Input Modes; Input Range - National Instruments NI PXI-7831R User Manual

Table 2-1. Ideal Output Code and AI Voltage Mapping (Continued)
Input Description
Midscale
Negative full-scale range +1 LSB
Negative full-scale range
Any input voltage

Input Modes

Input Mode
DIFF When the NI PXI-7831R 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, and the negative input pin connects to the
negative input of the instrumentation amplifier.
RSE When the NI PXI-7831R 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 is
internally tied to the AI ground (AIGND).
NRSE When the NI PXI-7831R 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 is internally connected to the AI sense (AISENSE) input pin.

Input Range

© National Instruments Corporation
AI Voltage
0.000000
–9.999695
–10.000000
Output Code
--------------------------------- -
32,768
The NI PXI-7831R input mode is software configurable. The input
channels support three input modes—differential (DIFF) input, referenced
single-ended (RSE) input, and nonreferenced single-ended (NRSE) input.
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 PXI-7831R
The NI PXI-7831R AI range is fixed at ±10 V.
Chapter 2 Hardware Overview of the NI PXI-7831R
×
10.0 V
Description
2-3
Output Code (Hex)
(Two's Complement)
0000
8001
8000
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NI PXI-7831R User Manual