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Chapter 2
Hardware Overview of the NI 783xR
Analog Output
Output Description
Full-scale range –1 LSB
Full-scale range –2 LSB
Midscale
Negative full-scale range,
+1 LSB
Negative full-scale range
Any output voltage
Note
If your VI does not set the output value for an AO channel, then the AO channel
voltage output will be undefined.
Connecting Analog Output Signals
NI 783xR User Manual
The bipolar output range of the NI 783xR AO channels is fixed at ±10 V.
Some applications require that the AO channels power on to known voltage
levels. To set the power-on levels, you can configure the NI 783xR to load
and run a VI when the system powers on. The VI can set the AO channels
to the desired voltage levels. The VI interprets data written to the DAC in
two's complement format. Table 2-3 shows the ideal AO voltage generated
for a given input code.
Table 2-3. Ideal Output Voltage and Input Code Mapping
AO Voltage
–9.999695
–10.000000
The AO signals are AO <0..n> and AOGND.
AO <0..n> are the AO channels. AOGND is the ground reference signal for
the AO channels.
Figure 2-9 shows how to make AO connections to the NI 783xR.
9.999695
9.999390
0.000000
—
2-14
Input Code (Hex)
(Two's Complement)
7FFF
7FFE
0000
8001
8000
AO Voltage
×
32,768
------------------------------ -
10.0 V
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