©
National Instruments Corp.
5
FP-AI-112 and cFP-AI-112
Caution
Cascading power between two modules defeats
isolation between those modules. Cascading power from
the network module defeats all isolation between
modules in the FieldPoint bank.
Measuring Voltage with the [c]FP-AI-112
Figure 3 shows how to connect a voltage source without an
external power supply to one channel of the [c]FP-AI-112.
Figure 3.
Voltage Source without External Power Supply
Figure 4 shows how to connect a voltage source with an external
power supply to one channel of the [c]FP-AI-112.
Figure 4.
Voltage Source with External Power Supply
V
SUP
V
IN
V
C
>
100 M
Ω
Input
Impedance
COM
[c]FP-AI-112
Voltage
Source
+
–
Input
Circuitry
V
SUP
V
IN
V
C
>
100 M
Ω
Input
Impedance
COM
[c]FP-AI-112
Input
Circuitry
Powered
Voltage
Transducer
OUT
+
–
+
–
External
Power Supply
(Optional)
2 A
Max
