Kimmel Gerke Associates Ltd.

Saint Paul, AZ, United States

Kimmel Gerke Associates Ltd.

Saint Paul, AZ, United States

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Kimmel W.D.,Kimmel Gerke Associates Ltd. | Gerke D.D.,Kimmel Gerke Associates Ltd.
Medical Device and Diagnostic Industry | Year: 2010

Keeping several guidelines in mind can help medical device makers avoid pesky EMC problems. With many devices, particularly small ones, the design approach is straightforward, using basic EMC design practices including shielding and filtering. But with more complex equipment, it may not be possible to protect the entire system. Achieving EMC with complex systems may be not be easy, but following some basic guidelines at the front end of the design cycle eliminates many problems and minimizes the effect of those inevitable gremlins that show up downstream. The key issue in grounding is the impedance in the ground or return path. Any time two or more circuits share a ground path, they also share voltage drop along the common path. The bottom line is, ground everything as often as possible. Do not worry about ground loops. Once there is more than one ground, there is a multiple-point ground, and the only solution is to make impedance as low as possible.


Kimmel W.D.,Kimmel Gerke Associates Ltd. | Gerke D.D.,Kimmel Gerke Associates Ltd.
Medical Device and Diagnostic Industry | Year: 2011

William D. Kimmel and Daryl D. Gerke state that following several several guidelines can help medical device makers in avoiding challenging electromagnetic compatibility (EMC) problems. EMC is a major concern in medical electronics, considering that functional anomalies can be threatening for the lives of patients. Design constraints, such as leakage current limitations make the EMC design of medical electronic devices more difficult than nonmedical devices. EMC is covered by the regulatory requirements specified in the IEC 60601 standard with modifications for special cases. The standard covers immunity to external interference and emissions from within the equipment, but the primary emphasis is on immunity as it affects patient safety. Immunity requirements include external radiated electric and magnetic fields, conducted radio-frequency (RF) interference (RFI) and various power disturbances, and electrostatic discharge.

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