Method of testing shielding effectiveness and electromagnetic field generator for use in testing shielding effectiveness

摘要

An electromagnetic field generator is provided which consists of a regulated self contained voltage supply connected to a high frequency clock which drives one or more printed circuit board antennas. The clock may be a TTL or ECL based clock for example. The electromagnetic field generator is used in a method of testing the shielding effectiveness of an enclosure. Two measurements are made with a measurement antenna of emissions from the electromagnetic field generator, one with the enclosure in place and another without the enclosure in place, the shielding effectiveness being the difference between these two measurements.