Chapter 4 Signal Connections
National Instruments Corporation
4-13
VXI-MIO Series User Manual
Figure 4-3 summarizes the recommended input configuration for both
types of signal sources.
Figure 4-3.
Summary of Analog Input Connections
Input
Differential
(DIFF)
Referenced
Single-Ended
Ground
(RSE)
Nonreferenced
Single-Ended
(NRSE)
Floating Signal Source
(Not Connected to Earth Ground)
Grounded Signal Source
Examples
• Ungrounded thermocouples
• Signal conditioning with isolated outputs
• Battery devices
Examples
• Plug-in instruments with
nonisolated outputs
+
-
+
-
V
1
ACH(+)
+
-
+
-
V
1
ACH(+)
ACH (-)
See text for information on bias resistors.
See text for information on bias resistors.
R
Signal Source Type
ACH (-)
AIGND
+
-
+
-
V
1
ACH
AIGND
+
-
+
-
NOT RECOMMENDED
ACH
+ V
g
-
V
1
Ground-loop losses, V
g
, are added to
measured signal
+
-
+
-
V
1
ACH
AISENSE
R
AIGND
+
-
+
-
V
1
ACH
AISENSE
AIGND
AIGND
