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Advice on a low noise precision programmable power supply?

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tautech:

--- Quote from: rwgast_lowlevellogicdesin on July 05, 2024, 11:25:22 pm ---Is 350uV a pk to pk, or an rms measurement. Most everything I see says under 1mv rms... which doesn't always mean a lot based on how fast the peaks are.

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Both are stated on P4 in CV and CC modes:
https://int.siglent.com/u_file/download/24_06_13/SPD4000X_DataSheet_EN01A.pdf

rwgast_lowlevellogicdesin:
Ok so the 4000 looks pretty damn nice! The sheet says 5mV pk2pk ripple which is a bit more than the specs on the Keithley and measurable on a scope. The 4000s features are so much nicer than an old Kiethly though! It is a pretty PSU.

KungFuJosh:

--- Quote from: rwgast_lowlevellogicdesin on July 05, 2024, 11:25:22 pm ---The Insteks actually look pretty nice and there about the same price as the 4000x, ive been looking at some used Kiethly too. 500+ is a lot for a PSU i just dont want to hook it up and see 10mv of differential noise and common mode shit everywhere if I spend that kind of money.

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Personally, I would choose between the Instek with LAN, or the 4000X series (but pay attention to specs- one opts for lower voltage and higher current).

I don't recommend getting a used PSU. Get one with a fresh warranty.

Someone:

--- Quote from: tautech on July 05, 2024, 10:30:43 pm ---
--- Quote from: Someone on July 05, 2024, 10:24:08 pm ---
--- Quote from: rwgast_lowlevellogicdesin on July 05, 2024, 08:35:35 pm ---The problem is there is no one out there showing the ripple and common mode noise that come out of these power supplies, not even the Siglent. I dont mind buying some used Keithley or Keysight supplies, but are they any less noisy or even that much better than a newer Siglent/Rigol etc?
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Possibly not better (at some given condition, with the unit on hand), but if they provide guaranteed noise specifications then you won't get any worse than that.
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Exactly.

Siglent PSU's do clearly provide a ripple and noise spec in datasheets, generally ~350uV and just try to measure this with a scope.  :o
Not as easy as one might think.......
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Some competitors are using "typical" or "supplemental" specifications for the same, nice to see Siglent being a leader with guaranteed specs.

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