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Voltage "divider" after PSU to highten the resolution?

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ArthurDent:
HP made several precision bench power supplies like the Power Design one pictured above starting in the 1960s and a lot of those are still around and working just fine today. They frequently show up on eBay. Here is a picture of my HP 6111A outputting 20.00005 VDC

FriedMule:
Great idea to get a DC voltage Calibrator, I can se that the one in the picture da have 500mA.
I have looked on ebay but I cant seem to find out the max current, or if I do, they look to be max 50-100mA, and that is maybe a bit to low.
Anyone who know great DC voltage Calibrator with about 500-1,000mA?

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