V.A. Petrov - Engineer, CJSC "Svetlana - Elektronpribor" (St.-Peterburg). E-mail: v.petrov@svetlana-ep.ru V.G. Tikhomirov - Ph.D. (Eng.), CJSC "Svetlana - Elektronpribor" (St.-Peterburg). E-mail: v11111@yandex.ru