5540 National Instruments

5540     National Instruments   Interface Terminal

VSIG is the voltage difference between AI<0..7>+ and AI<0..7>-. This is the desired signal 

to be measured. VCM is the common-mode voltage with respect to the AI isolated ground, 

COM<0..7>, calculated by subtracting COM<0..7> from AI<0..7>-. VISO is the isolation voltage 

with respect to the chassis ground of the measurement device.

The analog input channels are floating with respect to chassis ground and each other. If you make 

a ground-referenced connection between the signal source and the PXIe-4310 input, make sure 

the voltage on the AI+, AI-, and COM connections are within the safety voltage limits to ensure 

safe operation. Refer to the PXIe-4310 Specifications for more information about Safety 

Voltages.

The COM terminal for each channel must be connected to the reference ground of the AI source. 

Failure to connect COM results in inaccurate measurements. You can connect the COM terminal 

directly to the negative terminal of the source as shown in Figure 2-2 or to an isolated ground of 

the source as long as the working voltage specification of the PXIe-4310 is not violated.

To ensure the specified EMC performance, wire the AI+ and AI- signals as twisted pairs and use 

the COM as a shield. The COM connection should be made as close to the source as possible to 

take advantage of the differential nature of this device.

PXI-6120     PXI-6289   PXIE-7961R   PCI-8517   PXI-2545   PXI-7952R    PXI-6723

PCI-6031E   PXIE-7962R    CDAQ-9171   PXIE-1095   PCI-4474     PXI-6115

PXI-2596    PXI-6515    PCIE-8381   PXIE-1082   PXIE-8135    PXIE-7976R

NI-5791   PXI-6224   CDAQ-9181   PXI-2597    PCI-6224     PXI-8331

NI-9250    PXI-6238   PXIE-6358

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