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Discussion in 'Electronic Basics' started by Plater, Jul 7, 2006.

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  1. Plater

    Plater Guest

    I have a dc power supply, that I need to know the ac ripple on the
    output. Can anyone help me out on how I do this test? The power supply
    is 230 volt 3 phase input, 0 to 15 volt DC and 0 to 1000 amps output.I
    don't know too much about this test, I have a oscilloscope, but not
    sure how to use it for this test.
    Thank you
  2. John Fields

    John Fields Guest

  3. G. Schindler

    G. Schindler Guest

    Two things ....
    First, be aware that ripple will change with load current. This may
    affect how you actually perform the test depending on what you are
    looking to find out.

    Second, are you sure that the power supply output is capable of 1000
    Amps .... or is it 1000 milliamps? If it REALLY is going to be
    providing 1000 Amps then you may have some grounding issues as well as
    some safety issues.
  4. Rick

    Rick Guest

    With "plater" for a name, an email addy of "ccchrome" , and a 230 volt 3 phase input, I'd
    say it's safe to say he means 1000A...
  5. Phil Allison

    Phil Allison Guest


    ** A 15,000 watt DC supply is no toy !!

    Surely the maker specifies the ripple percentage.

    How is the output voltage varied - with SCRs ??

    ** Just connect the scope to the output of the PSU, while in use, PLUS
    monitor the DC voltage on a normal meter.

    Then set the scope input to "AC " and adjust the vertical setting to make
    it easy to see & read the waveform.

    Ripple% = the *peak to peak* AC voltage expressed as a percentage of the
    average DC voltage.

    For a standard ( no SCRs, no filtering) 3 phase rectifier, ripple is close
    to 5%.

    ......... Phil
  6. Alan B

    Alan B Guest

    An excellent deduction, IMO.
  7. Plater

    Plater Guest

    Thanks for the help. I think I can figure it out.
    The manufactur did say it was less then 5%, but its a very old machine
    and was in a fire and completely rebuilt, so I was just wanting to test
    it to be sure it is still less then 5%.
    It has 3 motorized powerstats on the high side to to control the output
    and it does have scr's
    oh and it really does put out 1000amps , thats kinda small in the
    electroplating industry, I have larger ones.
    Thanks again
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