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# Calculating Shieldi Effectiveness with Femm

- To: femm@egroups.com
- Subject: Calculating Shieldi Effectiveness with Femm
- From: emiliano.menghi@inwind.it
- Date: Tue, 23 Jan 2001 16:52:14 -0000
- User-agent: eGroups-EW/0.82

    Hi,i use Femm to calculate the shielding effecctiveness (at 50 Hz) of
    various ferromagnetic and non-ferromangetic materials. But i've some
    problems.
    My configuration is simple: a copper conductor with 1000 A and a
    cylindrical shield.
    But Femm calculate error value for A vector.
    I used some boundary condition (A=0 and unbounded condition) but the
    problem is present.
    Infact when i calculate source impedence at distance of 20 mm (Ez/Hx)
    the excact value is 140 but Femm tell me about 30.
    Where is the problem?
    Thank you and excuse me for my poor enghish.
    By

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