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6 / 22 page 14 04/00 2.2 Interference sources and disturbed equipment Interference source An interference source is an electrical device or electrical equipment which emits electromagnetic interference. We can differentiate between two main groups of interference sources corresponding to the type of frequency spectrum emitted (fig. 5). Fig. 5 Sources of interference Interference sources with discrete frequency spectra (e.g. high frequency generators and micro- processor systems) emit interference energy which is concentrated on narrow frequency bands. Switchgear and electric motors in household appliances, however, distribute their interference en- ergy over broad frequency bands and are considered to belong to the group of interference sources having a continuous frequency spectrum. µP systems Switchgear (contactors, relays) RF generators Household appliances Medical equipment Gas discharge lamps Data processing systems Power supplies and battery chargers Microwave equipment Ignition systems Ultrasonic equipment Welding apparatus RF welding apparatus Motors with brushes Radio and TV receivers Oscillating drives Switch-mode power supplies Atmospheric discharges Frequency converters UPS systems Electronic ballast circuits Interference source (emission) Discrete frequency spectrum (Sine-wave, low energy) Continuous frequency spectrum (Impulses, high energy) General Technical Information |
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