Interference immunity testing requirements

The more significant sources of electrical interference are outlined and the means whereby they can couple into electronic equipment and systems are described. Estimates are given of the levels of disturbance to be expected in different parts of instrumentation and control systems. Design and installation practices which need to be followed to avoid the unwanted effects of interference sources are outlined. Methods for testing units are described, followed by their extension to complete systems. Brief descriptions are given of an interference test unit for injecting interference and a pulse generator.