© National Instruments Corporation 11 NI USB-9234 User Guide and Specifications
Wiring the NI USB-9234
The NI USB-9234 has four BNC connectors that provide connections to
four simultaneously sampled analog input channels. Each channel has a
BNC connector to which you can connect a signal source. You can also
enable excitation current on a per-channel basis to connect Integrated
Electronic Piezoelectric (IEPE) sensors. The center pin of the connector,
AI+, provides the DC signal connection. The shell of the connector, AI–,
provides the excitation return path and AC signal ground reference. Refer
to Figure 6 for the connector assignments for each channel.
Figure 6. NI USB-9234 Connector Assignments
AI3+
AI3–
AI2+
AI2–
AI0+
AI0–
AI1+
AI1–