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Active Compensation System for Electromagnetic Strayfields
           
 

IDE’s State-of-the-Art MK 4 EMI Cancellation System

   MK4 Product Brochure
  Building on its worldwide acceptance, the MK Series has been extensively upgraded with cutting-edge enhancements to its active, analog and digital controls, delivering outstanding EMI disturbance cancellation in a broadband manner for highly sensitive instruments. The MK4 incorporates IDE’s unique feedback control engineering.

The MK 4 is designed around an IDE custom-configured Helmholtz Cage of 6 sides with side lengths up to 4m.

The coils are fabricated using 26 conductor cables with solid state connector boards to connect all 6 coil pairs in series.

The standard Helmholtz configuration is 80mm square, with extruded aluminum channels, floor mounted, surrounding the instrument. (Room mounted cages are available). Once tuned, the MK4 system will adapt to environmental field change.

The MK4 has diagnostic capabilities through connections on the control panel for ease of system operation verification. It can be tuned to the specific environment using the hyperterminal of a standard laptop.
  A signal is fed through the proprietary IDE MK 4 controller to a compensation coil, producing counter-acting electro-magnetic fields.

These compensation fields create a minimized effective field at the sensor site:

  • Virtually neutralizing the original disturbance
  • Optimizing the overall operation of the sensitive equipment
  • Effectively enhancing total instrument performance
The heart of the MK 4 is IDE’s innovative, patent-pending control system - a unique hybrid of analog controls to manage high frequencies and digital controls to handle the more complex quasi-DC rejection needs.

  
  The quasi-DC disturbances that the IDE MK 4 system effectively blocks are typically rated below 20Hz.

The AC disturbances attenuated by IDE’s MK 4 EMI Cancellation System vary in a periodic or cyclical manner.

The MK4 system reduces both AC and DC electromagnetic field disturbances using a single sensor.

  • Reduces electromagnetic interference in the range of DC to 10Kz (HF version: up to 20kHz)
  • Optimal efficiency is in the DC to 100 Hz frequency spectrum
  • Reduction of these fields is >45 dB
    (0.005 factor reduction in field interference at the sensor).
  
 

Device Properties
 Control bandwidth) 0Hz....10kHz (HF version: 20kHz)
 Attenuation at 0 to 100Hz ≥45 dB
Attenuation at 100 to 1kHz ≥25 dB @ 1 kHz
Attenuation at 1kHz to 5kHz ≥10 dB
Attenuation at 5kHz to 20kHz ≥10 dB @ 9.7 kHz (HF version)
Helmholtz Cage dimensions rectangular up to 4mx4mx4m