© National Instruments Corp. 11 NI 9215 Operating Instructions and Specifications
Connecting Differential Voltage Signals to the NI 9215
You can connect grounded or floating differential signals to the
NI9215. Connect the positive voltage signal to AI+ and the
negative voltage signal to AI–. To connect grounded differential
signals to the NI9215 with screw terminal, you must also connect
the signal reference to the COM terminal, as shown in Figure4.
Figure 4. Connecting a Grounded Differential Voltage Signal to
theNI 9215 with Screw Terminal
Voltage
Source
+
–
AI+
AI–
COM NI 9215 with
Screw Terminal