Really clean and nice. I like how you added sense lines to the DC load, and I love your "front-side connection station" for the Keithley 236 SMU. I may have to steal that idea. Can you show us your time and frequency stack?
Thanks, and to be honest this is a bit of a temporary setup until I get a garden workshop/office built. As for the rest of the gear just got a RTB2004 scope, a JDSU LTE Analyser (does spec-an duty, not used a lot though), a couple more PSUs in storage and a whole pile of smaller misc stuff.
RE the 236 connection box - I'm actually working on some similar ones for the 228A and a 66309D PSU I have (plus maybe one to breakout the 10A jack and some scanner connections on the DMM6500). Will share all once I'm done - they use some boxes from aliexpress and PCBs for panels, but note that the 236 breakout requires some significant investment, as it needs 3 triax cables and 4 panel mount triax jacks (there's a triax on the front of the box as well - a bit hidden in that pic). No issues with leakage of the safety bananas btw, and much more convenient being able to use normal test leads for quick use when best leakage performance or a shielded test fixture isn't needed.
The 236 is also actually now a 237 btw - I built a clone of the resonant converter board for the +/- 1200V supply and upgraded the output and analogue boards. This is quite a process with a few gotchas, and I really need to get around to finishing my write-up of the job.
The 228A has some mods too - have dropped the (pretty excessive) bias current in the output stage (idle power now ~115W down from ~170W) and put a somewhat less noisy fan in (still loud though - needs a lot of cooling).
Edit: added some pics of the box. HI jacks are surrounded by Guard potential on the inside (probably unnecessary), and there is a switch to short LO to Earth (useful when doing measurements using the triax connection on the front, removes the need to deal with the link on the rear of the machine). The PCB panel for the rear of the box extends into the case grooves to located it centrally, so the single screw is enough to hold it on (screw is some awful imperial size though, took a while to find it in my box of odds and ends).
Biggest challenge with the 228A box is finding a good Local/Remote sense switch - I'd like a pushbutton like on this unit, but I can't find something similar that's dual pole (this only needs to be single pole, but there are two sense leads requiring dual pole), any suggestions are welcome!