Resource Paper Describes Magnetic Field Interference With Electronic Imaging Systems
“Overview of Electron Microscope Interference” (EPRI Product 1021218).  According to this Resource Paper, it is possible to control interference from power-frequency magnetic fields to maintain sharp imaging in electron microscopes, magnetic resonance imaging systems, and nuclear magnetic resonance spectrometers.  Control methods include modifying the building electrical supply or removing magnetic field sources, employing passive shielding, and installing active field cancellation.  Users of electronic imaging systems should verify that problems are not caused by vibration before investigating magnetic field interference.  For more information, contact Gabor Mezei, (650) 855-8908, gmezei@epri.com.