Nice!
-And I see that yours has two terminals with red markings for plus and minus, too. Classic.
Yeah, they seem to be a bit schizo in that regard - my older ones seem to be red-black-black, and the newer ones are red-red-black. I guess they changed the color coding because the negative isn't always tied to ground. It bothered me at first, but now I just make sure to look at the markings.
(And it seems I've been on a bit of a 'power trip' over the last year and a half or so...)
-Pat
I get that, and I understand that there are a LOT of HP instruments out there with that confusing color labeling scheme... I have the same on my 3478A, and I think it's stupid there too. I'm still trying to decide how I'm going to resolve it, though I'm leaning towards gluing Scope Probe markers or colored silicone o-rings around the jacks. I'd still prefer something more straightforward, like color coded decals for the 4-wire source terminals and the "(-)"/"LO" input terminal. No idea how I'd make those though; I don't believe my 3DPrinter will do work that fine.
Other manufacturers resolved it by using a third color to indicate the connection that was below GND, and/or by using green for GND. no idea what HP were thinking there, though. I realize these power supplies were made this way to feed TTL logic and op-amps that needed (+) & (-) power rails on top of 5-12V for the analog circuitry; so it was new territory then. But it's like they picked the worst, most confusing solution possible.
mnem
The devil on my shoulder says:
"One Word: Turnover. "