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Chapter 3
The PCI-1712/1712L supports either 16 single-ended or 8 differential
analog inputs. Each individual input channel is software-selected.
The single-ended input configuration has only one signal wire for each
channel, and the measured voltage (Vm) is the voltage of the wire as
referenced against the common ground.
A signal source without a local ground is also called a "floating
source". It is fairly simple to connect a single-ended channel to a
floating signal source. In this mode, the PCI-1712/1712L provides a
reference ground for external floating signal sources.
Figure 3-2 shows a single-ended channel connection between a
floating signal source and an input channel on the PCI-1712/1712L.
The differential input channels operate with two signal wires for each
channel, and the voltage difference between both signal wires is
measured. On the PCI-1712/1712L, 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
PCI-1712/1712L User's Manual
Figure 3-2: Single-ended input channel connection
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– 24 –
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