| The EMC Directive Principal EMC phenomena |
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| The EMC Directive Principal EMC phenomena |
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0.15-30MHz conducted on AC mains cables (motors, light dimmers and computers/microprocessors systems) |
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30-1,000MHz radiated (computers/microprocessors systems, vehicle ignition systems and motors) |
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0-2kHz harmonics, AC mains cable (motors, light dimmers and computers/microprocessors systems) |
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Conducted 0.15-80MHz, 1kHz 80% amplitude modulation,
3-10V (hand-held transceivers, radio transmitters, vehicle transmitters and industrial/medical equipment) |
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Radiated 80-1,000MHz, 1kHz 80% amplitude modulation,
3-10V/m (Same as Conducted 0.15-80MHz, + TV transmitters) |
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Radiated 900MHz, 200Hz pulse modulation with 50%
duty cycle, 3-10V/m (cellular telephones) |
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Power frequency magnetic fields (50Hz), 3-30A/m (currents in nearby conductors and transformers) |
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Fast transient bursts Tr/Th* = 5/50ns, on supply and
signal/control lines, ± 0.5-2.0kV (switching of small inductive loads, relay contact bounce and HV switchgear) |
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Surges Tr/Th* = 1.2/50µs voltage pulse or 8/20µs
current pulse, on supply and signal/control lines, ± 0.5-4.0kV (switching phenomena, faults and direct/indirect lightning strokes) |
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Electrostatic discharge - ESD, ±4kV contact
discharge, ±8kV air discharge (charged operator touching equipment or discharging in vicinity of equipment) |
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Mains voltage dips 30% for 10ms, 60% for 100ms (fault conditions or sudden large changes of load) |
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Mains voltage interruptions >95% for 5s (fault conditions) |
| *Tr = rise time (10%-90%), Th = half time duration (50%-50%) |
| Please note that this summary is simplified and generalised; the applicable standards need to be consulted for the applicable phenomena and test levels. |
