Advantech PCI-1710 Instrukcja Użytkownika Pobierz pdf (Strona 24)

20 PCI-1710/1710HG User's Manual

Figure 3-2: Single-ended input channel connection

Differential Channel Connections

The differential input configuration has two signal wires for each

channel, and the differential input responds only to voltage differenc-

es between High and Low inputs. On the PCI-1710/1710HG card, when

all channels are configured to differential input, up to 8 analog

channels are available.

If one side of the signal source is connected to a local ground, the

signal source is ground-referenced. The ground of the signal source

and the ground of the PCI-1710/1710HG will not be at exactly the same

voltage, as they are connected through the ground return of the

equipment and building wiring. The difference between the ground

voltages forms a common-mode voltage (V

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

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

3-3 shows a differential channel connection between a ground-

reference signal source and an input channel on the PCI-1710/1710HG

ExternalInternal

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