TABLE OF CONTENTS Situations in which the question of electromagnetic compatibility arises invariably have two complementary aspects. Any such situation must have a source of interference emissions and a victim which is susceptible to this interference. If either of these is not present, or if there is no coupling path between them, there is no EMC problem. If both source and victim are within the same piece of equipment we have an intra-system EMC situation; if they are two different items, such as a computer monitor and a radio receiver, it is said to be an inter-system situation. The standards which were discussed in Chapter 4 were all related to controlling inter-system EMC. The same equipment may be a source in one situation and a victim in another.
Knowledge of how the source emissions are coupled to the victim is essential, since a reduction in the coupling factor is often the only way to reduce interference effects, if a product is to continue to meet its performance specification. The two aspects are frequently reciprocal, that is measures taken to improve emissions will also improve the susceptibility, though this is not invariably so. For analysis, they are more easily considered separately [103].
Systems EMC
Putting source and victim together shows the potential interference routes that exist from one to the other (Figure 10.1). When systems are being built, you need to know the emissions signature and susceptibility of the component equipment, to determine whether problems are likely to be experienced...
