National Instruments PXI-7811 User Manual page 28

Figure 2-5 summarizes the recommended input mode for both types of
signal sources.
(Not Connected to Building Ground)
Input
Differential
(DIFF)
See text for information on bias resistors.
Single-Ended—
Ground
Referenced
(RSE)
Single-Ended—
Nonreferenced
(NRSE)
See text for information on bias resistors.
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Signal Source Type
Floating Signal Source
Examples
• Ungrounded Thermocouples
• Signal Conditioning with
Isolated Outputs
• Battery Devices
AI<i>(+)
+
+
V
1
– AI<i>(–)
–
AIGND<i>
AI<i>
+
+
V
1
– AIGND<i>
–
AI<i>
+
+
V
1
–
AISENSE
–
AIGND<i>
Figure 2-5. Summary of Analog Input Connections
2-9
Chapter 2 Hardware Overview of the NI 78xxR
Grounded Signal Source
Examples
• Plug-in Instruments with
Nonisolated Outputs
AI<i>(+)
+
+
V
1
– AI<i>(–)
–
AIGND<i>
NOT RECOMMENDED
AI
+
+
V
1
–
–
+ V –
g
AIGND
Ground-loop losses, V , are added to
g
measured signal.
AI<i>
+
+
V
1
–
AISENSE
–
AIGND<i>
R Series Multifunction RIO User Manual