capabilities, you may need two modulesto utilize analog triggering.Minimizing Glitches on the Output SignalWhen 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 producesglitches due to released charges. The largest glitches occur when the most significant bit of theDAC 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 ni.com/support for moreinformation about minimizing glitches.Getting Started with AO Applications in SoftwareYou can use the cDAQ controller in the following analog output applications:• Single-point (on-demand) generation• Finite generation• Continuous generation• Waveform generationFor more information about programming analog output applications and triggers in software,refer the LabVIEW Help or to the NI-DAQmx Help.
