©
National Instruments Corp.
11
NI 9215 Operating Instructions and Specifications
Connecting Differential Voltage Signals to the NI 9215
Yo
u
can connect gro
u
nded or floating differential signals to the
NI 9215. Connect the positive voltage signal to AI+ and the
negative voltage signal to AI–. To connect gro
u
nded differential
signals to the NI 9215 with screw terminal, yo
u
m
u
st also connect
the signal reference to the COM terminal, as shown in Fig
u
Figure 4.
Connecting a Grounded Differential Voltage Signal to
the NI 9215 with Screw Terminal
Voltage
Source
+
–
AI+
AI–
COM
NI 9215 with
Screw Terminal
