Chapter4 ConnectingSignals
©NationalInstruments Corporation 4-9 NI6013/6014 User Manual

setting ofthe amplifier. The amplifier output voltage is referenced to the

deviceground. The deviceADC measures this outp ut voltagewhen it

performs A/D conversions.

Connecting Analog Input Signals

The following sections discuss the use of single-ended and differential

measurements andmake recommendations for measuring both floating

and ground-referenced signal sources.

Figure 4-3 summarizes the recommended input configuration for both

types of signal sources.

Figure4-3. Summary of AI Connections

Input
Input
FloatingSignal Source
(NotConnected to Building Ground) GroundedSignal Source
Differential
(DIFF)
Single-Ended—
Nonreferenced
(NRSE)
Examples
•UngroundedThermocouples
•SignalConditioning with
IsolatedOutputs
•BatteryDevices
Example
•Plug-inInstruments with Nonisolated
Outputs
+
–
+
–
V1
ACH
AISENSE
AIGND
+
–
+
–
V1
ACH(+)
ACH(–)
AIGND
+
–
+
–
V1
ACH(+)
ACH(–)
AIGND
R
Seetext for information on bias resistors.
+
–
+
–
V1
ACH
AISENSE
AIGND
R