Fig. 3-3: Differential Input Channel Connection - Ground Reference Signal - Advantech MIC-3716 Manual

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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 MIC-3716. With this

connection, the PGIA rejects a common-mode voltage V

between the

signal source and the MIC-3716 ground, shown as V

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 against the AIGND.

Fig. 3-4 shows a differential channel connection between a floating

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