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Configuration and Installation
Ground-
+
Reference
V
s
Signal
-
Source
+
Common-
V
Mode Noise
cm
and So On
-
MIO-16 I/O Connector
Figure 2-30. Single-Ended Input Connections for Grounded Signal Sources
Common-Mode Signal Rejection Considerations
Figures 2-27 and 2-30, located earlier in this chapter, show connections for signal sources that are
already referenced to some ground point with respect to the AT-MIO-16D. In these cases, the
instrumentation amplifier can reject any voltage due to ground potential differences between the
signal source and the AT-MIO-16D. In addition, with differential input connections, the
instrumentation amplifier can reject common-mode noise pickup in the leads connecting the signal
sources to the AT-MIO-16D.
The common-mode input range of the AT-MIO-16D instrumentation amplifier is defined as the
magnitude of the greatest common-mode signal that can be rejected.
The common-mode input range for the AT-MIO-16D depends on the size of the differential input
= V +
- V -
signal (V
diff
in
formula for the allowed common-mode input range is as follows:
where the maximum value for V
±10 V range
0 to +10 V range
±5 V range
AT-MIO-16D User Manual
ACH<0..15>
3
5
7
18
Input Multiplexer
19
1-2
AI GND
AT-MIO-16D Board in NRSE Input Configuration
) and the gain setting of the instrumentation amplifier. The exact
in
= ± (12 V -
V
cm-max
is as follows:
diff
= ±10 V
V
diff-max
V
= 10 V
diff-max
= ±5 V
V
diff-max
+
-
AI SENSE
V
* Gain
diff
)
2
2-32
© National Instruments Corporation
Chapter 2
Instrumentation
Amplifier
+
Measured
V
m
Voltage
-
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