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Discussion in 'Electronic Design' started by Terry Given, Mar 6, 2007.

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  1. Terry Given

    Terry Given Guest

    Hi All,

    I need to get a (cheap) 230V <= 16A LISN, to do some pre-compliance
    tests. Any ideas where? doesnt have to be new, I just dont want to have
    to roll my own.

  2. Paul Mathews

    Paul Mathews Guest

    They very occasionally turn up on auction sites and usually go for
    good money. However, making your own can be easy and quick. Try
    googling for Keith Armstrong's EMI pages, Cherry Clough Associates. He
    gives construction details for a very nice unit. Also recommended: add
    a Common Mode Diff Mode splitter, easily made from a pulse
    Paul Mathews
  3. Eeyore

    Eeyore Guest

    I did once see a circuit for one. Probably in an IEC document. It didn't look
    that tricky.

  4. Barry Lennox

    Barry Lennox Guest

    I built one from Keith Armstrong's EMI pages, I believe it's an exact
    copy out of EN 6xxxxx something. Anyway, they are pretty simple and
    it works well enough, I cannot see any difference between it's
    performance and a $$$$$ commercial unit.

  5. Terry Given

    Terry Given Guest

    Thanks for the pointers. I've been googling, but havent found the
    relevant bits yet (and my f*****g internet connection is playing up
    again). Do you have a link?

  6. Terry Given

    Terry Given Guest

  7. Terry Given

    Terry Given Guest

    Right, thats the DIY LISN built then. 30m of 4mm^2 wire cost twice as
    much as the steel enclosure, which I bought from RS!

    and FWIW I'm not making a DIY CM & DM splitter - I will use a couple of
    combiners/splitters from minicircuits:

    ZMSC-2-2 0 degrees
    ZMSCJ-2-2 180 degrees

    much better response, and they are about US$60 each.

    thanks once more for the link.

  8. Paul Mathews

    Paul Mathews Guest

    For DM/CM splitter, the first time, I used same Minicircuits modules
    you identified. Very good. 2nd time around, I used the equivalent
    Minicircuits circuit board mount modules. Same performance at about
    1/3 the cost. Third time, I used a Pulse Engrg gate drive transformer:
    slightly better performance at 1/6th the cost.
    Paul Mathews
  9. Barry Lennox

    Barry Lennox Guest

    On 15 Mar 2007 07:49:26 -0700, "Paul Mathews" <>


    If you get stuck, I have all the Cherry Clough articles on a DVD from
    one of their seminars. I can email you the article.

    Aha, Interesting, what was the part no of the PE transfomer you used?

  10. Paul Mathews

    Paul Mathews Guest


    Paul Mathews
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