Years ago, I was a design engineer for a medical-imaging company producing MRI (magnetic-resonance-imaging) equipment. Even though I was not an RF engineer, the designs I worked on had to deal with RF-noise problems all the time, mainly within the shielded room where the magnet resided. My main responsibility was the patient-handling system, which accurately moves the patient to the point at which the scan will be the most effective. Because the RF coils in an MRI system are highly sensitive, no clocks or high-frequency-generating devices can be on in the room at the time of the scan. Well, as most engineers probably know, for many processors, there is a "sleep mode" that turns the clock off. The patient-handling system's processor entered sleep mode at the time of scan but kept the power on.
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