Using Referenced Single-Ended (Rse) Connections For Floating Signal Sources - National Instruments NI 6221 User Manual

Chapter 4 Analog Input
Using Referenced Single-Ended (RSE) Connections for Floating Signal
Sources
M Series User Manual
rejection of NRSE mode is better than RSE mode because the AI SENSE
connection is made remotely near the source. However, the noise rejection
of NRSE mode is worse than DIFF mode because the AI SENSE
connection is shared with all channels rather than being cabled in a twisted
pair with the AI+ signal.
Using the DAQ Assistant, you can configure the channels for RSE or NRSE
input modes. Refer to the
Software section for more information about the DAQ Assistant.
Figure 4-9 shows how to connect a floating signal source to the M Series
device configured for RSE mode.
+
Floating
Signal V
s
Source –
I/O Connector
Figure 4-9. RSE Connections for Floating Signal Sources
Using the DAQ Assistant, you can configure the channels for RSE or NRSE
input modes. Refer to the
Software section for more information about the DAQ Assistant.
Configuring AI Ground-Reference Settings in
AI <0.. n >
Input Multiplexers
AI SENSE
AI GND
Selected Channel in RSE Configuration
Configuring AI Ground-Reference Settings in
4-20
Programmable Gain
Instrumentation
+
Amplifier
+
PGIA
Measured
–
V
m
Voltage
–
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