21 PCIE-1816_1816H User Manual
Chapter 3 Signal Connections
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 sig-
nal source against the AGND.
Figure 3-5 shows a differential channel connection between a floating signal source
and an input channel on the PCI-1816/1816H. In this figure, each side of the floating
signal source is connected through a resistor to the AGND. This connection can
reject the common-mode voltage between the signal source and the PCI-1816/
1816H ground.
Figure 3.5 Differential input channel connection - floating signal source
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