The Magnetic Active Compensation System, MACS™ provides cost-effective, maintenance-free environmental magnetic field shielding solutions for high-resolution EM (Electron Microscope) instrumentation. They are the highest-performance commercial active magnetic field compensation equipment available for protecting sensitive EM instruments from AC/DC environmental magnetic field fluctuation. These reliable systems provide real time compensation of environmental magnetic field fluctuations caused by moving vehicles, trains, elevators, electrical distribution equipment, and other sources.

ETS-Lindgren’s MACS systems provide a uniform solution, at DC and through low frequency, using a highly sophisticated electronic magnetic compensation technology. Utilizing a patented wideband negative-feedback electronic design, the equipment deeply attenuates interfering magnetic fields at a fraction of the cost of alternative methods, such as passive shielding or equipment relocation. Field attenuation at the protected EM exceeds a factor of 30. This permits the successful operation of EMs- especially units with highly susceptible FEG emitters- at virtually any site.