I got several inquiries when I mentioned I did a 5200A extender cable. I didn't like my solution since it uses ribbon cables and there is +/- (300V?) on some of the slots which is pushing what a ribbon cable can do, although it did pass a test with a 1000V insulation tester. There is a guy on Ebay (seller sparko6079, ham call sign WA1ESO) selling Fluke 5200A extender boards: http://www.ebay.com/itm/Fluke-5200A-Programmable-AC-Calibrator-Extender-Board-Riser-KIT-FORM-/222653463018? Apparently he makes them on a CNC machine and will make any extender card format you need. His Ebay listing shows numerous extenders for HP/TEK/etc devices.