Advantech USB-4716 200 kS/s, 16-bit, 16-Channel Multifunction USB Module USB-4716-AE Scheda Tecnica

The differential input channels operate with two signal wires for each 
channel, and the voltage difference between both signal wires is mea-
sured. On USB-4716, 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. 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 voltages forms a commonmode voltage 
(V

cm 

).

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 grounded-reference signal 
source and an input channel on USB-4716. With this connection, the 
PGIA rejects a common-mode voltage V

cm 

between the signal source and 

USB-4716 ground, shown as V

cm 

in Figure 3-3.

Note: In differential input mode, the input channel n should be used with 

channel n+1.

(n=0,2,4…14)