Adlink ACL-8112 Series Manual do Utilizador descarregar pdf (Página 34)

26 • Signal Connections

AIHn

AILn

n = 0, ..., 8

Groun

Signal

Sourc

To A/D Converter

VG1 VG2

Vcm = VG1 - VG2

GND

+

-

Figure 3.5 Ground source and differential input

A differential mode must be used when the signal source is differential. A

differential source means the ends of the signal are not grounded. To avoid

dangerously high voltages between the local ground of the signal and the

ground of the PC system, a shorted ground path must be connected.

Figure 3.6 shows the connection for a differential source.

AIHn

AILn

n = 0, ..., 8

Differentia

Signal

Sourc

To A/D Converter

VG1 VG2

Vcm = VG1 - VG2

GND

+

-

Figure 3.6 Differential source and differential input

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