National Instruments NI 783xR Benutzerhandbuch

© 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.

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 2-1.  Ideal Output Code and AI Voltage Mapping

Full-scale range –1 LSB

9.999695

7FFF

Full-scale range –2 LSB

9.999390

7FFE

Midscale

0.000000

0000

Negative full-scale range +1 LSB

–9.999695

8001

Negative full-scale range

–10.000000

8000

Any input voltage

—

Table 2-2.  Available Input Modes for the NI 783xR

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.

Output Code

32,768

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10.0 V

×