ADLINK PCI-9524 - Manual (Page 52)

36 Signal Connections
PCI-9524 ADLINK Technology Inc.
User’s Manual Copyright 2008
Figure 3-6: Connecting to a four-terminal load-cell transducer
using a six-wire connection
+Vex
+Vo
-Vex
-Vo
AIn+
AIn-
VEXn+
VEX_SENn+
VEXn-
VEX_SENn-
NC
NC
Load-cell Transducer PCI-9524
Differential input mode for general purpose input channels
AI channels 4 to 7 are designed for connecting to ground-refer-
enced or floating sources in differential mode.
The differential input mode provides two inputs that respond to sig-
nal voltage difference between them. If the signal source is
ground-referenced, the differential mode can be used for the com-
mon-mode noise rejection. Figure 3-7 presents an example of
ground-referenced signal source connections under differential
input mode.
Figure 3-7: Ground-referenced source and differential input
AIn+
AIn-
n = 4, ..., 7
Ground
Referenced
Signal
Source
To A/D
Converter
AIGND
+
-
Instrumentation
Amplifier
V
cm
Common-
mode noise &
Ground
potential
+
-
Input Multipexer