Common-Mode Signal Rejection Considerations; Figure 4-8. Single-Ended Input Connections For Ground-Referenced Signals - National Instruments DAQ PCI-6023E User Manual

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

Common-Mode Signal Rejection Considerations

© National Instruments Corporation
Figure 4-8 shows how to connect a grounded signal source to a channel
configured for NRSE mode.
ACH+
+
-
ACH-
+
-
Input Multiplexers
AISENSE
AIGND
Selected Channel in DIFF Configuration

Figure 4-8. Single-Ended Input Connections for Ground-Referenced Signals

Figures 4-5 and 4-8 show connections for signal sources that are already
referenced to some ground point with respect to the board. In these cases,
the PGIA can reject any voltage caused by ground potential differences
between the signal source and the board. In addition, with differential input
connections, the PGIA can reject common-mode noise pickup in the leads
connecting the signal sources to the board. The PGIA can reject
common-mode signals as long as V+
within ±11 V of AIGND.
and V–
in
4-19
Chapter 4 Signal Connections
Programmable Gain
Instrumentation
Amplifier
+
PGIA
+
Measured
- V
m
Voltage
-
(input signals) are both
in
PCI-6023E/6024E/6025E User Manual