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Input Description
Full-scale range –1 LSB
Full-scale range –2 LSB
Midscale
Negative full-scale range +1 LSB
Negative full-scale range
Any input voltage
Input Modes
Input Mode
DIFF
When the NI 783xR is configured in DIFF input mode, each channel uses two
AI lines. The positive input pin connects to the positive terminal of the onboard
instrumentation amplifier. The negative input pin connects to the negative input
of the instrumentation amplifier.
RSE
When the NI 783xR is configured in RSE input mode, each channel uses only its
positive AI pin. This pin connects to the positive terminal of the onboard
instrumentation amplifier. The negative input of the instrumentation amplifier
connects internally to the AI ground (AIGND).
NRSE
When the NI 783xR is configured in NRSE input mode, each channel uses only
its positive AI pin. This pin connects to the positive terminal of the onboard
instrumentation amplifier. The negative input of the instrumentation amplifier on
each AI channel connects internally to the AISENSE input pin.
© National Instruments Corporation
±10 V. The converters return data in two's complement format. Table 2-1
shows the ideal output code returned for a given AI voltage.
Table 2-1. Ideal Output Code and AI Voltage Mapping
AI Voltage
9.999695
9.999390
0.000000
–9.999695
–10.000000
Output Code
--------------------------------- -
32,768
The NI 783xR input mode is software configurable. The input channels
support three input modes—differential (DIFF), referenced single ended
(RSE), and nonreferenced single ended (NRSE). The selected input mode
applies to all the input channels. Table 2-2 describes the three input modes.
Table 2-2. Available Input Modes for the NI 783xR
Chapter 2
×
10.0 V
Description
2-3
Hardware Overview of the NI 783xR
Output Code (Hex)
(Two's Complement)
7FFF
7FFE
0000
8001
8000
—
NI 783xR User Manual
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