National Instruments SCXI-1126, User Manual, Page: 33 / 61

Chapter 2 Using the SCXI-1126
SCXI-1126 User Manual 2-2 ni.com
Figure 2-1. Ground-Referenced Signal Connection for the SCXI-1126 with
High Common-Mode Voltage
Figure 2-2. Floating Signal Connection for the SCXI-1126 Referenced to
Chassis Ground for Better Signal-to-Noise Ratio
Caution Adding the bias resistor (R
bias
), shown in Figure 2-2, breaks the isolation barrier.
+
–
+
F – V
+
–
CH–
CH+
Analog
Ground
Isolated
Ground
SCXI-1126 Module SCXI Terminal Block Sensor
High
CMV
V
cm
F
s
V
out
+
–
+
F – V
CH–
CH+
Analog
Ground
Isolated
Ground
SCXI-1126 Module SCXI Terminal Block Sensor
F
s
V
out
R
bias
CHSGND
Optional