Absorption emc meaning12/11/2023 ![]() The shield surface reflects interference energy because of the impedance discontinuity at the shield boundary. Shielding sets boundaries for radiated energy through reflection or absorption. Radiated interference is best reduced at the source by shielding. Conducted interference can be reduced by grounding back to the power supply using twisted pair wire, by using filter circuits, or by distancing the power supply line from the sources of interference. Some equipment is more prone to EMI than others. If the interference remains then it is radiated. If the interference stops then it is conducted. Conductive interference exists most often where common return circuits such as power supplies and grounds exist.Ĭonducted interference can be identified by temporarily operating the affected equipment (victim) from a separate power supply. Coupling can be either resistive, capacitive, or inductive. Conducted interference is interference that is introduced into a circuit by coupling. Radiated interference is that which is transmitted by electromagnetic fields and received by the antenna effect of other equipment. ![]() Electromagnetic interference (EMI) encompasses interference to computers and other solid-state electronics.ĮMI including radio frequency interference radiates or conducts undesirable Radio frequency interference (RFI) includes radio interference caused by electrostatic discharges (ESD) from static electricity. The by-product of producing an ignition spark is the creation of waves of electromagnetic energy within the radio frequency spectrum (above 20,000 Hz). ![]()
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