Advantech PCI-1713, User Manual

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1 4 PCI-1720 User's Manual
3.3 Analog Input Connections
This section continues to describe how to make analog input signal
connections to the PCI-1713 card via the I/O connector.
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 referred to 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-1713 card 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-1713 card.
Figure 3-2: Single-ended input channel connection
External Internal
F lo a tin g
S ig n a l
S o u rc e
+
_
V s
M u ltip le xe rs
A I3 1
A I1
A I0
P G IA
_
+
+
_
V m
M e a s u re d
V o lta g e
I/O C o n n e c to r
G N D