Henry Ott Consultants

Electromagnetic Compatibility Consulting and Training

Grounding of Shields

Question: We have designed a battery powered handheld amplifier circuit. To shield the amplifier circuit, we have covered the amplifier box with aluminum foil. The shield is connected to the amplifier circuit common at a single point. In all the shielding topic discussions that I have read, it is emphasised to ground the shield. Since the equipment is portable, how can it be grounded? Will the shielding be effective without the ground connection?

Answer: A shield does not have to be grounded or have its potential controlled in any way to act as an effective shield. Many shields
 are grounded for other reasons, such as electrical safety.

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Henry Ott Consultants
48 Baker Road Livingston, NJ 07039
Phone: 973-992-1793, FAX: 973-533-1442

May 21, 2009