Application to test chamber problems

EMC measurements are typically performed on an open area test site (OATS), in a screened room or in a special test cell designed to generate well defined electromagnetic waves. A screened room is a metal structure that provides high electromagnetic isolation up to high frequencies. The minimum size of enclosure that is acceptable must allow for the equipment under test (EUT), a minimum separation between the EUT and an antenna used as source or detector, and the thickness of any damping material. Small rooms might be employed to test table top equipment whereas larger rooms, with associated higher costs, may examine complete vehicles. The paper reviews, at a basic level, some electromagnetic issues underpinning test chamber measurement and principles