National Instruments Data Acquisition Device E Series User Manual page 54

Input
Differential (DIFF)
Single-Ended—
Ground Referenced
(RSE)
Single-Ended—
Non-Referenced
(NRSE)
© National Instruments Corporation
Table 2-6. Recommended Input Configurations
Floating Signal Sources
(Not Connect To Building
Ground)
Examples
• Ungrounded thermocouples
• Signal conditioning with
isolated outputs
• Battery devices
AI +
+
V s
AI –
–
R
ext
AI GND
AI
+
V
s
AI GND
–
AI
+
V
s
AI SENSE
–
R
ext
AI GND
Refer to the Analog Input Terminal Configuration
of the input modes.
Signal Source Type
Ground-Referenced Signal
Examples
• Plug-in instruments
with non-isolated outputs
+
–
+
–
Ground-loop losses, V g , are added
+
–
AI GND
2-21
Chapter 2 Analog Input
Sources
AI +
+
+
V
s
AI –
–
–
AI GND
NOT RECOMMENDED
AI
+
+
V
1
–
–
+ V –
g
AI GND
to measured signal.
AI
+
+
V s
AI SENSE
–
–
AI GND
section for descriptions
E Series User Manual