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Isolated Analog Input Modules User Guide

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SCC-AI Series Isolated Analog Input Modules 6 ni.com
Figure 1-3. SCC-AIXX Signal Connections
The inputs are designed in a floating (nonreferenced) single-ended
configuration. If the measured signals are floating, connect the negative
input pins, 1 and 3, to AISENSE on the SC-2345 terminal block through
a10kΩ to 100 kΩ resistor. Figure 1-4 shows a floating signal connection
on one channel of the SCC-AIXX.
Figure 1-4. Nonreferenced Signal Connection for the SCC-AIXX (One Channel)
+
4
Lowpass
Filter
+
–
–
+
–
+
–
Lowpass
Filter
3
2
1
E Series DAQ Device
Signal
Source
ACH(
X
)
SCC-AI
XX
AISENSE
AIGND
ACH(
X
+8)
+
4
Lowpass
Filter
+
–
–
+
–
Lowpass
Filter
3
2
1
E Series DAQ Device
Signal
Source
ACH(
X
)
SCC-AI
XX
AISENSE
AIGND
ACH(
X
+8)
AISENSE
on SC-2345
terminal block
10–100 kΩ