Differential Connections For Ground-Referenced Signal Sources - National Instruments AT E Series User Manual

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