National Instruments SCXI -1122 - Manual (Page 28)

Signal Connections Chapter 3
SCXI-1122 User Manual 3-6 © National Instruments Corporation
Vs
Vcm
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Figure 3-2. Ground-Referenced Signal Connection with High Common-Mode Voltage
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Figure 3-3. Floating Signal Connection Referenced to Chassis Ground for Better SNR
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C
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Figure 3-4. Floating AC-Coupled Signal Connection Referenced
to Chassis Ground for Better SNR