Connecting Analog Input Signals - National Instruments M Series User Manual

Connecting Analog Input Signals

Table 4-3 summarizes the recommended input configuration for both types of signal sources.
Examples:
•
•
AI
Ground-Reference
*
Setting •
Differential (DIFF)
Signal Source
Non-Referenced
Signal Source
Single-Ended
(NRSE)
Referenced
Signal Source
Single-Ended (RSE)
Analog Input Ground-Reference Settings
*
Refer to the
DIFF modes and software considerations.
Connecting Ground-Referenced Signal Sources
†
Refer to the
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Table 4-3. Analog Input Configuration
Floating Signal Sources
(Not Connected to
Building Ground)
Ungrounded thermocouples
Signal conditioning with isolated
outputs
Battery devices
DAQ Device
AI+
+
+
– AI–
–
AI GND
DAQ Device
AI
+
+
–
–
AI SENSE
AI GND
DAQ Device
AI
+
+
–
–
AI GND
section for descriptions of the RSE, NRSE, and
section for more information.
M Series User Manual
Ground-Referenced
†
Signal Sources
Example:
• Plug-in instruments with
non-isolated outputs
Signal Source DAQ Device
AI+
+
+
– AI–
–
AI GND
Signal Source DAQ Device
AI
+
+
–
–
AI SENSE
AI GND
NOT RECOMMENDED
Signal Source DAQ Device
AI
+
+
–
–
V
A
V
B
AI GND
Ground-loop potential (V – V ) are added
A B
to measured signal.
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