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Chapter 2 Hardware Overview of the NI 783xR
© National Instruments Corporation 2-13 NI 783xR User Manual
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
positive and negative inputs of the instrumentation amplifier. The
instrumentation amplifier rejects this difference. If the input circuitry of a
NI 783xR is referenced to ground in RSE input mode, this difference in
ground potentials appears as an error in the measured voltage.
Figure 2-8 shows how to connect a grounded signal source to a channel on
the NI 783xR configured for NRSE input mode.
Figure 2-8. Single-Ended Input Connections for Ground-Referenced Signals
NRSE Input Mode Selected
–
+
–
+
–
+
–
+
V
cm
V
s
Ground-
Referenced
Signal
Source
Common-
Mode
Noise and
Ground
Potential
I/O Connector
AISENSE
AIGND
V
m
Measured
Voltage
Instrumentation
Amplifier
AI+
AI–