But if you just want to ramp up your inputs and watch them with meters and/or scopes...
Stable 10 volt supply, 8, 2K pots, 4,400 ohm resistors.
4-20mA with 100 ohm load:
Place 400 ohm resistor in series with 2000 ohm pot in series with the load. Tie the wiper of the pot to one end so clockwise rotation reduces resistance. Place the series network across the 10 Volt supply.
0-10V with 300 ohm load:
Place ends of pot directly across 10 Volt Supply. Run wiper to top of load, bottom of load to negative of pot and PS.
Maximum PS load = (4 x 20 mA) + (4 X (10/2000)) + (4 x 10/300) = 80 + 20 + 133 = 233 mA. So a 10V, 250mA supply would be enough if all pots were full clockwise.
Joe
[This message has been edited by JoeTestingEngr (edited 08-02-2006).]
