Connecting Analog Output Loads; Minimizing Glitches On The Output Signal - National Instruments USB-6008 User Manual

Connecting Analog Output Loads

To connect loads to the NI USB-6008/6009, connect the positive lead of the load to the AO
terminal, and connect the ground of the load to a GND terminal, as shown in the following
figure.

Minimizing Glitches on the Output Signal

When you use a DAC to generate a waveform, you may observe glitches in 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. For more information
about minimizing glitches, refer to the KnowledgeBase document, Reducing Glitches on the
Analog Output of MIO DAQ Devices. To access this document, go to
the Info Code
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Digital I/O
The NI USB-6008/6009 has 12 digital lines on two ports, Port 0 has eight lines, P0.<0..7>, and
Port 1 has four lines, P1.<0..3>. GND is the ground-reference signal for the digital I/O ports.
You can individually program all lines as inputs or outputs.
The following figure shows P0.<0..7> connected to example signals configured as digital
inputs and digital outputs. You can configure P1.<0..3> similarly.
18 | ni.com | NI USB-6008/6009 User Guide
Figure 13. Connecting a Load
NI USB-6008/6009
.
AO
Load
GND
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