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Chapter 3
– 24 –PCI-1712/1712L User’s Manual
Advantech Co., Ltd.
www.advantech.com
3.3 Analog Input Connections
The PCI-1712/1712L supports either 16 single-ended or 8 differential
analog inputs. Each individual input channel is software-selected.
Single-ended Channel Connections
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.
Figure 3-2: Single-ended input channel connection
Differential Channel Connections
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