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SC22

Article: 00083680

Magnetic field cancelling system

The SC22 is a fourth generation Magnetic Field Cancelling System. It is a replacement for the SC12 system, which has an installed base of over 1000 units world wide. The system is dynamic, automatically responding to field changes within 100 µs and AC Line fields (50/60 Hz) are reduced by 50x. The SC22 does not cancel DC field changes from sources such as elevators, trains and traffic. The more powerful SC20 system is available to cancel both AC and DC fields.

The SC22 controls are much simpler than the SC12 and SC20 and are supervised by the embedded microcomputer. There are just 3 control buttons on the front panel. The units button enables choice of the displayed field units. It has no effect on field cancelling. The setup button starts a 4 second program that measures and sets the gain and phase of the feedback loop. The cancel/standby button turns cancelling on and off.
The amount by which the field is reduced is determined by the loop gain of the system, which is automatically set by the SC22 to 50 times.

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