USB-6008/6009 User Guide and Specifications 14 ni.com

Connecting Analog Output Loads

To connect loads to the 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.
Figure 11. Connecting a Load

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 DAQ 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 low-pass deglitching filter to remove some of
these glitches, depending on the frequency and nature of the output signal.
Refer to ni.com/support for more information about minimizing
glitches.
Digital I/O
The USB-6008/6009 has 12 digital lines, P0.<0..7> and P1.<0..3>, which
comprise the DIO port. GND is the ground-reference signal for the DIO
port. You can individually program all lines as inputs or outputs.

Digital I/O Circuitry

Figure12 shows P0.<0..7> connected to example signals configured as
digital inputs and digital outputs. You can configure P1.<0..3> similarly.
USB-6008/6009
GND
AO
Load