Advantech PCI-1710 Manual do Utilizador descarregar pdf (Página 25)

Chapter 3 Signal Connections 21

card. With this connection, the PGIA rejects a common-mode voltage

between the signal source and the PCI-1710/1710HG ground,

shown as V

in Figure 3-3.

Figure 3-3: Differential input channel connection - ground reference signal source

If a floating signal source is connected to the differential input

channel, the signal source may exceed the common-mode signal range

of the PGIA, and the PGIA will be saturated with erroneous voltage-

readings. You must therefore reference the signal source to the

AIGND.

Figure 3-4 shows a differential channel connection between a floating

signal source and an input channel on the PCI-1710/1710HG card. In

this figure, each side of the floating signal source is connected

through a resistor to the AIGND. This connection can reject the

common-mode voltage between the signal source and the PCI-1710/

1710HG card ground.

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