Op-Amp voltage to current converter
Looks good. Just remember that a negative Vin will result in a positive output to P2 in an attempt to keep the op-amp (-) pin the same as the grounded (+) pin.

So a positive voltage into Vin would do just the opposite. Op-amps always try to keep both inputs at the exact same potential, so make sure your 'DUT' can handle voltage in both directions, and its resistance match's 'R' or is not to far from it.

If the DUT has a high resistance the op-amp will have substantial gain-it may saturate to the + or - rail in an attempt to keep the inputs at the same potential.

I do not think you will use more than +/- 15 volts to power the op-amp, so as long as the DUT can tolerate that voltage you are safe to experiment. Keep 'R' above 2K ohms to limit the current into the DUT and within safe levels the op-amp can handle (+/- 5 mA max load).