There is no easy way to do this.Probably the best way is to wire the + end of the pot to a PNP transistor then to +ve and only switch on the current to that pot while you make the measurement. In that way there is only one pot connected at any one time and only breafely at that.
How about putting a high-side resistor on the pots such that they form a voltage divider with approx 1v at the junction. Then use the internal 1v1 reference.______Rob
That's still 10mA per pot - is it small enough?
is that one 360 ohm resistor per pot or one for all four?
Is a resistor fine to cope with 40mA?
That's the tyranny of an iPad for you.