National Instruments Isolated Analog Input Device NI PXI-4224 - Manual (Page 23)

Chapter 2 Connecting Signals
© National Instruments Corporation 2-11 NI PXI-4224 User Manual
Figure 2-9. Shielded Grounded Signal Source Connection Using a Terminal Block
Floating Signal Source Connection
Figures 2-2, 2-4, 2-6, and 2-8 illustrate floating signal source connections.
In this configuration, the signal source being measured is a floating signal
source, such as a battery. A floating signal source is not connected in
any way to the building ground system.
To connect a floating signal source connection to the NI PXI-4224, the
signal (V
SIG
+) is connected to the NI PXI-4224 channel (AI X +). The
signal reference (V
SIG
–) is connected to the channel reference (AI X –).
Twisted-Pair
Wiring
AI 0 +
AI 0 –
CH 0
Terminal Block
AI 7 +
AI 7 –
CH 7
Shielding
+
–
V
SIG
V
SIG
Ground
Reference
Signal Source