Euler,
The pot is two series resistors. When you run a sweep with one of the pot resistors as your variable, you're ONLY sweeping that resistor - the other resistor is fixed - you're not sweeping the wiper!
With the wiper set to 0%, your upper resistor is at 10kohm and lower resistor is 0ohms. Now as you sweep the lower resistor from 0ohm to 10kohm, you're getting a voltage divider with output 0V @ Rlower=0kohm and 10*(1/2)=5V @R=10kohm.
That's why I mentioned earlier that the pot's contents should not be used for parameter sweep.
Max
National Instruments
