National Instruments Isolated Analog Input Modules SCC-AI03 - Manual (Page 6)

SCC-AI Series Isolated Analog Input Modules User Guide 6 ni.com
Figure 2. Nonreferenced Signal Connection for the SCC-AI (One Channel)
If a high common-mode voltage is present, connect the negative input pins,
1 and 3, to the signal reference. Figure 3 shows a ground-referenced signal
connection on one channel of the SCC-AI.
Figure 3. Ground-Referenced Signal Connection for the SCC-AI
with High Common-Mode Voltage (One Channel)
For information about how to configure the SCC-AI module using
NI-DAQmx, refer to the SCC Quick Start Guide.
+
4
Lowpass
Filter
+
–
–
+
–
Lowpass
Filter
3
2
1
E/M Series DAQ Device
Signal
Source AI (X )
SCC-AI
AI SENSE
AI GND
AI (X+8)
AI SENSE on
SC-2345/2350
terminal block
or
AI GND on
SCC-68
10 to 100 k Ω
+
4
Lowpass
Filter
+
–
–
+
–
Lowpass
Filter
3
2
1
E/M Series DAQ Device
Signal
Source AI (X )
SCC-AI
AI SENSE
AI GND
AI (X+8)
High
CMV
+
–