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Chapter 4
Signal Connections
Ground-
Referenced
Signal
Source
Common-
Mode
Noise
and Ground
Potential
I/O Connector
Common-Mode Signal Rejection Considerations
AT-MIO/AI E Series User Manual
Figure 4-9 shows how to connect a grounded signal source to an
AT E Series board channel configured for NRSE mode.
+
V
s
-
Input Multiplexers
+
AIGND
V
cm
-
Selected Channel in NRSE Configuration
Figure 4-9. Single-Ended Input Connections for Ground-Referenced Signal
Figures 4-6 and 4-9 show connections for signal sources that are
already referenced to some ground point with respect to the
AT E Series 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 +
and V -
in
AT-MIO-16XE-50 has the additional restriction that (V +
to the gain times (V +
of 10 and 100, this is roughly equivalent to restricting the two input
voltages to within 8 V of AIGND.
ACH<0..15>
AISENSE
are both within 11 V of AIGND. The
in
- V -
) must be within 26 V of AIGND. At gains
in
in
4-26
Instrumentation
Amplifier
+
PGIA
+
Measured
V
-
m
-
+ V -
in
National Instruments Corporation
Voltage
) added
in
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