Analog Output Reglitch Selection - National Instruments DAQ PCI E Series User Manual

Analog Output Reglitch Selection

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Selecting a bipolar range for a particular DAC means that any data
written to that DAC will be interpreted as two's complement format. In
two's complement mode, data values written to the analog output
channel can be either positive or negative. If you select unipolar range,
data is interpreted in straight binary format. In straight binary mode,
data values written to the analog output channel range must be positive.
PCI-MIO-16XE-10 and PCI-6031E
You can configure each analog output channel for either unipolar or
bipolar output. A unipolar configuration has a range of 0 to 10 V at the
analog output. A bipolar configuration has a range of –10 to +10 V at
the analog output. You do not need to configure both channels for the
same range.
Selecting a bipolar range for a particular DAC means that any data
written to that DAC will be interpreted as two's complement format. In
two's complement mode, data values written to the analog output
channel can be either positive or negative. If you select unipolar range,
data is interpreted in straight binary format. In straight binary mode,
data values written to the analog output channel range must be positive.
PCI-MIO-16E-1 and PCI-6071E
In normal operation, a DAC output will glitch whenever it is updated
with a new value. The glitch energy differs from code to code and
appears as distortion in the frequency spectrum. Each analog output
contains a reglitch circuit that generates uniform glitch energy at every
code rather than large glitches at the major code transitions. This
uniform glitch energy appears as a multiple of the update rate in the
frequency spectrum. Notice that this reglitch circuit does not eliminate
the glitches; it only makes them more uniform in size. Reglitching is
normally disabled at startup and your software can independently
enable each channel.
3-13
Chapter 3 Hardware Overview
PCI E Series User Manual