Differential Channel Connections - Advantech MIC-1810 User Manual

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3.8.1

Differential Channel Connections

The differential input channels operate with two signal wires for each channel, and

the voltage difference between both signal wires is measured. On MIC-1810, when

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

able.

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

ground-referenced. Therefore, the ground of the signal source and the ground of the

card will not be exactly of the same voltage. The difference between the ground volt-

ages forms a common-mode voltage (Vcm ).

To avoid the ground loop noise effect caused by common-mode voltages, you can

connect the signal ground to the Low input. Figure 3.7 shows a differential channel

connection between a ground reference signal source and an input channel on the

MIC-1810. With this connection, the PGIA rejects a common-mode voltage Vcm

between the signal source and the MIC-1810 ground, shown as Vcm in Figure 3.7.

MIC-1810 User Manual

Figure 3.7 Differential input channel connections

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