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Chapter 4 Signal Connections
National Instruments Corporation 4-21 AT-MIO/AI E Series User Manual
Differential Connections for Ground-Referenced
Signal Sources
Figure 4-6 shows how to connect a ground-referenced signal source to
an AT E Series board channel configured in DIFF input mode.
Figure 4-6. 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 AT E Series board ground, shown as V
cm
in
Figure 4-6.
Ground-
Referenced
Signal
Source
Common-
Mode
Noise and
Ground
Potential
Input Multiplexers
AISENSE
Instrumentation
Amplifier
V
m
Measured
Voltage
AIGND
-
+
-
+
V
s
V
cm
+
-
-
+
I/O Connector
ACH<0..7>
ACH<8..15>
Selected Channel in DIFF Configuration
PGIA