Well, the fixture that comes with the analyzer is configured for measuring quad op amps of some sort. I suspect that there's some sleight of hand going on inside the fixture that allows it to be used with the basic analyzer (there's switches and a knob, as well as a zif socket for the UUT). What I'll be mostly needing is information on how to use the analyzer and how to hook into the ribbon cable connectors on the back side of the analyzer, which I suppose would be the connection to whatever fixture is used with the main box. If I'm spouting doo-doo here and another major piece is needed, let me know. What I'm getting is the box with the displays, and a separate fixture built into a slope-front box.