The medical circumstance for many people requires that they have an implanted pacemaker/defibrillator or an implanted insulin pump. These kinds of critical equipment must not be disrupted by the operation of other electronics such as cell phones, etc.
What’s the Difference Between EMI and RFI?
The terms radio-frequency interference (RFI) and electromagnetic interference (EMI) often may be used interchangeably since radio waves are simply a subset of the electromagnetic spectrum. However, there’s actually a difference in practice.
EMI is usually characterized as any frequency of electrical noise; RFI is a specific subset of electrical noise within the EMI spectrum. RFI is classified as a disturbance that may affect an electrical circuit due to either electromagnetic conduction or electromagnetic radiation emitted from some external source.