National Instruments USB-6001 User Manual page 14

Signal Sources and Recommended Input Configuration
Table 6 summarizes the recommended analog input mode(s) for floating signal sources and
ground-referenced signal sources.
Table 6. NI USB-6001/6002/6003 Analog Input Configuration
Analog Input Mode
Differential (DIFF)
Referenced
Single-Ended (RSE)
*
Refer to the Taking Differential Measurements
and software considerations.
†
Refer to the Ground-Referenced Signal Sources
14 | ni.com | NI USB-6001/6002/6003 User Guide
*
Floating Signal Source
(Not Connected to
Building Ground)
Examples:
• Ungrounded
thermocouples
• Signal conditioning with
isolated outputs
• Battery devices
Signal Source
+
–
Signal Source
+
–
Signal Source Type
Example:
• Plug-in instruments with
DAQ Device
Signal Source
AI+
+
AI–
–
AI GND
DAQ Device
Signal Source
AI
+
–
V
A
AI GND
Ground-loop potential (V
section for descriptions of the RSE and DIFF modes
section for more information.
Ground-Referenced
Signal Source
non-isolated outputs
DAQ Device
AI+
+
AI–
–
AI GND
V
cm
DAQ Device
AI
+
–
AI GND
V
B
– V
A B
to measured signal.
†
+
–
+
–
) are added