National Instruments NI 784xR User Manual page 30

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