Thank you, this is what I call just in time delivery. Two days ago I managed to repair a HP 4155A, lucky me it was only the power supply, and now I'm looking into acquiring triaxial cables and build some sort of fixture to connect the devices under test. Your example setup will certainly make it easier for me to start experimenting.
I understand the 6024A is an external power supply that can be controlled with an analog voltage, VS from SMU1. Somehow it provides a 12x higher voltage at its output (your multiplication to calculate VCE). How is this 12x factor defined?
A4 must represent an output of the 6024A that is in relation with the current on its output. You measure this A4 voltage with SMU-3 and multiply it by 2 to have the collector current IC. How did you identify this 2x factor?
I guess these '12x' and '2x' have something to do with how the power supply works, but as this is a completely analog device I don't know for sure.
