O.Y. Makarov, M.A. Romashchenko

Software packages for calculation of electric, magnetic and electromagnetic fields was develop for the analysis parallely with progress in computer hardware, in particular at universities and research institutes. It are a software continuously increased productivity and adapted for representation of results of the analysis in the form of computer graphics. For today well some power software packages allow to research almost all electromagnetic problems to answer specific and common questions. When reviewing such software, as the tool of the engineer on support of an EMC, it are necessary to consider the key moments. In the core, result of the modern simulation are either the color chart or a considerable quantity of values. These results should be interpret with the registration: reliability and physical correctness; possible models necessary specification. For a choice of the optimal method in article the block diagram of a choice of the appropriate numerical tool are present. Depending on analysable frequency range preferable practical application of various methods of simulation are present. Software packages accessible for calculation of electromagnetic fields and interactions was so powerful and advanced today that in the course of interpretation the user could consider that as the initial analysis the results received on the gated in data, numerically correctly. Not clear or physically senseless results could normally be a corollary of errors in the enter data or inappropriate conditions of simulation. Possible errors at input, such as, poor length of segmentation in relation to wavelength or the incorrect relation between radius of a segment and length of a cylindrical wire, was found or even was correct by the majority of software packages. When reviewing possibility usage of numerical software are result algorithm of five steps. The most important step at carrying out of the analysis are creation of model. The result of numerical modeling will be so correct, how much adequate model are used for simulation. It could be described by expression «that put, than receive». The model should describe adequately physical structure, miscalculate with usage of software provided required accuracy and finite time.