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Electromagnetism

Handbook for EMC Testing and Measurement by David Morgan

By David Morgan

This significant reference e-book is aimed toward engineers and technical managers fascinated with EMC (electromagnetic compatibility). It explains why EMC checking out is important, what criteria has to be met, how such checking out is performed (and for this reason how you can organize for it), what accuracy and repeatability will be anticipated, and while to check. for only the price of part a day's trying out in a laboratory, with this e-book brands of apparatus can organize for and have interaction with try out homes at the foundation of sound wisdom; thereby lowering the time and rate incurred ahead of EMC approval.

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Sample text

Thus the construction of dipole antenna baluns with low leakage and good balanced transformer properties is important in minimising interactions between the antenna, cable and receiver [15-1 7]. Significant errors can be in trod uced into radiated EMI measurements by the interaction of the antenna and the ground plane at an open site or the walls of a shielded chamber. Such effects can be understood in terms of the mutual im pedance between the test antenna and the electrical images set up by the conducting planes.

FCC part 15 regulations address only emissions; however, the laws provide for susceptibility testing as well. The FCC has chosen not to mandate susceptibility or immunity limits for commercial equipment as it prefers to leave this responsibility to the manufacturer whom it supposes to have a self interest in the compatibility of its equipment with the EM environment in which it is to be operated. The FCC has five administrative arrangements for dealing with equipment that emits nonionising radiation including both intended and unintended emissions: (i) (ii) (iii) (iv) (v) Type acceptance is based on information and test data supplied by the manufacturer or licensee to the FCC, which may then choose to test the item.

I t is, however, dangerous to assume an exact read across to the US FCC standards as many detailed differences exist in test methods frequency ranges and limits. I t will be evident from comparing the two parts of the Table that there are no current equivalent FCC EMC immunity standards in the USA, though these migh t be introd uced for information technology equipment. 3 contain lists in number order of EC EN standards [16, 17] which have been referenced in the official journal of the European Communities and are therefore notified for use in the self certification route to compliance with the EC EMC directive.

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