Analog Output; Connecting Analog Output Signals - National Instruments NI 7831R User Manual

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

© National Instruments Corporation
The NI 7831R has eight 16-bit AO channels. The bipolar output range 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 7831R to load and run your VI when the system powers on. This 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
9.999390
0.000000
–9.999695
–10.000000
The AO signals are AO <0..7> and AOGND.
AO <0..7> are the eight available AO channels. AOGND is the ground
reference signal for the AO channels.
Figure 2-10 shows how to make AO connections to the NI 7831R.
Chapter 2
—
2-15
Hardware Overview of the NI 7831R
Input Code (Hex)
(Two's Complement)
7FFF
7FFE
0000
8001
8000
AO Voltage
×
32,768
------------------------------ -
10.0 V
NI 7831R User Manual