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Chapter 2
Hardware Overview of the NI 783xR
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Floating
V
Signal
s
Source
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I/O Connector
NI 783xR User Manual
In single-ended input modes, electrostatic and magnetic noise couples into
the signal connections more than in differential input modes. The coupling
is the result of differences in the signal path. Magnetic coupling
is proportional to the area between the two signal conductors. Electrical
coupling is a function of how much the electric field differs between the
two conductors.
Single-Ended Connections for Floating Signal
Sources (RSE Input Mode)
Figure 2-7 shows how to connect a floating signal source to a channel on
the NI 783xR configured for RSE input mode.
AI+
AI–
AISENSE
AIGND
RSE Input Mode Selected
Figure 2-7. Single-Ended Input Connections for Nonreferenced or Floating Signals
Single-Ended Connections for Grounded Signal
Sources (NRSE Input Mode)
To measure a grounded signal source with a single-ended input mode, you
must configure the NI 783xR in the NRSE input mode. Then connect the
signal to the positive input of the NI 783xR instrumentation amplifier and
connect the signal local ground reference to the negative input of the
instrumentation amplifier. The ground point of the signal should be
connected to AISENSE. Any potential difference between the NI 783xR
ground and the signal ground appears as a common-mode signal at both the
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Instrumentation
Amplifier
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2-12
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Measured
V
m
Voltage
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ni.com
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