SC24 Magnetic Field Cancelling System


Electron microscopes have to operate in an ambient magnetic field comprising the earth’s field (DC magnetic fields DC Field Disturbances on Electron Microscopes and E-Beam Lithography Tools) and fields radiated by electric power networks and electrical machines (AC magnetic fields). The SC24 with DC/AC sensor is the premier magnetic field canceling system both types of fields. When the ambient field changes due to trains, elevators, trucks, metal doors, etc. (DC EMI), the electron beam deflects. This results in a loss of resolution and image distortion. The SC24 with DC/AC sensor rapidly detects field changes and dynamically creates equal and opposite fields to stabilize the image. The result is an image that is clear, stable, and free of distortion. In addition, the SC24 is equally effective in canceling AC magnetic fields from transformers, electrical wiring, and electrical equipment.


The SC24 system comprises a magnetic field control unit, one or two magnetic field sensors and three orthogonal axis multicore cables. A VEC engineer will install these cables in the room where the field is to be canceled. The SC24 can drive a single loop and double loop room size cables. It also works with Helmholtz cables that are attached to a frame around the column or a specially designed Octagon frame for optimal AC and DC field cancellation. Three power amplifiers in the control unit drive currents through the cables to create a field of the opposite sign to the change in the ambient field. The magnetic field sensor measures the resulting field and real-time negative feedback reduces the ambient field by the loop gain of the system. The system is dynamic, automatically responding to field changes within 100 µs.

SC24 Features

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Turnkey Solutions

VEC delivers turnkey solutions for vibration isolation, magnetic field cancellation, and acoustic abatement for your laboratory. You get expert guidance in product selection, transparent design, on-site installation, and post-sale support for sustained performance with us.

Product Selection

VEC reviews instrument specifications, site testing data, and facility layout to select the product most suitable for your requirements.


VEC provides design documents based on instrument footprint, product details, and project drawings to communicate the proposed solution before purchase. Seismic calculations and stamped structural drawings are available as needed.


VEC ensures production accuracy based on the design and will keep project members abreast of timelines and delivery details.

Stakeholder Coordination

VEC strives to clearly coordinate with the many project stakeholders, including architects, facilities, contractors, and equipment manufacturers.


VEC engineers will provide on-site installation services to ensure your systems' proper installation and performance. VEC provides installation reports documenting the installation and system performance.


VEC stands behind its products and performance beyond the sale and installation, and engineers are available for support as needed.

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