I'm building a decade resistance box using 2W resistors, from 10x1M ohm to 10x0.1 ohm. However, due to some contact resistance, the 0.1 to 1 ohm resistance will likely turn out to be ~1.1 ohm to 2 ohms (the rest of which will be in a tolerable margin of error). Is there a way I can 'offset' the ~1 ohm of wiper and contact resistance with some active components, with an adjustable potentiometer for fine tuning?
I'm thinking -1 ohm +/- 0.5 ohms ought to do, and ideally it would handle up to 2W just like the other resistors. Is such a circuit possible?