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Useful ferrite identification tip

Discussion in 'Electronic Design' started by Tim Williams, Nov 17, 2012.

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  1. Tim Williams

    Tim Williams Guest

    NiZn ferrites have a brown streak, MnZn black.

    To observe the streak, take a file, sandpaper, abrasive stone, etc. to the
    material and make some dust.

    NiZn ferrites have lower saturation flux density, lower permeability and
    higher frequency range than MnZn. NiZn are used for RF applications while
    MnZn are used in general purpose and power applications. Both are used in
    ferrite beads for respective bandwidths.

    Getting more specific than this, I think, involves actually measuring the
    thing. Example: a #77 ferrite inductor will have a very low Q at 10MHz,
    while a #61 will have a high Q.

  2. Fred Bartoli

    Fred Bartoli Guest

    Tim Williams a écrit :
    Use an ohmmeter, they have hugely different resistivity: 0.1-10
    ohm-meter for the MnZn and over 10^3 ohm-meter for the NiZn ones.
  3. Tim Williams

    Tim Williams Guest

    That too!

  4. Making a reliable 'connection' to them such that your reading would be
    accurate, would be fairly difficult. some of them even get coated.
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