Differential Connections For Ground-Referenced Signal Sources; Figure 4-4. Differential Input Connections For Ground-Referenced Signals - National Instruments E Series User Manual

Ground-
Referenced
+
Signal
V
s
Source
-
Common-
Mode
+
Noise and
V
cm
Ground
-
Potential
I/O Connector

Figure 4-4. Differential Input Connections for Ground-Referenced Signals

National Instruments Corporation
Differential Connections for Ground-Referenced
Signal Sources
Figure 4-4 shows how to connect a ground-referenced signal source to
a channel on a DAQCard configured in DIFF input mode.
ACH<0..7>
ACH<8..15>
Input Multiplexers
AISENSE
AIGND
Selected Channel in DIFF Configuration
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 DAQCard ground, shown as V
4-15
Chapter 4 Signal Connections
Instrumentation
Amplifier
+
PGIA
+
Measured
- V
m
Voltage
-
in Figure 4-4.
cm
DAQCard E Series User Manual