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Chapter 4
Signal Connections
Ground-
Referenced
Signal
V
s
Source
Common-
Mode
Noise and
V
cm
Ground
Potential
I/O Connector
PCI-6023E/6024E/6025E User Manual
Differential Connections for Ground-Referenced
Signal Sources
Figure 4-5 shows how to connect a ground-referenced signal source to a
channel on the board configured in DIFF input mode.
ACH+
+
-
ACH-
+
-
Input Multiplexers
AISENSE
AIGND
Selected Channel in DIFF Configuration
Figure 4-5. 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 board ground, shown as V
cm
4-14
Programmable Gain
Instrumentation
Amplifier
+
PGIA
+
Measured
-
V
m
Voltage
-
in Figure 4-5.
© National Instruments Corporation
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