Glossary
A
Attenuation: The decrease in intensity or absorption of electromagnetic energy. Expressed in dB
C
Capacitance: Stores electrical charge. Measured in Farads.
Conducted Interference: Electromagnetic signals entering a device through direct connection.
E
EMC: "Electromagnetic Compatibility" Equipment does not electromagnetically disturb the environment.
EMI: "Electromagnetic Interference" Emissions:The level of electromagnetic disturbances equipment causes to its environment.
Emissions Standards: -FCC 15, Subpart J (400kHz to 30MHz) Covers electronic devices unintentionally emitting RF energy
- Class A - Industrial & Commercial 60 - 70 dB
- Class B - Residential 48 dB
F
Filter: Removes electrical noise or interference from the power line by cleaning up the sine wave.
I
Immunity: The level to which equipment is immune to electromagnetic disturbances in its environment.
Impedance: Resistance to the flow of electrical current when a given voltage is applied.
Inductor: Passive component that produces a voltage proportional to the change in current. Measured in Henrys.
Insertion Loss: The electromagnetic radiation loss resulting from the insertion of a filter in a transmission line. Expressed in dB.
N
Noise: Interference
R
Radiated Interference: Radiation of electromagnetic waves scattered in the environment.
Resistance: The opposition to the flow of electricity (voltage). Measured in Ohms.
RFI: "Radio Frequency Interference"