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Recommendation: Programmable Linear Power Supply

Discussion in 'Audio Electronics and Hardware' started by c1ferrari, Aug 9, 2017.

  1. c1ferrari

    c1ferrari Member

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    Hi all,

    I'm in the market for one of these...either new or pre-owned...preferrably 3 ch...1.5k max budget.
    Thanks.

    Hehe -- I almost left intact Poser rather than Power in the subject field
    . o_O
     
  2. amirm

    amirm Founder/Admin CFO (Chief Fun Officer) Staff Member

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    The Rigol DP800 series is the go-to brand for engineers/hobbyists these days: https://www.rigolna.com/products/dc-power-loads/dp800/

    [​IMG]

    The prices are quite reasonable in $500 to $800 range.

    There were some design issues in the first generation model (heatsink too small on one regulator) so don't get a used one.



    The down sides are fan noise, and very deep enclosure.

    I don't have one though so no personal experience.
     
  3. BE718

    BE718 Major Contributor forum experimenter

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    Last edited: Aug 9, 2017
  4. c1ferrari

    c1ferrari Member

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    Thanks, Amir -- I saw a version of this on EEVblog when he was recharging a Li-ion battery. The price is right! I think I'd rather the color version, though.
     
  5. c1ferrari

    c1ferrari Member

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  6. amirm

    amirm Founder/Admin CFO (Chief Fun Officer) Staff Member

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    The color version is harder to use because it puts the three settings for each voltage on a circle! So you can't easily associate which is which with respect to the outputs. They do have a firmware update to make it look like the green one with three vertical bars and there is a youtube on doing the upgrade. However, I heard that they may give you a hard time in giving you that firmware.
     
  7. amirm

    amirm Founder/Admin CFO (Chief Fun Officer) Staff Member

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    Keithley stuff is also highend like Keysight so I would not hesitate to use their products.
     
  8. c1ferrari

    c1ferrari Member

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    Yes, the polar-type display should give way to the three columns -- but, in color! :cool:
     
  9. amirm

    amirm Founder/Admin CFO (Chief Fun Officer) Staff Member

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    It does stay in color with the new firmware. Here is the video that that I was talking about regarding the update. It shows the color screen at the end:

     
  10. c1ferrari

    c1ferrari Member

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    I don't think Keithley garners the respect their products warrant.
    Rohde & Schwarz and Hameg may be worth it ($$$), too! :D
    My UPV needs a companion. :p
     
  11. c1ferrari

    c1ferrari Member

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    Some good vids on this Rigol, but -- GEEZ! :confused:
    Color 'Classic' display has nice appearance.
     
  12. amirm

    amirm Founder/Admin CFO (Chief Fun Officer) Staff Member

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    Yeh, I am a sucker for color too :).
     
  13. DonH56

    DonH56 Addicted to Fun and Learning Technical Expert

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    I tend to like the ones that have a button to shut down the display -- it tends to radiate noise that your cables can pick up even if it does not appear directly on the outputs. I have never used a Rigol so cannot comment but Keithley and Keysight make some really good models. There are also a number of programmable models by companies like Lambda and others that are more basic but offer good performance and some sort of serial or parallel cable (UART/RS-232/GPIB) program capability. Do check noise specs if you want a truly low-noise model, and expect to pay for it. Or build a filter of your own, usually a cheaper way. Also be wise to invest in an isolation transformer if using it for measurement purposes, but be aware higher-frequency noise will find a way and the CMRR of most devices falls off rapidly with frequency.
     
  14. c1ferrari

    c1ferrari Member

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  15. amirm

    amirm Founder/Admin CFO (Chief Fun Officer) Staff Member

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    Man, that is one cool cat! :D I am tempted and I don't even need one!!! :D :D

    They have combined their 6.5 digit meters with a power supply. Very nice idea. Then 10 na range for current is also very useful.

    Get it, then send it to me to measure the Uptone ISO Regen with it. :)
     
  16. c1ferrari

    c1ferrari Member

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    If I purchase it, Amir, I'll send it up. :cool:
    Whom would you patronize for purchase?
     
  17. amirm

    amirm Founder/Admin CFO (Chief Fun Officer) Staff Member

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    Tequipment.net is the usual place for test gear. I went there though and it says both versions of this supply are discontinued! http://www.tequipment.net/Keithley/2280S-60-3/

    Alternatively I buy through Amazon and they are stocking one unit. I would further investigate if the unit is discontinued.
     
  18. c1ferrari

    c1ferrari Member

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    Wow...first I've heard of the 2280 series being d/c'd. :eek: It appears available elsewhere, however.
    The 2280S-32-6 is listed as a current product on Keithley's w/s.
     
  19. amirm

    amirm Founder/Admin CFO (Chief Fun Officer) Staff Member

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    It is a recent product so surprising to see that. TEquipment guys are pretty good on chat. Engage them on Monday and see what the beef is and their best price. They have a discount for EEVblog members too and so just ask them about it.

    BTW, be sure the max voltage and current meet your needs.
     
  20. c1ferrari

    c1ferrari Member

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    Thanks, Amir. "Chat" via TEquipment w/s will have to compete with my students and the solar eclipse this Monday! :D
    The only other 2800-series instrument is the 2280S-60-3. Which would you get?
     

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