National Instruments Network Device DAQ S - Manual (Page 35)

Chapter 4 Analog Input
NI 6124/6154 User Manual 4-8 ni.com
Figure 4-3. Differential Connection for Ground-Referenced Signals
on Non-Isolated Devices
Figure 4-4 shows how to connect a ground-referenced signal source to a
channel on an isolated S Series device.
Figure 4-4. Differential Connection for Ground-Referenced Signals
on Isolated Devices
Ground-
Referenced
Signal
Source
Common-
Mode Noise
and Ground
Potential
V
s
V
cm
+
–
+
–
I/O Connector
AI 0 Connections Shown
AI 0 GND
AI 0–
AI 0+
+
–
+
–
V
m
Measured
Voltage
Instrumentation
Amplifier
Non-Isolated S Series Device
Ground-
Referenced
Signal
Source
Common-
Mode Noise
and Ground
Potential
V
s
V
cm
+
–
+
–
I/O Connector
AI 0 Connections Shown
AI 0–
AI 0+
+
–
+
–
V
m
Measured
Voltage
Instrumentation
Amplifier
Isolated S Series Device
Digital
Isolators
Isolation
Barrier