Advantech PCI-1710HG Dokumentacja Pobierz pdf (Strona 53)

To avoid the ground loop noise effect caused by common-mode

voltages, you can connect the signal ground to the Low input.

Fig. 3-3 shows a differential channel connection between a

ground-reference signal source and an input channel on the

PCI-1710/1710L/1710HG/1710HGL/1716/1716L. With this

connection, the PGIA rejects a common-mode voltage V cm between

the signal source and the PCI-1710/1710L/1710HG/1710HGL/1716/

1716L ground, shown as V cm in Fig. 3-3.

Fig. 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 might 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

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Advantech PCI-1710HG Dokumentacja Strona 53