Anti-theft devices |
Ranging from some tens of Hz to a few GHz depending on the type of system |
Induction hobs and hotplates |
20 to 50 kHz |
Electric engines and badge readers |
About 100 kHz |
Radio transmitters operated in the long wave range |
30 kHz to 300 kHz |
Welding devices |
Up to a few 100 kHz |
Induction heaters |
Some tens of Hz to some tens of kHz |
Electrosurgery systems |
Some hundred kHz |
Clinical MRI devices use intermediate frequency fields in addition to static and radio frequency fields |
Up to 10 kHz |