National Instruments AT E Series Single-Ended Connections for Floating Signal Sources (RSE Configuration), Single-Ended Connections for Grounded Signal Sources (NRSE Configuration)

Chapter4 ConnectingSignals

©NationalInstruments Corporation 4-25 ATE Series User Manual

Single-Ended Connections for Floating SignalSources (RSE Configuration)

Figure 4-8 shows how to connect a floating signal source to an AT E Series

device channel configured for RSE mode.

Figure4-8. Single-Ended Input Connections for Nonreferenced or Floating Signals

Single-Ended Connections for Grounded SignalSources (NRSE Configuration)

To measurea groun ded signal source with a single-ended configuration,

you must configure the AT E Series device in the NRSE input

configuration. The signal is then connected to the positive input of the

AT E Series PGIA, and the signal local ground reference is connected to

the negative input of the PGIA. The ground point of the signal should,

therefore,be connected to the AISENSE pin. Any potential difference

between the AT E Series 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 an

AT E Series device werereferenced to ground, in this situation as in the

RSEinput configuration, this difference in ground potentials would a ppear

asan error in the measured voltage.

SelectedChannel in RSE Configuration

PGIA

InputMultiplexers

ProgrammableGain

InstrumentationAmplifier

–

AISENSE

AIGND

I/OConnector

–

ACH

Floating

Signal

Source

Measured

Voltage