How can I get the voltage on a current source (I=0 A) using abm voltage?

HI, I'd like to export in Vout the voltage Vin using an ABM voltage source (see the picture below).
I don't want to use a nonlinear dependant source because I'm working with voltages of about 1 pV and nonlinear dependant sources degrade the results because of their input impedances (1 GOhms).
Thanks,

to reference voltages using the ABM sources, use the V(nodename) syntax. 
So in your case, assuming the nodes on the left are IO1 and IO2, the expression would be "V(IO1)-V(IO2)", without the quotes
Max
National Instruments

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