(Sorry if this is a repost but it didn't show up on my end, the other day)
0.1 ohm 0.01% resistors seem a bit thin on the ground, so I was thinking:
And:
Idea is to take a square of copper-clad and Dremel a line down the middle, mount the resistors, and then drill out holes and solder on the banana jacks in the appropriate spots for a given piece of equipment's terminals, and shove the sumbitch on there when needed.
I don't have any mount-able male bananas on hand yet but I experimented with ten of the 1206 1 ohms in parallel as described, in theory the tolerance improves by sqrt(n) where n = 10.
Verifying if it actually does pushes the limits of my available equipment but my recently-calibrated 3478A in the 4 wire connection, after the copper-clad is thoroughly scrubbed clean before clipping the leads and after the HP warms up for a half-hour and settles down, seems to be telling me the resulting R is probably good enough for 0.03% rock and roll:
But whether it's 0.0999, 0.1000, or 0.1001 this meter cannot decide.
Any construction tips for the next revision? the "prototype" is about an inch on a side with the Rs about evenly spaced, and kinda crudely solder-blobbed on each side bridging the gap but maybe it'd be better to mount them some other way or make the board they're attached to bigger or smaller