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You could use a FieldPoint Input module to measure a voltage and an output module to output a current. For example you could use the the [c]FP-AI-100/102/110/112 or [c]FP-AIO-600 modules to measure voltages and either the FP-AO-200 or cFP-AIO-600 to output currents.
If you are interested in specifically how the FieldPoint unit converts
voltage to current, it is as easy as V=I*R. All the unit has to
do is output a voltage across a precision resistor to get current.
Andy F.
Applications Engineer
National Instruments
----------------------------------------------------------------- National Instruments
