© 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

Figure3 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

Figure4 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 PowerSupply
V
SUP
V
IN
VC
>100 MΩ
Input
Impedance
COM
[c]FP-AI-112
Voltage
Source

+

–

Input
Circuitry
VSUP
VIN
VC
>100 MΩ
Input
Impedance
COM
[c]FP-AI-112
Input
Circuitry
Powered
Voltage
Transducer
OUT

+

–

+
–
External
Power Supply
(Optional)
2 A
Max