National Instruments 6023E, 6024E, 6025E Single-Ended Connections for Floating Signal Sources (RSE Configuration), Single-Ended Connections for Grounded Signal Sources (NRSE Configuration)

Chapter4 SignalConnections
6023E/6024E/6025EUser Manual 4-18 ni.com
Single-Ended Connections for Floating Signal
Sources (RSE Configuration)
Figure 4-7 shows how to connect a floating signal source to a channel
configured for RSE mode.
Figure4-7. Single-EndedInput Connections for Nonreferenced or Floating Signals
Single-Ended Connections for Grounded Signal
Sources (NRSE Configuration)
To measurea groun ded signal source with a single-ended configuration,
youmust configure your device in the NRSE inpu t configuration. Connect
the signal to the positive input of the PGIA, and connect the signal local
groundreference to the negative input of the PGIA. The ground point of the
signal, therefore, connects to the AISENSE pin. Any potential difference
between the device ground and the signal ground appears as a
common-modesignal at both the posi tive and negative inputs of the PGIA,
and thisdifference is rejected by the amplifier. If the input circuitry of a
device were referenced to ground, in this situation as in the RSE input
configuration,this difference in ground potentials appears as an error in the
measured voltage.
+
+
+
–
–
–
Measured
Voltage
AIGND
I/OConnector
AISENSE
SelectedChannel in RSE Configuration
PGIA
InputMultiplexers
Vs
Vm
ProgrammableGain
InstrumentationAmplifier
ACH
Floating
Signal
Source