Chapter4 SignalConnections
6023E/6024E/6025EUser Manual 4-14 ni.com
Differential Connections for Ground-ReferencedSignal Sources

Figure 4-5 shows how to connect a ground-referenced signal source to a

channel on the device configured in DIFF input mode.

Figure4-5. DifferentialInput Connections for Ground-Referenced Signals

Withthis type of connection, the PGIA rejects both the common-m ode

noise in the signal and the ground potential difference between the signal

sourcean d the deviceground, shownas Vcm in Figure 4-5.

Ground-
Referenced
Signal
Source
Common-
Mode
Noiseand
Ground
Potential
InputMultiplexers
AISENSE
Vm
Measured
Voltage
AIGND
–
+
–
+
+
–
–
+
I/OConnector
ACH+
ACH–
SelectedChannel in DIFF Configuration
PGIA
ProgrammableGain
Instrumentation
Amplifier
Vs
Vcm