Advantech PCI-1720 Manuale Utente Pagina 20

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16 PCI-1720 User's Manual
If a floating signal source is connected to the differential input
channel, the signal source may 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 to
the AIGND.
Figure 3-4 shows a differential channel connection between a floating
signal source and an input channel on the PCI-1713 card. In this
figure, each side of the floating signal source is connected through a
resistor to the AIGND. This connection can reject the common-mode
voltage between the signal source and the PCI-1713 card ground.
Figure 3-4: Differential input channel connection- floating signal source
r
a
r
b
ExternalInternal
Multi
p
lexer
Multi
p
lexer
AI1
AI3
AI31
AI0
AI2
AI30
Floatin
Si
nal
Source
Measured
Volta
g
e
GND
_
+
PGIA
_
+
I/O Connector
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