Diagnosis and cure of some e.m.c. and interference immunity problems

Several recent interference investigations are described in some detail. They demonstrate that the technique of injection of radio frequency currents into the earth is effective in locating the weak points in system screens. The use of suitable cables, connectors, filters and remedial techniques can transform what appears to be in some cases a useless system into a trouble-free one. The use of a specially developed pulse generator is shown to be particularly effective when investigating problems in digital systems.