National Instruments NI PCI-6110 - Manual (Page 41)

Chapter 4 Connecting Signals
© National Instruments Corporation 4-11 NI PCI-6110/6111 User Manual
Differential Connections for Ground-Referenced
Signal Sources
Figure 4-4 shows how to connect a ground-referenced signal source to a
channel on the NI PCI-6110/6111.
Figure 4-4. Differential Input Connections for Ground-Referenced Signals
With this type of connection, the PGIA rejects both the common-mode
noise in the signal and the ground potential difference between the signal
source and the device ground, shown as V
cm
in Figure 4-4.
PGIA
Ground-
Referenced
Signal
Source
Common-
Mode
Noise and
Ground
Potential
V
s
V
cm
+
–
+
–
I/O Connector
ACH0 Connections Shown
ACH0GND
ACH0–
ACH0+
+
–
+
–
V
m
Measured
Voltage
Instrumentation
Amplifier