Advantech USB-4711A handleiding
Handleiding
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11 USB-4711A User Manual
Chapter 3 Signal Connections
3.3.2 Differential Input Connections
The differential input channels operate with two signal wires for each channel, and
the voltage difference between both signal wires is measured. On USB-4711A, when
all channels are configured to the 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 3-3 shows a differential channel
connection between a grounded-reference signal source and an input channel on
USB-4711A. With this connection, the PGIA rejects a common-mode voltage Vcm
between the signal source and USB-4711A ground, shown as Vcm in Figure 3.3.
Figure 3.3 Differential Input Channel Connection
Note! In differential input mode, the input channel n should be used with chan-
nel n+1.
(n=0,2,4…14)
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Productinformatie
| Merk | Advantech |
| Model | USB-4711A |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 1754 MB |
