The most basic and commonly used terms for electromagnetic compatibility issues
1. Electromagnetic environment: the sum of all electromagnetic phenomena existing in a given place;
2. Electromagnetic emission: the phenomenon that electromagnetic energy is emitted from the source;
3. Electromagnetic harassment: any electromagnetic phenomenon that may cause degradation of the performance of devices, equipment or systems or damage animate or inanimate substances;
4. Electromagnetic interference: the performance degradation of equipment, transmission channels or systems caused by electromagnetic interference;
5. Performance degradation: the undesired deviation of the working performance of the device, equipment or system from the normal performance;
6. Electromagnetic noise: a time-varying electromagnetic phenomenon that obviously does not transmit information. It may be superimposed and combined with useful signals;
7. Useless signals: signals that may damage the reception of useful signals;
8. Interference signal: damage the signal received by the useful signal;
9. Immunity to harassment: the ability of a device, equipment or system to face electromagnetic harassment without reducing its operating performance;
10. Electromagnetic susceptibility: In the presence of electromagnetic disturbance, the ability of a device, equipment or system to not avoid performance degradation;
11. Time variable level: the average value or weighted value of time variables such as power or field parameters obtained in a specified time interval in a specified way;
12. Disturbance limit: the maximum allowable level of electromagnetic disturbance corresponding to the specified measurement method;
13. Interference limit: electromagnetic disturbance reduces the maximum allowable performance of a device, equipment or system;
14. Electromagnetic compatibility: the ability of a device or system to work normally in its electromagnetic environment and does not constitute unbearable electromagnetic disturbance to anything in the environment;
15. Electromagnetic compatibility level: the maximum electromagnetic disturbance level that is expected to be imposed on devices, equipment or systems working under specified conditions;
16. The emission level of the disturbance source: the level of a given electromagnetic disturbance emitted by a specific device, equipment or system measured by a prescribed method;
17. Emission limits from disturbance sources: specify the maximum emission level of electromagnetic disturbance sources;
18. Immunity level: the maximum disturbance level when a given electromagnetic disturbance is applied to a certain device, equipment or system and it can still work normally and maintain the required performance level;
19. Immunity limit: the specified minimum immunity level;
20. Immunity margin: the difference between the immunity limit of a device, equipment or system and the electromagnetic compatibility level;
21. Electromagnetic compatibility margin: the difference between the immunity limit of the device, equipment or system and the emission limit of the disturbance source;
22. Harassment suppression: measures to weaken or eliminate electromagnetic harassment;
23. Interference suppression: measures to weaken or eliminate electromagnetic interference;
24. Emission margin: the difference between the electromagnetic compatibility level of the device, equipment or system and the emission limit;
25. Electromagnetic radiation: the phenomenon that energy is emitted from a source to space in the form of electromagnetic waves, and energy is transmitted in space in the form of electromagnetic waves;
26. Radio frequency noise: electromagnetic noise with radio frequency components;
27. Radio frequency disturbance: electromagnetic disturbance with radio frequency components;
28. Transient state: a physical quantity or physical phenomenon that changes between two adjacent stable states, the change time of which is less than the time scale of concern;
29. Pulse: A physical quantity that changes suddenly in a short period of time and then quickly returns to its initial value;
30. Impulse pulse: For a given purpose, it is similar to a unit pulse or Dirac function pulse;
31. Spike pulse: a unidirectional pulse with a short duration;
32. Pulse rise time: the time it takes for the instantaneous value of the pulse to rise from a given lower limit to a given upper limit for the first time;
33. Rising rate: The average rate of a quantity that is within the specified value range, that is, from 10% to 90% of the peak value, over time;
34. Burst pulse or oscillation: a limited number of clear pulses or an oscillation of limited duration;
35. Pulse harassment: electromagnetic harassment that appears on a certain device or equipment and is manifested as a series of clear pulses or transients;
36. Continuous noise: The effect of a particular device cannot be broken down into a series of clearly distinguishable effects;
37. Continuous noise: The effect of a particular device cannot be broken down into a string of clearly distinguishable effects;
38. Continuous disturbance: The effect of a specific device cannot be broken down into a series of clearly identifiable pulses of electromagnetic disturbance;
39. Power harassment: electromagnetic harassment transmitted to the device via the power supply line;
40. Power supply immunity: immunity to power supply disturbances;
41. Power supply decoupling coefficient: the ratio of the voltage applied to a specified position of the power supply or the voltage value applied to the specified input terminal of the device and produce the same disturbance effect on the device;
42. Shell radiation: radiation generated by the equipment shell, excluding the radiation generated by the connected antenna or cable;
43. Internal immunity: the ability of a device, equipment or system to work normally without performance degradation when there is electromagnetic disturbance at its conventional input or antenna;
44. Coupling coefficient: In a given circuit, the electromagnetic quantity is coupled from one specified position to another specified position, and the ratio of the corresponding electromagnetic quantity between the target position and the source position is the coupling coefficient;
45. Coupling path: the path through which part or all of the electromagnetic energy is transmitted from the regulation to another circuit or device;
46. Shielding: measures used to reduce field penetration to designated areas;
47. Electromagnetic shielding: Use conductive materials to reduce the shielding that the alternating electromagnetic field penetrates to the designated area;
48. Reference impedance: used to calculate or measure the electromagnetic disturbance generated by the equipment, with a specified value of impedance.
