Chapter4 ConnectingSignals
NI6013/6014 User Man ual 4-16 ni.com
Figure 4-7 showshow to connect a grounded signal source to a channel
configuredfor NRSE mode on the NI6 013/6014.
Figure 4-7. Single-EndedInput Connections for Ground-Referenced Signals
Common-Mode Signal Rejection Considerations
Figures 4-4 and 4-7 show connections for signal sources that are
already referencedt o some ground point with respect to the NI 6013/6014.
Inthese cases, the PGIA can reject any voltage caused by ground potential
differencesbetween the signal source and the device. In addition, with
differentialinput c onnections,the PGIA canreject common-mode noise
pickup in the leads connecting the signal sources to the device. The PGIA
can rejectcommon-mode signalsas long as Vin +and Vin–(input signals)
are both within ±11 V of AIGND.
SelectedChannel in NRSE Configuration
Common-
Mode
Noise
andGround
Potential
Ground-
Referenced
Signal
Source PGIA
InputMultiplexers
–
+
–
+
Vs
Vcm
I/OConnector
AIGND
AISENSE
ACH<0..15>
–
+
Instrumentation
Amplifier
Measured
Voltage
Vm
–
+