Chapter 4 Signal ConnectionsPCI-6023E/6024E/6025E User Manual4-18 ©National Instruments CorporationSingle-Ended Connections for Floating SignalSources (RSE Configuration)Figure 4-7 shows how to connect a floating signal source to a channelconfigured for RSE mode.Figure 4-7. Single-Ended Input Connections for Nonreferenced or Floating SignalsSingle-Ended Connections for Grounded SignalSources (NRSE Configuration)To measure a grounded signal source with a single-ended configuration,you must configure your board in the NRSE input configuration. The signalis then connected to the positive input of the PCI E Series PGIA, and thesignal local ground reference is connected to the negative input of thePGIA. The ground point of the signal should, therefore, be connected to theAISENSE pin. Any potential difference between the board ground and thesignal ground appears as a common-mode signal at both the positive andnegative inputs of the PGIA, and this difference is rejected by the amplifier.If the input circuitry of a board were referenced to ground, in this situationas in the RSE input configuration, this difference in ground potentialswould appear as an error in the measured voltage.Vs+++---Vm MeasuredVoltageFloatingSignalSourceACHAIGNDI/O ConnectorAISENSESelected Channel in RSE ConfigurationPGIAInput MultiplexersProgrammable GainInstrumentation Amplifier