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Chapter 2 Hardware Overview of the NI 783xR
NI 783xR User Manual 2-12 ni.com
You can configure the NI 783xR channels in software for RSE or NRSE
input modes. Use the RSE input mode for floating signal sources. In this
case, the NI 783xR provides the reference ground point for the external
signal. Use the NRSE input mode for ground-referenced signal sources. In
this case, the external signal supplies its own reference ground point and the
NI 783xR should not supply one.
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.
Figure 2-7. Single-Ended Input Connections for Nonreferenced or Floating Signals
RSE Input Mode Selected
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+
–
+
–
+
Floating
Signal
Source
I/O Connector
AISENSE
AIGND
V
m
Measured
Voltage
Instrumentation
Amplifier
AI+
AI–
V
s