I assume that the newer 57x curve tracers use cam switches for selecting voltage and current ranges, and I think I understand how Tek piggybacked readout onto those cam switches (by reading the position of the cams from the opposite side). I've never worked with older style wafer switches (though I've got a type A plug-in that needs it's waver switches repaired, but it's far down on the list of projects), so I don't know how difficult it would be to add readout detection to one of them.
While you are collecting X and Y data it would be useful to know the setting of the other front-panel controls. The pots could be sampled directly (I think) but sampling the positions of the selector switches will require some mechanical retrofitting.
-- Jeff Dutky
